Projector brightness adjustment system and brightness adjustment method
A technology of brightness adjustment and projector, applied in the direction of instruments, energy-saving control technology, projection devices, etc., can solve the problems of inability to adapt to environmental changes, and the brightness of the screen cannot be automatically adjusted, so as to achieve the effect of good user experience.
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Embodiment 1
[0032] like figure 1 and figure 2 As shown, the projector brightness adjustment system of the present invention is applied to a projector, and in the brightness adjustment process, brightness detection and adjustment are performed in conjunction with the projector's projection lens, external projection interface and ambient light.
[0033] The projector brightness adjustment system of the present invention includes a light sensing module, a main control module and a brightness output module. The main control module is arranged on the main board of the projector, and the main control module is a microcontroller MUC (Microcontroller Unit), which changes the brightness of the projector by controlling and changing the output value of the brightness output module. The brightness output module is a power constant current board, which can output a constant current power supply to supply the light source under the control of the main control module, so as to realize the brightness c...
Embodiment 2
[0044] refer to Figure 3 to Figure 4 As shown, it is the second embodiment of the present invention, which is basically the same in principle as the first embodiment, except that in this embodiment, the projection lens is also provided with a camera, and the control system further includes and The image acquisition and processing module connected to the camera, the image acquisition and processing module records and processes the pictures taken by the camera, and inputs the processing results into the main control module. The main control module stores the image model and the ratio of the image model to the output value of the power constant current board relation. Specifically in this embodiment, the image acquisition and processing module is an image acquisition and processing chip.
[0045] The calculation process of the proportional relationship in the laboratory is: let the number of light sensors be n,
[0046] When the power of the electric light is W1, at this time,...
Embodiment 3
[0057] refer to Figure 5 to Figure 6 As shown, it is the third embodiment of the present invention, which is roughly the same as the first two embodiments, except that in this embodiment, the brightness output module is a light modulator arranged in the projection lens, and the light modulator is arranged in There is a photoelectric crystal, and the main control module adjusts the brightness of the projector by controlling the voltage applied to the photoelectric crystal.
[0058] According to the principle of the electro-optical modulator, when the voltage applied to the electro-optical crystal is adjusted, the refractive index N of the electro-optical crystal in the electro-optical modulator will be changed, which will cause the change of the light wave characteristics through the crystal and realize the adjustment of the light intensity. . In the laboratory test, the proportional relationship between the collected average value of the multiple light sensors and the voltag...
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