Display device and display method

• US 20060214945A1
• Filed: 03/23/2006
• Published: 09/28/2006
• Est. Priority Date: 03/23/2005
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Uchiyama, Shoichi, Nakamura, Junichi, Nitta, Takashi, Asahi, Tsunemori
• Application Number:
  US11/386,926
• Publication Number:
  US 20060214945A1
• Time in Patent Office: Days
• US Class Current: 345/603
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• 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

A display device includes a luminance modulator and a color modulator which are formed of separate modulators. Herein, when, in order to reproduce an input signal, a luminance control signal of the luminance modulator and a color control signal of the color modulator are determined by the input signal, a three-dimensional look up table which is created on the basis of a measurement result relating to the color control signal corresponding to the predetermined luminance value is used, whereby the color control signal of the color modulator is determined by the input signal.

Claims

1. A display device comprising:

a luminance modulator modulates luminance component,

a color modulator modulates color component,

a signal processing unit, when the signal processing unit determine a luminance control signal of the luminance modulator and a color control signal of the color modulator from a input signal, determine the color control signal by using a three-dimensional look up table which is created on the basis of a measurement result relating to the color control signal corresponding to the predetermined luminance value.

2. The display device according to claim 1, the signal processing unit determines independently the luminance control signal without using the three-dimensional look up table.

3. The display device according to claim 2, the signal processing unit including;

a luminance determining unit determines the luminance control signal,

the luminance determining unit including;

a plurality of one-dimensional look up tables determines a plurality of the luminance signals corresponding to a respective elements included in an input signal, a maximum value determining unit receives output signals from the plurality of one-dimensional look up tables, and outputs a luminance signal having a maximum value of the plurality of luminance signals, the luminance signal having a maximum value being the luminance control signal.

4. The display device according to claim 1,

each grid point in the three-dimensional look up table holds a value of each element of a color control signal and a value of a luminance control signal;

and

both a luminance control signal of the luminance modulator and a color control signal of the color modulator are determined by the input signal, using this three-dimensional look up table.

5. The display device according to claim 1, a value in each table is determined by calculation using a matrix which represents a relation between each element of the input signal defined by individual color space in the display device and the color control signal.

6. A projector comprising:

a luminance modulator modulate luminance component,

a color modulator modulate color component,

a signal processing unit, when the signal processing unit determine a luminance control signal of the luminance modulator and a color control signal of the color modulator from a input signal, determine the color control signal by using a three-dimensional look up table which is created on the basis of a measurement result relating to the color control signal corresponding to the predetermined luminance value.

7. A display method of controlling a display device in which a luminance modulator and a color modulator are formed of separate modulators, wherein when, in order to reproduce an input signal, a luminance control signal of the luminance modulator and a color control signal of the color modulator are determined by the input signal, a three-dimensional look up table which is created on the basis of a measurement result relating to the color control signal corresponding to the predetermined luminance value is used, whereby the color control signal of the color modulator is determined by the input signal.