技术领域technical field
本发明涉及电子设备设计及制造技术领域，特别涉及一种触摸屏检测设备及触控装置。The invention relates to the technical field of electronic equipment design and manufacture, in particular to a touch screen detection device and a touch control device.
背景技术Background technique
目前触摸屏的应用范围从以往的银行自动柜员机，工控计算机等小众商用市场，迅速扩展到手机，PDA(个人数字助理)，GPS(全球定位系统)，PMP(MP3，MP4等)，甚至平板电脑等大众消费电子领域。用于触摸屏具有触控操作简单、便捷、人性化的优点，因此触摸屏有望成为人机互动的最佳界面而迅速在便携式设备中得到了广泛应用。At present, the application range of touch screen has rapidly expanded from the small commercial market such as bank automatic teller machines and industrial computers to mobile phones, PDA (personal digital assistant), GPS (global positioning system), PMP (MP3, MP4, etc.), and even tablet computers. and other mass consumer electronics fields. The touch screen has the advantages of simple, convenient and humanized touch operation, so the touch screen is expected to become the best interface for human-computer interaction and has been widely used in portable devices.
电容触摸屏通常被分为自电容和互电容两类。如图1所示，为现有技术中常见的一种自电容触摸屏的结构图。该自电容触摸屏主要有双层的菱形结构感应单元100’和200’，其检测原理是对X轴和Y轴分别扫描，如果检测到某个交叉点的电容变化超出了预设范围，则将该行和列的交叉点做为触摸坐标。虽然该自电容触摸屏的线性度较好，但是经常有鬼点出现，难以实现多点触摸。此外，由于采用双层屏，也会导致结构及成本大幅增加，并且菱形结构在电容变化量很小的情况下会出现坐标飘移，受外界干扰影响大。Capacitive touch screens are generally divided into two categories: self-capacitance and mutual capacitance. As shown in FIG. 1 , it is a structure diagram of a common self-capacitance touch screen in the prior art. The self-capacitance touch screen mainly has double-layer diamond-shaped structure sensing units 100' and 200'. The detection principle is to scan the X-axis and Y-axis respectively. The intersection of the row and column is used as touch coordinates. Although the linearity of the self-capacitance touch screen is good, ghost points often appear, making it difficult to realize multi-point touch. In addition, due to the use of double-layer screens, the structure and cost will also be greatly increased, and the rhombus structure will have coordinate drift when the capacitance change is small, and it will be greatly affected by external interference.
如图2a所示，为现有技术中常见的另一种自电容触摸屏的结构图。该自电容触摸屏采用三角形图形屏结构。该自电容触摸屏包括基板300’、设置在基板300’之上的多个三角形感应单元400’、和每个三角形感应单元400’相连的多个电极500’。如图2b所示，为三角形自电容触摸屏的检测原理。如图所示，椭圆表示手指，S1、S2表示手指与两个三角形感应单元的接触面积。假设坐标原点在左下角，则横坐标X＝S2/(S1+S2)*P，其中，P为分辨率。当手指向右移动时，由于S2不是线性增大，所以X坐标存在一个偏差。从上述原理可以看出，目前的三角形感应单元是单端检测，即只从一个方向检测，然后通过算法算出两个方向的坐标。虽然该自电容触摸屏结构更为简单，但并没有针对屏幕的电容感应进行优化，电容变化量小，从而导致信噪比不够。此外，由于该感应单元为三角形，当手指横向移动时面积不是线性增大，因此线性度较差，导致了坐标计算发生偏移，线性度不够好。As shown in FIG. 2 a , it is a structure diagram of another common self-capacitance touch screen in the prior art. The self-capacitance touch screen adopts a triangular graphic screen structure. The self-capacitance touch screen includes a substrate 300', a plurality of triangular sensing units 400' disposed on the substrate 300', and a plurality of electrodes 500' connected to each triangular sensing unit 400'. As shown in Figure 2b, it is the detection principle of a triangular self-capacitance touch screen. As shown in the figure, the ellipse represents the finger, and S1 and S2 represent the contact area between the finger and the two triangular sensing units. Assuming that the coordinate origin is at the lower left corner, then the abscissa X=S2/(S1+S2)*P, where P is the resolution. When the finger moves to the right, since S2 does not increase linearly, there is a deviation in the X coordinate. It can be seen from the above principles that the current triangular sensing unit is single-ended detection, that is, it only detects from one direction, and then calculates the coordinates of the two directions through an algorithm. Although the structure of the self-capacitance touch screen is simpler, it is not optimized for the capacitive sensing of the screen, and the capacitance change is small, resulting in insufficient signal-to-noise ratio. In addition, since the sensing unit is a triangle, the area does not increase linearly when the finger moves laterally, so the linearity is poor, which leads to offset in the coordinate calculation, and the linearity is not good enough.
此外，该电容感应单元输出电容变化量很小，达到飞法级，其电缆杂散电容的存在，对测量电路提出了更高的要求。而且，杂散电容会随温度、位置、内外电场分布等诸多因素影响而变化，干扰甚至淹没被测电容信号。此外，对于单层电容来说，由于Vcom电平信号的影响会对感应电容形成严重的干扰，其中，Vcom电平信号是为了防止LCD屏幕液晶老化而不停翻转的电平信号。In addition, the output capacitance of the capacitive sensing unit varies very little, reaching the femtofarad level, and the existence of stray capacitance of the cable puts forward higher requirements for the measurement circuit. Moreover, stray capacitance will change with the influence of many factors such as temperature, location, internal and external electric field distribution, etc., which will interfere or even submerge the measured capacitance signal. In addition, for a single-layer capacitor, the influence of the Vcom level signal will cause serious interference to the sensing capacitor. The Vcom level signal is a level signal that is constantly flipped to prevent the LCD screen from aging.
发明内容Contents of the invention
本发明的目的旨在至少解决上述技术缺陷之一，特别是解决或避免出现现有自电容触摸屏中的上述缺点。The purpose of the present invention is to at least solve one of the above-mentioned technical defects, especially to solve or avoid the above-mentioned defects in the existing self-capacitance touch screen.
