CN103294286A - Method for touching screen with display panel and relevant device - Google Patents

Abstract

Translated fromChinese

本发明提供一种以显示面板实现触控屏幕的方法与相关装置。可利用显示面板中各源极导线与栅极导线的跨越处来感测使用者的触控。在进行触控感测的感测阶段中，经由各源极导线来感测各跨越处因触控而引发的电容改变；在显示阶段中，则由各源极导线传输驱动电力以驱动显示面板进行显示。

The invention provides a method and a related device for realizing a touch screen with a display panel. The crossover of each source wire and gate wire in the display panel can be used to sense the user's touch. In the sensing stage of touch sensing, the capacitance change caused by touch at each crossing is sensed through each source wire; in the display stage, the driving power is transmitted by each source wire to drive the display panel to display.

Description

Translated fromChinese

以显示面板实现触控屏幕的方法与相关装置Method and related device for realizing touch screen with display panel

技术领域technical field

本发明有关一种以显示面板实现触控屏幕的方法与相关装置，尤指一种能利用显示面板既有构造实现低成本整合式触控屏幕的方法与相关装置。The present invention relates to a method and a related device for realizing a touch screen by using a display panel, in particular to a method and a related device for realizing a low-cost integrated touch screen by utilizing the existing structure of the display panel.

背景技术Background technique

触控屏幕结合影像资讯的展示功能与感测触控的触控功能，是现代资讯社会最重要的人机介面之一。如何以低成本实现触控屏幕，也成为现代电子厂商的研发重点。The touch screen is one of the most important human-machine interfaces in the modern information society, combining the display function of image information and the touch function of sensing touch. How to realize the touch screen at low cost has also become the research and development focus of modern electronic manufacturers.

发明内容Contents of the invention

为降低触控屏幕的成本，本发明提供一种能利用显示面板既有构造实现触控屏幕的方法与相关装置。In order to reduce the cost of the touch screen, the present invention provides a method and a related device capable of utilizing the existing structure of the display panel to realize the touch screen.

发明揭示一种显示面板，设有多个第一导线S(j)、多第二个导线G(i)与多个显示单元D(i，j)，各显示单元D(i，j)耦接于对应的第一导线S(j)与第二导线G(i)。各第一导线S(j)与各第二导线G(i)相互绝缘并在一对应的跨越处Z(i，j)彼此跨越。The invention discloses a display panel, which is provided with a plurality of first wires S(j), a plurality of second wires G(i) and a plurality of display units D(i, j), and each display unit D(i, j) is coupled connected to the corresponding first wire S(j) and the second wire G(i). Each first wire S(j) and each second wire G(i) are insulated from each other and cross over each other at a corresponding crossing position Z(i, j).

本发明亦揭示一种控制系统，包括多个驱动单元Sd(j)与多个第二驱动单元Gd(i)、多个切换电路Sx(j)与多个第二切换电路Gx(i)，以及多个电容感测单元Sc(j)与多个辅助单元Gc(i)。切换电路Sx(j)耦接于第一导线S(j)、驱动单元Sd(j)与电容感测单元Sc(j)之间；切换电路Gx(i)则耦接于第二导线G(i)、第二驱动单元Gd(i)与辅助单元Gc(i)之间。The present invention also discloses a control system, including a plurality of driving units Sd(j) and a plurality of second driving units Gd(i), a plurality of switching circuits Sx(j) and a plurality of second switching circuits Gx(i), And a plurality of capacitive sensing units Sc(j) and a plurality of auxiliary units Gc(i). The switching circuit Sx(j) is coupled between the first wire S(j), the driving unit Sd(j) and the capacitive sensing unit Sc(j); the switching circuit Gx(i) is coupled to the second wire G( i), between the second driving unit Gd(i) and the auxiliary unit Gc(i).

本发明亦揭示一种控制方法，在一感测阶段中，经由该些第一导线的至少其中的一S(j)感测至少一对应跨越处Z(i，j)的电容；并在一显示阶段中，经由该些第一导线的至少其中的一S(j)驱动至少一对应显示单元D(i，j)进行显示。举例而言，各显示单元D(i，j)设有一晶体管T(i，j)，其受控于第二导线G(i)以选择性地将显示单元D(i，j)导通至对应的第一导线S(j)。在显示阶段中，第二切换电路Gx(i)将第二导线G(j)导通至第二驱动单元Gd(i)，由第二驱动单元Gd(i)导通显示单元D(i，j)的晶体管T(i，j)；切换电路Sx(j)则将第一导线S(j)导通至驱动单元Sd(j)，以经由第一导线S(j)驱动显示单元D(i，j)进行显示。The present invention also discloses a control method. In a sensing phase, at least one of the first wires through at least one S(j) of the first wires senses the capacitance corresponding to at least one crossing point Z(i, j); In the display stage, at least one corresponding display unit D(i, j) is driven to display via at least one S(j) of the first wires. For example, each display unit D(i, j) is provided with a transistor T(i, j), which is controlled by the second wire G(i) to selectively conduct the display unit D(i, j) to The corresponding first wire S(j). In the display phase, the second switching circuit Gx(i) conducts the second wire G(j) to the second driving unit Gd(i), and the second driving unit Gd(i) conducts the display unit D(i, The transistor T(i, j) of j); the switching circuit Sx(j) conducts the first wire S(j) to the driving unit Sd(j), so as to drive the display unit D( i, j) for display.

在感测阶段中，第二切换电路Gx(i)将第二导线G(i)导通至辅助单元Gc(i)以使晶体管T(i，j)停止导通；切换电路Sx(i)则将第一导线S(j)导通至电容感测单元Sc(j)，以量测跨越处Z(i，j)的电容。In the sensing phase, the second switching circuit Gx(i) conducts the second wire G(i) to the auxiliary unit Gc(i) to stop the conduction of the transistor T(i, j); the switching circuit Sx(i) Then, the first wire S(j) is connected to the capacitance sensing unit Sc(j), so as to measure the capacitance across the point Z(i, j).

