LIQUID CRYSTAL DISPLAY APPARATUS AND IMAGE CONTROL METHOD THEREOF

• US 20080284947A1
• Filed: 01/31/2008
• Published: 11/20/2008
• Est. Priority Date: 02/27/2007
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: CHI MEI Optoelectronics Corporation
• Inventors: Li, Wang-Yang, Shih, Ming-Chia
• Granted Patent: US 7,852,432 B2
• Time in Patent Office: Days
• US Class Current: 349/73
• CPC Class Codes: G02F 1/133601 for spatial active dimming
• CPC Class Codes: G02F 1/133609 including means for improving the color mixing, e.g. white
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A liquid crystal display (LCD) apparatus includes a backlight module and a LCD module. The backlight module has a plurality of individually drivable backlight regions. The LCD module has a plurality of display blocks, each of which corresponds to one of the backlight regions and is disposed on an optical path of light emitted from the corresponding backlight regions. A power regulating module is electrically connected to the backlight module and the LCD module for receiving image frame data and controlling light-emitting intensities of the backlight regions in accordance with the image frame data to be displayed by the corresponding display blocks. Each backlight regions has multiple light-emitting units for emitting light in different colors. Each display block has a plurality of pixels, and each of the pixels has multiple filter units. A transmitted spectrum of each of the light-emitting units of the backlight regions corresponds to transmitted spectrums of at least two filter units of each of the pixels in the respective display blocks.

Claims

1. A liquid crystal display (LCD) apparatus, comprising:

a backlight module having a plurality of individually drivable backlight regions,

a LCD module having a plurality of display blocks, wherein each of the display blocks corresponds to one of the backlight regions and is disposed on an optical path of light emitted from the corresponding backlight regions, and

a power regulating module electrically connected to the backlight module and the LCD module for receiving image frame data and controlling light-emitting intensities of the backlight regions in accordance with the image frame data to be displayed by the corresponding display blocks;

wherein

each of the backlight regions has multiple light-emitting units for emitting light in different colors;

each display block has a plurality of pixels, each of the pixels has multiple filter units; and

a transmitted spectrum of each of the light-emitting units of the backlight regions corresponds to transmitted spectrums of at least two filter units of each of the pixels in the respective display blocks.

2. The LCD apparatus according to claim 1, wherein

each of the backlight regions has a first light-emitting unit and a second light-emitting unit for emitting light in different colors;

each of the pixels has a first filter unit, a second filter unit and an enhancing filter unit, a transmitted spectrum of the first filter unit corresponds to a light emitting spectrum of the first light-emitting unit, a transmitted spectrum of the second filter unit corresponds to a light emitting spectrum of the second light-emitting unit, and a transmitted spectrum of the enhancing filter unit corresponds to the light emitting spectrums of the first light-emitting unit and the second light-emitting unit.

3. The LCD apparatus according to claim 2, wherein each of the backlight regions of the backlight module further has a third light-emitting unit having a color different from that of each of the first light-emitting unit and the second light-emitting unit.

4. The LCD apparatus according to claim 3, wherein each of the pixels of the display block further has a third filter unit, a transmitted spectrum of the third filter unit corresponds to a light emitting spectrum of the third light-emitting unit, the transmitted spectrum of the enhancing filter unit corresponds to at least two of the light emitting spectrums of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit.

5. The LCD apparatus according to claim 1, wherein the power regulating module comprises:

a dividing unit for dividing the image frame data into plural image frame data blocks each according to one of the backlight regions and the respective display block; and

an regulating unit electrically connected to the dividing unit, for adjusting a transmission rate of each of the pixels of each display block and the light-emitting intensity of the respective backlight region according to a ratio derived from the corresponding image frame data block.

6. The LCD apparatus according to claim 5, wherein the ratio is equal to a ratio of the highest pixel transmission rate in said image frame data block to a maximum pixel transmission rate.

7. The LCD apparatus according to claim 6, wherein the regulating unit is operable for raising the transmission rate of each of the pixels of the display block and reducing the light-emitting intensity of the respective backlight region according to said ratio.

14. The LCD apparatus according to claim 1, wherein

each of the backlight regions has a first light-emitting unit, a second light-emitting unit and a third light-emitting unit for emitting light in different colors;

and

each of the pixels has a first filter unit, a second filter unit, a third filter unit and an enhancing filter unit, a transmitted spectrum of the first filter unit corresponds to light emitting spectrums of the second light-emitting unit and the third light-emitting unit, a transmitted spectrum of the second filter unit corresponds to light emitting spectrums of the first light-emitting unit and the third light-emitting unit, a transmitted spectrum of the third filter unit corresponds to light emitting spectrums of the first light-emitting unit and the second light-emitting unit, and a transmitted spectrum of the enhancing filter unit corresponds to the light emitting spectrums of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit.

16. The LCD apparatus according to claim 1, wherein

each of the backlight regions has a first light-emitting unit, a second light-emitting unit and a third light-emitting unit for emitting light in different colors;

and

each of the pixels has a first filter unit, a second filter unit and a third filter unit, a transmitted spectrum of the first filter unit corresponds to light emitting spectrums of the second light-emitting unit and the third light-emitting unit, a transmitted spectrum of the second filter unit corresponds to light emitting spectrums of the first light-emitting unit and the third light-emitting unit, and a transmitted spectrum of the third filter unit corresponds to light emitting spectrums of the first light-emitting unit and the second light-emitting unit.

