Display Module and LCD Having the Same

• US 20100171729A1
• Filed: 06/05/2008
• Published: 07/08/2010
• Est. Priority Date: 06/05/2007
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Chun, Jin Young
• Granted Patent: US 9,316,861 B2
• Time in Patent Office: Days
• US Class Current: 345/211
• CPC Class Codes: G02F 1/13318 Circuits comprising a photodetector
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

Abstract

An embodiment provides a display module comprising: a first substrate comprising a red filter, a green filter, a blue filter, and a white filter; a second substrate disposed facing the first substrate and comprising a first switching device and a first transparent electrode being formed corresponding to a position where the red filter is disposed, a second switching device and a second transparent electrode being formed corresponding to a position where the green filter is disposed, a third switching device and a third transparent electrode being formed corresponding to a position where the blue filter is disposed, and a fourth switching device and a reflective part being formed corresponding to a position where the white filter is disposed; and a liquid crystal layer formed between the first substrate and the second substrate.

Claims

1. A display module comprising:

a first substrate comprising a red filter, a green filter, a blue filter, and a white filter;

a second substrate disposed facing the first substrate and comprising a first switching device and a first transparent electrode being formed corresponding to a position where the red filter is disposed, a second switching device and a second transparent electrode being formed corresponding to a position where the green filter is disposed, a third switching device and a third transparent electrode being formed corresponding to a position where the blue filter is disposed, and a fourth switching device and a reflective part being formed corresponding to a position where the white filter is disposed; and

a liquid crystal layer formed between the first substrate and the second substrate.

2. The display module according to claim 1, comprising a light detection unit detecting an amount of a current flowing through the fourth switching device by incident light and measuring surrounding luminance.

3. The display module according to claim 1, comprising a contact position detection unit detecting changes in an amount of a current flowing through the fourth switching device and detecting a contact position of an object contacting a surface of the first substrate.

4. The display module according to claim 1, wherein one pixel displaying an image comprises at least each one of the red filter, the green filter, the blue filter, and the white filter as a sub pixel.

5. The display module according to claim 1, wherein the fourth switching device is a thin film transistor comprising an amorphous silicon layer.

6. The display module according to claim 5, wherein a current flowing through the fourth switching device is a photo leakage current occurring in the amorphous silicon layer by incident light.

7. The display module according to claim 5, wherein the reflective part comprises a first reflective part, the first reflective layer being formed on the same layer as at least one of a gate electrode and a drain electrode constituting the thin film transistor.

8. A display module comprising:

a pixel area comprising a gate line, a data line intersecting the gate line, a switching device formed on an intersection area of the gate line and the data line, and a transparent electrode connected to the switching device; and

a contact position detection area comprising the gate line, a sensing line intersecting the gate line, and a detection device disposed on an intersection area of the gate line and the sensing line, and being changed in an amount of a current flowing according to incident light.

9. The display module according to claim 8, comprising a color filter disposed on the pixel area and a white filter disposed on the contact position detection area.

10. The display module according to claim 8, wherein the detection device is a thin film transistor comprising an amorphous silicon layer.

11. The display module according to claim 10, wherein a current flowing through the detection device is a photo leakage current occurring by incident light.

12. The display module according to claim 9, comprising a reflective part disposed on the contact position detection area and formed with a size corresponding to an area of the white filter.

13. The display module according to claim 12, wherein the reflective part comprises a first reflective part, the first reflective part being formed on the same layer as at least one of the gate line and the sensing line.

14. The display module according to claim 8, wherein an amount of a current flowing through the detection device is changed according to whether or not a voltage is applied to the gate line.

15. The display module according to claim 14, wherein changes in an amount of a current flowing through the detection device are detected through scan drive of the gate line, and whether there is an object contact or not and its contact position are determined.

16. The display module according to claim 15, wherein the contact position is detected and a menu item displayed on the contact position is executed.

17. A liquid crystal display device comprising:

a display module; and

a backlight assembly providing light to the display module;

wherein the display module comprises;

a first substrate comprising a red filter, a green filter, a blue filter, and a white filter;

a second substrate disposed facing the first substrate and comprising a first switching device and a first transparent electrode being formed corresponding to a position where the red filter is disposed, a second switching device and a second transparent electrode being formed corresponding to a position where the green filter is disposed, a third switching device and a third transparent electrode being formed corresponding to a position where the blue filter is disposed, and a fourth switching device and a reflective part being formed corresponding to a position where the white filter is disposed; and

a liquid crystal layer formed between the first substrate and the second substrate, wherein the liquid crystal display device comprises a first drive mode and a second drive mode,

wherein the first drive mode displays a color image in a first direction of the display module by adjusting an amount of light transmitted through the red filter, the green filter and the blue filter through light provided form the backlight assembly, and the second drive mode displays a black and white image in the first direction of the display module by using incident light from surrounding and adjusting an amount of light reflected from the reflective part and transmitted through the white filter.

18. The liquid crystal display device according to claim 17, wherein changes in an amount of a current flowing through the fourth switching device are sensed, a contact position of an object contacting a surface of the display module is detected, and a menu item displayed on the contact position is executed.

19. The liquid crystal display device according to claim 17, wherein one pixel displaying an image comprises at least each one of the red filter, the green filter, the blue filter, and the white filter as a sub pixel.

20. The liquid crystal display device according to claim 17, wherein the fourth switching device is a thin film transistor comprising an amorphous silicon layer, and a current flowing through the fourth switching device is a photo leakage current occurring by incident light.