本发明亦揭示一种触控屏幕，其在显示面板的共同电压导体层上设置多个孔洞，该些孔洞的位置相关于该些跨越处，每一孔洞的平面投影与跨越处的平面投影至少有部份重迭，以增强在跨越处感应电容变化的能力。The present invention also discloses a touch screen. A plurality of holes are arranged on the common voltage conductor layer of the display panel. The positions of the holes are related to the crossovers. The plane projection of each hole and the plane projection of the crossover are at least There is partial overlap to enhance the ability to sense capacitance changes across the span.

为了对本发明的上述及其他方面有更佳的了解，下文特举较佳实施例，并配合附图，作详细说明如下：In order to have a better understanding of the above-mentioned and other aspects of the present invention, the preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows:

附图说明Description of drawings

图1示意根据本发明实施例的一种显示面板。FIG. 1 illustrates a display panel according to an embodiment of the present invention.

图2示意根据本发明实施例的一种控制系统以控制图1显示面板的一种实施例。FIG. 2 illustrates a control system according to an embodiment of the present invention to control an embodiment of the display panel of FIG. 1 .

图3示意的是图2控制系统的运作时序实施例。FIG. 3 schematically shows an embodiment of the operation sequence of the control system in FIG. 2 .

图4示意根据本发明实施例的一种控制系统。Fig. 4 illustrates a control system according to an embodiment of the present invention.

图5示意根据本发明实施例的一种显示面板。FIG. 5 illustrates a display panel according to an embodiment of the present invention.

主要元件符号说明Description of main component symbols

10 显示面板10 display panel

12 基底12 base

20 控制系统20 control system

D(i-1，j-1)-D(i+1，j+2)、D(i，j)-D(i’，j’)  显示单元D(i-1, j-1)-D(i+1, j+2), D(i, j)-D(i’, j’) display unit

T(i-1，j-1)-T(i+1，j+2)、T(i，j)-T(i’，j’)  晶体管T(i-1, j-1)-T(i+1, j+2), T(i, j)-T(i’, j’) transistor

Z(i-1，j-1)-Z(i+1，j+2)、Z(i，j)-Z(i’，j’)  跨越处Z(i-1, j-1)-Z(i+1, j+2), Z(i, j)-Z(i’, j’) across

Gx(i)-Gx(i’)、Sx(j)-Sx(j’)  切换电路Gx(i)-Gx(i’), Sx(j)-Sx(j’) switching circuit

Gd(i)-Gd(i’)、Sd(j)-Sd(j’)  驱动单元Gd(i)-Gd(i’), Sd(j)-Sd(j’) drive unit

Gc(i)、Gc(i’)  辅助单元Gc(i), Gc(i’) Auxiliary unit

Sc(j)、Sc(j’)  电容感测单元Sc(j), Sc(j’) capacitive sensing unit

Vcom  共同电压Vcom common voltage

N1-N3  节点N1-N3 nodes

G(i-1)-G(i+1)，S(j-1)-S(j+2)，G(i)-G(i’)，S(j)-S(j’)  导线G(i-1)-G(i+1), S(j-1)-S(j+2), G(i)-G(i’), S(j)-S(j’) wire

Cr、Cz、C0  电容Cr, Cz, C0 capacitance

OP  放大器OP amplifier

S1-S3  开关S1-S3 switch

V1、V2  电压V1, V2 voltage

Vo  输出信号Vo output signal

P0(i，j)-P0(i’，j)、P1(i，j)-P1(i’，j)  周期P0(i, j)-P0(i’, j), P1(i, j)-P1(i’, j) cycle

Pc(i，j)-Pc(i’，j)  感测阶段Pc(i, j)-Pc(i’, j) sensing stage

Pd(i，j)-Pd(i’，j)  显示阶段Pd(i, j)-Pd(i’, j) display stage

VcomA、VcomB  电位VcomA, VcomB potential

Vcom_ITO  导体层Vcom_ITO conductor layer

PE  显示电极PE display electrode

H  孔洞H hole

具体实施方式Detailed ways

请参考图1，其所示意的是一显示面板10的实施例。显示面板10设有多个显示单元，在图1中即以显示单元D(i-1，j-1)至D(i+1，j+2)作为代表，各显示单元可显示影像的一个子像素；举例而言，显示单元D(i，j)、D(i，j+1)与D(i，j+2)可以是同一像素的三原色子像素。这些显示单元D(i-1，j-1)至D(i+1，j+2)沿着多条纵横交错的导线G(i-1)至G(i+1)以及导线S(j-1)至S(j+2)排列为阵列，各显示单元D(i，j)耦接于对应的导线S(j)与导线G(i)。各导线S(j)与各导线G(i)相互绝缘并在一对应的跨越处Z(i，j)彼此跨越；因此，导线G(i)与S(j)在此跨越处Z(i，j)就会形成等效的互耦电容。Please refer to FIG. 1 , which illustrates an embodiment of adisplay panel 10 . Thedisplay panel 10 is provided with a plurality of display units, which are represented by display units D(i-1, j-1) to D(i+1, j+2) in FIG. 1, and each display unit can display one of the images. Sub-pixels; for example, the display units D(i, j), D(i, j+1) and D(i, j+2) may be three primary color sub-pixels of the same pixel. These display units D(i-1, j-1) to D(i+1, j+2) are arranged along a plurality of criss-cross wires G(i-1) to G(i+1) and wires S(j -1) to S(j+2) are arranged in an array, and each display unit D(i, j) is coupled to the corresponding wire S(j) and wire G(i). Each conductor S(j) and each conductor G(i) are insulated from each other and cross each other at a corresponding crossover position Z(i, j); therefore, conductors G(i) and S(j) cross over each other at this crossover position Z(i , j) will form an equivalent mutual coupling capacitance.

