One of the most important specifications in LCD LCDs is brightness. The most important factor in determining brightness is the aperture ratio. What is the aperture ratio? Simply put, it is the ratio of the effective area through which light passes. An LCD monitor is The structure of the past is seen from above or below. When light is emitted through the backlight, not all light can pass through the panel, such as the signal traces for the LCD source driver chip and the gate driver chip, and the TFT itself. There are storage capacitors for storage voltages, etc. In addition to not completely transmitting light, these places are also not able to display the correct gray scale because the light passing through these places is not controlled by the voltage, so the black matrix needs to be used. Masking, so as not to interfere with the correct brightness of other light-transmitting areas. Therefore, the effective light-transmitting area will only remain like the area shown on the right side of Fig. 17. This effective light-transmitting area is proportional to the total area. For the aperture ratio.
When light is emitted from the backlight, it passes through polarizers, glass, liquid crystals, color filters, etc. Suppose the penetration of each part is as follows:
Polarizer: 50% (because it only allows polarized light waves in one direction to pass)
Glass: 95% (Calculates up and down two pieces)
LCD: 95%
Opening ratio: 50% (only half of effective transmission area)
Color filter: 27% (assuming that the material itself has a transmittance of 80%, but because the filter itself is coated with color, it can only allow light waves of that color to pass through. For the three primary colors of RGB, it can only tolerate three of them. One pass. So only one third of the brightness is left. So a total of only 80%*33%=27%.)
