CN101666932A

Movatterモバイル変換

Info

Publication number: CN101666932A
Application number: CN200910166352A
Authority: CN
Inventors: 张维典; 蔡卲瑜; 王炯翰; 颜俊翔
Original assignee: AU Optronics Corp
Current assignee: AUO Corp
Priority date: 2009-08-24
Filing date: 2009-08-24
Publication date: 2010-03-10
Anticipated expiration: 2029-08-24
Also published as: CN101666932B

Abstract

本发明公开了一种光学式触控显示面板，其包括一液晶显示面板、多个感测组件以及一整合式背光源。感测组件配置于液晶显示面板的边缘，整合式背光源配置于液晶显示面板下方。整合式背光源包括一第一光源以及一第二光源，其中第一光源适于提供一可见光，此可见光经过液晶显示面板的调变后产生一影像。第二光源适于提供一非可见光，当液晶显示面板被触碰时，穿过液晶显示面板的非可见光被散射，且感测组件适于感测被散射的非可见光以推算出触碰点的位置。本发明可以有效地降低制程成本、改善边框过厚的问题，且无须使用到反射组件。

The invention discloses an optical touch display panel, which includes a liquid crystal display panel, a plurality of sensing components and an integrated backlight source. The sensing component is arranged on the edge of the liquid crystal display panel, and the integrated backlight source is arranged under the liquid crystal display panel. The integrated backlight source includes a first light source and a second light source, wherein the first light source is suitable for providing a visible light, and the visible light generates an image after being modulated by the liquid crystal display panel. The second light source is adapted to provide a non-visible light, when the liquid crystal display panel is touched, the non-visible light passing through the liquid crystal display panel is scattered, and the sensing component is adapted to sense the scattered non-visible light to deduce the touch point Location. The invention can effectively reduce the manufacturing process cost, improve the problem of too thick frame, and does not need to use reflective components.

Description

Translated fromChinese

光学式触控显示面板Optical touch display panel

技术领域technical field

本发明是有关于一种触控显示面板(touch-sensing display panel)，且特别是有关于一种光学式触控显示面板。The present invention relates to a touch-sensing display panel, and in particular to an optical touch-sensing display panel.

背景技术Background technique

触控面板依照其感测方式的不同而大致上可区分为电阻式触控面板、电容式触控面板、光学式触控面板、声波式触控面板以及电磁式触控面板。由于光学式触控面板的触控机制适合应用在大尺寸的显示面板中，因此，大尺寸显示面板的触控功能多半是通过光学触控机制来达成。目前的光学式触控显示面板多半采用红外光作为光源，并利用互补金氧半导体光传感器(CMOS opticalsensor)来感测红外光。举例而言，已有制造商将能够发出红外光的红外光发光二极管(IR-LED)以及互补金氧半导体光传感器整合为一外挂模块，并将两个外挂模块组装于显示面板的二角落处。为了让外挂模块中的互补金氧半导体光传感器能够顺利地感测出触碰点的位置，外挂模块仍须搭配能够反射红外光的反射组件(retro-reflector)。值得注意的是，由于反射组件属于较为特殊的反射面，其在制作上与一般的反射片不同，因此反射组件使得制造成本无法进一步降低。此外，由于外挂模块的厚度厚达3.5毫米(millimeter)以上，因此，外挂模块会造成显示面板的边框过厚，进而导致产品的整体外观不佳。According to different sensing methods, touch panels can be roughly divided into resistive touch panels, capacitive touch panels, optical touch panels, acoustic touch panels, and electromagnetic touch panels. Since the touch mechanism of the optical touch panel is suitable for large-size display panels, the touch function of the large-size display panel is mostly achieved through the optical touch mechanism. Most of the current optical touch display panels use infrared light as a light source, and use a complementary metal oxide semiconductor photosensor (CMOS optical sensor) to sense the infrared light. For example, manufacturers have integrated infrared light-emitting diodes (IR-LEDs) capable of emitting infrared light and complementary metal oxide semiconductor photosensors into one plug-in module, and assembled the two plug-in modules at the two corners of the display panel. . In order for the complementary metal oxide semiconductor light sensor in the plug-in module to successfully sense the position of the touch point, the plug-in module still needs to be equipped with a retro-reflector capable of reflecting infrared light. It should be noted that since the reflective component is a relatively special reflective surface, its production is different from that of a general reflective sheet, so the reflective component cannot further reduce the manufacturing cost. In addition, since the thickness of the plug-in module is more than 3.5 millimeters (millimeter), the plug-in module will cause the frame of the display panel to be too thick, thereby resulting in poor overall appearance of the product.