在图1的实施例中，显示单元D(i，j)内包括有晶体管T(i，j)及电容C0。显示单元D(i，j)可以是一液晶显示单元，晶体管T(i，j)可以是一薄膜晶体管，其源极耦接于导线S(j)，栅极耦接于导线G(i)，汲极则耦接于显示单元D(i，j)的显示电极，举例而言，由一氧化铟锡(ITO，Indium Tin Oxide)透明导体层形成的电极；液晶会填充在此一显示电极与另一个传输共同电压Vcom的电极之间，形成显示单元D(i，j)中的电容C0。各导线G(i)与导线S(j)可分别视为栅极导线与源极导线；晶体管T(i，j)受控于导线G(i)的电位，以选择性地将显示单元D(i，j)导通至对应的导线S(j)。In the embodiment of FIG. 1 , the display unit D(i, j) includes a transistor T(i, j) and a capacitor C0. The display unit D(i, j) can be a liquid crystal display unit, the transistor T(i, j) can be a thin film transistor, its source is coupled to the wire S(j), and its gate is coupled to the wire G(i). , the drain is coupled to the display electrode of the display unit D(i, j), for example, an electrode formed by an indium tin oxide (ITO, Indium Tin Oxide) transparent conductor layer; the liquid crystal will fill this display electrode A capacitance C0 in the display unit D(i, j) is formed between another electrode transmitting the common voltage Vcom. Each wire G(i) and wire S(j) can be regarded as a gate wire and a source wire respectively; the transistor T(i, j) is controlled by the potential of the wire G(i) to selectively switch the display unit D (i, j) is turned on to the corresponding wire S(j).

延续图1的实施例，请参考图2与图3。图2示意显示面板10配合一控制系统20运作的实施例，图3则示意控制系统20的运作时序实施例，其横轴为时间。对应显示面板10的各导线G(i)、G(i’)与导线S(j)、S(j’)，控制系统20中设有多个驱动单元Sd(j)、Sd(j’)与驱动单元Gd(i)、Gd(i’)，切换电路Sx(j)、Sx(j’)与切换电路Gx(i)、Gx(i’)，以及电容感测单元Sc(j)、Sc(j’)与辅助单元Gc(i)、Gc(i’)。对应导线S(j)，切换电路Sx(j)耦接于导线S(j)、驱动单元Sd(j)与电容感测单元Sc(j)之间。对应导线G(i)，切换电路Gx(i)则耦接于导线G(i)、驱动单元Gd(i)与辅助单元Gc(i)之间。Continuing the embodiment of FIG. 1 , please refer to FIG. 2 and FIG. 3 . FIG. 2 illustrates an embodiment of the operation of thedisplay panel 10 in cooperation with acontrol system 20 , and FIG. 3 illustrates an embodiment of the operation sequence of thecontrol system 20 , and the horizontal axis is time. Corresponding to the wires G(i), G(i') and wires S(j), S(j') of thedisplay panel 10, thecontrol system 20 is provided with a plurality of drive units Sd(j), Sd(j') and drive units Gd(i), Gd(i'), switching circuits Sx(j), Sx(j'), switching circuits Gx(i), Gx(i'), and capacitive sensing units Sc(j), Sc(j') and auxiliary units Gc(i), Gc(i'). Corresponding to the wire S(j), the switching circuit Sx(j) is coupled between the wire S(j), the driving unit Sd(j) and the capacitive sensing unit Sc(j). Corresponding to the wire G(i), the switching circuit Gx(i) is coupled between the wire G(i), the driving unit Gd(i) and the auxiliary unit Gc(i).

为兼顾显示与触控感测的功能，控制系统20可在时序上周期性地控制显示面板10进行一感测阶段与一显示阶段。在感测阶段中，控制系统20经由导线S(j)感测应跨越处Z(i，j)的电容；在显示阶段中，则经由导线S(j)驱动对应显示单元D(i，j)进行显示。In order to balance the display and touch sensing functions, thecontrol system 20 may periodically control thedisplay panel 10 to perform a sensing phase and a display phase in terms of timing. In the sensing phase, thecontrol system 20 senses the capacitance across Z(i, j) through the wire S(j); in the display phase, it drives the corresponding display unit D(i, j) through the wire S(j). ) to display.

控制系统20利用显示面板10实现触控屏幕的时序实施例可参考图3的下半部。控制系统20会为同一导线S(j)上的各个对应导线G(i)及G(i’)(譬如说i’＝i+1)分别进行周期P1(i，j)与P1(i’，j)的控制，各周期P1(i，j)中有一显示阶段Pd(i，j)与一感测阶段Pc(i，j)。Refer to the lower half of FIG. 3 for the timing example of thecontrol system 20 using thedisplay panel 10 to realize the touch screen. Thecontrol system 20 will perform cycles P1(i, j) and P1(i') for each corresponding wire G(i) and G(i') on the same wire S(j) (for example, i'=i+1) , j) control, each period P1 (i, j) has a display phase Pd (i, j) and a sensing phase Pc (i, j).

