Liquid crystal display

• US 20070146593A1
• Filed: 02/12/2007
• Published: 06/28/2007
• Est. Priority Date: 12/11/2001
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Ino, Masumitsu
• Granted Patent: US 8,416,374 B2
• Time in Patent Office: Days
• US Class Current: 349/114
• 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

1-24. -24. (canceled)

25. A liquid crystal display having a plurality of pixels each including a reflection element for display by ambient light introduced from the outside and a transmission element for display by light from an internal light source, wherein a reflectance of the light by the reflection element of a selected pixel is 1 percent to 30 percent of the light incident thereon, and a transmittance of the light by the transmission element of a selected pixel is 5 percent to 10 percent of the light incident thereon, and

wherein said display panel is further comprised of a liquid crystal layer and at least one structure selected from the group consisting of a signal line, a gate line, a transistor portion, and a polarization plate.

26. A liquid crystal display as set forth in claim 25, wherein each of said reflection elements has a function of scattering the incident light.

27. A liquid crystal display as set forth in claim 25, wherein each of said reflection elements has a function of regularly reflecting the incident light.

28. A liquid crystal display as set forth in claim 25, wherein each of said reflection elements is comprised of a metal film having a high reflectance.

29. A liquid crystal display as set forth in claim 25, wherein a color filter is provided only at said transmission elements.

30. A liquid crystal display as set forth in claim 29, wherein the color filter is formed at a location corresponding to each pixel, and an opening is formed in said color filter at each of said reflection elements.

31. A liquid crystal display as set forth in claim 30, wherein said opening is centered over of each of said reflection elements.

32. A liquid crystal display as set forth in claim 25, wherein, in said liquid crystal display, under conditions of irradiation of light of said light source of 500 cd/m.sup.2 to 25000 cd/m.sup.2, the amount of the display light is 20 cd/m.sup.2 to 200 cd/m.sup.2.

33. A liquid crystal display as set forth in claim 25, wherein, in said liquid crystal display, under conditions of irradiation of the light of said ambient light of 2000 1×

to 50000 1×

, the amount of the display light is 200 cd/m.sup.2 to 1000 cd/m.sup.2.

34. A liquid crystal display as set forth in claim 25, wherein, in said pixel region, an area of each transmission element is at least 40 percent of the overall pixel, and the area of said reflection element is 1 percent to 60 percent of the overall pixel.

35. A liquid crystal display as set forth in claim 25, wherein, in said pixel region, an aperture ratio of said transmission element is 40 percent to 100 percent of the overall pixel.

36. A liquid crystal display including a plurality of pixels arranged in a matrix on a substrate;

a plurality of transistors formed for every pixel 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 pixels connected to the second electrodes of said transistors and another-electrodes facing those electrodes, wherein a reflection element and a transmission element are arranged in each pixel, a reflectance of the light by the reflection element of a selected pixel is 1 percent to 30 percent of the light incident thereon, and a transmittance of the light by the transmission element of a selected pixel is 5 percent to 10 percent of the light incident thereon.

37. A liquid crystal display as set forth in claim 36, wherein each of said reflection elements has a function of scattering the incident light.

38. A liquid crystal display as set forth in claim 36, wherein each of said reflection elements has a function of regularly reflecting the incident light.

39. A liquid crystal display as set forth in claim 36, wherein each of said reflection elements is formed by a metal film having a high reflectance.

40. A liquid crystal display as set forth in claim 36, wherein a color filter is provided in only said transmission elements.

41. A liquid crystal display as set forth in claim 40, wherein the color filter is formed at a location corresponding to each pixel, and an opening is formed in said color filter at each of said reflection elements.

42. A liquid crystal display as set forth in claim 41, wherein said opening is centered at each of said reflection elements.

43. A liquid crystal display as set forth in claim 36, wherein under conditions of irradiation of the light of said light source of 500 cd/m.sup.2 to 25000 cd/m.sup.2, the amount of the display light is 20 cd/m.sup.2 to 200 cd/m.sup.2.

44. A liquid crystal display as set forth in claim 36, wherein, under conditions of irradiation of the light of said ambient light of 2000 1×

to 50000 1×

, the amount of the display light is 200 cd/m.sup.2 to 1000 cd/m.sup.2.

45. A liquid crystal display as set forth in claim 36, wherein, an area of said transmission element is at least 40 percent of the overall pixel, and the area of said reflection element is 1 percent to 60 percent of the overall pixel.

46. A liquid crystal display as set forth in claim 36, wherein an aperture ratio of said transmission element is 40 percent to 100 percent of the overall pixel.