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How to achieve full-color LED display automatically adjusts brightness

Release date:2014-05-15


 

Full color LED display is very common in life , give our lives a lot of convenience. Because full-color LED display brightness can vary with ambient light , there is a clear day or night because of the display is too bright and dazzling problems. If you can achieve control its brightness can not only save energy , but also make full-color LED display screen more clearly.
Here, I will share full-color LED display brightness automatic brightness adjustment four core technologies:
1, LED is a green light , its main advantage is high luminous efficiency. With the development and progress of materials science , in luminous efficiency over the next 10 years there will be a more substantial increase ; low energy consumption, long life, recyclable materials , do not pollute the environment. Although our country started late , but in recent years have begun to actively research and development and industrial policy and support work. Compared with an incandescent lamp led significant differences: , brightness and luminous diode forward current flows through the size of a substantially proportional relationship. This feature uses it to measure the brightness of the surrounding environment through an optical sensor , based on the measured value changes in brightness, brightness changes to keep the surrounding environment , the construction work to divert people happy . This not only creates a comfortable environment for constant brightness , but can also take advantage of natural lighting , energy saving considerably . Therefore, the LED adaptive dimming technology research is particularly important.
2, the basic principle: The design uses to send data column , line scan way to achieve LED display text or image . This method is a combination of hardware circuitry to achieve the overall brightness of the display is relatively uniform electronic purposes . Photosensitive resistance to the sensitive nature of the use of ambient light , collecting change in ambient light conditions , it is converted into electrical signals and sent to the MCU , the MCU for signal processing and follow certain rules to control the duty cycle of the output PWM wave . Between the microcontroller and LED electronic display plus a switching regulator circuit, microcontroller for electronic display brightness adjustment . The adjusted PWM wave switching regulator control circuit to adjust the size of the electronic display of the input voltage , and ultimately electronic display brightness control .
3 , a light emitting diode display electronic adaptive luminance control circuit , comprising : a duty cycle preset value input means , a counter and a magnitude comparator , wherein the counter and the duty cycle preset value input means , respectively, the count value and a duty cycle of a preset value comparator compares the input size to control the comparator output value.
4, LED adaptive dimming the brightness of the system hardware design ED and forward proportional to the current flowing through it , you can adjust the size of the forward current to adjust the LED brightness . Now commonly used to adjust the operating current mode pulse width modulation mode or adjust the LED brightness. The former regulation range, good linearity, but large power consumption . So rarely used. Pulse width modulation is a high frequency switching LED, the switching frequency is beyond the scope of people are able to perceive , people do not feel the presence of the strobe . Achieve LED adaptive dimming.

 

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