在周期P1(i，j)的显示阶段Pd(i，j)中，控制系统20的切换电路Gx(i)会将驱动单元Gd(i)导通至导线G(i)，由驱动单元Gd(i)导通显示单元D(i，j)的晶体管T(i，j)。在晶体管T(i，j)导通后，切换电路Sx(j)也会将驱动单元Sd(j)导通至导线S(j)；经由导通的晶体管T(i，j)，驱动单元Sd(j)就可透过导线S(j)而将显示单元D(i，j)对应的子像素数据(代表显示单元D(i，j)应显示的色阶)传输至其电容C0，驱动显示单元D(i，j)进行显示。换句话说，各驱动单元Gd(i)、Gd(i’)就是驱动显示面板10进行显示的栅极驱动器(gate driver)，驱动单元Sd(j)、Sd(j’)则是源极驱动器(source driver)。In the display phase Pd(i, j) of the period P1(i, j), the switching circuit Gx(i) of thecontrol system 20 will conduct the driving unit Gd(i) to the wire G(i), and the driving unit Gd (i) Turn on the transistor T(i,j) of the display unit D(i,j). After the transistor T(i, j) is turned on, the switching circuit Sx(j) will also turn on the driving unit Sd(j) to the wire S(j); through the turned-on transistor T(i, j), the driving unit Sd(j) can transmit the sub-pixel data corresponding to the display unit D(i, j) (representing the color scale that the display unit D(i, j) should display) to its capacitor C0 through the wire S(j), Drive the display unit D(i, j) to display. In other words, each driving unit Gd(i), Gd(i') is a gate driver for driving thedisplay panel 10 to display, and the driving unit Sd(j), Sd(j') is a source driver (source driver).

另一方面，在周期P1(i，j)的感测阶段Pc(i，j)中，切换电路Gx(i)会切换使辅助单元Gc(i)导通至导线G(i)；切换电路Sx(j)则切换由电容感测单元Sc(j)导通至导线S(j)，以量测跨越处Z(i，j)的电容。辅助单元Gc(i)可经由导线G(i)向晶体管T(i，j)的栅极提供适当的电压，一方面使晶体管T(i，j)维持于不导通的状态，让显示单元D(i，j)能根据电容C0维持的子像素数据持续显示；另一方面，辅助单元Gc(i)在导线G(i)上提供的电压引发适当的电容至电荷转换，使得电容感测单元Sc(j)能量测到跨越处Z(i，j)的等效电容。On the other hand, in the sensing phase Pc(i,j) of the period P1(i,j), the switching circuit Gx(i) switches to conduct the auxiliary unit Gc(i) to the wire G(i); the switching circuit Sx(j) switches the conduction from the capacitance sensing unit Sc(j) to the wire S(j) to measure the capacitance across the point Z(i, j). The auxiliary unit Gc(i) can provide an appropriate voltage to the gate of the transistor T(i, j) through the wire G(i). D(i, j) can continue to display according to the sub-pixel data maintained by the capacitor C0; on the other hand, the voltage provided by the auxiliary unit Gc(i) on the wire G(i) induces the appropriate capacitance to charge conversion, so that the capacitance sensing The unit Sc(j) energy measures the equivalent capacitance across Z(i, j).

周期P1(i，j)结束后，控制系统20可进行另一个周期P1(i’，j)；在切换电路Gx(i’)/Sx(j)的时序控制下，驱动单元Gd(i’)/辅助单元Gc(i’)会分别和驱动单元Sd(j)/电容感测单元Sc(j)协同进行显示阶段Pd(i’，j)与感测阶段Pc(i’，j)的运作，在另一显示单元D(i’，j)上进行显示，并量测另一跨越处Z(i’，j)上因触控引起的电容变化量。After the period P1(i, j) ends, thecontrol system 20 can perform another period P1(i', j); under the timing control of the switching circuit Gx(i')/Sx(j), the drive unit Gd(i' )/auxiliary unit Gc(i') will cooperate with the driving unit Sd(j)/capacitive sensing unit Sc(j) to perform the display phase Pd(i', j) and sensing phase Pc(i', j) In operation, the display is performed on another display unit D(i′, j), and the capacitance variation caused by touch on another crossing point Z(i′, j) is measured.

在一具体实施例中，不同导线S(j)与S(j’)上的切换电路Sx(j)、Sx(j’)，驱动单元Sd(j)、Sd(j’)与电容感测单元Sc(j)、Sc(j’)可同步运作。也就是说，当在导线S(j)上进行周期P1(i，j)时，同步地在导线S(j’)上进行周期P1(i，j’)(未示于图3)，同时以电容感测单元Sc(j)、Sc(j’)分别感测跨越处Z(i，j)与Z(i，j’)的电容，并同时以驱动单元Sd(j)、Sd(j’)分别驱动显示单元D(i，j)、D(i，j’)进行显示。In a specific embodiment, switching circuits Sx(j), Sx(j') on different wires S(j) and S(j'), driving units Sd(j), Sd(j') and capacitive sensing The units Sc(j), Sc(j') can operate synchronously. That is, when period P1(i,j) is performed on conductor S(j), period P1(i,j') is performed on conductor S(j') synchronously (not shown in FIG. 3 ), while Use capacitance sensing units Sc(j) and Sc(j') to sense the capacitance across Z(i, j) and Z(i, j') respectively, and simultaneously use driving units Sd(j), Sd(j ') respectively drive the display units D(i, j) and D(i, j') to display.

在每个周期P1(i，j)中，感测阶段Pc(i，j)与显示阶段Pd(i，j)的进行顺序可以互换；举例而言，可在周期P1(i，j)中先进行显示阶段Pd(i，j)再进行感测阶段Pc(i，j)。In each period P1(i, j), the sequence of the sensing phase Pc(i, j) and the display phase Pd(i, j) can be interchanged; for example, in the period P1(i, j) Among them, the display phase Pd(i, j) is performed first, and then the sensing phase Pc(i, j) is performed.

在图3中，共同电压Vcom会在多个不同电位VcomA与VcomB间反转切换。较佳地，各感测阶段Pc(i，j)都会在共同电压Vcom维持固定电位时进行，避免共同电压Vcom的电位转换影响触控感测。In FIG. 3 , the common voltage Vcom is reversely switched between a plurality of different potentials VcomA and VcomB. Preferably, each sensing phase Pc(i, j) is performed when the common voltage Vcom maintains a fixed potential, so as to prevent the potential transition of the common voltage Vcom from affecting the touch sensing.