本发明实施例第一方面提出了一种触控装置，包括：触摸屏检测设备，所述触摸屏检测设备包括：基板；和形成在所述基板上的多个感应单元，所述多个感应单元彼此不相交，且每个所述感应单元包括：第一部分，所述第一部分的一端具有第一电极；第二部分，所述第二部分的一端与所述第一部分的另一端相连，所述第二部分的另一端具有第二电极；触摸屏控制芯片，所述触摸屏控制芯片中的一部分管脚与所述多个感应单元的第一电极相连，所述触摸屏控制芯片中的另一部分管脚与所述多个感应单元的第二电极相连，且所述触摸屏控制芯片向所述多个感应单元的第一电极和/或第二电极施加电平信号，所述电平信号在感应单元被触摸时向所述感应单元产生的自电容充电，且所述触摸屏控制芯片在检测到所述多个感应单元中一个或部分被触摸时，计算相应的感应单元中所述第一电极至所述自电容的第一电阻与所述第二电极至所述自电容的第二电阻之间的比例关系，以及根据所述比例关系及被触摸的所述感应单元计算触摸点坐标。The first aspect of the embodiments of the present invention provides a touch device, including: a touch screen detection device, the touch screen detection device includes: a substrate; and a plurality of sensing units formed on the substrate, and the plurality of sensing units are connected to each other disjoint, and each of the sensing units includes: a first part, one end of the first part has a first electrode; a second part, one end of the second part is connected to the other end of the first part, and the first part The other end of the two parts has a second electrode; a touch screen control chip, a part of the pins in the touch screen control chip are connected to the first electrodes of the plurality of sensing units, and another part of the pins in the touch screen control chip are connected to the first electrodes of the plurality of sensing units. The second electrodes of the plurality of sensing units are connected, and the touch screen control chip applies a level signal to the first electrode and/or the second electrode of the plurality of sensing units, and the level signal is when the sensing unit is touched Charge the self-capacitance generated by the sensing unit, and when the touch screen control chip detects that one or part of the plurality of sensing units is touched, calculate the self-capacitance from the first electrode in the corresponding sensing unit to the self-capacitance The proportional relationship between the first resistance and the second resistance from the second electrode to the self-capacitance, and the coordinates of the touch point are calculated according to the proportional relationship and the touched sensing unit.
本发明实施例第二方面还提出了一种触摸屏检测设备，包括：基板；和形成在所述基板上的多个感应单元，所述多个感应单元彼此不相交，且每个所述感应单元包括：第一部分，所述第一部分的一端具有第一电极；第二部分，所述第二部分的一端与所述第一部分的另一端相连，所述第二部分的另一端具有第二电极，其中，每个第一电极和第二电极均与触摸屏控制芯片的对应管脚相连。The second aspect of the embodiment of the present invention also provides a touch screen detection device, including: a substrate; and a plurality of sensing units formed on the substrate, the plurality of sensing units do not intersect each other, and each of the sensing units It includes: a first part, one end of the first part has a first electrode; a second part, one end of the second part is connected to the other end of the first part, and the other end of the second part has a second electrode, Wherein, each of the first electrode and the second electrode is connected to a corresponding pin of the touch screen control chip.
本发明实施例第三方面还提出了一种便携式电子设备，包括如上所述的触控装置。The third aspect of the embodiments of the present invention also provides a portable electronic device, including the above-mentioned touch device.
本发明实施例的触摸屏检测装置中的感应单元采用双端检测，即感应单元的两端均具有电极，且每个电极均与触摸屏控制芯片的对应管脚相连，在进行触摸检测时通过感应单元自身即可实现对触摸点的定位。The sensing unit in the touch screen detection device of the embodiment of the present invention adopts double-terminal detection, that is, both ends of the sensing unit have electrodes, and each electrode is connected to the corresponding pin of the touch screen control chip, and the sensing unit passes through the sensing unit when performing touch detection. The positioning of the touch point can be realized by itself.
本发明实施例通过对感应单元两端的电极施加电平信号，如果该感应单元被触碰，手指则会和该感应单元形成自电容，因此本发明通过施加的电平信号可对该自电容进行充电，并根据第一电阻和第二电阻之间的比例关系确定触摸位置。例如在本发明的一个实施例中，第一电阻和第二电阻之间的比例关系根据在对所述自电容充电和/或放电时，从所述第一电极和/或第二电极进行检测获得的第一检测值和第二检测值之间的比例关系计算得到。因此从第一电极和/或第二电极检测该自电容充电和/或放电时产生的第一检测值和第二检测值。这样，通过第一检测值和第二检测值就能够反应触摸点位于该感应单元的位置，从而确定触摸点在触摸屏的位置。In the embodiment of the present invention, by applying a level signal to the electrodes at both ends of the sensing unit, if the sensing unit is touched, the finger will form a self-capacitance with the sensing unit, so the present invention can adjust the self-capacitance by applying the level signal charging, and determine the touch position according to the proportional relationship between the first resistor and the second resistor. For example, in one embodiment of the present invention, the proportional relationship between the first resistance and the second resistance is based on the detection from the first electrode and/or the second electrode when charging and/or discharging the self-capacitance The obtained proportional relationship between the first detection value and the second detection value is calculated. Therefore, the first detection value and the second detection value generated when the self-capacitance is charged and/or discharged are detected from the first electrode and/or the second electrode. In this way, the position of the touch point on the sensing unit can be reflected by the first detection value and the second detection value, thereby determining the position of the touch point on the touch screen.
此外，感应单元只需要相邻的两边走线即可，不仅可以减少走线长度，而且还可以提高画线精度和减少银浆的使用，从而降低制造成本。更为重要的是，本发明通过计算第一电阻和第二电阻之间比例实现触摸位置的确定，因此相对于目前的菱形或三角形设计来说，由于在确定触摸位置时，无需计算自电容的大小，且自电容的大小不会影响触摸位置的精度，从而提高了测量精度，改善了线性度。此外，由于本发明实施例的第一部分和第二部分中任意一个均可为形状规则的矩形，因此相对于目前的菱形或三角形等不规则的形状来说，也可以进一步地提高线性度。In addition, the sensing unit only needs to be routed on two adjacent sides, which not only reduces the length of the route, but also improves the accuracy of line drawing and reduces the use of silver paste, thereby reducing manufacturing costs. More importantly, the present invention realizes the determination of the touch position by calculating the ratio between the first resistance and the second resistance. Therefore, compared with the current rhombus or triangle design, there is no need to calculate the self-capacitance when determining the touch position. The size, and the size of the self-capacitance will not affect the accuracy of the touch position, thereby improving the measurement accuracy and improving the linearity. In addition, since any one of the first part and the second part in the embodiment of the present invention can be a regular shape of a rectangle, compared with the current irregular shapes such as rhombus or triangle, the linearity can be further improved.
本发明实施例提出了一种新颖的自电容检测方式，在感应单元被触摸时，触摸点就可将该感应单元分为两个电阻，从而在进行自电容检测的同时考虑这两个电阻就可以确定触摸点在该感应单元上的位置。本发明实施例的结构简单，并且对于一个感应单元来说，可从其的第一电极和/或第二电极进行充电或放电，并在充电和/或放电时进行检测，不仅能够降低RC常数，节省时间提高效率，并且还能够保证坐标不会偏移。此外，本发明实施例还可以有效提高电路的性噪比，降低电路噪声，提高感应线性度。并且，在检测过程中由于对被触摸的感应单元进行充电，因此其中会产生小电流，能够很好地消除Vcom电平信号对触摸屏中感应单元产生的自电容的影响，因此可以相应地消除屏幕屏蔽层及相关工序，从而可以在增强了抗干扰能力的同时进一步降低成本。The embodiment of the present invention proposes a novel self-capacitance detection method. When the sensing unit is touched, the touch point can divide the sensing unit into two resistors, so that the self-capacitance detection can be considered while considering the two resistances. The position of the touch point on the sensing unit can be determined. The structure of the embodiment of the present invention is simple, and for an induction unit, it can charge or discharge from its first electrode and/or second electrode, and detect when charging and/or discharging, not only can reduce the RC constant , save time and improve efficiency, and can also ensure that the coordinates will not shift. In addition, the embodiment of the present invention can also effectively improve the S/N ratio of the circuit, reduce the circuit noise, and improve the induction linearity. Moreover, in the detection process, since the touched sensing unit is charged, a small current will be generated in it, which can well eliminate the influence of the Vcom level signal on the self-capacitance generated by the sensing unit in the touch screen, so the screen can be correspondingly eliminated. The shielding layer and related processes can further reduce the cost while enhancing the anti-interference ability.
