MULTIPLE PRIMARY COLORS LIQUID CRYSTAL DISPLAY AND DRIVING METHOD THEREOF

• US 20160042703A1
• Filed: 08/21/2014
• Published: 02/11/2016
• Est. Priority Date: 08/08/2014
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: FAN, Yong
• Granted Patent: US 9,384,702 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• 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

Abstract

The present invention provides a multiple primary colors liquid crystal display and a driving method thereof. The multiple primary colors liquid crystal display comprises a LED backlight source (1) and a liquid crystal display panel (3); the LED backlight source (1) comprises a plurality of red, green, blue and cyan LEDs (11, 12, 13, 14); the liquid crystal display panel (3) comprises a CF substrate (33), and the CF substrate (33) comprises a plurality of red, green and blue filters (331, 333, 335). The red, green and blue LEDs (11, 12, 13) are activated as showing the first color frame, and lights transmitting through the red, green and blue filters (331, 333, 335) respectively are red light R, green light G and blue light B; the red and cyan LEDs (11, 14) are activated as showing the second color frame, and lights transmitting through the red, green and blue filters (331, 333, 335) respectively are the red light R, a first cyan light C1 and a second cyan light C2, capable of basically and completely achieving all objects'"'"' colors of nature.

Claims

1. A multiple primary colors liquid crystal display, comprising:

a LED backlight source and a liquid crystal display panel positioned on the LED backlight source;

the LED backlight source comprises a plurality of red, green, blue and cyan LEDs;

the liquid crystal display panel comprises a CF substrate, and the CF substrate comprises a plurality of red, green and blue filters, and each of the red, green and blue filters corresponds to a sub pixel, and transmission spectrums of the green and the blue filters comprise a wavelength range of cyan light emitted by the cyan LEDs;

the multiple primary colors liquid crystal display shows an entire image by a combination of first and second color frames;

the red, green and blue LEDs are activated as showing the first color frame, and lights transmitting through the red, green and blue filters respectively are red light R, green light G and blue light B to construct a first sub frame of the entire image;

the red and cyan LEDs are activated as showing the second color frame, and lights transmitting through the red, green and blue filters respectively are the red light R, a first cyan light C1 and a second cyan light C2 to construct a second sub frame of the entire image.

2. The multiple primary colors liquid crystal display according to claim 1, wherein a wavelength range of the red light emitted by the red LEDs is 620-660 nm, and a peak width at half height thereof is 25-40 nm;

a wavelength range of the green light emitted by the green LEDs is 520-540 nm, and a peak width at half height thereof is 20-40 nm;

a wavelength range of the blue light emitted by the blue LEDs is 435-460 nm, and a peak width at half height thereof is 15-25 nm;

a wavelength range of the cyan light emitted by the cyan LEDs is 490-520 nm, and a peak width at half height thereof is 20-40 nm.

3. The multiple primary colors liquid crystal display according to claim 1, wherein a transmission spectrum of the green filter is 460-630 nm;

a transmission spectrum of the blue filter is 400-530 nm.

4. The multiple primary colors liquid crystal display according to claim 2, wherein a wavelength of the red light emitted by the red LEDs is 632 nm, and the peak width at half height thereof is 32 nm;

a wavelength of the green light emitted by the green LEDs is 539 nm, and the peak width at half height thereof is 25 nm;

a wavelength of the blue light emitted by the blue LEDs is 450 nm, and the peak width at half height thereof is 18 nm;

a wavelength of the cyan light emitted by the cyan LEDs is 509 nm, and the peak width at half height thereof is 26 nm;

wavelengths of the first cyan light C1 and the second cyan light C2 respectively are 510 nm and 505 nm.

5. The multiple primary colors liquid crystal display according to claim 1, wherein the red light R of the first color frame and the red light R of the second color frame respectively provide half of red light required for the entire image.

6. The multiple primary colors liquid crystal display according to claim 1, wherein gray scales of the first cyan light C1 and the second cyan light C2 are different, and the entire image is shown by the five primary colors, red, green, blue, first cyan and second cyan.

7. The multiple primary colors liquid crystal display according to claim 1, wherein gray scales of the first cyan light C1 and the second cyan light C2 are the same, and the entire image is shown by the four primary colors, red, green, blue and cyan.

8. The multiple primary colors liquid crystal display according to claim 1, wherein the liquid crystal display panel further comprises a TFT substrate positioned under the CF substrate and a liquid crystal layer located between the TFT substrate and the CF substrate.

9. A driving method of a multiple primary colors liquid crystal display, comprising steps of:

step 1, inputting R, G, B signals to show an entire image;

step 2, implementing color conversion to the R, G, B signals to be converted into R, G, B, C1, C2 colors space;

step 3, implementing gamma correction to R, G, B, C1, C2 signals to obtain R′

, G′

, B′

, C1 ‘

, C2’

gray scale signals after correction;

step 4, outputting the R′

, G′

, B′

gray scale signals as showing a first color frame;

step 5, outputting the R′

, C1′

, C2′

gray scale signals as showing a second color frame.

10. The multiple primary colors liquid crystal display according to claim 9, wherein a gray scale of the R′

gray scale signal in the fourth step and a gray scale of the R′

gray scale signal in the fifth step are the same.

11. A driving method of a multiple primary colors liquid crystal display, comprising steps of:

step 1, inputting R, G, B signals to show an entire image;

step 2, implementing color conversion to the R, G, B signals to be converted into R, G, B, C1, C2 colors space;

step 3, implementing gamma correction to R, G, B, C1, C2 signals to obtain R′

, G′

, B′

, C1 ‘

, C2’

gray scale signals after correction;

step 4, outputting the R′

, G′

, B′

gray scale signals as showing a first color frame;

step 5, outputting the R′

, C1′

, C2′

gray scale signals as showing a second color frame;

wherein a gray scale of the R′

gray scale signal in the fourth step and a gray scale of the R′

gray scale signal in the fifth step are the same.