在实现触控屏幕之余，于另一模式下，控制系统20也可以仅将显示面板10用于影像显示，其控制时序则如图3上半部所示。在此情形下，导线S(j)配合导线G(i)、G(i’)的每个周期P0(i，j)与P0(i’，j)都只有显示阶段，切换电路Gx(i)、Gx(i’)分别将驱动单元Gd(i)、Gd(i’)持续导通至导线G(i)、G(i’)，切换电路Sx(j)则维持将驱动单元Sd(j)导通至导线S(j)，以在各周期P0(i，j)与P0(i’，j)中分别驱动显示单元D(i，j)与D(i’，j)。各周期P0(i，j)与周期P1(i，j)的时间长短可以相同或相异。In addition to realizing the touch screen, in another mode, thecontrol system 20 can also only use thedisplay panel 10 for image display, and its control sequence is shown in the upper part of FIG. 3 . In this case, each cycle P0(i, j) and P0(i', j) of wire S(j) and wire G(i), G(i') only has a display phase, and the switching circuit Gx(i ), Gx(i') continuously connect the drive units Gd(i), Gd(i') to the wires G(i), G(i'), respectively, and the switching circuit Sx(j) maintains the drive unit Sd( j) Conducting to the wire S(j) to drive the display units D(i,j) and D(i′,j) in each period P0(i,j) and P0(i′,j) respectively. The duration of each period P0(i, j) and period P1(i, j) can be the same or different.

换句话说，藉由控制系统20的时序控制，显示面板10可弹性运作于不同的模式；其可实现触控感测与显示功能，也可以只单纯进行显示功能而停止触控感测，或者，也可以只用于感测触控而不显示(即在各周期中取消显示阶段)。再者，控制系统20也可以在显示面板10的不同部份实现不同的模式。譬如说，在导线G(i)上的各显示单元D(i，j)进行显示并在各跨越处Z(i，j)进行触控感测，在导线G(i’)上则只驱动各显示单元D(i’，j)进行显示，而不对跨越处Z(i’，j)进行触控感测。In other words, through the timing control of thecontrol system 20, thedisplay panel 10 can flexibly operate in different modes; it can realize the touch sensing and display functions, or it can only perform the display function and stop the touch sensing, or , and can also be used only for sensing touch without displaying (that is, canceling the display stage in each cycle). Furthermore, thecontrol system 20 can also implement different modes on different parts of thedisplay panel 10 . For example, each display unit D(i, j) on the wire G(i) performs display and performs touch sensing at each crossing point Z(i, j), while on the wire G(i') only drives Each display unit D(i′, j) performs display, but does not perform touch sensing on the crossing position Z(i′, j).

图4显示辅助单元Gc(i)与电容感测单元Sc(j)的电路实施例。辅助单元Gc(i)在节点N1耦接至切换电路Gx(i)，并设有开关S1与S2，以选择性地将节点N1导通至电压V1与V2的其中之一。电容感测单元Sc(j)可包含一放大器OP，例如一差动运算放大器，其输入端之一于节点N2耦接于切换电路Sx(j)，另一输入端回授至节点N3；配合节点N2与N3间的开关S3与电容Cr，放大器OP可在节点N3的输出端提供一(模拟)输出信号Vo。FIG. 4 shows a circuit embodiment of the auxiliary unit Gc(i) and the capacitive sensing unit Sc(j). The auxiliary unit Gc(i) is coupled to the switching circuit Gx(i) at the node N1, and is provided with switches S1 and S2 to selectively turn on the node N1 to one of the voltages V1 and V2. The capacitive sensing unit Sc(j) may include an amplifier OP, such as a differential operational amplifier, one of its input terminals is coupled to the switching circuit Sx(j) at the node N2, and the other input terminal is fed back to the node N3; Switch S3 and capacitor Cr between nodes N2 and N3, amplifier OP can provide an (analog) output signal Vo at the output terminal of node N3.

在感测阶段中，辅助单元Gc(i)与电容感测单元Sc(j)共同实现一电容至电压转换电路，以将跨越处Z(i，j)的等效互耦电容Cz的电容值转换为输出信号Vo的电压大小。当辅助单元Gc(i)与电容感测单元Sc(j)运作时，感测阶段可划分为三个子时段，在第一个子时段，开关S1将电压V1导通至节点N1，开关S2与S3不导通。在第二个子时段，开关S1停止导通，改由开关S2将电压V2导通至节点N1，开关S3维持不导通；在此情形下，电压V1与V2间的差异会将电容Cz的电容值反应于电荷，并转移至电容Cr，以提供对应的输出信号Vo。在第三个子时段，开关S3导通以重设电容Cr中的电荷。电压V1与V2可以低于晶体管T(i，j)的临限电压，使晶体管T(i，j)在感测阶段中仍维持不导通的状态。输出信号Vo可以另由模拟至数字转换器(未示出)转换为数字信号。In the sensing phase, the auxiliary unit Gc(i) and the capacitive sensing unit Sc(j) jointly realize a capacitance-to-voltage conversion circuit, so that the capacitance value of the equivalent mutual coupling capacitance Cz across Z(i, j) Converted to the voltage of the output signal Vo. When the auxiliary unit Gc(i) and the capacitive sensing unit Sc(j) operate, the sensing phase can be divided into three sub-periods. In the first sub-period, the switch S1 conducts the voltage V1 to the node N1, and the switch S2 and S3 is not conducting. In the second sub-period, the switch S1 stops conducting, and the switch S2 conducts the voltage V2 to the node N1, and the switch S3 remains non-conducting; in this case, the difference between the voltage V1 and V2 will reduce the capacitance of the capacitor Cz The value responds to the charge and is transferred to the capacitor Cr to provide the corresponding output signal Vo. In the third sub-period, the switch S3 is turned on to reset the charge in the capacitor Cr. The voltages V1 and V2 may be lower than the threshold voltage of the transistor T(i, j), so that the transistor T(i, j) remains in a non-conductive state during the sensing phase. The output signal Vo can be further converted to a digital signal by an analog-to-digital converter (not shown).

