Display Device and Light Adjusting Method Thereof

• US 20100060556A1
• Filed: 11/16/2009
• Published: 03/11/2010
• Est. Priority Date: 04/23/2003
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: IISAKA, Hidehito, YOSHIDA, Shohei
• Application Number:
  US12/619,179
• Publication Number:
  US 20100060556A1
• Time in Patent Office: Days
• US Class Current: 345/83
• 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 for displaying an image in accordance with an image signal, comprising:

a plurality of light emitting diodes, each of which outputs different colored light components;

an image analyzing device adapted to analyze the image signal, output a plurality of light control signals for controlling an output of each of the light emitting diodes, and calculate an expansion coefficient for expanding an amplitude of the image signal;

a light control device adapted to receive the light control signals and control the output of each of the light emitting diodes based on the light control signals;

an expansion processing unit adapted to expand the amplitude of the image signal based on the expansion coefficient calculated by the image analyzing device; and

a light modulating device adapted to modulate each of the colored light components in accordance with the image signal, the amplitude of which has been expanded.

2. The display device according to claim 1,

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

3. The display device according to claim 1,

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

4. The display device according to claim 1,

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.

5. The display device according to claim 1,

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

6. The display device according to claims 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.

7. An image display method for displaying an image in accordance with an image signal, comprising:

providing a plurality of light emitting diodes, each of which outputs different colored light components;

analyzing the image signal;

outputting a plurality of light control signals for controlling an output of each of the light emitting diodes based on analysis;

calculating an expansion coefficient for expanding an amplitude of the image signal;

controlling the output of each of the light emitting diodes based on the light control signal;

expanding the amplitude of the image signal based on the expansion coefficient; and

modulating each of the colored light components in accordance with the image signal, the amplitude of which has been expanded.

8. The light adjusting method of a display device according to claim 7,

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