除了上述的外挂模块之外，亦有公知技术(如美国专利US 4,868,550)采用阵列排列的红外光发光二极管以及阵列排列的红外光感测组件来感测触碰点的位置。由于此结构需采用较多数量的红外光发光二极管以及红外光感测组件，因此，制造成本不容易降低。此外，由于红外光发光二极管以及红外光感测组件的数量取决于显示面板的尺寸，当显示面板的尺寸越大时，红外光发光二极管以及红外光感测组件所需的数量便随之增加。In addition to the above-mentioned plug-in modules, there is also a known technology (such as US Pat. No. 4,868,550) that uses an array of infrared light emitting diodes and an array of infrared light sensing components to sense the position of a touch point. Since this structure requires a large number of infrared light emitting diodes and infrared light sensing components, the manufacturing cost is not easy to reduce. In addition, since the quantity of the infrared light emitting diodes and the infrared light sensing components depends on the size of the display panel, when the size of the display panel is larger, the required quantity of the infrared light emitting diodes and the infrared light sensing components will increase accordingly.

发明内容Contents of the invention

本发明解决的技术问题在于，提供一种光学式触控显示面板，其具有整合式背光源。The technical problem to be solved by the present invention is to provide an optical touch display panel with an integrated backlight source.

本发明提供一种光学式触控显示面板，其包括一液晶显示面板、多个感测组件以及一整合式背光源。感测组件配置于液晶显示面板的边缘，整合式背光源配置于液晶显示面板下方。整合式背光源包括一第一光源以及一第二光源，其中第一光源适于提供一可见光，此可见光经过液晶显示面板的调变后产生一影像。第二光源适于提供一非可见光，当液晶显示面板被触碰时，穿过液晶显示面板的非可见光被散射，且感测组件适于感测被散射的非可见光以推算出触碰点的位置。The invention provides an optical touch display panel, which includes a liquid crystal display panel, a plurality of sensing components and an integrated backlight source. The sensing component is arranged on the edge of the liquid crystal display panel, and the integrated backlight source is arranged under the liquid crystal display panel. The integrated backlight source includes a first light source and a second light source, wherein the first light source is suitable for providing a visible light, and the visible light generates an image after being modulated by the liquid crystal display panel. The second light source is adapted to provide a non-visible light, when the liquid crystal display panel is touched, the non-visible light passing through the liquid crystal display panel is scattered, and the sensing component is adapted to sense the scattered non-visible light to deduce the touch point Location.

在本发明的一实施例中，上述的液晶显示面板包括一穿透式(transmissive)液晶显示面板或一半穿透半反射式(transflective)液晶显示面板。In an embodiment of the present invention, the above-mentioned liquid crystal display panel includes a transmissive liquid crystal display panel or a transflective liquid crystal display panel.

在本发明的一实施例中，上述的非可见光为一红外光，而上述的感测组件包括红外光感测组件。在一较佳实施例中，上述的红外光感测组件包括互补金氧半导体光传感器。In an embodiment of the present invention, the above-mentioned invisible light is an infrared light, and the above-mentioned sensing element includes an infrared light sensing element. In a preferred embodiment, the above-mentioned infrared light sensing component includes a complementary metal oxide semiconductor light sensor.

在本发明的一实施例中，上述的感测组件配置于液晶显示面板的二相邻角落处。In an embodiment of the present invention, the above-mentioned sensing components are disposed at two adjacent corners of the liquid crystal display panel.

在本发明的一实施例中，上述的整合式背光源为一直下式背光源。举例而言，前述的直下式背光源具有一灯箱，而第一光源以及第二光源配置于灯箱内。In an embodiment of the present invention, the above-mentioned integrated backlight is a direct-type backlight. For example, the aforementioned direct type backlight has a light box, and the first light source and the second light source are disposed in the light box.

