Display system having original image be displayed without color difference

Patent metadata

Field	Value
Publication number	US-12100364-B2
Application number	US-202017593030-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Mar 6, 2019
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A display system includes a light source system including a light source array formed from multiple light source units, and used to emit a light beam, wherein the light source array can be divided into I×J sub-regions; a display unit disposed on an emergent light path of the light source system, and used to modulate a light spot on a surface thereof according to a light spot modulation signal, so as to generate image light; and a dynamic control module for obtaining the light spot modulation signal and a current modulation signal according to an image signal, dynamically updated chromaticity information and maximum brightness information of the light source units, and a correlation curve between a modulation current and brightness, wherein the current modulation signal is used to adjust the light source system.

First claim

The invention claimed is:

1. A display system, comprising:
a light source system comprising a light source array formed from light source units, the light source array being configured to emit light beams and being divided into I×J sub-regions;
a display unit disposed on a light emergent path of the light source system and configured to modulate a light spot on a surface thereof based on a light spot modulation signal to generate image light; and
a dynamic control module configured, based on an image signal and dynamically updated information of the light source units including chromaticity information, maximum brightness information, and a correlation curve between a modulation current and a brightness, to obtain the light spot modulation signal and a current modulation signal for modulating the light source system,
wherein the dynamic control module comprises:
a color correction part configured to obtain a light source correction signal through a white balance correction based on the chromaticity information and the maximum brightness information of each of the light source units, wherein the light source correction signal comprises a brightness value of each light source unit group of the light source unit groups when the light source unit group achieves a maximum brightness white point, wherein the light source unit groups are formed by the light source units;
a local dimming part configured to obtain a local dimming signal of the light source system based on the image signal and the light source correction signal;
a display modulation part configured to obtain the light spot modulation signal based on the image signal, the light source correction signal and the local dimming signal; and
a light source modulation part configured to obtain the current modulation signal of the light source system based on the local dimming signal, the light source correction signal and the correlation curve between the modulation current and the brightness of each of the light source units; and
wherein the color correction part is further configured to balance the maximum brightness with which each light source unit group of the light source unit groups is capable of achieving white point in such a manner that each part of an image has a uniform brightness only when the display system displays a full white field.

2. The display system according to claim 1 , wherein at least two light source units of the light source units are arranged in each of the I×J sub-regions, and have at least two colors; the local dimming part is configured to calculate a brightness modulation signal of each of the at least two colors based on the image signal and a color gamut combined by the at least two light source units of the at least two colors within a corresponding sub-region of the I×J sub-regions, to take a maximum value of the brightness modulation signal of each of the at least two colors as a target brightness value of each dimming region of each display unit, so as to obtain the local dimming signal of the light source system based on the light source correction signal again.

3. The display system according to claim 1 , wherein each light source unit group of the light source unit groups comprises at least two of the light source units that have at least two colors, and is a minimum unit capable of achieving a white point spatially.

4. The display system according to claim 2 , wherein the at least two light source units of the at least two colors within the corresponding sub-region are light source units of the at least two colors that each are configured to emit light with a maximum wavelength within the corresponding sub-region and light source units of the at least two colors that each configured to emit light with a minimum wavelength in the corresponding sub-region.

5. The display system according to claim 1 , wherein each of the I×J sub-regions of the light source array is configured for primary illumination of one of a plurality of image partitions of an image to be displayed, wherein each of the plurality of image partitions comprises a plurality of pixels, and wherein the display unit comprises a plurality of dimming regions corresponding to the plurality of image partitions in one-to-one correspondence.

6. The display system according to claim 1 , wherein the light source array is one of an electroluminescent sheet array, a cold cathode fluorescent lamp array and a light emitting diode array, and wherein the display unit is a liquid crystal panel.

7. The display system according to claim 1 , wherein the light source array is one of a laser light source array and a light emitting diode array, and wherein the display unit is a spatial light modulator.

8. The display system according to claim 1 , wherein the light source system further comprises a wavelength conversion device disposed on an optical path between the light source array and the display unit, wherein the wavelength conversion device comprises a wavelength conversion region configured to absorb at least part of light emitted from the light source array and to emit excited light.

9. The display system according to claim 8 , wherein the light source array is arranged randomly.

10. The display system according to claim 8 , wherein the wavelength conversion device further comprises a scattering region.

11. The display system according to claim 10 , wherein the scattering region has a diffusion degree not lower than that of the wavelength conversion region.

12. The display system according to claim 8 , wherein a chromaticity coordinate value of one of the light source units of the excited light is a certain fixed value taken within its chromaticity range, and wherein the chromaticity information of the light source unit comprises the chromaticity coordinate value of the light source unit.

13. The display system according to claim 1 , wherein a chromaticity coordinate value of one of the light source units of the light source array is a certain fixed value taken within its chromaticity range, and wherein the chromaticity information of the light source unit comprises the chromaticity coordinate value of the light source unit.

14. The display system according to claim 1 , further comprising:
a light homogenizing device disposed between the light source system and the display unit and configured to homogenize the light beams emitted by the light source system.

15. The display system according to claim 3 , wherein each light source unit group of the light source unit groups comprises a red laser light source unit, a green laser light source unit and a blue laser light source unit that are adjacent to each other, and is capable of achieving the white point through a light combining device.

16. A display system, comprising:
a light source system comprising a light source array formed from light source units, the light source array being configured to emit light beams and being divided into I×J sub-regions, wherein at least two light source units of the light source units are arranged in each of the I×J sub-regions, and have at least two colors;
a display unit disposed on a light emergent path of the light source system and configured to modulate a light spot on a surface thereof based on a light spot modulation signal to generate image light; and
a dynamic control module configured, based on an image signal and dynamically updated information of the light source units including chromaticity information, maximum brightness information, and a correlation curve between a modulation current and a brightness, to obtain the light spot modulation signal and a current modula

Assignees

• Appotronics Corp Ltd

Inventors

• Wu Chao
• Yu Xin
• Hu Fei
• Li Yi

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G3/342

  using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines · CPC title

• G09G3/002

  to project the image of a two-dimensional display, such as an array of light emitting or modulating elements or a CRT · CPC title

• H05B44/00

  Circuit arrangements for operating electroluminescent light sources (for operating light emitting diodes H05B45/00) · CPC title