本发明附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
附图说明Description of drawings
本发明上述的和/或附加的方面和优点从下面结合附图对实施例的描述中将变得明显和容易理解，其中：The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:
图1为现有技术中常见的一种自电容触摸屏的结构图；FIG. 1 is a structural diagram of a common self-capacitance touch screen in the prior art;
图2a为现有技术中常见的另一种自电容触摸屏的结构图；FIG. 2a is a structural diagram of another self-capacitance touch screen common in the prior art;
图2b为现有技术中常见的另一种自电容触摸屏的检测原理图；Fig. 2b is a detection principle diagram of another common self-capacitance touch screen in the prior art;
图3为本发明实施例触控装置的检测原理示意图；3 is a schematic diagram of a detection principle of a touch device according to an embodiment of the present invention;
图4a为本发明实施例触摸屏检测设备结构图；FIG. 4a is a structural diagram of a touch screen detection device according to an embodiment of the present invention;
图4b为本发明另一个实施例触摸屏检测装置结构图；Fig. 4b is a structural diagram of a touch screen detection device according to another embodiment of the present invention;
图5为本发明实施例的感应单元被触摸时的示意图；和Fig. 5 is a schematic diagram when the sensing unit of the embodiment of the present invention is touched; and
图6为本发明一个实施例的触控装置示意图。FIG. 6 is a schematic diagram of a touch device according to an embodiment of the present invention.
具体实施方式detailed description
下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本发明，而不能解释为对本发明的限制。Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
本发明实施例提出了一种新颖的自电容检测方式，在感应单元被触摸时，触摸点可以将该感应单元分为两个电阻，在进行自电容检测的同时考虑这两个电阻就可以确定触摸点在该感应单元上的位置。如图3所示，为本发明实施例触控装置的检测原理示意图。当手指触摸该感应单元时，将相当于将该感应单元分割为两个电阻，这两个电阻的阻值与触摸点的位置相关。例如，如图所述，当触摸点与第一电极较近时，则电阻R1就较小，而电阻R2就较大；反正，当触摸点与第二电极较近时，则电阻R1就较大，而电阻R2就较小。The embodiment of the present invention proposes a novel self-capacitance detection method. When the sensing unit is touched, the touch point can divide the sensing unit into two resistances, and the self-capacitance detection can be determined by considering these two resistances at the same time. The position of the touch point on the sensing unit. As shown in FIG. 3 , it is a schematic diagram of the detection principle of the touch device according to the embodiment of the present invention. When a finger touches the sensing unit, it is equivalent to dividing the sensing unit into two resistors, and the resistance of the two resistors is related to the position of the touch point. For example, as shown in the figure, when the touch point is closer to the first electrode, the resistor R1 is smaller and the resistor R2 is larger; anyway, when the touch point is closer to the second electrode, the resistor R1 is smaller Large, and the resistor R2 is small.
因此，本发明通过对电阻R1和R2的检测就可以确定触摸点在该感应单元上的位置。在本发明的实施例中，可通过多种方式检测电阻R1和R2，例如可通过检测第一电极和第二电极的电流检测值、自电容检测值、电平信号检测值和电荷变化量中的一种或多种，从而根据这些检测值获得电阻R1和R2。另外，在本发明的实施例中，检测可在充电时进行(即获得第一充电检测值和第二充电检测值)，也可在放电时进行(即获得第一放电检测值和第二放电检测值)。Therefore, the present invention can determine the position of the touch point on the sensing unit by detecting the resistors R1 and R2. In the embodiment of the present invention, the resistors R1 and R2 can be detected in various ways, for example, by detecting the current detection value of the first electrode and the second electrode, the self-capacitance detection value, the level signal detection value and the amount of charge change One or more of them, so that the resistors R1 and R2 are obtained according to these detected values. In addition, in the embodiment of the present invention, the detection can be performed during charging (that is, obtaining the first charging detection value and the second charging detection value), and can also be performed during discharging (that is, obtaining the first discharging detection value and the second discharging detection value). detection value).
此外，在充电和放电时进行的检测可以采用多种方式。但是需要说明的是，充电、放电或者检测中至少有一个步骤是对第一电极和第二电极进行的，这样才能够获得反应第一电阻和第二电阻之间差值的两个检测值，即第一检测值和第二检测值。也就是说，在充电、放电或检测时需要有电流经过第一电阻和第二电阻，这样检测到的第一检测值和第二检测值才能够反应第一电阻和第二电阻之间的差值。In addition, detection during charging and discharging can be performed in various ways. However, it should be noted that at least one step in charging, discharging or detection is performed on the first electrode and the second electrode, so that two detection values reflecting the difference between the first resistance and the second resistance can be obtained, That is, the first detected value and the second detected value. That is to say, when charging, discharging or detecting, a current needs to pass through the first resistance and the second resistance, so that the detected first detection value and the second detection value can reflect the difference between the first resistance and the second resistance value.
在本发明的实施例中，通常需要充两次电(包括同时对第一电极和第二电极充电的情况)，以及两次检测。在一些实施例中，还可能会进行两次放电。在以下的实施例中均是进行两次充电及两次检测，在以下的实施例中不再赘述。在此需要说明的是，进行两次充电及两次检测仅是本发明实施例的一种方案，算法相对比较简单。然而本领域技术人员也可根据上述思想增加充电及检测的次数，例如可进行三次充电和检测，之后根据第一次的充电检测值和第二次的充电检测值计算第一电阻，再根据第一次的充电检测值和第三次的充电检测值计算第二电阻。In the embodiment of the present invention, charging twice (including charging the first electrode and the second electrode at the same time) and detection twice are usually required. In some embodiments, two discharges may also be performed. In the following embodiments, charging and detection are performed twice, which will not be repeated in the following embodiments. It should be noted here that performing two chargings and two detections is only a scheme of the embodiment of the present invention, and the algorithm is relatively simple. However, those skilled in the art can also increase the number of times of charging and detection according to the above ideas, for example, three charging and detection can be performed, and then the first resistance is calculated according to the first charging detection value and the second charging detection value, and then according to the second charging detection value The first charge detection value and the third charge detection value are used to calculate the second resistance.
具体地，本发明包括但不限于以下几种测量方式进行检测：Specifically, the present invention includes but is not limited to the following measurement methods for detection:
1、先向感应单元的第一电极和第二电极施加电平信号以对自电容充电(如果该感应单元被触摸则就会产生自电容)；接着从第一电极和/或第二电极进行充电检测以获得第一充电检测值和第二充电检测值。在该实施例中，由于充电是从第一电极和第二电极进行的，因此对于检测来说既可以从第一电极进行检测，也可以从第二电极进行检测，或者也可从第一电极和第二电极分别进行检测。1. First apply a level signal to the first electrode and the second electrode of the sensing unit to charge the self-capacitance (if the sensing unit is touched, self-capacitance will be generated); then proceed from the first electrode and/or the second electrode Charge detection to obtain a first charge detection value and a second charge detection value. In this embodiment, since the charging is performed from the first electrode and the second electrode, the detection can be performed from the first electrode, the second electrode, or the first electrode. and the second electrode are detected separately.
