Display device and light adjusting method thereof

• US 20040248022A1
• Filed: 04/06/2004
• Published: 12/09/2004
• Est. Priority Date: 04/23/2003
• Status: Active Grant

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Yoshida, Shohei, Iisaka, Hidehito
• Granted Patent: US 7,639,220 B2
• Time in Patent Office: Days
• US Class Current: 430/32
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20
• CPC Class Codes: H04N 9/3182 Colour adjustment, e.g. white balance, shading or gamut white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607

Abstract

The invention provides a display device and a light adjusting method thereof capable of carrying out light adjustment effectively by the output control of a light source and, preferably, of effecting light adjustment according to color distribution of a displayed image. The display device of the invention that is capable of adjusting a displayed image by changing light flux can include a plurality of light sources having light emitting diodes, an image analyzing unit for outputting a light control signal for controlling the output of each of the light sources, based on an image signal of the displayed image, and a light control device for controlling the output of each of the light sources based on the light control signals.

Claims

1. A display device capable of adjusting a displayed image by changing an illuminating light flux, comprising:

a plurality of light sources having light emitting diodes;

an image analyzing device that outputs a light control signal that controls an output of each of the light sources based on an image signal of the displayed image; and

a light control device that controls the output of each of the light sources based on the light control signals.

2. The display device according to claim 1,

the image analyzing device outputting the light control signal based on an average of the image signal inputted in a predetermined period.

3. The display device according to claim 1,

the image analyzing device outputting the light control signal based on a maximum of the image signal inputted in a predetermined period.

4. The display device according to claim 1,

the image analyzing device outputting the light control signal based on a luminance distribution of the image signal inputted in a predetermined period.

5. The display device according to claim 1,

a signal resolution of the light control signal inputted to the light control device being made different according to a relative luminous efficiency of a colored light component outputted from the plurality of light sources.

6. The display device according to claims 5,

a signal resolution of the light control signal corresponding to a green colored light component among the colored light components outputted from the light source being larger than that of the light control signal corresponding to other colored light components.

7. The display device according to claim 1, further comprising an output correcting device that executes a signal correcting process on the image control signal in order to correct a white balance of the displayed image.

8. The display device according to claim 7,

the output correcting device further including a lookup table having output property information of each of the light sources.

14. The display device according to claim 1,

the image analyzing device being able to output an image control signal to modulate the image signal, and

the display device including an image processing device that modulates the image signal of the displayed image based on the image control signal.

9. A display device capable of adjusting a displayed image by changing an illuminating light flux, comprising:

a plurality of light sources having light emitting diodes and being capable of outputting different colored light components;

a light modulating device disposed correspondingly to each of the light sources that modulates each of the colored light components;

an image analyzing device that outputs a plurality of light control signals that controls an output of each of the light sources based on a color signal corresponding to each of the colored light components included in an image signal of the displayed image; and

light control device that controls an output of each of the light sources based on the light control signals.

10. The display device according to claim 9,

the image analyzing device outputting each of the light control signals based on an average of each of the color signals inputted in a predetermined period.

11. The display device according to claim 9,

the image analyzing device outputting each of the light control signals based on a maximum of each of the image signals inputted in a predetermined period.

12. The display device according to claim 9,

the image analyzing device outputting each of the light control signals based on a luminance distribution of each of the color signals inputted in a predetermined period.

13. The display device according to claim 9,

the image analyzing device setting each of the light control signals using different features for each of the color signals.

15. A light adjusting method of a display device capable of adjusting a displayed image by changing an illuminating light flux, comprising:

in order to control the amounts of light components irradiated from a plurality of light sources having light emitting diodes to a light modulating device,

an image analyzing step of outputting a light control signal that controls an output of each of the light sources based on an image signal of the displayed image; and

a light control step of controlling the output of each of the light sources based on the light control signals.

16. The light adjusting method of a display device according to claim 15,

the image analyzing step outputting the light control signal with different signal resolutions according to a relative luminous efficiency of a colored light component outputted from the light source.

17. The light adjusting method of a display device according to claim 15,

a white balance of the displayed image being adjusted by adjusting an output of each of the light sources when an output of the light source is controlled in the light control step.

18. A light adjusting method of a display device capable of adjusting a displayed image by changing an illuminating light flux, comprising:

in order to control an amounts of light components irradiated from a plurality of light sources having light emitting diodes for emitting different colored light components to a light modulating device disposed correspondingly to the plurality of light sources,

an image analyzing step of outputting a light control signal that controls the output of each of the light sources based on the color signal corresponding to each of the colored light components included in an image signal of the displayed image; and

a light control step of controlling the output of each of the light sources based on the light control signals.

19. The light adjusting method of a display device according to claim 18,

the light control signal being set based on different features for each of the color signals upon setting the light control signal in the image analyzing step.