Testing method for light spread function template of LED zone backlight
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A technology of light diffusion function and diffusion plate, which can be used in instruments, static indicators, etc., and can solve the problems of large computational load, high computational complexity, and lack of operability.
Active Publication Date: 2013-11-20
合肥泰沃达智能装备有限公司
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This method not only has a large amount of calculation, high computational complexity, and low precision, which affects the quality of the displayed image; but also because dynamic dimming is applied to liquid crystal displays, if it is necessary to obtain an accurate light diffusion function template, it is necessary to adjust the backlight of the display. Disassemble the source, and then actually test the light-emitting mode of each part, which is not operable
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Embodiment 1
[0054] The tested liquid crystal display has applied the LED partition dynamic dimming algorithm, its diagonal size is 32 inches, the screen resolution is 1080×1920 pixels, the partition backlight is 4×8, and there are 4 rows and 8 columns partitions in total. Each partition contains 270×240 pixels, that is, the partition is a vertical rectangle.
[0055] The specific operation steps of LED partition backlight light diffusion function template test are as follows:
[0056] 1. Put the liquid crystal display 1 on the two-dimensional motion platform 4, and align the chromaticity and brightness meter 2 with the center of the liquid crystal display panel 102;
[0057] 2. The brightness of the backlight is divided according to the commonly used 8-bit 256 steps, that is, the lowest brightness is 0 and the highest brightness is 255. The backlight driving control circuit board 102 generates a driving signal with the highest brightness of 255 for all partitioned backlight LEDs, and sen...
Embodiment 2
[0082] The tested liquid crystal display applied the dynamic dimming algorithm of LED partitions, its diagonal size was 18.5 inches, the screen resolution was 768×1024 pixels, the partition backlight was 6×8, and there were 6 rows and 8 columns partitions in total. Each partition contains 128×128 pixels, that is, the partition is a square.
[0083] The specific operation steps of LED partition backlight light diffusion function template test are as follows:
[0084] 1. Put the liquid crystal display 1 on the two-dimensional motion platform 4, and align the chromaticity and brightness meter 2 with the center of the liquid crystal display panel 102;
[0085] 2. The brightness of the backlight is divided according to the commonly used 8-bit 256 steps, that is, the lowest brightness is 0 and the highest brightness is 255. The backlight driving control circuit board 102 generates a driving signal with the highest brightness of 255 for all partitioned backlight LEDs, and sends them...
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Abstract
The invention discloses a testing method for a light spread function template of an LED zone backlight. The method adopts a liquid crystal display capable of dimming dynamically in zones, a chroma luminance meter, a computer and a two-dimensional motion tripod head and comprises the following steps: specific luminance of zone backlight of each LED is set; the practical luminance of each zone on an LCD panel, corresponding to the zone backlight, is tested with the chroma luminance meter; the tested practical luminance data is correspondingly plugged into an automation solution program MATLAB in a computer to obtain an equation set of light spread function template parameters; the light spread function template parameters are solved eventually. The testing method has the advantages as follows: the method is wide in application range; an LED backlight source can be a direct light type source positioned below a backlight module or a side light type source positioned on a side of the backlight module, and can be variable forms positioned at all zone backlight source positions; a testing hardware system is simple in structure, convenient in construction and strong in operability; a MATLAB program is adopted for automation solution, so that the computing speed is high, and the precision is high.
Description
technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to the dynamic dimming technology of LED backlight areas. Background technique [0002] The liquid crystal itself does not emit light, and needs a backlight to provide light to illuminate the display area. The backlight module mainly includes a backlight source, a reflective film, a light guide plate, a diffusion film (plate), and a brightness enhancement film. Light Emitting Diode (LED) is replacing Cold Cathode Fluorescent Tube (Cool Cathode Florescent Lamp, CCFL) as the mainstream backlight source for LCD. The light emitted by the LED light source passes through the diffusion film (plate) and becomes a surface light source with uniform brightness. The light diffusion function describes the light transmission performance of the light emitted from the LED and incident on the LCD screen after being diffused by multiple diffusion films (plates). [0003] Dynamic dim...
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