Liquid crystal display panel and liquid crystal display apparatus including the same

• US 9,891,457 B2
• Filed: 12/14/2015
• Issued: 02/13/2018
• Est. Priority Date: 12/26/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Jinseong, Kim, CheolSe, Kim, JuHan, Park, YongChan, Kim, Seungkyeom
• Primary Examiner(s): Nguyen, Hoan C
• Application Number:
  US14/968,523
• Publication Number:
  US 20160187694A1
• Time in Patent Office: 792 Days
• Field of Search: 349 12
• 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 1/133562 on the viewer side
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A liquid crystal display panel and an LCD apparatus including the same, may include a thin film transistor (TFT) substrate including a touch electrode and a switching transistor that is disposed over a color filter (CF) substrate including a color filter, such that the TFT substrate is exposed to an outside of the LCD panel or LCD apparatus.

Claims

1. A liquid crystal display panel comprising:

a thin film transistor (TFT) substrate including a plurality of touch electrodes, a plurality of subpixels respectively including a plurality of pixel electrodes, and a plurality of switching transistors;

a color filter (CF) substrate including a plurality of common electrodes and a plurality of color filters respectively corresponding to the plurality of subpixels; and

a liquid crystal layer disposed between the TFT substrate and the CF substrate, and liquid crystal being in the liquid crystal layer,

wherein each of the plurality of touch electrodes comprises;

a touch line connected in common to two or more adjacent subpixels which are disposed on one horizontal line; and

a touch electrode line disposed to overlap a data line included in the TFT substrate and electrically connected to two or more adjacent touch lines which are along the data line,

wherein the touch line comprises;

a main touch line extending to a subpixel adjacent thereto; and

a unit touch line branching from the main touch line,

wherein the unit touch line is disposed along an outer portion of the pixel electrode included in each of the two or more adjacent subpixels, and

wherein the main touch line and the unit touch line in each of the two or more adjacent subpixels form enclosed rectangular rings overlapping the two or more adjacent subpixels, respectively.

2. The liquid crystal display panel of claim 1, wherein the touch line comprises the unit touch line disposed in a tetragonal shape along an outer portion of a pixel electrode disposed in a subpixel including the touch line.

3. The liquid crystal display panel of claim 1, wherein the TFT substrate comprises:

a base substrate;

the plurality of touch electrode lines disposed on the base substrate;

a first passivation layer disposed on the plurality of touch electrode lines;

the plurality of touch lines disposed on the first passivation layer;

a gate insulation layer disposed on the plurality of touch lines;

a plurality of data lines disposed on the gate insulation layer to overlap the plurality of touch electrode lines;

a second passivation layer disposed on the plurality of data lines; and

the plurality of pixel electrodes disposed on the second passivation layer.

4. The liquid crystal display panel of claim 3, wherein each of the plurality of touch lines is electrically connected to a corresponding touch electrode line through a touch electrode contact hole provided in the first passivation layer.

5. The liquid crystal display panel of claim 3, wherein the plurality of touch electrodes are disposed on a lower end of the CF substrate;

and at least one touch line of the plurality of touch lines is disposed between at least one touch electrode of the plurality of touch electrodes and at least one data line of the plurality of data lines, and

wherein the at least one touch electrode, the at least one touch line and the at least one data line overlap each other and are configured to block a same light.

6. The liquid crystal display panel of claim 3, wherein the plurality of touch electrodes are arranged in a direction parallel to the plurality of data lines and a plurality of gate lines, and overlap a black matrix.

7. The liquid crystal display panel of claim 1, wherein a size of each of the plurality of subpixels is smaller than a size of each of the plurality of touch electrodes and, at least one of the plurality of touch electrodes is disposed over two or more of the plurality of subpixels.

8. The liquid crystal display panel of claim 1, wherein the plurality of touch electrodes are of a capacitive type and integrated as one body with the TFT substrate.

9. A liquid crystal display (LCD) apparatus comprising:

a liquid crystal display panel including a plurality of touch electrodes;

a panel driver driving the liquid crystal display panel; and

a touch sensing unit configured to determine whether the liquid crystal display panel is touched, based on a plurality of sensing signals respectively received from the plurality of touch electrodes,

wherein the liquid crystal display panel comprises;

a thin film transistor (TFT) substrate including the plurality of touch electrodes, a plurality of subpixels respectively including a plurality of pixel electrodes, and a plurality of switching transistors;

a color filter (CF) substrate including a plurality of common electrodes and a plurality of color filters respectively corresponding to the plurality of subpixels; and

a liquid crystal layer disposed between the TFT substrate and the CF substrate, and liquid crystal in the liquid crystal layer,

wherein the TFT substrate is disposed on the CF substrate to contact an outside of the LCD apparatus,

wherein each of the plurality of touch electrodes comprises;

a touch line connected in common to two or more adjacent subpixels which are disposed on one horizontal line; and

a touch electrode line disposed to overlap a data line included in the TFT substrate and electrically connected to two or more adjacent touch lines which are along the data line,

wherein the touch line comprises;

a main touch line extending to a subpixel adjacent thereto; and

a unit touch line branching from the main touch line,

wherein the unit touch line is disposed along an outer portion of the pixel electrode included in each of the two or more adjacent subpixels, and

wherein the main touch line and the unit touch line in each of the two or more adjacent subpixels form enclosed rectangular rings overlapping the two or more adjacent subpixels, respectively.

10. The LCD apparatus of claim 9, wherein the touch line comprises the unit touch line disposed in a tetragonal shape along an outer portion of a pixel electrode disposed in a subpixel including the touch line.

11. The LCD apparatus of claim 9, wherein the TFT substrate comprises:

a base substrate;

the plurality of touch electrode lines disposed on the base substrate;

a first passivation layer disposed on the plurality of touch electrode lines;

the plurality of touch lines disposed on the first passivation layer;

a gate insulation layer disposed on the plurality of touch lines;

a plurality of data lines disposed on the gate insulation layer to overlap the plurality of touch electrode lines;

a second passivation layer disposed on the plurality of data lines; and

the plurality of pixel electrodes disposed on the second passivation layer.

12. The LCD apparatus of claim 11, wherein each of the plurality of touch lines is electrically connected to a corresponding touch electrode line through a touch electrode contact hole provided in the first passivation layer.

13. The LCD apparatus of claim 11, wherein the plurality of touch electrodes are disposed on a lower end of the CF substrate, and at least one touch line of the plurality of touch lines is disposed between at least one touch electrode of the plurality of touch electrodes, and at least one data line of the plurality of data lines, and

wherein the at least one touch electrode, the at least one touch line and the at least one data line overlap each other and are configured to block a same light.

14. The LCD apparatus of claim 11, wherein the plurality of touch electrodes are arranged in a direction parallel to the plurality of data lines and a plurality of gate lines, and overlap a black matrix.

15. The LCD apparatus of claim 9, wherein a size of each of the plurality of subpixels is smaller than a size of each of the plurality of touch electrodes and, at least one of the plurality of touch electrodes is disposed over two or more of the plurality of subpixels.

16. The LCD apparatus of claim 9, wherein the plurality of touch electrodes are of a capacitive type and integrated as one body with the TFT substrate.