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Laser projection picture brightness adjusting method and device

A technology of laser projection and brightness adjustment, which is applied in the field of television, can solve problems such as inability to adjust the brightness of the screen, long-term data accumulation and experimental measurement, and unstable brightness, so as to achieve the effect of improving the picture quality

Active Publication Date: 2016-05-11
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, the laser is the basic light-emitting device of the laser light source. The power of the laser affects the brightness of the light source beam, thereby affecting the brightness of the picture displayed on the laser projection screen. However, the laser will be affected by environmental factors such as ambient temperature and dust during use. Affected, there may be brightness attenuation or other unstable brightness
[0005] In the prior art, the brightness of the picture displayed on the laser projection screen is usually adjusted in the following way: obtain the picture brightness curve in the laser projection screen within a preset time length, when the attenuation of the picture brightness curve in a preset time length When the brightness is greater than the preset threshold, the power of the laser is changed to the preset power to adjust the brightness value of the display screen on the laser projection screen to the desired constant brightness. However, in the prior art, due to the The brightness curve of the screen to adjust the brightness of the screen requires a long time of data accumulation and experimental measurement, and the change of the screen brightness cannot be adjusted in time, which makes the picture quality poor and reduces the user viewing experience

Method used

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  • Laser projection picture brightness adjusting method and device
  • Laser projection picture brightness adjusting method and device
  • Laser projection picture brightness adjusting method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0030] figure 1 For the structural schematic diagram of the laser projection system provided by the embodiment of the present invention, please refer to figure 1 , the laser projection system includes a laser 101, a beam processing unit 102, a digital micromirror chip 103, a DMD image processing unit 104, a projection lens 105, and a laser projection screen 106, and the beam processing unit 102 processes the laser beam generated by the laser 101 to obtain a light source Beam, for example, the beam processing unit 102 performs beam shaping to the laser beam generated by the laser 101, mixes the laser beam and the fluorescent beam to obtain a light source beam, and the light source beam is irradiated to the digital micromirror chip 103 (DMD), and the DMD103 according to the DMD image The processing unit controls the processing results of the image to be displayed (such as the eigenvalues ​​of each pixel in the image to be displayed), and controls each reflector inside the DMD103...

Embodiment 2

[0045] On the basis of Embodiment 1, the first brightness value ( figure 2 S201) in the embodiment, below, by image 3 The embodiment shown is a detailed description of a feasible implementation of S201. For details, please refer to image 3 Example shown.

[0046] image 3 It is a flow chart of the method for obtaining the first brightness value of the light beam used to display the image to be displayed provided by the present invention. The execution subject of the method is a brightness adjustment device. Please refer to image 3 , the method can include:

[0047] S301. Obtain the brightness value of the light beam reflected by the light source beam to the light absorption unit through at least one reflection unit;

[0048] S302. Acquire a first brightness value according to the number of reflecting units, the brightness value of the light beam reflected to the light absorbing unit, and the brightness value of the light source beam.

[0049] exist image 3 In the il...

Embodiment 3

[0060] On the basis of any of the above-mentioned embodiments, it can be realized in many feasible ways figure 2 S204 in the shown embodiment, below, by Figure 5 The illustrated embodiment describes in detail a feasible implementation of obtaining the grayscale value of the picture to be displayed in S204. For details, please refer to Figure 5 Example shown.

[0061] Figure 5 It is a flow chart of the method for obtaining the grayscale value of the image to be displayed provided by the present invention. The execution subject of the method is a brightness adjustment device. Please refer to Figure 5 , the method can include:

[0062] S501. Acquire a picture to be displayed, and convert the picture to be displayed into a grayscale image;

[0063] S502. Obtain the grayscale value of each pixel in the grayscale image;

[0064] S503. Acquire the average value of the gray scale values ​​of each pixel, and use the average value of the gray scale values ​​of each pixel as th...

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Abstract

An embodiment of the invention provides a laser projection picture brightness adjusting method and device. The method comprises the following steps: obtaining a first brightness value for displaying light beam of a picture to be displayed, wherein the picture to be displayed is any picture displayed in a laser projection screen; judging whether the first brightness value is larger than a preset threshold value; if so, turning off a laser; and if not, obtaining a gray-scale value of the picture to be displayed and a second brightness value matched with the gray-scale value, and adjusting the brightness of the light beam of a light source according to the first brightness value and the second brightness value to enable the brightness value for displaying the light beam of the picture to be displayed to be equal to the second brightness value. The adjusting method and device are used for adjusting the brightness of the picture displayed on the laser projection screen in time.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of televisions, and in particular to a method and device for adjusting brightness of a laser projection screen. Background technique [0002] With the continuous improvement of science and technology, laser projection technology has been widely used. In laser projection technology, the image to be played is displayed on the laser projection screen by signal modulation of the laser light source beam. [0003] The core component of the laser projection technology is a digital micromirror chip (Digital Micromirror Devices, referred to as DMD). In the DMD, there are multiple reflectors arranged in an array, and each reflector corresponds to a pixel in the laser projection screen. In the actual working process, after the light source beam is irradiated on each reflector, the controller controls each reflector according to the characteristic value of each pixel in the image to be displayed, s...

Claims

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Application Information

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IPC IPC(8): G09G3/00G09G5/10
CPCG09G3/001G09G5/10
Inventor 黄顺明毕春光曹建伟
Owner HISENSE VISUAL TECH CO LTD
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