Liquid crystal display apparatus

• US 20040109111A1
• Filed: 01/20/2004
• Published: 06/10/2004
• Est. Priority Date: 12/11/2001
• Status: Abandoned Application

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Ino, Masumitsu
• Application Number:
  US10/467,565
• Publication Number:
  US 20040109111A1
• Time in Patent Office: Days
• US Class Current: 349/113
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 2203/02 reflective

Abstract

A liquid crystal display able to deal with high definition display and able to secure both of a transmission type display luminance and a reflection type display luminance, wherein light from backlights 71a and 71b are focused by a lens sheet 74, luminance of the backlights is improved, a transmittance can be set at 4 percent to 10 percent, a reflectance can be set in a range from 1 percent to 25 percent, and high definition display is handled while securing a display light luminance equivalent to that of a liquid crystal display performing only transmission type display and a reflection display light luminance required for the display without increasing a power consumption of the backlights.

Claims

1. A liquid crystal display provided with a display panel having a pixel region in which a reflection region for display by ambient light introduced from the outside and a transmission region for display by light from an internal light source are arranged in parallel, wherein

a reflectance of the light in said display panel by said reflection region is 1 percent to 30 percent and a transmittance of the light in said display panel by said transmission region is 4 percent to 10 percent.

2. A liquid crystal display as set forth in claim 1, wherein said display panel is provided with a focus portion for focusing light incident upon said transmission region.

3. A liquid crystal display as set forth in claim 1, wherein said reflection region has a function of scattering the incident light.

4. A liquid crystal display as set forth in claim 1, wherein said reflection region has a function of regularly reflecting the incident light.

5. A liquid crystal display as set forth in claim 1, wherein said reflection region is formed by a metal film having a high reflectance.

6. A liquid crystal display as set forth in claim 1, wherein a color filter is provided in only said transmission region.

7. A liquid crystal display as set forth in claim 1, wherein the color filter is formed at a location corresponding to said pixel region, and an opening is formed in said reflection region of said color filter.

8. A liquid crystal display as set forth in claim 7, wherein said opening is formed at the approximate center of said reflection region.

9. A liquid crystal display as set forth in claim 1, wherein, in said display panel, under conditions of irradiation of the light of said light source of 500 cd/m² to 25000 cd/m², the amount of the display light is 20 cd/m² to 200 cd/m².

10. A liquid crystal display as set forth in claim 1, wherein, in said display panel, under conditions of irradiation of the light of said ambient light of 2000 lx to 50000 lx, the amount of the display light is 200 cd/m² to 1000 cd/m².

11. A liquid crystal display as set forth in claim 1, wherein, in said pixel region, an area of said transmission region is at least 40 percent of the overall pixel region, and the area of said reflection region is 1 percent to 60 percent of the overall pixel region.

12. A liquid crystal display as set forth in claim 1, wherein, in said pixel region, an aperture ratio of said transmission region is 40 percent to 100 percent of the overall pixel region.

13. A liquid crystal display provided with a display panel including a plurality of pixel regions arranged in a matrix on a substrate;

a plurality of transistors formed for every pixel region and arranged in a matrix;

a plurality of gate lines for connecting gate electrodes of the plurality of transistors;

a plurality of data signal lines for connecting first electrodes of the plurality of transistors;

storage capacitors having one-electrodes connected to the second electrodes of said transistors;

storage capacitor lines for connecting another-electrodes of said storage capacitors; and

a liquid crystal layer arranged between one-electrodes of said pixel regions connected to the second electrodes of said transistors and another-electrodes facing those electrodes, wherein

a reflection region and a transmission region are arranged in parallel in each pixel region,

a reflectance of the light in said display panel by said reflection region is 1 percent to 30 percent, and a transmittance of the light in said display panel by said transmission region is 4 percent to 10 percent.

14. A liquid crystal display as set forth in claim 13, wherein said display panel is provided with a focus portion for focusing the light incident upon said transmission region.

15. A liquid crystal display as set forth in claim 13, wherein said transistor is a thin film transistor using low temperature polycrystalline silicon as a semiconductor layer.

16. A liquid crystal display as set forth in claim 13, wherein said reflection region has the function of scattering the incident light.

17. A liquid crystal display as set forth in claim 13, wherein said reflection region has the function of regularly reflecting the incident light.

18. A liquid crystal display as set forth in claim 13, wherein said reflection region is formed by a metal film having a high reflectance.

19. A liquid crystal display as set forth in claim 13, wherein a color filter is provided in only said transmission region.

20. A liquid crystal display as set forth in claim 13, wherein the color filter is formed at a location corresponding to said pixel region, and an opening is formed in said reflection region of said color filter.

21. A liquid crystal display as set forth in claim 20, wherein said opening is formed at the approximate center of said reflection region.

22. A liquid crystal display as set forth in claim 13, wherein said reflection region is formed in a region just above either one of an interconnect region of a gate line, an interconnect region of a data signal line, an interconnect region of a storage capacitor line, and a formation region of said transistors or a region obtained by combining a plurality of the regions.

23. A liquid crystal display as set forth in claim 13, wherein said gate lines and said storage capacitor lines are separately formed.

24. A liquid crystal display as set forth in claim 13, wherein the display has a Cs-on-gate structure where said storage capacitor is connected to the gate line of a previous stage and the storage capacitor is superimposed on the gate line.