Display module and LCD having the same

• US 9,316,861 B2
• Filed: 06/05/2008
• Issued: 04/19/2016
• 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
• Primary Examiner(s): SOTO LOPEZ, JOSE R
• Application Number:
  US12/601,707
• Publication Number:
  US 20100171729A1
• Time in Patent Office: 2,875 Days
• Field of Search: 345/211, 345/88, 345/173, 345/175, 345/207
• US Class Current: 1/1
• 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, the center of the red filter and the center of the first transparent electrode being aligned along a first vertical axis,

a second switching device and a second transparent electrode being formed corresponding to a position where the green filter is disposed, the center of the green filter and the center of the second transparent electrode being aligned along a second vertical axis,

a third switching device and a third transparent electrode being formed corresponding to a position where the blue filter is disposed, the center of the blue filter and the center of the third transparent electrode being aligned along a third vertical axis, and

a fourth switching device and a reflective part being formed corresponding to a position where the white filter is disposed, the center of the white filter and the center of the reflective part being aligned along a fourth vertical axis; and

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

wherein light incident from an outside is directly provided at the fourth switching device,

wherein the first switching device is formed on an intersection area of a gate line and a first sub-pixel data line, the second switching device is formed on an intersection area of the gate line and a second sub-pixel data line, the third switching device is formed on an intersection area of the gate line and a third sub-pixel data line, the fourth switching device is formed on an intersection area of the gate line and a fourth sub-pixel data line,

wherein the reflective part is formed with a size corresponding to an area of the white filter, such that the reflective part prevents the light incident from the bottom of the white filter from transmitting through the white filter,

wherein the first, second, and third transparent electrodes are formed in a same horizontal plane in the second substrate as the reflective part,

wherein a size of the fourth sub-pixel area in which the fourth switching device and fourth sub-pixel data line are formed is smaller than a size of each of the first sub-pixel area in which the first switching device and first sub-pixel data line are formed, the second sub-pixel area in which the second switching device and second sub-pixel data line are formed, and the third sub-pixel area in which the third switching device and third sub-pixel data line are formed, and

wherein a size of the white filter is smaller than a size of each of the red filter, the green filter, and the blue filter, and

wherein the reflective part includes a first reflective part formed of a same material as a gate electrode constituting the fourth switching device, the first reflective part being formed on the same layer as the gate electrode constituting the fourth switching device, and the reflective part includes a second reflective part formed of a same material as a drain electrode constituting the fourth switching device, the second reflective part being formed on a same layer as the drain electrode constituting the fourth switching device.

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 part being formed on the same layer as at least one of a gate electrode and a drain electrode constituting the thin film transistor.

15. The display module according to claim 1, wherein the reflective part includes a first reflective part formed of the same material on the same layer as a gate electrode constituting the fourth switching device, and a second reflective part formed of the same material on the same layer as a drain electrode constituting the fourth switching device.

8. A display module comprising:

a pixel area comprising a gate line, a plurality of data lines intersecting the gate line, a first switching device formed on an intersection area of the gate line and a first sub-pixel data line, a first transparent electrode connected to the first switching device, a second switching device formed on an intersection area of the gate line and a second sub-pixel data line, a second transparent electrode connected to the second switching device, a third switching device formed on an intersection area of the gate line and a third sub-pixel data line, a third transparent electrode connected to the first switching device, a fourth switching device formed on an intersection area of the gate line and a fourth sub-pixel data line, and a reflective part connected to the fourth switching device, wherein the first, second, third, and fourth switching devices are formed corresponding to positions where red, green, blue, and white filters are disposed in a substrate, respectively; 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,

wherein light incident from an outside is directly provided at the detection device,

wherein the reflective part is formed with a size corresponding to an area of the white filter, such that the reflective part prevents the light incident from the bottom of the white filter from transmitting through the white filter,

wherein a size of the fourth sub-pixel area is smaller than a size of each of the first sub-pixel area, the second sub-pixel area, and the third sub-pixel area, and

wherein a size of the white filter is smaller than a size of each of the red filter, the green filter, and the blue filter, and

wherein the reflective part includes a first reflective part formed of a same material as a gate electrode constituting the fourth switching device, the first reflective part being formed on the same layer as the gate electrode constituting the fourth switching device, and the reflective part includes a second reflective part formed of a same material as a drain electrode constituting the fourth switching device, the second reflective part being formed on a same layer as the drain electrode constituting the fourth switching device.

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

10. The display module according to claim 9, wherein a current flowing through the detection device is a photo leakage current occurring by incident light.

11. The display module according to claim 8, 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.

12. 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.

13. The display module according to claim 12, 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.

14. The display module according to claim 13, wherein the contact position is detected and a menu item displayed on the contact position is executed.