TOUCH-SENSOR-EQUIPPED LIQUID CRYSTAL DISPLAY DEVICE

• US 20180136502A1
• Filed: 03/31/2016
• Published: 05/17/2018
• Est. Priority Date: 04/06/2015
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: MUGIRANEZA, JEAN, OGAWA, HIROYUKI, KIDA, KAZUTOSHI, TADA, KENSHI, YAMAGISHI, SHINJI
• Application Number:
  US15/564,254
• Publication Number:
  US 20180136502A1
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Provided is a touch-sensor-equipped liquid crystal display device in which touch sensors have an improved response speed, with the degradation of image quality being suppressed. A touch-sensor-equipped liquid crystal display device includes: a substrate 1 on which a common electrode 2 and a plurality of pixel electrodes 4 are provided; a color filter substrate 11 that is provided so as to be opposed to the substrate 1, wherein color filters 9 formed at positions corresponding to the pixel electrodes 4, respectively, and a black matrix 10 having openings at positions corresponding to the pixel electrodes 4, respectively, are formed on the color filter substrate 11; a liquid crystal layer 5 provided between the electrode substrate 1 and the color filter substrate 11; a drive electrode 7 that is arranged between the liquid crystal layer 5 and the color filter substrate 11, on or under the black matrix 10; a detection electrode 12 that forms an electrostatic capacitance between the same and the drive electrode 7; and a conductive body 8 that is arranged between the liquid crystal layer 5 and the detection electrode 12, on or under the color filters 9.

Claims

1. A touch-sensor-equipped liquid crystal display device comprising:

an electrode substrate on which a common electrode and a plurality of pixel electrodes are provided;

a color filter substrate that is provided so as to be opposed to the electrode substrate, the color filter substrate including color filters formed at positions corresponding to the pixel electrodes, respectively, and a black matrix having openings at positions corresponding to the pixel electrodes;

a liquid crystal layer provided between the electrode substrate and the color filter substrate;

a drive electrode that is arranged between the liquid crystal layer and the color filter substrate, on or under the black matrix;

a detection electrode that is paired with the drive electrode, for detecting a change in an electrostatic capacitance formed between the detection electrode and the drive electrode; and

a conductive body that is arranged between the liquid crystal layer and the detection electrode, on or under the color filters.

2. The touch-sensor-equipped liquid crystal display device according to claim 1, further comprising an insulator arranged between the color filter substrate and the liquid crystal layer.

3. The touch-sensor-equipped liquid crystal display device according to claim 1,

wherein the conductive body is provided in the same layer as that where the drive electrode is provided.

4. The touch-sensor-equipped liquid crystal display device according to claim 1,

wherein the conductive body is provided in a layer different from that where the drive electrode is provided.

5. The touch-sensor-equipped liquid crystal display device according to claim 1,

wherein the conductive body functions also as a second detection electrode that is paired with the drive electrode, for detecting a change in an electrostatic capacitance formed between the conductive body and the drive electrode.

6. The touch-sensor-equipped liquid crystal display device according to claim 5,

wherein a plurality of the conductive bodies functioning as the second detection electrodes are provided, and at least two of the conductive bodies functioning as the second detection electrodes are electrically connected.

7. The touch-sensor-equipped liquid crystal display device according to claim 1,

wherein liquid crystal molecules in the liquid crystal layer have positive dielectric anisotropy.