图4绘示的只是一实施例，其他可用于感测电容的电路架构均可应用于辅助单元Gc(i)与电容感测单元Sc(j)。或者，辅助单元Gc(i)与电容感测单元Sc(j)的架构也可互相调换；也就是说，改将电容感测单元、驱动单元Gd(i)与切换电路Gx(i)群组在一起以对应导线G(i)，并将辅助单元、驱动单元Sd(j)与切换电路Sx(j)群组在一起以对应导线S(j)。FIG. 4 shows only an embodiment, and other circuit structures that can be used for sensing capacitance can be applied to the auxiliary unit Gc(i) and the capacitance sensing unit Sc(j). Alternatively, the structures of the auxiliary unit Gc(i) and the capacitive sensing unit Sc(j) can also be exchanged; that is, the capacitive sensing unit, the driving unit Gd(i) and the switching circuit Gx(i) are grouped instead. Together they correspond to the wire G(i), and the auxiliary unit, the driving unit Sd(j) and the switching circuit Sx(j) are grouped together to correspond to the wire S(j).

于另一实施例中，在图2中不一定要为每一导线G(i)均设置切换电路Gx(i)与辅助单元Gc(i)；某些导线G(i)可以直接耦接至对应驱动单元Gd(i)，只用于影像显示，不进行触控感测。举例而言，若足标i除以3的余数为0，则在控制系统20中为导线G(i)设置对应的切换电路Gx(i)与辅助单元Gc(i)；若足标i除以3的余数为1或2，则在控制系统20中直接将导线G(i)耦接至Gd(i)。或者，不一定要为每一导线S(j)均设置切换电路Sx(j)与电容感测单元Sc(j)。In another embodiment, it is not necessary to set the switch circuit Gx(i) and the auxiliary unit Gc(i) for each wire G(i) in FIG. 2; some wires G(i) can be directly coupled to The corresponding driving unit Gd(i) is only used for image display and does not perform touch sensing. For example, if the remainder of subscript i divided by 3 is 0, the corresponding switching circuit Gx(i) and auxiliary unit Gc(i) are set for the wire G(i) in thecontrol system 20; if subscript i divides If the remainder of 3 is 1 or 2, the wire G(i) is directly coupled to Gd(i) in thecontrol system 20 . Alternatively, the switching circuit Sx(j) and the capacitive sensing unit Sc(j) are not necessarily provided for each wire S(j).

控制系统20可整合实现于一芯片，举例而言，显示面板的时序控制芯片。于另一实施例中，各切换电路Gx(i)与对应的辅助单元Gc(i)、驱动单元Gd(i)整合设置于一栅极驱动器芯片中，各切换电路Sx(j)与对应的电容量测单元Sc(j)、驱动单元Sd(j)则整合设置于一源极驱动器芯片中，各切换电路Sx(j)、Gx(i)在感测阶段与显示阶段间切换的时序则由时序控制芯片予以控制。Thecontrol system 20 can be integrated into a chip, for example, a timing control chip of a display panel. In another embodiment, each switching circuit Gx(i) is integrated with the corresponding auxiliary unit Gc(i) and the driving unit Gd(i) in a gate driver chip, and each switching circuit Sx(j) is connected to the corresponding The capacitance measuring unit Sc(j) and the driving unit Sd(j) are integrated in a source driver chip, and the switching timing of each switching circuit Sx(j) and Gx(i) between the sensing phase and the display phase is It is controlled by the timing control chip.

由于导线G(i)与导线S(j)的排列密度相当高，故利用跨越处Z(i，j)进行触控感测所得的触控位置解析度可以相当精密。较佳地，可将多个相邻跨越处的感测结果综合起来，增进触控感测的量化(quantization)解析度。举例来说，假设在各跨越处Z(i，j)的触控感测结果(譬如说是将输出信号Vo进行模拟至数字转换的结果)原本为m位元的数字信号，集合跨越处Z(i，j)、Z(i，j’)、Z(i’，j)与Z(i’，j’)(譬如说i’＝i+1，j’＝j+1)的数字感测结果，就可在此2*2个跨越处形成的区块中提供(m+2)位元的数字感测结果，可提升量化解析度并降低模拟至数字转换所需的解析度。Since the arrangement density of the wires G(i) and the wires S(j) is quite high, the resolution of the touch position obtained by using the crossing point Z(i, j) for touch sensing can be quite precise. Preferably, the sensing results of multiple adjacent spans can be integrated to improve the quantization resolution of touch sensing. For example, assuming that the touch sensing result (for example, the result of analog-to-digital conversion of the output signal Vo) at each crossing point Z(i, j) is originally an m-bit digital signal, the set crossing point Z Number sense for (i, j), Z(i, j'), Z(i', j) and Z(i', j') (for example, i'=i+1, j'=j+1) If the measurement result is obtained, the (m+2) bit digital sensing result can be provided in the block formed by the 2*2 spans, which can improve the quantization resolution and reduce the resolution required for analog-to-digital conversion.

