Nowadays, LCD advertising machines are blooming everywhere. Small and medium-sized enterprises are also rushing to get a piece of the pie. The market has higher and higher requirements for LCD display. Next, Rongda Caijing technicians will show you the real image color of LCD advertising machines. Now.
Building advertising machine
With the development of science and technology, the performance of today's semiconductor light-emitting diodes has reached a new level, and its photoelectric conversion efficiency has reached more than 10cd/w. Especially the emergence of blue ultra-bright LED devices makes the spectrum of LED devices cover the range of natural light. .
The visual principle of the full-color LCD advertising machine display is the same as that of a color TV. It realizes the restoration and reproduction of the image color through the different light intensities of the three colors of red, green and blue. The purity of red, green and blue directly affects the visual effect of image color reproduction. However, the three-color ratio of white light is not a simple superposition of three colors.
First, under the premise of ensuring the purity of the optical frequency, the ratio of the intensity of red, green and blue light must be close to 3:6:1;
Second, due to the sensitivity of people's vision to red, the red light source is required to be dispersed in space;
Third, due to the different nonlinear curve responses of people's vision to the light intensities of the three colors of red, green and blue, it is required that white light with different light intensities should be corrected for red, green and blue similar to the gamma correction in TV sets;
Fourth, human vision has limited ability to distinguish chromatic aberration. Therefore, it is necessary to find objective indicators of the authenticity of image color reproduction.
In order to reproduce the real image color, the light distribution of the LCD advertising machine display should meet the following requirements:
① The wavelengths of red, green and blue should be about 660nm, 525nm and 470nm respectively;
② It is better to use 4-tube unit with white light (multi-tube unit is also possible, depending on the light intensity);
③ The gray level of red, green and blue is 256 levels;
④ Non-linear correction for LED pixel tube must be adopted.
The red, green and blue light distribution and nonlinear correction can be realized by the hardware of the display control system or by the software of the playback system.