在本发明的一实施例中，上述的整合式背光源为一侧边入光式背光源。举例而言，前述的直下式背光源具有一导光板，而导光板具有一第一入光面以及一第二入光面，第一光源配置于第一入光面旁，且第二光源配置于第二入光面旁。In an embodiment of the present invention, the above-mentioned integrated backlight is a side-illuminated backlight. For example, the aforementioned direct type backlight has a light guide plate, and the light guide plate has a first light incident surface and a second light incident surface, the first light source is arranged next to the first light incident surface, and the second light source is arranged Next to the second light incident surface.

在本发明的一实施例中，上述的可见光为一白光。In an embodiment of the present invention, the above-mentioned visible light is a white light.

在本发明的一实施例中，上述的光学式触控显示面板可进一步包括一与该些感测组件电性连接的触控信号读出电路。In an embodiment of the present invention, the above-mentioned optical touch display panel may further include a touch signal readout circuit electrically connected to the sensing elements.

基于上述，由于本发明将光学式触控显示面板中的触控用光源(lightsource for touch-sensing)以及显示用光源(light source for displaying)整合于同一个背光源中，因此本发明可以有效地降低制程成本、改善边框过厚的问题，且无须使用到反射组件(retro-reflector)。Based on the above, since the present invention integrates the light source for touch-sensing and the light source for displaying in the optical touch display panel into the same backlight source, the present invention can effectively The manufacturing cost is reduced, the problem of excessive thickness of the frame is improved, and no retro-reflector is used.

为让本发明的上述特征和优点能更明显易懂，下文特举实施例，并配合所附图式作详细说明如下。In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

附图说明Description of drawings

图1A为本发明一实施例中光学式触控显示面板的剖面示意图；1A is a schematic cross-sectional view of an optical touch display panel in an embodiment of the present invention;

图1B为图1A中的光学式触控显示面板的上视示意图；FIG. 1B is a schematic top view of the optical touch display panel in FIG. 1A;

图2为本发明另一实施例中光学式触控显示面板的整合式背光源的示意图；2 is a schematic diagram of an integrated backlight source of an optical touch display panel in another embodiment of the present invention;

图3为整合式背光源所发出的光线(包括可见光及非可见光)经过液晶显示面板之后的频谱。FIG. 3 is the spectrum of the light (including visible light and invisible light) emitted by the integrated backlight after passing through the liquid crystal display panel.

其中，附图标记：Among them, reference signs:

100：光学式触控显示面板 110：液晶显示面板100: Optical touch display panel 110: Liquid crystal display panel

