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Method for obtaining brighter images from an led projector

A technology for projecting images and brightness, applied in the field of adaptive technology, which can solve problems such as degradation, image fading, impossible reproduction, etc.

Active Publication Date: 2012-09-05
SPATIAL PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this superposition reduces the ability to display pure reds, greens, or blues, thereby making it difficult or impossible to reproduce fully saturated images
Desaturating too much can result in washed out images

Method used

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  • Method for obtaining brighter images from an led projector
  • Method for obtaining brighter images from an led projector
  • Method for obtaining brighter images from an led projector

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Embodiment Construction

[0020] The content-adaptive approach described herein for increasing image brightness provides significant brightness increases while minimizing the visual impact of saturation loss. Briefly, content-adaptive brightness control uses an algorithm to create a histogram for adjusting the color saturation and brightness values ​​of the incoming image data on a frame-by-frame basis. This method adjusts the amount of overlap of the three LED light sources according to the histogram value of the maximum saturation / brightness. Where the Max Saturation value is low, the amount of overlap can be increased, making the light source brighter. However, increasing the amount of overlap narrows the gamut triangle of the image. A narrowed gamut triangle desaturates the image and can cause washed out colors on the display. The disclosed method modifies display data to increase brightness and saturation, compensating for picture color, but still avoiding desaturation enough to wash out the ima...

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Abstract

A method for improving brightness of projected images from an LED projector employing a plurality of LEDs of different colors by determining, from a histogram of a frame of an image to be projected, an effective maximum saturation. A plurality of main channels and a plurality of subchannels are created, one main channel and at least one subchannel for each color LED. Then the amplitude of the main channel and a subchannel for each color are determined based upon the effective maximum saturation of the frame of the image, followed by using the main channel and the at least one subchannel for a color to drive an LED of that color to generate the image.

Description

technical field [0001] The present invention relates to the field of LED digital projectors, and more particularly to adaptive techniques for increasing the brightness of the projected images of those projectors. Background technique [0002] Table-top and ceiling-mount digital projectors, for example, for business use, have been around for a long time. Their size has decreased over time, and their projected images have become brighter. Until recently, most of these projectors used UHP (Ultra High Performance) lamps as their illumination source, but many projectors are now using LEDs as their light source. [0003] The digital images projected by these projectors are created by passing light from LEDs through a spatial light modulator (SLM). Two types of SLMs are LCOS, which uses liquid crystal technology, and micromirror devices, which use tiny mirrors formed on silicon substrates with digital control electronics. Typically, a micromirror device has one mirror for each p...

Claims

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Application Information

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IPC IPC(8): H04N9/31G03B21/00G03B21/14G03B21/20
CPCH04N9/3111H04N9/3164H04N9/3182
Inventor 石井隆俊
Owner SPATIAL PHOTONICS