延续图1与图2的实施例，图5示意显示面板10的一种实施例，例如一扭曲向列型(TN，Twisted Nematic)液晶显示面板。显示面板10可形成于一基底(如一玻璃基底)12；在此基底12上，各显示单元D(i，j)以其晶体管T(i，j)耦接至一显示电极PE，形成电容C0(图1/图2)的一极。显示面板10另设有一导体层Vcom_ITO，覆盖于各显示单元D(i，j)的晶体管T(i，j)之上，由各显示单元D(i，j)共用，用以导通共同电压Vcom，为各显示单元D(i，j)形成电容C0的另一极。举例而言，各显示电极PE可由一氧化铟锡透明导体层形成，而导体层Vcom_ITO则形成于另一氧化铟锡透明导体层。在将本发明技术应用于此种显示面板以实现触控屏幕时，由于导体层Vcom_ITO延伸覆盖显示面板10的所有显示单元D(i，j)，若连各跨越处Z(i，j)也一并覆盖，有可能影响在跨越处Z(i，j)的触控感测。较佳地，可在导体层Vcom_ITO上设置多个贯穿导体层Vcom_ITO的孔洞H，各孔洞对应一个跨越处Z(i，j)，以使跨越处Z(i，j)更容易感应到触控引发的电容变化。举例而言，如图5的右上附图所示，各孔洞H在基底12的平面投影与各跨越处Z(i，j)的平面投影可以至少有部份重迭，使各跨越处Z(i，j)能暴露在导体层Vcom_ITO的覆盖之外。孔洞H的形状可以是任意几何形状，不同跨越处所对应的孔洞形状可以是一致的或是相异的。在某些跨越处也可以不设置对应的孔洞，举例而言，若某些跨越处未用以感测触控，就不必设置对应的孔洞。孔洞的设置可增强以显示面板10进行触控感测的能力，也可增进显示面板10的透光率。Continuing the embodiment of FIG. 1 and FIG. 2 , FIG. 5 illustrates an embodiment of thedisplay panel 10 , such as a twisted nematic (TN, Twisted Nematic) liquid crystal display panel. Thedisplay panel 10 can be formed on a substrate (such as a glass substrate) 12; on thesubstrate 12, each display unit D(i, j) is coupled to a display electrode PE by its transistor T(i, j), forming a capacitor C0 (Picture 1/Picture 2) one pole. Thedisplay panel 10 is further provided with a conductive layer Vcom_ITO, which covers the transistor T(i, j) of each display unit D(i, j), and is shared by each display unit D(i, j) to conduct a common voltage. Vcom forms the other pole of the capacitor C0 for each display unit D(i, j). For example, each display electrode PE can be formed by an ITO transparent conductor layer, and the conductor layer Vcom_ITO is formed on another ITO transparent conductor layer. When the technology of the present invention is applied to such a display panel to realize a touch screen, since the conductor layer Vcom_ITO extends to cover all display units D(i, j) of thedisplay panel 10, even the crossing positions Z(i, j) Covering together may affect the touch sensing at the crossing point Z(i, j). Preferably, a plurality of holes H penetrating through the conductive layer Vcom_ITO can be provided on the conductive layer Vcom_ITO, and each hole corresponds to a crossing point Z(i, j), so that the crossing point Z(i, j) can more easily sense the touch induced capacitance change. For example, as shown in the upper right figure of FIG. 5 , the planar projection of each hole H on thesubstrate 12 and the planar projection of each span Z(i, j) may at least partially overlap, so that each span Z( i, j) can be exposed outside the coverage of the conductor layer Vcom_ITO. The shape of the hole H can be any geometric shape, and the shapes of holes corresponding to different spans can be the same or different. Corresponding holes may not be provided at some crossovers. For example, if some crossovers are not used for sensing touch, corresponding holes do not need to be provided. The arrangement of the holes can enhance the capability of thedisplay panel 10 for touch sensing, and can also increase the light transmittance of thedisplay panel 10 .

于另一实施例中，某些其他种类的显示面板不需设置覆盖显示电极的共同电压导体层，各导线的跨越处直接暴露在可感应外界电容变化的情况下；此种显示面板可不需设置孔洞，直接应用本发明技术来将其实现为一触控屏幕。举例而言，横向电场效应(IPS，In-Plane Swicthing)型液晶显示面板与有机发光二极管(OLED，Organic Light Emitting Diode)就属于此种显示面板，也都可以运用本发明技术将其实现为触控屏幕。In another embodiment, some other types of display panels do not need to be provided with a common voltage conductor layer covering the display electrodes, and the crossing points of each wire are directly exposed to the situation that can sense changes in external capacitance; this kind of display panel does not need to be provided with hole, directly apply the technology of the present invention to realize it as a touch screen. For example, lateral electric field effect (IPS, In-Plane Swicthing) liquid crystal display panel and organic light emitting diode (OLED, Organic Light Emitting Diode) belong to this kind of display panel, and they can also use the technology of the present invention to realize them as touch screens. control screen.

综上所述，虽然本发明已以较佳实施例揭示如上，然其并非用以限定本发明。本发明所属技术领域中具有通常知识者，在不脱离本发明的精神和范围内，当可作各种的更动与润饰。因此，本发明的保护范围当视后附的权利要求书界定为准。To sum up, although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims (10)

