Method and device for displaying image by reducing power consumption

Abstract

The invention relates to a method and a device for displaying image by reducing power consumption. On the basis of little appearance opportunity of a large high-brightness pure white area in an image, an image analyzer is additionally provided on the basis of the prior projection display system, image data is analyzed by using a frame as a unit so as to ensure a multiplication number of various kinds of fundamental color data, control signals which are relative to the image data and the multiplication number are output to a light source so as to reduce and regulate the output power of fundamental color light beams, the fundamental color data of the image data can be correspondingly controlled, magnified and regulated, and thereby under the premise that the display image is not affected inthe brightness and the contrast ratio, the power consumption of the projection display system is greatly reduced. The display contrast ratio of the system can be improved by adopting the method and the device for displaying image and an LED light source.

Description

technical field [0001] The present invention relates to image communication, and in particular, to an image display method and device in a projection device for color image display. Background technique [0002] In the field of image projection, such as (but not limited to) involving rear projection televisions (RPTV) or front projectors, light source application technology has become more and more mature. While the prior art provides variable color light sources for the field, the light sources are continuously optimized for performance, structure or cost. [0003] In view of the advantages of solid-state light sources, such as semiconductor light-emitting diodes (Light Emitting Diodes, LEDs), which have the advantages of long service life, low power consumption, and adjustable wavelength, with the continuous emergence of various new high-power and high-brightness LEDs, LED light sources in the above fields. more and more applications. [0004] A typical projection displa...

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Problems solved by technology

[0008] The disadvantage of the above-mentioned prior art lies in that: as the display screens and brightness of the existing projection market are getting higher and higher, the requirements of the projection system for the power of the light source are also getting higher and higher; although the projection display system disclosed in the above-mentioned patent application can improve the projected image Brightness and contrast, but cannot reduce system power consumption like other existing projection systems

In particular, after the UHP lamp is turned off, it takes a long time to light up again, so in general, the UHP lamp needs to keep the brightness constant or change little, so that when corresponding to a pure black image in this scheme, It is impossible for the screen to be completely dark, that is, it is impossible for this solution to achieve an ideal screen contrast ratio of 1:0

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