还需要说明的是，在该实施例中，对第一电极和第二电极的充电可同时进行，也可分别进行，例如在第一电极和第二电极同时施加相同的电平信号以对自电容进行充电，在其他实施例中，第一电极和第二电极施加的电平信号也可以不同；或者，也可以先在第一电极上施加一个电平信号，之后再在第二电极上施加同一个电平信号或另一个电平信号。同样地，进行检测时既可以同时进行，也可分别进行。在以下实施例中，充电、放电或检测均可同时进行，或者分别进行，在此不再赘述。It should also be noted that in this embodiment, the charging of the first electrode and the second electrode can be carried out simultaneously or separately, for example, the same level signal is applied to the first electrode and the second electrode at the same time to charge the self In other embodiments, the level signals applied to the first electrode and the second electrode can also be different; or, a level signal can be applied to the first electrode first, and then applied to the second electrode The same level signal or another level signal. Likewise, detection may be performed simultaneously or separately. In the following embodiments, the charging, discharging and detection can be performed simultaneously or separately, which will not be repeated here.
2、向所述感应单元的第一电极或第二电极分别两次施加电平信号以对所述自电容进行两次充电；接着在每次充电之后从所述第一电极和/或第二电极进行充电检测以获得所述第一充电检测值和第二充电检测值。在该实施例中，由于充电是从第一电极或第二电极进行的，因此在检测时需要从第一电极和第二电极分别进行检测，其中，检测可同时进行，也可分别进行。2. Apply a level signal twice to the first electrode or the second electrode of the sensing unit to charge the self-capacitance twice; The electrodes perform charge detection to obtain the first charge detection value and the second charge detection value. In this embodiment, since the charging is performed from the first electrode or the second electrode, the detection needs to be performed separately from the first electrode and the second electrode, wherein the detection can be performed simultaneously or separately.
此外，在本发明的实施例中，还可以在第一电极进行两次充电，并从第一电极进行两次检测，或者，从第二电极进行两次充电，在第二电极进行两次检测。只要是，在两次充电时，分别将另一个电极接地或接高阻以改变另一个电极的状态。例如当向感应单元的第一电极分别两次施加电平信号以对自电容进行两次充电时，其中，两次充电中的一次将所述第二电极接地，另一次将所述第二电极接为高阻；当向感应单元的第二电极分别两次施加电平信号以对自电容进行两次充电时，两次充电中的一次将所述第一电极接地，另一次将所述第一电极接为高阻。In addition, in the embodiment of the present invention, it is also possible to charge twice at the first electrode and perform two detections from the first electrode, or to charge twice from the second electrode and perform two detections at the second electrode . As long as it is, when charging twice, the other electrode is grounded or connected to high resistance to change the state of the other electrode. For example, when a level signal is applied twice to the first electrode of the sensing unit to charge the self-capacitance twice, wherein, one of the two charges connects the second electrode to ground, and the other charges the second electrode to the ground. Connected to high resistance; when applying a level signal to the second electrode of the sensing unit twice to charge the self-capacitance twice, one of the two charges will ground the first electrode, and the other will connect the first electrode to the ground. One electrode is connected to high resistance.
这样即使是在第一电极进行了两次充电，由于第二电极状态的改变，也能够在第一电极进行两次检测，以获得能够反应第一电阻R1和第二电阻R2之间比例关系的第一检测值和第二检测值。In this way, even if the first electrode is charged twice, due to the change of the state of the second electrode, two detections can be performed on the first electrode, so as to obtain a value that can reflect the proportional relationship between the first resistance R1 and the second resistance R2. The first detection value and the second detection value.
3、向感应单元的第一电极和第二电极施加电平信号以对自电容充电；接着控制第一电极和/或第二电极接地以对自电容放电；之后从第一电极和/或第二电极进行放电检测以获得所述第一放电检测值和第二放电检测值。在该实施例中，由于对自电容充电是从第一电极和第二电极进行的，因此放电或检测就可从第一电极和/或第二电极进行。具体地，例如可同时向第一电极和第二电极施加电平信号以对自电容进行充电，或者也可不同时施加。在放电时两次放电可均将第一电极接地，或者均将第二电极接地。3. Apply a level signal to the first electrode and the second electrode of the sensing unit to charge the self-capacitance; then control the first electrode and/or the second electrode to be grounded to discharge the self-capacity; then from the first electrode and/or the second electrode The two electrodes perform discharge detection to obtain the first discharge detection value and the second discharge detection value. In this embodiment, since charging of the self-capacitance is performed from the first electrode and the second electrode, discharging or detection can be performed from the first electrode and/or the second electrode. Specifically, for example, level signals may be applied to the first electrode and the second electrode at the same time to charge the self-capacitance, or may not be applied at the same time. When discharging, the two discharges may both ground the first electrode, or both ground the second electrode.
4、向感应单元的第一电极或第二电极施加电平信号以对自电容充电；接着分别控制第一电极和第二电极接地以对自电容放电；之后分别从第一电极和/或第二电极进行放电检测以获得第一放电检测值和第二放电检测值。在该实施例中，由于对自电容放电是从第一电极和第二电极进行的，因此充电或检测就可从第一电极和/或第二电极进行。在该实施例中，两次充电也可均用第一电极，而将第二电极分别接地或接为高阻。同样地，两次充电也可均用第二电极，而将第一电极分别接地或接为高阻。4. Apply a level signal to the first electrode or the second electrode of the sensing unit to charge the self-capacitance; then respectively control the first electrode and the second electrode to be grounded to discharge the self-capacity; then respectively from the first electrode and/or the second electrode The two electrodes perform discharge detection to obtain a first discharge detection value and a second discharge detection value. In this embodiment, since the self-capacitance discharge is performed from the first electrode and the second electrode, charging or detection can be performed from the first electrode and/or the second electrode. In this embodiment, the first electrodes can also be used for both charging, and the second electrodes are respectively grounded or connected to high resistance. Similarly, the second electrode can also be used for both charging, and the first electrodes are respectively grounded or connected to high resistance.
5、向感应单元的第一电极或第二电极施加电平信号以对自电容充电；接着分别控制第一电极或第二电极接地以对自电容放电，之后分别从第一电极和第二电极进行放电检测以获得第一放电检测值和第二放电检测值。在该实施例中，由于对自电容检测是从第一电极和第二电极进行的，因此充电或放电就可从第一电极和/或第二电极进行。在该实施例中，两次充电也可均用第一电极，而将第二电极分别接地或接为高阻。同样地，两次充电也可均用第二电极，而将第一电极分别接地或接为高阻。5. Apply a level signal to the first electrode or the second electrode of the sensing unit to charge the self-capacitance; then respectively control the first electrode or the second electrode to be grounded to discharge the self-capacity, and then respectively from the first electrode and the second electrode A discharge detection is performed to obtain a first discharge detection value and a second discharge detection value. In this embodiment, since the self-capacitance detection is performed from the first electrode and the second electrode, charging or discharging can be performed from the first electrode and/or the second electrode. In this embodiment, the first electrodes can also be used for both charging, and the second electrodes are respectively grounded or connected to high resistance. Similarly, the second electrode can also be used for both charging, and the first electrodes are respectively grounded or connected to high resistance.
