In recent years, the brightness of LED display has become a more acute problem in the industry. It is particularly important for LED display manufacturers to design a product that can automatically adjust the brightness. The LED display screen automatically adjusts the brightness and needs to master four core technologies.
1, LED is a green light source, its main advantage is high luminous efficiency. With the development of materials science, the luminous efficiency will be greatly improved in the next 10 years; low energy consumption, long service life, recyclable materials, and no environmental pollution. Although our country started relatively late, in recent years it has also begun active research and development as well as industrial policies and support. Leadership differs significantly from incandescent lamps in that the luminosity and the forward current flowing through the LEDs are approximately proportional to the size. Using this feature, the optical sensor measures the brightness of the surrounding environment, changes the brightness of the emitted light according to the measured value, and maintains the influence of changes in the brightness of the surrounding environment. This not only creates a comfortable environment with constant brightness, but it can also make full use of natural daylight and greatly save energy. Therefore, research on LED adaptive dimming technology is particularly important.
2, the basic principle: The design uses the column to send data, line scan to achieve LED display text or images. The method and the hardware circuit combine to achieve the purpose of relatively uniform brightness of the electronic display screen. The use of photosensitive resistance of the sensitive characteristics of ambient light, the collection of changes in ambient light conditions, will be converted into electrical signals and sent to the microcontroller, the signal processing by the microcontroller, and in accordance with certain laws to control the output PWM wave duty cycle. A switch voltage regulator circuit is added between the single chip microcomputer and the LED electronic display screen to realize the brightness adjustment of the electronic display screen by the single chip microcomputer. The adjusted PWM wave is used to control the switching regulator circuit, so as to adjust the input voltage of the electronic display screen, and ultimately realize the brightness control of the electronic display screen.
3. An adaptive brightness control circuit for an electronic display of a light emitting diode, comprising: a duty ratio preset value input device, a counter, and a size comparator, wherein the counter and the duty ratio preset value input device are respectively A count value and a preset value of the duty cycle are input to the size comparator to control the comparator output value.
4, LED adaptive dimming system hardware design LED brightness and positive current flowing through it is proportional to the size of the forward current can be adjusted to adjust the brightness of the LED. Nowadays, the brightness of LEDs is generally adjusted by adjusting the operating current mode or pulse width modulation. The former has a large range of adjustment and good linearity, but consumes large amounts of power. So rarely used. The pulse width modulation method is to switch the LED with a higher frequency, and the switching frequency is beyond the range that people can detect, so that people do not feel the existence of strobe. LED adaptive dimming is achieved.
Good technology will share with everyone, unite all LED display manufacturers, and jointly promote the healthy and rapid development of the entire industry to provide users with satisfactory products. Text / Shenzhen LED base
1, LED is a green light source, its main advantage is high luminous efficiency. With the development of materials science, the luminous efficiency will be greatly improved in the next 10 years; low energy consumption, long service life, recyclable materials, and no environmental pollution. Although our country started relatively late, in recent years it has also begun active research and development as well as industrial policies and support. Leadership differs significantly from incandescent lamps in that the luminosity and the forward current flowing through the LEDs are approximately proportional to the size. Using this feature, the optical sensor measures the brightness of the surrounding environment, changes the brightness of the emitted light according to the measured value, and maintains the influence of changes in the brightness of the surrounding environment. This not only creates a comfortable environment with constant brightness, but it can also make full use of natural daylight and greatly save energy. Therefore, research on LED adaptive dimming technology is particularly important.
2, the basic principle: The design uses the column to send data, line scan to achieve LED display text or images. The method and the hardware circuit combine to achieve the purpose of relatively uniform brightness of the electronic display screen. The use of photosensitive resistance of the sensitive characteristics of ambient light, the collection of changes in ambient light conditions, will be converted into electrical signals and sent to the microcontroller, the signal processing by the microcontroller, and in accordance with certain laws to control the output PWM wave duty cycle. A switch voltage regulator circuit is added between the single chip microcomputer and the LED electronic display screen to realize the brightness adjustment of the electronic display screen by the single chip microcomputer. The adjusted PWM wave is used to control the switching regulator circuit, so as to adjust the input voltage of the electronic display screen, and ultimately realize the brightness control of the electronic display screen.
3. An adaptive brightness control circuit for an electronic display of a light emitting diode, comprising: a duty ratio preset value input device, a counter, and a size comparator, wherein the counter and the duty ratio preset value input device are respectively A count value and a preset value of the duty cycle are input to the size comparator to control the comparator output value.
4, LED adaptive dimming system hardware design LED brightness and positive current flowing through it is proportional to the size of the forward current can be adjusted to adjust the brightness of the LED. Nowadays, the brightness of LEDs is generally adjusted by adjusting the operating current mode or pulse width modulation. The former has a large range of adjustment and good linearity, but consumes large amounts of power. So rarely used. The pulse width modulation method is to switch the LED with a higher frequency, and the switching frequency is beyond the range that people can detect, so that people do not feel the existence of strobe. LED adaptive dimming is achieved.
Good technology will share with everyone, unite all LED display manufacturers, and jointly promote the healthy and rapid development of the entire industry to provide users with satisfactory products. Text / Shenzhen LED base
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