Liquid crystal display and method of manufacturing the same

• US 20080068331A1
• Filed: 10/30/2007
• Published: 03/20/2008
• Est. Priority Date: 03/11/2002
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), Japan Laser Corporation (JLC Holdings KK)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), Japan Laser Corporation (JLC Holdings KK)
• Inventors: Hayashi, Keiji, Suzuki, Toshihiro, Hamada, Tetsuya, Kobayashi, Tetsuya, Sugawara, Mari, Gotoh, Takeshi
• Application Number:
  US11/978,835
• Publication Number:
  US 20080068331A1
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0257 Reduction of after-image effects
• CPC Class Codes: G09G 2320/064 by time modulation of the brightness of the illumination source
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2077 by a combination of two or more gradation control methods
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

There is provided a liquid crystal display having good display characteristics and a method of driving the same. Pixel data is written in plural pixels on one gate bus line at a top end of a display area at a first point in time on a line sequential basis. At a second point in time, the writing of pixel data in pixels in an upper part of the screen is completed, and writing of pixel data in pixels in a lower part of the screen is started. At a third point in time, the writing of pixel data in the pixels in the lower part of the screen is completed. A fluorescent tube on the upper side of the screen is turned on for a period between a third point in time after the writing of pixel data in the upper part of the screen and a fourth point in time before writing of pixel data for the next frame is started and is turned off in other periods. A fluorescent tube on the lower side of the screen is turned on for a period between a fifth point in time after the writing of pixel data in the lower part of the screen in the preceding frame and a sixth point in time before writing of pixel data in the lower part of the screen is started and is turned off in other periods.

Claims

1. A liquid crystal display comprising:

a backlight unit emitting light from a backside of a liquid crystal display panel,

wherein the backlight unit has a plurality of planar light guide plates having a light entering surface and located contiguously to each other and a plurality of light sources that are provided in a vicinity of a respective light entering surface of the planar light guide plates,

wherein a quantity of light emitted by the backlight unit is controlled in accordance with a luminance data based on an image signal.

2. A liquid crystal display according to claim 1,

wherein the quantity of light emitted by the backlight unit is controlled based on at least any of a maximum value, a minimum value, and an average value of the luminance data based on the image signal.

3. A liquid crystal display according to claim 1,

wherein the quantity of light of each of the planar light guide plates is controlled in accordance with the image signal.

4. A liquid crystal display according to claim 1,

further comprising a liquid crystal molecule perpendicularly aligned.

5. A liquid crystal display according to claim 1,

wherein the planar light guide plate has a wedge-like configuration.

6. A liquid crystal display according to claim 1,

wherein the plurality of the planar light guide plates are provided one over the other.

7. A liquid crystal display according to claim 5,

wherein an end of the planar light guide plate is located contiguously to the light entering surface of the other planar light guide plate.

8. A liquid crystal display according to claim 5,

wherein an end of the planar light guide plate is located contiguously to an end of the other planar light guide plate.