或者，在上述实施例的基础之上，还可以在充电时进行一次检测以获得第一充电检测值，在放电时进行第二次检测以获得第二放电检测值，再根据第一充电检测值和第二放电检测值获得第一电阻和第二电阻之间的比例关系。Or, on the basis of the above-mentioned embodiments, it is also possible to perform a detection during charging to obtain the first detection value of charging, and perform a second detection during discharge to obtain the second detection value of discharge, and then according to the first detection value of charging and the second discharge detection value to obtain a proportional relationship between the first resistance and the second resistance.
需要说明的是，在本发明的实施例中，上述第一电极和第二电极的功能相同，且二者可以互换，因此在上述实施例中，既可以从第一电极检测也可以从第二电极检测，只要能满足在充电、放电或检测时需要有电流经过第一电阻和第二电阻这一要求即可。It should be noted that, in the embodiment of the present invention, the functions of the above-mentioned first electrode and the second electrode are the same, and the two can be interchanged. The two-electrode detection only needs to satisfy the requirement that a current needs to pass through the first resistance and the second resistance during charging, discharging or detection.
从上述描述中可以看出，对于本发明的上述充电及检测方式有很多种变化，但本发明的核心就是根据第一电阻和第二电阻之间的关系，例如比例关系或者其他关系来确定触摸点的位置。进一步地，该第一电阻和第二电阻之间的关系需要通过自电容的充电和/或放电来检测。如果感应单元没有被触摸，则就不会与手产生自电容，因此检测到自电容的数据会很小，不满足触摸的判断条件，对于此本发明实施例中会不断扫描，等待手指触摸到感应单元之后才开始计算，在此不再赘述。It can be seen from the above description that there are many changes to the above-mentioned charging and detection methods of the present invention, but the core of the present invention is to determine the touch resistance according to the relationship between the first resistance and the second resistance, such as a proportional relationship or other relationships. point location. Further, the relationship between the first resistance and the second resistance needs to be detected through charging and/or discharging of the self-capacitance. If the sensing unit is not touched, self-capacitance will not be generated with the hand, so the data detected from the self-capacitance will be very small, which does not meet the judgment conditions of touch. For this embodiment of the present invention, it will continue to scan, waiting for the finger to touch The sensing unit starts to calculate afterward, and details will not be repeated here.
在本发明的实施例中，可以以扫描的方式依次向多个感应单元施加相应的电压，同时在检测时也可以以扫描的方式依次进行检测。In the embodiment of the present invention, corresponding voltages can be applied to the plurality of sensing units sequentially in a scanning manner, and detection can also be performed sequentially in a scanning manner during detection.
另外还需要说明的是，上述检测方式仅为本发明的一些优选方式，本领域技术人员还可根据上述思想进行扩展或修改，这些均应包含在本发明的保护范围之内。In addition, it should be noted that the above detection methods are only some preferred methods of the present invention, and those skilled in the art can also make extensions or modifications based on the above ideas, and these should be included in the protection scope of the present invention.
如图4a所示，为本发明实施例触摸屏检测设备结构图。该触控装置包括基板100、多个不相交的感应单元200，且多个感应单元200的每个均具有第一电极210和第二电极220。在本发明的实施例中，基板100可为单层基板。其中，在本发明的一个实施例中，多个感应单元的长度逐渐增加，且每个所述感应单元包括第一部分230和第二部分240。第一部分230的一端具有第一电极210，第二部分240的一端与第一部分230的另一端相连，且第二部分240的另一端具有第二电极220。As shown in FIG. 4a, it is a structural diagram of a touch screen detection device according to an embodiment of the present invention. The touch device includes a substrate 100 , a plurality of disjoint sensing units 200 , and each of the plurality of sensing units 200 has a first electrode 210 and a second electrode 220 . In an embodiment of the present invention, the substrate 100 may be a single-layer substrate. Wherein, in one embodiment of the present invention, the lengths of the plurality of sensing units gradually increase, and each sensing unit includes a first portion 230 and a second portion 240 . One end of the first part 230 has the first electrode 210 , one end of the second part 240 is connected to the other end of the first part 230 , and the other end of the second part 240 has the second electrode 220 .
具体地，第一部分230与基板100的第一边110平行，第二部分240与基板100的第二边120平行，且第一边110和第二边120相邻。且每个第一电极210和第二电极220均与触摸屏控制芯片的对应管脚相连。Specifically, the first portion 230 is parallel to the first side 110 of the substrate 100 , the second portion 240 is parallel to the second side 120 of the substrate 100 , and the first side 110 and the second side 120 are adjacent. And each of the first electrode 210 and the second electrode 220 is connected to a corresponding pin of the touch screen control chip.
在本发明的优选实施例中，每个感应单元200的第一部分230与其他感应单元200的第一部分230平行，每个感应单元200的第二部分240与其他感应单元200的第二部分240平行。通过这样的设置能够有效地提高感应单元对触摸屏的覆盖率。在本发明的一个实施例中，感应单元200的第一部分230、第二部分240中至少一个为矩形，优选地，第一部分230、第二部分240均为矩形。在该实施例中，由于矩形结构图形规则，因此在手指横向或纵向移动时线性度好，此外，两个矩形结构之间的间距相同，便于计算。In a preferred embodiment of the present invention, the first part 230 of each sensing unit 200 is parallel to the first part 230 of other sensing units 200, and the second part 240 of each sensing unit 200 is parallel to the second part 240 of other sensing units 200 . Such an arrangement can effectively improve the coverage of the sensing unit on the touch screen. In an embodiment of the present invention, at least one of the first part 230 and the second part 240 of the sensing unit 200 is rectangular, preferably, both the first part 230 and the second part 240 are rectangular. In this embodiment, due to the regular pattern of the rectangular structure, the linearity is good when the finger moves horizontally or vertically. In addition, the distance between the two rectangular structures is the same, which is convenient for calculation.
本发明实施例的触摸屏检测装置中的感应单元采用双端检测，即感应单元的两端均具有电极，且每个电极均与触摸屏控制芯片的对应管脚相连，在进行触摸检测时通过感应单元自身即可实现对触摸点的定位。The sensing unit in the touch screen detection device of the embodiment of the present invention adopts double-terminal detection, that is, both ends of the sensing unit have electrodes, and each electrode is connected to the corresponding pin of the touch screen control chip, and the sensing unit passes through the sensing unit when performing touch detection. The positioning of the touch point can be realized by itself.
