Liquid crystal display with built-in touch panel and method of manufacturing the same

• US 9,207,480 B2
• Filed: 12/28/2010
• Issued: 12/08/2015
• Est. Priority Date: 05/17/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Cho, Sun-Haeng, Jung, Tae-Hyeog
• Primary Examiner(s): Nguyen, Dung
• Assistant Examiner(s): DUONG, TAI V
• Application Number:
  US12/979,864
• Publication Number:
  US 20110279763A1
• Time in Patent Office: 1,806 Days
• Field of Search: 349/12, 349/106, 349/110, 349/122, 349/139, 349/143, 349/187, 345/174, 345/175, 445/24
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

There is provided a liquid crystal display (LCD) with a built-in touch screen panel in which the touch screen panel is built-in the LCD. The LCD with the built-in touch screen panel includes a lower substrate on whose upper surface a pixel electrode is formed, an upper substrate on whose bottom surface facing the lower substrate sensing patterns, color filters, and a common electrode are sequentially formed, and a liquid crystal layer interposed between the lower substrate and the upper substrate.

Claims

1. A liquid crystal display (LCD) having a built-in touch screen panel, the LCD comprising:

a lower substrate having a pixel electrode formed on an upper surface of the lower substrate;

an upper substrate having a black matrix, sensing patterns, color filters, a common electrode, and metal electrodes formed on a bottom surface of the upper substrate, wherein the metal electrodes are disposed to overlap the black matrix formed along an edge of the bottom surface of the upper substrate and are coupled to the sensing patterns; and

a liquid crystal layer interposed between the lower substrate and the upper substrate.

2. The LCD as claimed in claim 1, wherein the upper substrate comprises:

an active area displaying an image and receiving a touch input, the active area comprising;

the sensing patterns formed on the bottom surface of the upper substrate;

a first overcoating layer formed on the sensing patterns;

the color filters formed on the first overcoating layer;

a second overcoating layer formed on the color filters; and

the common electrode formed on the second overcoating layer; and

a non-active area disposed in a periphery of the active area.

3. The LCD as claimed in claim 2, wherein the non-active area of the upper substrate comprises:

the black matrix formed on the bottom surface of the upper substrate in the non-active area of the bottom surface of the upper substrate; and

the metal electrodes overlapping the black matrix in the non-active area.

4. The LCD as claimed in claim 2, further comprising a ground electrode formed between the first overcoating layer and the color filters.

5. The LCD as claimed in claim 1, wherein the sensing patterns comprise:

first sensing cells coupled to each other in a row direction;

first coupling lines coupling the first sensing cells in the row direction;

second sensing cells coupled to each other in a column direction; and

second coupling lines coupling the second sensing cells in the column direction.

6. The LCD as claimed in claim 5, wherein the second sensing cells and the second coupling lines are formed to be one body.

7. The LCD as claimed in claim 5, further comprising an insulating layer disposed between the first coupling lines and the second coupling lines at intersections of the first coupling lines and the second coupling lines.

8. A method of manufacturing an LCD having a built-in touch screen panel, the method comprising:

providing a lower substrate having a pixel electrode formed on an upper surface of the lower substrate;

providing an upper substrate having a black matrix, sensing patterns, color filters, a common electrode, and metal electrodes formed on a bottom surface of the upper substrate, wherein the metal electrodes are disposed to overlap the black matrix formed along an edge of the bottom surface of the upper substrate and are coupled to the sensing patterns;

attaching the lower substrate to the upper substrate so that the pixel electrode of the lower substrate faces the common electrode of the upper substrate; and

injecting a liquid crystal layer between the lower substrate and the upper substrate,

wherein the providing of the upper substrate comprises;

forming the sensing patterns and the metal electrodes on the bottom surface of the upper substrate;

forming a first overcoating layer on the sensing patterns and the metal electrodes;

forming the color filters on the first overcoating layer;

forming a second overcoating layer on the color filters; and

forming the common electrode on the second overcoating layer.

9. The method as claimed in claim 8, further comprising forming the black matrix in a non-active area on the bottom surface of the upper substrate,

wherein the sensing patterns and the color filters are formed in an active area of the upper substrate, and

wherein the non-active area is disposed in a periphery of the active area.

10. The method as claimed in claim 9, wherein the black matrix is formed before the forming of the sensing patterns.

11. The method as claimed in claim 9, wherein the metal electrodes overlap with the black matrix in the non-active area of the bottom surface of the upper substrate.

12. The method as claimed in claim 8, further comprising forming a ground electrode on an entirety of the first overcoating layer between the forming of the first overcoating layer and the forming of the color filters.

13. A method of manufacturing an LCD having a built-in touch screen panel, the method comprising:

providing a lower substrate having a pixel electrode formed on an upper surface of the lower substrate;

providing an upper substrate having a black matrix, sensing patterns, color filters, a common electrode, and metal electrodes formed on a bottom surface of the upper substrate, wherein the metal electrodes are disposed to overlap the black matrix formed along an edge of the bottom surface of the upper substrate and are coupled to the sensing patterns; and

attaching the lower substrate to the upper substrate so that the pixel electrode of the lower substrate faces the common electrode of the upper substrate.

14. The method as claimed in claim 13, further comprising injecting a liquid crystal layer between the lower substrate and the upper substrate.

15. The method as claimed in claim 13, wherein the providing of the upper substrate comprises:

forming the sensing patterns and the metal electrodes on the bottom surface of the upper substrate;

forming a first overcoating layer on the sensing patterns and the metal electrodes;

forming the color filters on the first overcoating layer;

forming a second overcoating layer on the color filters; and

forming the common electrode on the second overcoating layer.

16. The method as claimed in claim 15, further comprising forming the black matrix in a non-active area on the bottom surface of the upper substrate,

wherein the sensing patterns and the color filters are formed in an active area of the upper substrate, and

wherein the non-active area is disposed in a periphery of the active area.

17. The method as claimed in claim 16, wherein the black matrix is formed before the forming of the sensing patterns.

18. The method as claimed in claim 16, wherein the metal electrodes overlap with the black matrix in the non-active area of the bottom surface of the upper substrate.

19. The method as claimed in claim 15, further comprising forming a ground electrode on an entirety of the first overcoating layer between the aiming of the first overcoating layer and the forming of the color filters.