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Calculation of liquid crystal display aperture ratio

In Electronic Infomation Category: C | on April 20,2011

Liquid crystal display, there is a very important specification is the brightness, and RX-8025SA datasheet and determines the brightness of the most important factor is the aperture ratio. The opening rate is what is it? Simply means that the light through the effective area ratio. The figure on the left is a LCD display directly above or from below the view of the same structure.

When the light emitted by the backlight, not all of the light will pass through panels, such as a LCD source driver and RX-8025SA price and gate driver IC chip with the signal traces, and RX-8025SA suppliers and the TFT itself, but also save the storage used for voltages capacitor and so on. In addition to these places are not fully transparent, but also as a result of these places are not subject to voltage control of light, and can not display the correct gray scale, so are required to be covered by black matrix, to avoid interference to other regions of the correct light intensity . Therefore, the effective light transmission area, as shown on the left shows the right side of the area only. This is an effective light transmission area, with the proportion of the total area is called the aperture ratio.

When the light emitted from the backlight will order through the polarizer, glass, crystal, color filter and so on. Assuming all parts of the transmission as shown below: polarizer 50% (because it only permitted in one direction by the polarization of light), the glass 95% (need to calculate the upper and lower two), LCD 95%, 50% open rate (the effective area is only half the light), color filter 27% (assuming that the material itself wear penetration rate of 80%, but the filter itself is coated with a color, it can only by the color of the light. to RGB primary colors, it can only allow one through three, so only the remaining one-third brightness.

So only by a total of 80% * 33% = 27%. ) To calculate the transmittance of the above, the light from the backlight off only the remaining 6%, it is pitiful. This is why the design of TFT LCD, to try to improve the aperture ratio of the reason. As long as the increased aperture ratio, it can increase the brightness, backlight brightness while also not so high, you can save power and * fee.

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