更为重要的是，本发明通过计算第一电阻和第二电阻之间比例实现触摸位置的确定，因此相对于目前的菱形或三角形设计来说，由于在确定触摸位置时，无需计算自电容的大小，且自电容的大小不会影响触摸位置的精度，对自电容检测精度的依赖降低，从而提高了测量精度，改善了线性度。此外，由于本发明实施例的第一部分、第二部分中任意一个均可为形状规则的矩形，因此相对于目前的菱形或三角形等不规则的形状来说，也可以进一步地提高线性度。More importantly, the present invention realizes the determination of the touch position by calculating the ratio between the first resistance and the second resistance. Therefore, compared with the current rhombus or triangle design, there is no need to calculate the self-capacitance when determining the touch position. The size, and the size of the self-capacitance will not affect the accuracy of the touch position, and the dependence on the detection accuracy of the self-capacitance is reduced, thereby improving the measurement accuracy and improving the linearity. In addition, since any one of the first part and the second part in the embodiment of the present invention can be a regular shape of a rectangle, compared with the current irregular shapes such as rhombus or triangle, the linearity can be further improved.
在本发明的一个实施例中，每个感应单元的第一部分与第二部分长度相等，从而能够提高运算速度。优选地，基板100为矩形，第一边110和第二边120之间相互垂直。第一边110和第二边120相互垂直，不仅使得感应单元设计更加规则，例如使得感应单元的第一部分230和第二部分240之间也相互垂直，从而提高对触摸屏的覆盖率，而且第一部分230和第二部分240之间相互垂直也可以提高检测的线性度。In an embodiment of the present invention, the length of the first part and the second part of each sensing unit are equal, so that the operation speed can be improved. Preferably, the substrate 100 is rectangular, and the first side 110 and the second side 120 are perpendicular to each other. The first side 110 and the second side 120 are perpendicular to each other, which not only makes the design of the sensing unit more regular, for example, the first part 230 and the second part 240 of the sensing unit are also perpendicular to each other, thereby improving the coverage of the touch screen, and the first part 230 and the second portion 240 being perpendicular to each other can also improve the linearity of detection.
在本发明的一个实施例中，相邻两个感应单元200之间的间距相等。这样就可以通过多个感应单元200对触摸屏的第一边110和第二边120均匀划分，从而提高运算速度。In an embodiment of the present invention, the distance between two adjacent sensing units 200 is equal. In this way, the first side 110 and the second side 120 of the touch screen can be evenly divided by the plurality of sensing units 200, thereby improving the operation speed.
当然在本发明的另一个实施例中，相邻两个感应单元200之间的间距也可以不等，如图4b所示，例如由于用户往往触摸触摸屏的中心部位，因此可以将触摸屏中心部位的感应单元之间的间距减小，从而提高中心部位的检测精度。Of course, in another embodiment of the present invention, the distance between two adjacent sensing units 200 can also be different, as shown in Figure 4b, for example, since users often touch the center of the touch screen, the The distance between the sensing units is reduced, thereby improving the detection accuracy of the central part.
在本发明的一个实施例中，多个感应单元200位于同一层，因此只需要一层ITO即可，从而在保证精度的同时，极大地降低制造成本。In an embodiment of the present invention, multiple sensing units 200 are located on the same layer, so only one layer of ITO is required, thereby greatly reducing manufacturing costs while ensuring accuracy.
如图4a所示。在该实施例中，感应单元200的第一电极210位于基板100的第一边110上，第二电极220位于基板100的第二边120上，且第一边110和第二边120相互垂直。在该实施例中，检测到在感应单元上的触摸位置之后，即可获得在触摸屏之上的触摸位置。As shown in Figure 4a. In this embodiment, the first electrode 210 of the sensing unit 200 is located on the first side 110 of the substrate 100, the second electrode 220 is located on the second side 120 of the substrate 100, and the first side 110 and the second side 120 are perpendicular to each other. . In this embodiment, after the touch position on the sensing unit is detected, the touch position on the touch screen can be obtained.
如图5所示，为本发明实施例的感应单元被触摸时的示意图。从图5可知，第一电极为210，第二电极为220，触摸位置接近于第二电极220，假设感应单元的长度为10个单位长度，且将感应单元均匀地分为10份，其中，感应单元第一部分230的长度为5个单位长度，感应单元第二部分240的长度为5个单位长度。经过检测，获知第一电阻和第二电阻之比为9∶1，即第一电极210至触摸位置的长度(由第一电阻体现)为全部感应单元长度的90％。换句话说，触摸点位于距离第一电极210处9个单位长度的位置，获知，触摸点位于距离第二电极220处1个单位长度的位置。As shown in FIG. 5 , it is a schematic diagram when the sensing unit of the embodiment of the present invention is touched. It can be seen from FIG. 5 that the first electrode is 210, the second electrode is 220, and the touch position is close to the second electrode 220. Assume that the length of the sensing unit is 10 unit lengths, and the sensing unit is evenly divided into 10 parts. Among them, The length of the first part 230 of the sensing unit is 5 unit lengths, and the length of the second part 240 of the sensing unit is 5 unit lengths. After testing, it is known that the ratio of the first resistor to the second resistor is 9:1, that is, the length from the first electrode 210 to the touch position (represented by the first resistor) is 90% of the length of the entire sensing unit. In other words, the touch point is located at a position of 9 unit lengths away from the first electrode 210 , and it is known that the touch point is located at a position of 1 unit length away from the second electrode 220 .
从图5的以上例子可以看出，本发明的计算方式非常简单，因此能够极大地提高触摸屏检测的反应速度。It can be seen from the above example in FIG. 5 that the calculation method of the present invention is very simple, so the reaction speed of touch screen detection can be greatly improved.
如图6所示，为本发明一个实施例的触控装置示意图。该触控装置包括由基板100和多个不相交的感应单元200所构成的触摸屏检测设备300、触摸屏控制芯片400。其中，触摸屏控制芯片400中的一部分管脚与多个感应单元200的第一电极210相连，触摸屏控制芯片400中的另一部分管脚与多个感应单元200的第二电极220相连。触摸屏控制芯片400向多个感应单元200的第一电极210和/或第二电极220施加电平信号，该电平信号在感应单元200被触摸时向感应单元200产生的自电容充电，且触摸屏控制芯片400在检测到多个感应单元中一个或部分被触摸时，计算相应的感应单元中第一电极至自电容的第一电阻与第二电极至自电容的第二电阻之间的比例关系，以及根据所述比例关系及被触摸的所述感应单元计算触摸点坐标。同样地，该充电、放电和检测可同时进行也可分别进行，在此不再赘述。例如，参照图5所示，最外侧的感应单元被触摸，且触摸屏控制芯片400获得了最外侧感应单元的第一电阻和第二电阻的比例关系，由于最外侧感应单元的位置信息已存储在触摸屏控制芯片400中，当然也可存储在外接的存储器中，因此触摸屏控制芯片400就可以依据该比例关系查找最外侧感应单元的位置信息，从而确定触摸点坐标。As shown in FIG. 6 , it is a schematic diagram of a touch device according to an embodiment of the present invention. The touch control device includes a touch screen detection device 300 and a touch screen control chip 400 composed of a substrate 100 and a plurality of disjoint sensing units 200 . Wherein, some pins of the touch screen control chip 400 are connected to the first electrodes 210 of the plurality of sensing units 200 , and another part of pins of the touch screen control chip 400 are connected to the second electrodes 220 of the plurality of sensing units 200 . The touch screen control chip 400 applies a level signal to the first electrode 210 and/or the second electrode 220 of the plurality of sensing units 200, and the level signal charges the self-capacitance generated by the sensing unit 200 when the sensing unit 200 is touched, and the touch screen When the control chip 400 detects that one or part of the multiple sensing units is touched, it calculates the proportional relationship between the first resistance from the first electrode to the self-capacitance and the second resistance from the second electrode to the self-capacitance in the corresponding sensing unit , and calculate the touch point coordinates according to the proportional relationship and the touched sensing unit. Likewise, the charging, discharging and detection can be performed simultaneously or separately, which will not be repeated here. For example, as shown in FIG. 5 , the outermost sensing unit is touched, and the touch screen control chip 400 has obtained the proportional relationship between the first resistance and the second resistance of the outermost sensing unit, since the position information of the outermost sensing unit has been stored in Of course, the touch screen control chip 400 can also be stored in an external memory, so the touch screen control chip 400 can search the position information of the outermost sensing unit according to this proportional relationship, so as to determine the coordinates of the touch point.
