How to Test the Transmittance of LCD with Transmission Meter Linshang?

The higher the transmittance of the LCD screen in the LCD projector, the higher the display brightness of the LCD. There are many factors that affect the transmittance of the LCD screen. How do we test the transmittance of the LCD screen of the projector with transmission meter Linshang?

LCD projectors use the photoelectric effect of liquid crystals, that is, the arrangement of liquid crystal molecules changes under the action of an electric field, affecting the transmittance or reflectivity of the liquid crystal cell, thereby affecting its optical properties and producing images with different gray levels and colors. From the working principle of the LCD, we can know that the brightness of the LCD is related to the transmittance of the LCD screen. In general, the higher the brightness of the LCD screen, the more vivid the displayed color, and the better the actual effect. If the brightness is too low, the displayed color will be darker and it will be very tired after a long time. Nowadays, many LCD manufacturers are trying their best to improve the transmittance of the projector LCD screen to a higher level.

There are many factors that affect the transmittance of a projector's LCD screen. From the structure of the LCD screen, the diffuse reflection of the optical film of the LCD screen, the thickness of the polarizing film, the thickness of the glass, the reflection of the coating layer, the distance of the liquid crystal lattice, etc. All of them can affect the light transmission of the liquid crystal. To improve the transmittance of the LCD screen, we can start from many aspects. For example, the Japanese display company JDI transparent liquid crystal display technology removes the color filter and the polarizing plate which are indispensable for the conventional liquid crystal screen, thereby achieving 80% transmittance.

So how do we test the transmittance of the projector LCD screen? Here we recommend a professional light transmission meter Linshang, it can be used to detect the transmittance of the liquid crystal panel. Light transmittance is a very important optical performance indicator of light-transmitting materials and can reflect the ability of light pass through materials. Transmittance is expressed as a percentage of the ratio of the luminous flux of the light-transmission material to the incident luminous flux.

The transmission meter Linshang is usually composed of a light source, a receiver and a display screen. Below we will demonstrate how to test the transmittance of the projector's LCD screen with LS117 light transmission meter Linshang.
    1. First turn on the instrument, do not put any material, the receiver can read the incident luminous flux and you can see that the transmittance data is 100% when no material is placed.

Test the transmittance of LCD screen with Transmission Meter Linshang

2. Then put the LCD screen of the projector to be tested, as shown in the figure below. After the data is stabilized, we can see that the transmittance of the LCD screen of this projector is 17.818%. The measurement is over and the operation is very simple.

Of course, many customers still have some questions about this instrument. There are so many light transmittance instruments on the market, so why use this one. Above we also learned that there are optically active films in the LCD screen that can diffusely reflect, as well as other translucent components. Light passing through these materials is not a simple regular transmission, but produces diffuse transmission and diffuse transmission. It cannot be received by the common light transmittance meter using the principle of regular transmission.    Therefore, when testing the transmittance of the liquid crystal screen of the projector, LS117 light transmission Linshang with diffuse transmission principle is a better choice.