120：感测组件 130：整合式背光源120: Sensing component 130: Integrated backlight

132：第一光源 134：第二光源132: First light source 134: Second light source

136：导光板 136a：第一入光面136:Light guide plate 136a: First light incident surface

136b：第二入光面 L1：可见光136b: Second incident light surface L1: Visible light

L2：非可见光 P：触碰点L2: Non-visible light P: Touch point

F：手指 C：触控信号读出电路F: Finger C: Touch signal readout circuit

具体实施方式Detailed ways

图1A为本发明一实施例中光学式触控显示面板的剖面示意图，而图1B为图1A中的光学式触控显示面板的上视示意图。请参照图1A与图1B，本实施例的光学式触控显示面板100包括一液晶显示面板110、多个感测组件120以及一整合式背光源130。感测组件120配置于液晶显示面板110的边缘，整合式背光源130配置于液晶显示面板110下方。整合式背光源130包括一第一光源132以及一第二光源134，其中第一光源132适于提供一可见光L1，且可见光L1经过液晶显示面板110的调变后产生一影像。第二光源134适于提供一非可见光L2，当液晶显示面板110于触碰点P处被触碰时，穿过液晶显示面板110的部分非可见光L2(即触碰点P附近的非可见光L2)会被散射，且感测组件120适于感测被散射的非可见光L2以推算出触碰点P的位置。详言之，当使用者用手指F触碰液晶显示面板110时，触碰点P附近的非可见光L2会被散射，而在这些被散射的部分非可见光L2会朝向感测组件120传递，此时，感测组件120便能够推算出触碰点P的位置。FIG. 1A is a schematic cross-sectional view of an optical touch display panel in an embodiment of the present invention, and FIG. 1B is a schematic top view of the optical touch display panel in FIG. 1A . Please refer to FIG. 1A and FIG. 1B , the opticaltouch display panel 100 of this embodiment includes a liquidcrystal display panel 110 , a plurality ofsensing elements 120 and an integratedbacklight source 130 . Thesensing component 120 is disposed on the edge of the liquidcrystal display panel 110 , and the integratedbacklight source 130 is disposed below the liquidcrystal display panel 110 . The integratedbacklight 130 includes afirst light source 132 and asecond light source 134 , wherein thefirst light source 132 is suitable for providing a visible light L1 , and the visible light L1 is modulated by the liquidcrystal display panel 110 to generate an image. Thesecond light source 134 is adapted to provide a non-visible light L2. When the liquidcrystal display panel 110 is touched at the touch point P, part of the non-visible light L2 passing through the liquid crystal display panel 110 (that is, the non-visible light L2 near the touch point P ) will be scattered, and thesensing component 120 is adapted to sense the scattered invisible light L2 to deduce the position of the touch point P. In detail, when the user touches the liquidcrystal display panel 110 with the finger F, the invisible light L2 near the touch point P will be scattered, and the scattered invisible light L2 will be transmitted toward thesensing element 120, thus , thesensing component 120 can estimate the position of the touch point P.

本实施例可以通过承载液晶显示面板110的机构设计来承载感测组件120。此外，感测组件120在设置时，其下表面可略低于液晶显示面板110的外表面，以进一步改善现有技术中所面临的边框厚度过厚的问题。In this embodiment, thesensor assembly 120 can be carried by the mechanism design of carrying the liquidcrystal display panel 110 . In addition, when thesensing component 120 is arranged, its lower surface may be slightly lower than the outer surface of the liquidcrystal display panel 110, so as to further improve the problem of excessive thickness of the frame in the prior art.

在本实施例中，液晶显示面板110例如是一穿透式(transmissive)液晶显示面板或是一半穿透半反射式(transflective)液晶显示面板。由于穿透式液晶显示面板以及半穿透半反射式液晶显示面板都具有一定程度的透光面积，因此从这些透光面积穿透出的非可见光L2可用来作为触控面板的光源。In this embodiment, the liquidcrystal display panel 110 is, for example, a transmissive liquid crystal display panel or a transflective liquid crystal display panel. Since both the transmissive liquid crystal display panel and the transflective liquid crystal display panel have a certain degree of light transmission area, the invisible light L2 transmitted through these light transmission areas can be used as a light source for the touch panel.

从图1B可知，感测组件120配置于液晶显示面板110的二相邻角落处，而各个感测组件120可以根据所检测到的非可见光L2的入射角来获得触碰点P的位置。详言之，在各个感测组件120检测到被散射后的非可见光L2时，与各个感测组件120电性连接的触控信号读出电路C便会根据感测组件120所传送的信号来推算触碰点P的确切位置。在本实施例中，非可见光L2可为一红外光，而用以检测非可见光L2的感测组件120则为红外光感测组件。举例而言，上述的红外光感测组件可为互补金氧半导体光传感器。It can be seen from FIG. 1B that thesensing elements 120 are disposed at two adjacent corners of the liquidcrystal display panel 110 , and eachsensing element 120 can obtain the position of the touch point P according to the detected incident angle of the invisible light L2 . Specifically, when eachsensing element 120 detects the scattered invisible light L2, the touch signal readout circuit C electrically connected to eachsensing element 120 will detect the signal according to the signal transmitted by thesensing element 120. Calculate the exact position of the touch point P. In this embodiment, the invisible light L2 can be an infrared light, and thesensing element 120 for detecting the invisible light L2 is an infrared light sensing element. For example, the above-mentioned infrared light sensing element can be a complementary metal oxide semiconductor light sensor.