在本发明的实施例中，通常手指或其他物体会触摸多个感应单元，此时触摸屏控制芯片400可以先获得在这被触摸的多个感应单元中每个的触摸位置，然后通过求平均的方式计算最终在触摸屏上的触摸位置。另外，第一检测值和第二检测值可为电流检测值、自电容检测值、电平信号检测值和电荷变化量中的一种或多种，只要能反应第一电阻和第二电阻之间的差值即可。在本发明的一个实施例中，触摸屏控制芯片400之中包括两个电容检测模块CTS以同时从第一电极210和第二电极220对感应单元200进行检测。由于这两个电容检测模块CTS可以共用一些器件，因此也不会增加芯片的整体功耗。In the embodiment of the present invention, usually fingers or other objects will touch multiple sensing units, at this time the touch screen control chip 400 can first obtain the touch position of each of the multiple sensing units touched here, and then use the averaged method to calculate the final touch position on the touch screen. In addition, the first detection value and the second detection value can be one or more of current detection value, self-capacitance detection value, level signal detection value and charge change, as long as it can reflect the difference between the first resistance and the second resistance. The difference between . In one embodiment of the present invention, the touch screen control chip 400 includes two capacitance detection modules CTS to detect the sensing unit 200 from the first electrode 210 and the second electrode 220 at the same time. Since the two capacitance detection modules CTS can share some components, the overall power consumption of the chip will not be increased.
在本发明的另一个实施例中，也可仅采用一个自电容触摸屏控制芯片400依次从第一电极210和第二电极220对感应单元200进行检测。触摸屏控制芯片400根据第一电阻和第二电阻之间的比例关系确定触摸位置。In another embodiment of the present invention, only one self-capacitance touch screen control chip 400 may be used to sequentially detect the sensing unit 200 from the first electrode 210 and the second electrode 220 . The touch screen control chip 400 determines the touch position according to the proportional relationship between the first resistance and the second resistance.
在本发明的一个实施例中，第一电阻和第二电阻之间的比例关系根据在对自电容充电和/或放电时，从第一电极和/或第二电极进行检测获得的第一检测值和第二检测值之间的比例关系计算得到。In one embodiment of the present invention, the proportional relationship between the first resistance and the second resistance is based on the first detection obtained from the detection of the first electrode and/or the second electrode when the self-capacitance is charged and/or discharged. The proportional relationship between the value and the second detection value is calculated.
在本发明的一个实施例中，第一检测值和第二检测值为电流检测值、自电容检测值、电平信号检测值和电荷变化量中的一种或多种。In an embodiment of the present invention, the first detection value and the second detection value are one or more of a current detection value, a self-capacitance detection value, a level signal detection value, and a charge variation.
在本发明的一个实施例中，第一检测值包括第一充电检测值或第一放电检测值，所述第二检测值包括第二充电检测值或第二放电检测值。In an embodiment of the present invention, the first detection value includes a first detection value of charge or a first detection value of discharge, and the second detection value includes a second detection value of charge or a second detection value of discharge.
在本发明的一个实施例中，触摸屏控制芯片400向感应单元200的第一电极210和第二电极220施加电平信号以对自电容充电，触摸屏控制芯片400从第一电极210和/或第二电极220进行充电检测以获得第一充电检测值和第二充电检测值。In one embodiment of the present invention, the touch screen control chip 400 applies a level signal to the first electrode 210 and the second electrode 220 of the sensing unit 200 to charge the self-capacitance, and the touch screen control chip 400 receives from the first electrode 210 and/or the second electrode 220 The two electrodes 220 perform charge detection to obtain a first charge detection value and a second charge detection value.
在本发明的一个实施例中，触摸屏控制芯片400向感应单元200的第一电极210或第二电极220分别两次施加电平信号以对自电容进行两次充电，在每次充电之后触摸屏控制芯片400从第一电极210和/或第二电极220进行充电检测以获得第一充电检测值和第二充电检测值。In one embodiment of the present invention, the touch screen control chip 400 applies a level signal to the first electrode 210 or the second electrode 220 of the sensing unit 200 respectively twice to charge the self-capacitance twice, and the touch screen controls The chip 400 performs charge detection from the first electrode 210 and/or the second electrode 220 to obtain a first charge detection value and a second charge detection value.
在本发明的一个实施例中，当触摸屏控制芯片400向感应单元200的第一电极210分别两次施加电平信号以对自电容进行两次充电时，两次充电中的一次将第二电极220接地，另一次将第二电极220接为高阻；或者，当触摸屏控制芯片400向感应单元200的第二电极220分别两次施加电平信号以对自电容进行两次充电时，两次充电中的一次将第一电极210接地，另一次将第一电极210接为高阻。In one embodiment of the present invention, when the touch screen control chip 400 applies a level signal to the first electrode 210 of the sensing unit 200 twice to charge the self-capacitance twice, one of the two charges charges the second electrode 220 is grounded, and the second electrode 220 is connected to high resistance for another time; or, when the touch screen control chip 400 applies a level signal to the second electrode 220 of the sensing unit 200 twice to charge the self-capacitance twice, twice In one charge, the first electrode 210 is grounded, and in the other charge, the first electrode 210 is connected to high resistance.
在本发明的一个实施例中，触摸屏控制芯片400向感应单元200的第一电极210和第二电极220施加电平信号以对自电容充电，触摸屏控制芯片400控制第一电极210和/或第二电极220接地以对自电容放电，触摸屏控制芯片400从第一电极210和/或第二电极220进行放电检测以获得所述第一放电检测值和第二放电检测值。In one embodiment of the present invention, the touch screen control chip 400 applies a level signal to the first electrode 210 and the second electrode 220 of the sensing unit 200 to charge the self-capacitance, and the touch screen control chip 400 controls the first electrode 210 and/or the second electrode 220 to charge the self-capacitance. The second electrode 220 is grounded to discharge the self-capacitance, and the touch screen control chip 400 detects the discharge from the first electrode 210 and/or the second electrode 220 to obtain the first discharge detection value and the second discharge detection value.
