Analysis of relationship between picture quality and power consumption of liquid crystal display
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Central issue:
Illuminance sensing component characteristics
Illumination sensing element function
Development trend of illuminance sensing components
solution:
Detecting the amount of light in the surrounding environment and automatically adjusting the lighting condition of the backlight mode
Direct connection to LSI, short start-up time and easy operation
With the rapid increase in the number of mobile phones and LCD TVs, how to reduce the power consumption of LCD monitors and improve the image quality, especially when the screen is too bright at night, the eyes are prone to fatigue, and the dark interior screen appears dark, which has become a must for the relevant industry. The problem to overcome. Fortunately, in recent years (Fig. 1), the technical improvement of the illuminance sensing element (photosensordevice), which utilizes the illuminance sensing element whose spectral characteristic is close to the human visual sensibility, can effectively solve the above problem.
According to statistics from foreign industry, the potential market for global illumination sensing components exceeds 1 billion. Among them, the annual market demand of 600 million mobile phones is currently the main market. In addition, the shipment forecast for 2008 will exceed 30 million units. LCD TVs, as well as automotive instrumentation, displays, and lighting fixtures are suitable targets. In view of this, this article will delve into the application and development of illumination sensing components.
Illuminance sensing component characteristics
As shown in Fig. 2, the illuminance sensing element has the characteristic of sensing only the nighttime outdoor (Lux; illuminance unit), and even the sunny outdoor brightness is exceeded. In other words, if the above characteristics can be fully applied and precision control is performed, the theory can be thoroughly Solve problems such as poor image quality caused by light sources in various electronic devices. For example, the illuminance sensing component can detect the amount of light in the surrounding environment at any time, automatically adjust the lighting condition of the backlight mode resistance, thereby effectively reducing the battery consumption power (power consumption) of the portable electronic product, and prolonging the call and standby time and the battery. Service life (Fig. 3(a)).
Regarding the application of LCD TVs, the longer the lighting time of LCD monitors, the greater the power consumption. The relative heat dissipation and the noise of the cooling fan become very difficult problems, especially when the brightness of large LCD TVs is mostly exceeded. In the bright indoors, the picture is very bright, but there is ripple in the dark room, and the picture is too bright to cause eye fatigue. The black floating phenomenon of the dark color image is very obvious, and the image contrast is greatly reduced. Since the liquid crystal television is based on the liquid crystal transmittance of each pixel, the light of the Backlight Module is adjusted to achieve gray scale display. However, the amount of light of the excessive backlight module is leaky, and if the illumination sensor is used to detect the liquid crystal. The brightness of the TV viewing environment adjusts the brightness of the backlight module accordingly. In addition to the black floating of the image, the dynamic range of the brightness can be reduced under the same gray level, thereby improving the performance of the black image (Fig. 3). (b)), and reduce the maximum brightness to remove the image too bright, which means that when watching LCD TV, consumers will not be affected by the audio-visual environment, and you can get fine images at any time.
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