Is the dimming method of LCD screen related to eye protection? Let's discuss it together!
Monitors are electronic output devices that are often used in daily office life. There is a reference point for consumers to purchase: whether it is an eye-protecting monitor. To a certain extent, the dimming method of the monitor has a certain relationship with whether the eye protection is maintained.
Let's briefly talk about the dimming mode of the monitor. Interested friends are welcome to discuss.
1. What is screen dimming
Screen dimming refers to controlling the brightness of the screen display by adjusting the brightness level of the display. The purpose of dimming is to adapt to the lighting conditions and user needs in different environments to provide a more comfortable and appropriate display effect.
Visible dimming purpose:
Improve visual comfort: In darker environments, excessive screen brightness may cause discomfort to the eyes. Lowering the brightness can reduce the fatigue of the eyes and improve visual comfort.
Protecting vision: Long-term exposure to excessively bright screens will cause harm to vision. Adjusting the brightness appropriately can help protect vision.
2. DC dimming
DC dimming, the full English name is Direct Current (DC dimming).
1. The following is the working principle of DC dimming:
DC power supply: In DC dimming systems, lamps are usually powered by DC power supplies, which can be batteries, adapters, or other DC power supplies.
Voltage regulation: Controls the brightness of the light by adjusting the output voltage of the DC power supply. When the voltage is increased, the light becomes brighter; when the voltage is reduced, the light becomes darker.
Dimming controller: A special dimming controller is usually used to adjust the output voltage of the DC power supply. The dimming controller can be a knob, button, remote control or intelligent dimming system, etc., which is used to change the output voltage to control the brightness of the light.
Lamp adaptability: It is necessary to ensure that the lamp itself is suitable for receiving dimming signals and make corresponding brightness adjustments. Some LED lamps and bulbs have good dimming performance and can work stably at different brightnesses.
DC dimming is simply understood as giving a light bulb a high voltage and a low voltage will become darker.
2. Advantages of DC dimming
High Energy Efficiency: DC dimming systems are generally more energy efficient than traditional AC dimming because they can directly control the brightness of LED lamps without the need for additional energy loss components.
Strong flexibility: DC dimming system can provide a wider range of brightness control, from full turn-off to maximum brightness, and users can make fine adjustments according to their needs.
Dimming Stable: DC dimming can provide more stable light brightness, avoiding possible flicker or strobe phenomena in AC dimming, which is conducive to protecting vision and improving comfort.
Fast response: DC dimming systems are usually faster to respond, allowing instant brightness adjustment, meeting the needs of modern people for lighting comfort and flexibility.
Wide applicability: DC dimming system is suitable for various types of lamps, including LED lamps, fluorescent lamps, etc., and can be flexibly applied in different environments and occasions.
To sum up, DC dimming system has many advantages such as high energy efficiency, strong flexibility, good stability and wide applicability, making it a highly favored technical solution in modern lighting control systems.
3. PWM dimming
Another dimming method: PWM dimming solves the problem of DC dimming at low brightness on OLED screens.
PWM dimming, the full English name is Pulse Width Modulation (Chinese: Pulse Width Modulation). It works by changing the alternating frequency of the screen light and turn off to adjust the screen brightness.
How PWM dimming works:
Pulse signal generation: First, a fixed frequency pulse signal is generated by a dimming controller or dimming circuit. The frequency of this pulse signal is usually very high, generally in the range of tens of kHz to hundreds of kHz.
Duty Cycle Adjustment: The duty cycle of the pulse signal (i.e. the ratio of high-level time to the total period time) determines the magnitude of the output power. When the duty is relatively large, the light brightness is higher; conversely, when the duty is relatively small, the light brightness is lower.
Transfer to Lamp: The dimming controller transmits the adjusted PWM signal to the Lamp or light source driver. The lamp controls the brightness of the light according to the received PWM signal, that is, it emits light within the high level time during the pulse period and does not emit light within the low level time.
Human Eye Perception: Because the human eye is less sensitive to light changes, even if the light dims in a very short period of time, the human eye will not feel it. Therefore, by changing the duty cycle of the PWM signal, a smooth dimming effect perceived by the human eye can be achieved.
By continuously adjusting the duty cycle of the PWM signal, stepless dimming of the light can be achieved, providing a more refined and smoother brightness adjustment effect. PWM dimming technology is widely used, such as LED lighting, motor control and other fields.
Whether it is LCD and OLED screens, DC and PWM dimming, they are all considerations for consumers to purchase products. From the initial pursuit of performance to the pursuit of texture, I finally found that choosing a display screen that does not hurt your eyes is the most important thing. Therefore, it becomes particularly important for terminal manufacturers to choose LCD LCD display modules with DC dimming.
