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Displaying device and its light regulation method

A technology for a display device and an adjustment method, which is applied in projection devices, identification devices, image reproducers using projection devices, etc., and can solve problems such as poor image quality, inability to obtain sufficient contrast, and inability to adjust white light source light

Inactive Publication Date: 2004-10-27
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] (1) Sufficient contrast cannot be obtained due to light leakage or scattered light occurring in several optical elements constituting an optical system
That is, the displayable luminance range (dynamic range) is narrow, and the image quality is inferior compared to existing image monitors using cathode ray tubes (hereinafter referred to as CRTs)
[0004] (2) Although image quality improvement is sought through various image signal processing, due to the fixed dynamic range, it is impossible to exhibit sufficient effects
[0010] Although the technology described in Patent Document 2 is adopted, the light emission spectrum of white light sources varies complicatedly, requiring a large-scale correction circuit
Furthermore, in the case where there is a deflection in the color distribution of a displayed image, effective light adjustment cannot be performed in a white light source, and thus a sufficient effect cannot be obtained by light adjustment.

Method used

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  • Displaying device and its light regulation method
  • Displaying device and its light regulation method
  • Displaying device and its light regulation method

Examples

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no. 1 example

[0071] figure 1 is a schematic configuration diagram of a projection type display device, which is the first embodiment of the display device according to the present invention. figure 1 The projection type display device 30 shown in includes light sources 2R, 2G, and 2B, each of which can emit different colored light components; liquid crystal light valves (light valves) (light modulation devices) 22 to 24; dichroic prisms 25 and projection system 26 . Reference numeral 27 is a screen on which images are projected and displayed.

[0072] The light source 2R comprises a lamp 7R for emitting a red light component LR and a reflector 8 for reflecting the light of said lamp 7R. The light source 2G comprises a lamp 7G for emitting a green light component LG and a reflector 8 for reflecting the light of said lamp 7G. The light source 2B includes a lamp 7B for emitting a blue light component LB and a reflector 8 for reflecting light from said lamp 7B. The lamps 7R, 7G and 7B incl...

no. 2 example

[0114] Next, refer to Figure 7 A second embodiment of the present invention will be described. The display device of this embodiment is a projection display device, which includes figure 1 The same optical system as the projection type display apparatus of the first embodiment shown in the first embodiment, and a Figure 7 The drive circuit shown in .

[0115] Figure 7 is a block diagram of the projection type display device according to the present embodiment, and figure 2 The difference in the block diagram shown in is that an image analysis unit 44 replaces the image analysis unit 34, and a plurality of light control signals from the image analysis unit 44 are supplied to the light control drivers 15 to 17.

[0116] The image analysis unit 44 according to the present embodiment is Figure 8 includes a structure representing a block diagram thereof, and includes frequency curve generating units 36a to 36c for generating each frequency curve from an R signal, a G sign...

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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.

Description

technical field [0001] The invention relates to a display device and a light adjustment method thereof. Background technique [0002] Conventional projection type display devices have the following problems. [0003] (1) Sufficient contrast cannot be obtained due to light leakage or scattered light occurring in several optical elements constituting one optical system. That is, the displayable luminance range (dynamic range) is narrow, and the image quality is inferior compared with existing image monitors using cathode ray tubes (hereinafter referred to as CRT). [0004] (2) Although improvement in image quality is sought through various image signal processing, it is impossible to exhibit sufficient effects due to a fixed dynamic range. [0005] As a solution to the problems associated with such projection type display devices, ie, a method of expanding the dynamic range, it may be considered to change the flux of light components incident to the light modulation device (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13G02B27/18G02F1/133G03B21/00G03B21/14G03G17/04G09F9/00G09G3/18G09G3/20G09G3/34G09G3/36H04N9/31
CPCH04N9/3197H04N9/3182H04N9/315
Inventor 吉田升平饭坂英仁
Owner SEIKO EPSON CORP
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