17. The LCD apparatus according to claim 16, further comprising an enhancing filter unit, wherein a transmitted spectrum of the enhancing filter unit corresponds to the light emitting spectrum of at least one of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit.

18. The LCD apparatus according to claim 1, wherein the power regulating module is operable to control the light-emitting intensity of at least one of the light-emitting units of the backlight region in accordance with the image frame data to be displayed by the corresponding display block.

8. An image control method of a liquid crystal display (LCD) apparatus, the LCD apparatus comprising a backlight module and a LCD module, wherein the backlight module has a plurality of individually drivable backlight regions each having multiple light-emitting units for emitting light in different colors, the LCD module has a plurality of display blocks, each of the display blocks corresponds to one of the backlight regions and is disposed on an optical path of light emitted from the light-emitting units of the corresponding backlight regions, each display block has a plurality of pixels, each of the pixels has multiple filter units, a transmitted spectrum of each of the light-emitting units of the backlight regions corresponds to transmitted spectrums of at least two filter units of each of the pixels in the respective display blocks, the image control method comprising:

receiving image frame data to be displayed by the display blocks;

controlling light-emitting intensities of the backlight regions in accordance with the image frame data; and

allowing light emitted from each of the light-emitting units of the backlight regions to pass through said at least two filter units of each of the pixels in the respective display blocks.

9. The method according to claim 8, wherein

each of the backlight regions has a first light-emitting unit and a second light-emitting unit for emitting light in different colors;

each display block has a plurality of pixels, each of the pixels has a first filter unit, a second filter unit and an enhancing filter unit, a transmitted spectrum of the first filter unit corresponds to a light emitting spectrum of the first light-emitting unit, a transmitted spectrum of the second filter unit corresponds to a light emitting spectrum of the second light-emitting unit, and a transmitted spectrum of the enhancing filter unit corresponds to the light emitting spectrums of the first light-emitting unit and the second light-emitting unit;

said method further comprising;

emitting light from at least one of the first and second light-emitting units, through the respective first and second filter units as well as through the enhancing filter unit, to the respective display block.

10. The method according to claim 9, wherein each of the backlight regions of the backlight module further has a third light-emitting unit having a color different from that of each of the first light-emitting unit and the second light-emitting unit, a transmitted spectrum of the third filter unit corresponds to a light emitting spectrum of the third light-emitting unit, the transmitted spectrum of the enhancing filter unit corresponds to at least two of the light emitting spectrums of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit,

said method further comprising:

emitting light from at least one of the first, second and third light-emitting units, through the respective first, second and third filter units as well as through the enhancing filter unit, to the respective display block.

11. The method according to claim 8, wherein the method further comprises:

dividing the image frame data into plural image frame data blocks each according to one of the backlight regions and the respective display block; and

adjusting a transmission rate of each of the pixels of each display block and the light-emitting intensity of the respective backlight region according to a ratio derived from the corresponding image frame data block.

12. The method according to claim 11, wherein the ratio is equal to a ratio of the highest pixel transmission rate in said image frame data block to a maximum pixel transmission rate.

13. The method according to claim 12, wherein said adjusting comprises raising the transmission rate of each of the pixels of the display block and reducing the light-emitting intensity of the respective backlight region according to said ratio.

15. The method according to claim 8, wherein each of the backlight regions has a first light-emitting unit, a second light-emitting unit and a third light-emitting unit for emitting light in different colors, each of the pixels has a first filter unit, a second filter unit, a third filter unit and an enhancing filter unit, a transmitted spectrum of the first filter unit corresponds to light emitting spectrums of the second light-emitting unit and the third light-emitting unit, a transmitted spectrum of the second filter unit corresponds to light emitting spectrums of the first light-emitting unit and the third light-emitting unit, a transmitted spectrum of the third filter unit corresponds to light emitting spectrums of the first light-emitting unit and the second light-emitting unit, and a transmitted spectrum of the enhancing filter unit corresponds to the light emitting spectrums of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit, the image control method further comprising emitting light to the respective display block from at least one of

the first light-emitting unit through the second filter unit, the third filter unit and the enhancing filter unit of each of the pixels of the display block,

the second light-emitting unit through the first filter unit, the third filter unit and the enhancing filter unit of each of the pixels of the display block, and

the third light-emitting unit through the first filter unit, the second filter unit and the enhancing filter unit of each of the pixels of the display block.

19. The method according to claim 8, wherein said controlling comprises adjusting the light-emitting intensity of at least one of the light-emitting units of the backlight region in accordance with the image frame data to be displayed by the corresponding display block.

20. The method according to claim 8, wherein

each of the backlight regions has a first light-emitting unit, a second light-emitting unit and a third light-emitting unit for emitting light in different colors;

and

each of the pixels has a first filter unit, a second filter unit and a third filter unit, a transmitted spectrum of the first filter unit corresponds to light emitting spectrums of the second light-emitting unit and the third light-emitting unit, a transmitted spectrum of the second filter unit corresponds to light emitting spectrums of the first light-emitting unit and the third light-emitting unit, and a transmitted spectrum of the third filter unit corresponds to light emitting spectrums of the first light-emitting unit and the second light-emitting unit;

the image control method further comprising emitting light to the respective display block from

the first light-emitting unit through the second filter unit and the third filter unit of each of the pixels of the display block,

the second light-emitting unit through the first filter unit and the third filter unit of each of the pixels of the display block, and

the third light-emitting unit through the first filter unit and the second filter unit of each of the pixels of the display block.