Translated fromChinese

1.一种触控屏幕的方法，应用于显示面板包含多个第一导线、多个第二导线与多个显示单元，各第一导线与各第二导线相互绝缘并在一对应的跨越处彼此跨越；各显示单元耦接于该些第一导线的其中之一及该些第二导线的其中之一；该方法包含有：1. A method for touching a screen, applied to a display panel comprising a plurality of first wires, a plurality of second wires and a plurality of display units, each first wire and each second wire are insulated from each other and at a corresponding crossing point across each other; each display unit is coupled to one of the first wires and one of the second wires; the method includes:在一感测阶段中，经由该些第一导线的至少其中的一感测相关于该些跨越处中一跨越处的电容；以及During a sensing phase, sensing via at least one of the first wires is associated with capacitance at one of the spans; and在一显示阶段中，经由该些第一导线的至少其中的一驱动至少一对应显示单元进行显示。In a display phase, at least one corresponding display unit is driven to display through at least one of the first wires.2.如权利要求1所述的方法，其特征在于，各显示单元中包含有一对应晶体管，其受控于该各显示单元对应的该各第二导线以选择性地将该各显示单元导通至对应的该各第一导线，该方法更包含：2. The method according to claim 1, wherein each display unit includes a corresponding transistor, which is controlled by the corresponding second wires of each display unit to selectively conduct each display unit To the corresponding first wires, the method further includes:在该显示阶段中，经由该些第二导线的至少其中的一导通该对应显示单元的该对应晶体管，以经由该对应显示单元对应的该第一导线驱动该对应显示单元进行显示；以及In the display phase, the corresponding transistor of the corresponding display unit is turned on through at least one of the second wires, so as to drive the corresponding display unit to display through the first wire corresponding to the corresponding display unit; and在该感测阶段中，经由该些第二导线的至少其中的一使该对应显示单元的该对应晶体管停止导通，以经由该对应显示单元对应的该第一导线量测该对应显示单元对应于该第一导线与该第二导线的该跨越处的电容。In the sensing phase, stop conducting the corresponding transistor of the corresponding display unit via at least one of the second conducting wires, so as to measure the corresponding Capacitance at the crossover of the first conductive line and the second conductive line.3.如权利要求1所述的方法，其特征在于，在该感测阶段中，将该些第一导线的至少其中的一分别导通至一对应的电容感测单元以量测该对应跨越处的电容。3. The method according to claim 1, wherein, in the sensing phase, at least one of the first wires is respectively connected to a corresponding capacitance sensing unit to measure the corresponding across at the capacitance.4.如权利要求3所述的方法，其特征在于，在该显示阶段中，将该些第一导线的至少其中的一分别导通至一对应的驱动单元以驱动该对应显示单元进行显示。4 . The method according to claim 3 , wherein, in the display phase, at least one of the first wires is respectively connected to a corresponding driving unit to drive the corresponding display unit for display.5.一种触控屏幕，其包含有：5. A touch screen comprising:多个第一导线；a plurality of first conductors;多个第二导线，各第一导线与各第二导线相互绝缘并在一对应的跨越处彼此跨越；A plurality of second wires, each first wire and each second wire are insulated from each other and span each other at a corresponding crossing position;多个显示电极；各显示电极耦接于该些第一导线的其中之一及该些第二导线的其中之一；以及a plurality of display electrodes; each display electrode is coupled to one of the first wires and one of the second wires; and一共同电压导体层，覆盖于些显示电极之上；该共同电压导体层上设有多个孔洞，A common voltage conductor layer covering the display electrodes; a plurality of holes are arranged on the common voltage conductor layer,其中，该些孔洞的位置相关于该些跨越处。Wherein, the positions of the holes are related to the spans.6.如权利要求5所述的触控屏幕，其特征在于，各孔洞的平面投影与该些跨越处的其中的一的平面投影至少有部份重迭。6 . The touch screen according to claim 5 , wherein the plane projection of each hole at least partially overlaps with the plane projection of one of the crossovers. 7 .7.一种控制系统，用以控制一显示面板，该显示面板设有多个第一导线、多个第二导线与多个显示单元，各第一导线与各第二导线相互绝缘并在一对应的跨越处彼此跨越；各显示单元耦接于该些第一导线的其中之一及该些第二导线的其中之一；该控制系统包含有：7. A control system, used to control a display panel, the display panel is provided with a plurality of first wires, a plurality of second wires and a plurality of display units, each first wire and each second wire are insulated from each other and connected in a Corresponding crossovers cross over each other; each display unit is coupled to one of the first wires and one of the second wires; the control system includes:多个电容感测单元，各电容感测单元对应于该些第一导线的其中之一；当该各电容感测单元导通至该对应第一导线时，该各电容感测单元会对该第一导线对应的该些跨越处的至少其中之一进行电容量测；A plurality of capacitive sensing units, each capacitive sensing unit corresponding to one of the first wires; when each capacitive sensing unit is turned on to the corresponding first wire, each capacitive sensing unit will performing capacitance measurement on at least one of the spanning locations corresponding to the first wire;多个驱动单元，各驱动单元对应于该些第一导线的至少其中之一；当该各驱动单元导通至该对应第一导线时，该各驱动单元会对该第一导线耦接的该些显示单元的至少其中之一进行驱动；以及A plurality of drive units, each drive unit corresponds to at least one of the first wires; when each drive unit is connected to the corresponding first wire, each drive unit will be coupled to the first wire drive at least one of the display units; and多个切换电路，各切换电路耦接于该些第一导线的其中之一，该些切换电路在一感测阶段中将该些第一导线分别导通至该些电容感测单元，并在一显示阶段中将该些第一导线分别导通至该些驱动单元。A plurality of switching circuits, each switching circuit is coupled to one of the first wires, and the switching circuits respectively conduct the first wires to the capacitive sensing units in a sensing phase, and In a display phase, the first wires are respectively connected to the driving units.8.如权利要求7所述的控制系统，其特征在于，各显示单元包含一晶体管，其受控于该各显示单元对应的该第二导线以选择性地将该各显示单元导通至该对应的第一导线。8. The control system according to claim 7, wherein each display unit comprises a transistor, which is controlled by the second wire corresponding to each display unit to selectively conduct each display unit to the Corresponding first wire.9.如权利要求8所述的控制系统，其特征在于，还包含：9. The control system of claim 8, further comprising:多个第二驱动单元，各第二驱动单元对应于该些第二导线的至少其中之一；a plurality of second driving units, each second driving unit corresponds to at least one of the second wires;多个辅助单元，各辅助单元对应于该些第二导线的至少其中之一；以及a plurality of auxiliary units, each auxiliary unit corresponding to at least one of the second wires; and多个第二切换电路，各第二切换电路耦接于该些第二导线的其中之一。A plurality of second switching circuits, each second switching circuit is coupled to one of the second wires.10.如权利要求9所述的控制系统，其特征在于，该些第二切换电路在该显示阶段中将该些第二导线导通至对应的第二驱动单元以导通对应的晶体管，并在该感测阶段中将该些第二导线导通至对应的辅助单元以使对应的晶体管停止导通。10. The control system according to claim 9, wherein the second switching circuits connect the second wires to the corresponding second driving unit in the display phase to turn on the corresponding transistors, and In the sensing phase, the second wires are turned on to the corresponding auxiliary units to stop the corresponding transistors from conducting.

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