在本发明的一个实施例中，触摸屏控制芯片400向感应单元200的第一电极210或第二电极220施加电平信号以对自电容充电，触摸屏控制芯片400分别控制第一电极210和第二电极220接地以对自电容放电，触摸屏控制芯片400分别从第一电极210和/或第二电极220进行放电检测以获得第一放电检测值和第二放电检测值。In one embodiment of the present invention, the touch screen control chip 400 applies a level signal to the first electrode 210 or the second electrode 220 of the sensing unit 200 to charge the self-capacitance, and the touch screen control chip 400 controls the first electrode 210 and the second electrode 220 respectively. The electrode 220 is grounded to discharge the self-capacitance, and the touch screen control chip 400 performs discharge detection from the first electrode 210 and/or the second electrode 220 to obtain a first discharge detection value and a second discharge detection value.
在本发明的一个实施例中，触摸屏控制芯片400向感应单元200的第一电极210或第二电极220施加电平信号以对自电容充电，触摸屏控制芯片400分别控制第一电极210或第二电极220接地以对自电容放电，触摸屏控制芯片400分别从第一电极210和第二电极220进行放电检测以获得第一放电检测值和第二放电检测值。In one embodiment of the present invention, the touch screen control chip 400 applies a level signal to the first electrode 210 or the second electrode 220 of the sensing unit 200 to charge the self-capacitance, and the touch screen control chip 400 respectively controls the first electrode 210 or the second electrode 220 The electrode 220 is grounded to discharge the self-capacitance, and the touch screen control chip 400 performs discharge detection from the first electrode 210 and the second electrode 220 respectively to obtain a first discharge detection value and a second discharge detection value.
在本发明的一个实施例中，触摸屏控制芯片400包括一个或两个CTS(电容检测模块)。In one embodiment of the present invention, the touch screen control chip 400 includes one or two CTS (capacitance detection module).
本发明实施例通过对感应单元两端的电极施加电平信号，如果该感应单元被触碰，手指则会和该感应单元形成自电容，因此本发明通过施加的电平信号可对该自电容进行充电，并根据第一电阻和第二电阻之间的比例关系确定触摸位置。例如在本发明的一个实施例中，第一电阻和第二电阻之间的比例关系根据在对所述自电容充电和/或放电时，从所述第一电极和/或第二电极进行检测获得的第一检测值和第二检测值之间的比例关系计算得到。因此从第一电极和/或第二电极检测该自电容充电和/或放电时产生的第一检测值和第二检测值。这样，通过第一检测值和第二检测值就能够反应触摸点位于该感应单元的位置，从而确定触摸点在触摸屏的位置。In the embodiment of the present invention, by applying a level signal to the electrodes at both ends of the sensing unit, if the sensing unit is touched, the finger will form a self-capacitance with the sensing unit, so the present invention can adjust the self-capacitance by applying the level signal charging, and determine the touch position according to the proportional relationship between the first resistor and the second resistor. For example, in one embodiment of the present invention, the proportional relationship between the first resistance and the second resistance is based on the detection from the first electrode and/or the second electrode when charging and/or discharging the self-capacitance The obtained proportional relationship between the first detection value and the second detection value is calculated. Therefore, the first detection value and the second detection value generated when the self-capacitance is charged and/or discharged are detected from the first electrode and/or the second electrode. In this way, the position of the touch point on the sensing unit can be reflected by the first detection value and the second detection value, thereby determining the position of the touch point on the touch screen.
此外，感应单元只需要相邻的两边走线即可，不仅可以减少走线长度，而且还可以提高画线精度和减少银浆的使用，从而降低制造成本。更为重要的是，相对于目前的菱形或三角形设计，可以极大地提高线性度，从而提高检测精度。In addition, the sensing unit only needs to be routed on two adjacent sides, which not only reduces the length of the route, but also improves the accuracy of line drawing and reduces the use of silver paste, thereby reducing manufacturing costs. More importantly, compared with the current rhombus or triangle design, the linearity can be greatly improved, thereby improving the detection accuracy.
本发明实施例提出了一种新颖的自电容检测方式，在感应单元被触摸时，触摸点就可将该感应单元分为两个电阻，从而在进行自电容检测的同时考虑这两个电阻就可以确定触摸点在该感应单元上的位置。本发明实施例的结构简单，并且对于一个感应单元来说，可从其的第一电极和/或第二电极进行充电或放电，并在充电和/或放电时进行检测，不仅能够降低RC常数，节省时间提高效率，并且还能够保证坐标不会偏移。此外，本发明实施例还可以有效提高电路的性噪比，降低电路噪声，提高感应线性度。并且，在检测过程中由于对被触摸的感应单元进行充电，因此其中会产生小电流，能够很好地消除Vcom电平信号对触摸屏中感应单元产生的自电容的影响，因此可以相应地消除屏幕屏蔽层及相关工序，从而可以在增强了抗干扰能力的同时进一步降低成本。The embodiment of the present invention proposes a novel self-capacitance detection method. When the sensing unit is touched, the touch point can divide the sensing unit into two resistors, so that the self-capacitance detection can be considered while considering the two resistances. The position of the touch point on the sensing unit can be determined. The structure of the embodiment of the present invention is simple, and for an induction unit, it can charge or discharge from its first electrode and/or second electrode, and detect when charging and/or discharging, not only can reduce the RC constant , save time and improve efficiency, and can also ensure that the coordinates will not shift. In addition, the embodiment of the present invention can also effectively improve the S/N ratio of the circuit, reduce the circuit noise, and improve the induction linearity. Moreover, in the detection process, since the touched sensing unit is charged, a small current will be generated in it, which can well eliminate the influence of the Vcom level signal on the self-capacitance generated by the sensing unit in the touch screen, so the screen can be correspondingly eliminated. The shielding layer and related processes can further reduce the cost while enhancing the anti-interference ability.
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
尽管已经示出和描述了本发明的实施例，对于本领域的普通技术人员而言，可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型，本发明的范围由所附权利要求及其等同限定。Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.
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| TW101213750UTWM449305U (en) | 2011-07-26 | 2012-07-17 | Touch screen detecting apparatus, touch sensitive device, and portable electronic apparatus |
| TW101125694ATWI475437B (en) | 2011-07-26 | 2012-07-17 | Touch screen detecting apparatus, touch sensitive device, and portable electronic apparatus |
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| CN2011102109594 | 2011-07-26 | ||
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| CN201110459466.4ACN102902437B (en) | 2011-07-26 | 2011-12-31 | Touch-screen testing equipment and contactor control device |
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| CN102902437A CN102902437A (en) | 2013-01-30 |
| CN102902437Btrue CN102902437B (en) | 2016-04-27 |
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| CP01 | Change in the name or title of a patent holder | Address after:518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after:BYD Semiconductor Co.,Ltd. Address before:518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before:BYD Semiconductor Co.,Ltd. Address after:518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after:BYD Semiconductor Co.,Ltd. Address before:518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before:SHENZHEN BYD MICROELECTRONICS Co.,Ltd. | |
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