在本实施例中，整合式背光源130中的第一光源132例如为白光发光二极管或其它适于提供可见光L1的发光组件，而第二光源134例如为红外光发光二极管(IR-LED)或其它适于提供非可见光L2的发光组件。在一较佳实施例中，非可见光L2的波长例如是介于750纳米至1000纳米之间。In this embodiment, the firstlight source 132 in theintegrated backlight 130 is, for example, a white light-emitting diode or other light-emitting components suitable for providing visible light L1, and the secondlight source 134 is, for example, an infrared light-emitting diode (IR-LED) or Other light-emitting components suitable for providing non-visible light L2. In a preferred embodiment, the wavelength of the invisible light L2 is, for example, between 750 nm and 1000 nm.

图3为整合式背光源所发出的光线(包括可见光及非可见光)经过液晶显示面板之后的频谱。请参照图1A、图1B以及图3，由于本实施例的液晶显示面板包括液晶盒(LC cell)以及贴附于液晶盒表面上的偏光片，而液晶盒具有彩色滤光膜(红色、绿色、蓝色彩色滤光膜)，因此整合式背光源130中的第一光源132所提供的可见光L1在经过彩色滤光膜及偏光片之后，会产生红光、绿光、蓝光的频谱，而整合式背光源130中的第二光源134所提供的非可见光L2在经过彩色滤光膜及偏光片之后，会产生波长介于750纳米至1000纳米之间的红外光频谱。从图3可知，非可见光L2(红外光)的穿透率不会受到液晶显示面板120中的彩色滤光膜及偏光片的影响，因此本实施例确实是可以达成触控功能的。FIG. 3 is the spectrum of the light (including visible light and invisible light) emitted by the integrated backlight after passing through the liquid crystal display panel. Please refer to Fig. 1A, Fig. 1B and Fig. 3, since the liquid crystal display panel of the present embodiment comprises a liquid crystal cell (LC cell) and a polarizer attached on the surface of the liquid crystal cell, and the liquid crystal cell has a color filter film (red, green , blue color filter film), so the visible light L1 provided by the firstlight source 132 in theintegrated backlight 130 will produce red light, green light, and blue light spectrum after passing through the color filter film and polarizer, and The invisible light L2 provided by the secondlight source 134 in theintegrated backlight 130 will generate an infrared light spectrum with a wavelength between 750 nm and 1000 nm after passing through a color filter film and a polarizer. It can be seen from FIG. 3 that the transmittance of the invisible light L2 (infrared light) is not affected by the color filter films and polarizers in the liquidcrystal display panel 120 , so this embodiment can indeed achieve the touch function.

从图1A与图1B可知，整合式背光源130为一侧边入光式直下型背光源，此整合式直下型背光源具有一导光板136，而导光板136具有一第一入光面136a以及一第二入光面136b，第一光源132配置于第一入光面136a旁，且第二光源134配置于第二入光面136b旁。此外，第一光源132以及第二光源134例如是分别设置于导光板136的两对侧。It can be seen from FIG. 1A and FIG. 1B that theintegrated backlight 130 is a side-illuminated direct-type backlight. The integrated direct-type backlight has alight guide plate 136, and thelight guide plate 136 has a firstlight incident surface 136a. And a secondlight incident surface 136b, the firstlight source 132 is disposed beside the firstlight incident surface 136a, and the secondlight source 134 is disposed beside the secondlight incident surface 136b. In addition, for example, the firstlight source 132 and the secondlight source 134 are respectively disposed on two opposite sides of thelight guide plate 136 .

图2为本发明另一实施例中光学式触控显示面板的整合式背光源的示意图。请参照图2，本实施例的整合式背光源130亦可以采用异于图1A以及图1B的设计，详言之，图2中所绘示的第一光源132以及第二光源134是分别设置于导光板136的相邻两侧边旁。值得注意的是，前述的第一光源132与第二光源134的摆放方式仅是用以举例说明，本发明并不限定第一光源132与第二光源134必须如此摆放。FIG. 2 is a schematic diagram of an integrated backlight source of an optical touch display panel in another embodiment of the present invention. Please refer to FIG. 2, theintegrated backlight 130 of this embodiment can also adopt a design different from that shown in FIG. 1A and FIG. 1B. Specifically, the firstlight source 132 and the secondlight source 134 shown in FIG. 2 are set separately Next to adjacent two sides of thelight guide plate 136 . It should be noted that the above-mentioned arrangement of the firstlight source 132 and the secondlight source 134 is only for illustration, and the present invention does not limit the firstlight source 132 and the secondlight source 134 to be arranged in this way.

