Method and device for calibrating display contrast in high brightness environment

A calibration method and technology for calibrating devices, which are applied to static indicators, cathode ray tube indicators, instruments, etc., can solve the problems of lack of calibration traceability for measurement results, increased device costs, and inability to achieve direct solar illuminance levels, etc. To achieve excellent repeatability and stability, to achieve the effect of calibration

Active Publication Date: 2017-01-04
中电科计量检测认证(北京)有限公司
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Problems solved by technology

[0004] The existing display bright room contrast measurement device and method are as follows: 1. When the size of the measured display is large, the diameter of the integrating sphere required for the measurement also needs to be increased, and the cost of the device will be doubled; 2. The size of the device The measurement results do not have a calibration and traceability method, and the accuracy and reliability of the value cannot be guaranteed; 3. Using the light source in a single integrating sphere as an environmental lighting device cannot achieve the output of the illuminance level of direct sunlight at high altitude; 4. The measured display and measuring instruments The position is fixed, resulting in a single geometric condition of the incident light source, and the observation angle of the measuring instrument is fixed

Method used

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  • Method and device for calibrating display contrast in high brightness environment
  • Method and device for calibrating display contrast in high brightness environment
  • Method and device for calibrating display contrast in high brightness environment

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Embodiment 1

[0034] The present invention provides a display contrast calibration method in a high-brightness environment, which includes the following steps:

[0035] Step 1: Fix a set of standard reflectors on the measuring table, and use corresponding light sources to illuminate the center positions of different reflectors according to the needs of calibration. The brightness of the central positions of different reflectors is measured by a luminance meter, and the differences between different reflectors are compared. Calculate the brightness contrast between reflectors;

[0036] Step 2: Using the reflectance value of the calibrated standard reflector, calculate the standard reflectance contrast between different reflectors, and calibrate the brightness contrast measured by the photometer to obtain the contrast calibration under different measurement ranges factor;

[0037] Step 3: Fix the tested display on the measuring table, use the positioning laser marking line to confirm that the displ...

Embodiment 2

[0047] On the basis of the above embodiments, the above method is applied and the present invention also provides a display contrast calibration device in a high-brightness environment, such as figure 1 As shown, it includes a measuring table 101 where a display is placed, a positioning laser marking line, a standard reflector 103, a diffuse environmental light source 106, a mirror light source 104, a diffuse integrating sphere light source 107, a direct light source 105, a luminance meter, and a luminance meter platform 108; The measurement table 101 where the display is placed is used to ensure that the display center of the flat-panel displays 102 of various sizes to be measured is located at the center of the measurement table 101 where the display is placed; the positioning laser marking line is used to prompt the measured display 102, Place the standard reflector 103 and ensure that the position of the display surface remains unchanged during the measurement; the standard r...

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Abstract

The invention provides a display contrast calibration method and device in a high-brightness environment. The high-brightness environment is simulated through a direct light source, a mirror light source, a diffuse ambient light source, and a diffuse integrating sphere light source. The displacement mechanism can calibrate and measure the contrast ratio of the display under various complex high-brightness lighting conditions. Using the above scheme, by installing a standard reflector on the fixed platform of the display, and using the calibrated standard reflector to calibrate the measurement results of the calibration device, the traceability of the contrast parameters of the display by the device can be realized, and the measurement results can be guaranteed. Has excellent repeatability and stability.

Description

Technical field [0001] The invention belongs to the technical field of display contrast calibration, and in particular relates to a display contrast calibration method and device in a high-brightness environment. Background technique [0002] Contrast parameter is an important indicator of the display. Manufacturers often use darkroom contrast when testing and advertising this parameter, that is, the result of measurement in an optical darkroom, and the brightness value and display of the white field are obtained through measurement. The ratio of the brightness values ​​of the black field is used as the contrast. However, the display is not in a dark room when it works. With the continuous development of display technology, various types of displays are widely used in portable mobile devices, vehicle-mounted or airborne electronic devices, and outdoor advertising screens. The strong ambient background radiation illuminates the screen surface. Due to the limited dynamic range of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02G09G5/10
Inventor 王国权孙权社朱兴邦赵发财王少水郑祥亮韩忠
Owner 中电科计量检测认证(北京)有限公司
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