Liquid crystal display device with touch panel

• US 10,302,984 B2
• Filed: 08/31/2017
• Issued: 05/28/2019
• Est. Priority Date: 01/24/2012
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Aoki, Yoshinori, Sasanuma, Keita, Matsumura, Kazune
• Primary Examiner(s): Arendt, Paisley L
• Application Number:
  US15/691,883
• Publication Number:
  US 20180039119A1
• Time in Patent Office: 635 Days
• Field of Search: 349 12
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13456 Cell terminals located on one side of the display only
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 3/3618 with automatic refresh of the display panel using sense/write circuits
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors

Abstract

A second substrate has detection electrodes of a touch panel, each of pixels has a pixel electrode and a counter electrode, the counter electrode is divided into a plurality of blocks, the counter electrodes of the respective divided blocks are commonly provided for the respective pixels of the plurality of display liner in series, and the counter electrodes also serve as scanning electrodes of the touch panel, and a counter electrode selector circuit that selects the counter electrodes. The counter electrode selector circuit includes an address decoder circuit that selects the counter electrodes of the respective blocks for a given period, and a selector circuit that applies a touch panel scanning voltage to the counter electrode of the block selected by the address decoder circuit, and applies a counter voltage to the counter electrodes of the blocks not selected by the address decoder circuit.

Claims

1. A display device comprising:

a first substrate;

a second substrate;

a plurality of pixel electrodes provided on the first substrate;

a common electrode facing to the plurality of pixel electrodes commonly and divided into a plurality of blocks;

an output circuit provided on the first substrate and selecting a block of the plurality of blocks during a touch detecting period;

a pulse signal line supplying a touch detecting pulse to the output circuit; and

a common voltage line supplying a common voltage to the output circuit,

wherein the output circuit electrically connects between the pulse signal line and selected block which is selected during the touch detecting period,

wherein the output circuit electrically connects between the common voltage line and other blocks of the plurality of blocks which are not selected by the output circuit,

wherein the plurality of pixel electrodes are electrically connected to a plurality of switching elements respectively,

wherein the first substrate has a plurality of scanning signal lines which supply a control signal to the plurality of switching elements,

wherein the first substrate has a scanning line driver circuit that applies the control signal to the plurality of scanning signal lines,

wherein the plurality of pixel electrodes arranged in a matrix configure a display area, and

wherein the pulse signal line is arranged between the scanning line driver circuit and the display area.

2. The display device according to claim 1,

wherein the output circuit electrically connects between the pulse signal line and two adjacent blocks of the plurality of blocks at a same time.

3. The display device according to claim 1,

wherein the first substrate has a plurality of display lines which supplies a display signal to the plurality of pixel electrodes, and

wherein each block of the common electrode is commonly provided for the plurality of pixel electrodes of one display line respectively.

4. The display device according to claim 1,

wherein the output circuit includes:

an address decoder circuit that selects at least one block of the plurality of blocks respectively for a given period; and

the output circuit applies the touch detecting pulse to the at least one block of the plurality of blocks selected by the address decoder circuit, and applies the common voltage to other blocks of the plurality of blocks not selected by the address decoder circuit.

5. The display device according to claim 1,

wherein the output circuit is arranged between the scanning line driver circuit and the display area.

6. The display device according to claim 5,

wherein the pulse signal line is provided between the scanning line driver circuit and the output circuit.

7. A display device comprising:

a first substrate;

a second substrate;

a plurality of pixel electrodes provided on the first substrate;

a common electrode facing to the plurality of pixel electrodes commonly and divided into a plurality of blocks;

an output circuit provided on the first substrate and selecting a block of the plurality of blocks during a touch detecting period;

a detecting signal line supplying a touch detecting pulse to the output circuit; and

a common voltage line supplying a common voltage to the output circuit,

wherein the output circuit electrically connects between the detecting signal line and selected block which is selected during the touch detecting period,

wherein the output circuit electrically connects between the common voltage line and other blocks of the plurality of blocks which are not selected by the output circuit,

wherein the plurality of pixel electrodes are electrically connected to a plurality of switching elements respectively,

wherein the first substrate has a plurality of scanning signal lines which supply a control signal to the plurality of switching elements,

wherein the first substrate has a scanning line driver circuit that applies the control signal to the plurality of scanning signal lines,

wherein the plurality of pixel electrodes arranged in a matrix configure a display area, and

wherein the detecting signal line and the common voltage line are arranged between the scanning line driver circuit and the display area.

8. The display device according to claim 7,

wherein the output circuit electrically connects between the detecting signal line and two adjacent blocks of the plurality of blocks at a same time.

9. The display device according to claim 7,

wherein the first substrate has a plurality of display lines which supplies a display signal to the plurality of pixel electrodes, and

wherein each block of the common electrode is commonly provided for the plurality of pixel electrodes of one display line respectively.

10. The display device according to claim 7,

wherein the output circuit includes:

an address decoder circuit that selects at least one block of the plurality of blocks respectively for a given period; and

the output circuit applies the touch detecting pulse to the at least one block of the plurality of blocks selected by the address decoder circuit, and applies the common voltage to other blocks of the plurality of blocks not selected by the address decoder circuit.

11. The display device according to claim 7,

wherein the output circuit is arranged between the scanning line driver circuit and the display area.

12. The display device according to claim 7,

wherein the detecting signal line is provided between the scanning line driver circuit and the output circuit.