由于本实施例已经将第二光源134整合入整合式背光源130中，因此仅有感测组件120需配置于液晶显示面板110的边缘，此设计不会有现有技术所面临的边框厚度过厚的问题。此外，本实施例将第二光源134整合入整合式背光源130的设计概念可以省略反射组件(retro-reflector)的使用，对于光学式触控显示面板100在制造成本方面的降低有一定程度的帮助。Since the secondlight source 134 has been integrated into theintegrated backlight source 130 in this embodiment, only thesensing element 120 needs to be disposed on the edge of the liquidcrystal display panel 110, and this design does not have the excessive thickness of the border faced by the prior art. thick question. In addition, in this embodiment, the design concept of integrating the secondlight source 134 into theintegrated backlight source 130 can omit the use of a retro-reflector, which has a certain degree of reduction in the manufacturing cost of the opticaltouch display panel 100. help.

在本发明的其它可行的实施例中，上述的整合式背光源130亦为一直下式背光源(图中未示)。举例而言，直下式背光源具有一灯箱，而第一光源以及第二光源则配置于灯箱内。In other feasible embodiments of the present invention, the above-mentionedintegrated backlight source 130 is also a direct-type backlight source (not shown in the figure). For example, the direct type backlight has a light box, and the first light source and the second light source are arranged in the light box.

承上述，由于本发明使用整合式背光源中，因此本发明可以有效地降低制程成本、改善边框过厚的问题，且无须使用到反射组件(retro-reflector)。Based on the above, since the present invention uses an integrated backlight source, the present invention can effectively reduce the manufacturing cost and improve the problem of excessively thick frame without using a retro-reflector.

Claims

1. an optical touch display panel is characterized in that, comprising:

One display panels;

A plurality of sensing components are disposed at the edge of this display panels;

One integrated backlight is disposed at this display panels below, and this integrated backlight comprises:

One first light source is suitable for providing a visible light, and wherein this visible light is through producing an image behind the modulation of this display panels; And

One secondary light source is suitable for providing a non-visible light, and when this display panels was touched, this non-visible light that passes this display panels was scattered, and this sensing component is suitable for non-visible light that sensing is scattered to extrapolate the position of touch points.

2. optical touch display panel as claimed in claim 1 is characterized in that, this display panels comprises a penetrate through type liquid crystal display board or a semi-penetrating and semi-reflective liquid crystal display panel.

3. optical touch display panel as claimed in claim 1 is characterized in that this non-visible light is an infrared light, and those sensing components comprise the infrared light sensing component.

4. optical touch display panel as claimed in claim 3 is characterized in that, those infrared light sensing components comprise the complementary metal oxide semiconductor optical sensor.

5. optical touch display panel as claimed in claim 1 is characterized in that, two adjacent angular that those sensing components are disposed at this display panels fall to locating.

6. optical touch display panel as claimed in claim 1 is characterized in that, this integrated backlight is a direct-light-type backlight.

7. optical touch display panel as claimed in claim 6 is characterized in that this direct-light-type backlight has a lamp box, and this first light source and this secondary light source are disposed in this lamp box.

8. optical touch display panel as claimed in claim 1 is characterized in that, this integrated backlight is a side light-in backlight.

9. optical touch display panel as claimed in claim 8, it is characterized in that, this lateral incident type backlight source has a light guide plate, and this light guide plate has one first incidence surface and one second incidence surface, this first light source is disposed at by this first incidence surface, and this secondary light source is disposed at by this second incidence surface.

10. optical touch display panel as claimed in claim 1 is characterized in that, this visible light is a white light.

11. optical touch display panel as claimed in claim 1 is characterized in that, also comprises a touching signals sensing circuit, electrically connects with those sensing components.