In recent years, the harm of blue light to human eyes has gradually been recognized and concerned by people. Blue light hazard exists not only in illumination sources, but also in display products. Reducing the blue light content is a direct way to reduce the hazard of blue light. However, blue light is an indispensable component band in the spectrum of display products. It is a necessary color to meet the needs of color temperature and gamut of display products, as well as to display the real color of the world. Therefore, the anti-blue light hazard technology of display products without lowering the normal display standard has been an important research direction in the display field. At present, many researchers at home and abroad have conducted many research on blue light hazard and anti-blue light display technology. In this paper, the mechanism, classification and evaluation methods and standards of blue light hazard were explained. And then the influencing factors of blue light hazard in the display products were analyzed. Moreover, the new progress of anti-blue light display technology was introduced and summarized.

An LCoS (Liquid Crystal on Silicon) using dielectric protrusions to eliminate fringe field effect is proposed. The dielectric protrusion structure is designed between the pixel electrodes to block the crosstalk electric field between the adjacent pixel electrodes. The liquid crystal molecular director distribution and fringe field crosstalk of the LCoS are simulated, the mechanism of fringe field effect and its influencing factors are analyzed, and the corresponding reflectivity and phase are calculated and compared. The LCoS with dielectric protrusions has a significant effect on eliminating the edge reflectance and phase interference of adjacent pixels compared to the traditional LCoS. The reflectance is always maintained at 96%, the phase difference remains unchanged, areas with contrast greater than 35∶1 are over to 60° and the overall viewing angle is largely unaffected. The proposed dielectric protrusion can eliminate the influence of the transverse electric field on the orientation of liquid crystal molecules in adjacent pixels, which improves the contrast of LCoS and greatly improves the display effect.

In order to improve color gamut of the LCD, a filter based on TiO2-Ag-TiO2-Ag-glass structure is added in the backlight unit to optimize the backlight spectra. The proposed filter can only transmit the red, green and blue light in visible light range, while reflecting other color light. The effect of a filter on the color gamut of LCD is simulated by TechWiz 1D software. When the proposed filter integrated with pc-WLED, KSF-LCD and QD backlight, the color gamut of LCD can be improved from 72% to 102.6% NTSC, from 92.3% to 113.8% NTSC, and from 104.3% to 1199% NTSC, respectively. When the incident angle of light increases from 0° to 40°, the color gamut with three backlight changes a little. The simulation results show that the filter based on MDM structure has a smaller angle dependence, so it is a very effective method to realize wide color gamut LCDs. However, the light utilization rate is very low, and the light efficiency of the three backlights is 265%, 35.4%, and 40.7%, respectively.

The pigments have advantages on thermal stability, light resistance and chemical resistance, so they are wildly applied to manufacturing color filters. However, the color filters manufactured with pigments have introduced spectral drawbacks such as decreased transmittance of light and decreased contrast ratio (CR) both caused by organic nano-pigments. Among the three primary colors, green one has the highest brightness and the greatest effect on CR. In this study, our focus is on a green color filter with wide color gamut, which mainly contains three pigments, such as pigment green 58 (G58), pigment yellow 138 (Y138), and pigment yellow 185 (Y185). The Y185 with high tinctorial strength has been introduced to effectively reduce the color filter thickness, but the CR is decreased. In this paper, the effect of scattering and fluorescence on CR of Y138 and Y185 are analyzed. The size, n (refractive index), crystal structure, morphology and fluorescence properties of these two kinds of pigments have been compared. The results show that the aggregation of Y185 organic nano-pigments in CF manufacturing process is the main reason, which leads to the lowered CR. By systematically investigating the effects of the organic nano-pigments on CR, this paper provides a theoretical basis and guidance for realizing the CFs with high CRs by designing organic nano-pigments.

As for advanced super dimension switch (ADS) LCD, using finger to slide the surface of LCD lighting on L255 image, the luminance of sliding areas on LCD reduces owing to the liquid crystal molecules deformation and electrical field. Usually, the liquid crystal of sliding area recovers due to electrical field, and also the luminance of those sliding area recovers. While the dark area can not recover in 5 s, trace Mura occurs. In this paper, by validating the recovery time after finger sliding 5 kinds of panels with different slit end design and slit space values, the impact of pixel design on trace Mura is investigated. Comparing with simulated LC twist angle, a method for evaluating trace Mura of panel is found. The results are as flow: Firstly, for slit end design, panel with arc angle is the best for trace Mura prevention, and panel with open tilt is the worst, of course, panel with tangent tilt design appears middle risk for trace Mura. Simultaneously, narrower slit space design also appears faster recovery time and also is beneficial to trace Mura prevention. Secondly, reducing gray level of panel by setting a lower driving voltage is beneficial to trace Mura and also a good method for erasing trace Mura. Finally, the results of recovery time after sliding and simulated LC twist variations at slit end show that panel with larger than －15° LC twist variation has higher risk for trace Mura, which could be a method for evaluating trace Mura risk of ADS LCD.

Aiming at the LCDs’ abnormal display under electromagnetic interference, a comprehensive method is proposed to improve LCDs electromagnetic immunity and display under complex electromagnetic environment based on the signal transmission integrity theory. Firstly, the abnormal display mechanism under electromagnetic interference is analyzed based on signal integrity. Secondly, the scheme of improving LCDs electromagnetic immunity performance is summarized based on the three aspects of adaptive signal quality enhancement model, signal transmission path optimization and LCDs composite absorbing material. Finally, electromagnetic simulation and product testing results demonstrate that the above proposed scheme can effectively improve LCDs anti-electromagnetic interference and electromagnetic compatibility performance.

Electrostatic discharge(ESD) is a common defect in TFT-LCD rubbing process, For example, the ratio of ESD is 20% at 317.5 mm(12.5 in) product, it is a great influence on the yield of products. The causes of ESD in rubbing process is studied with the theoretical analysis and experiment. Experiments show that the main reason for ESD is that there are large floating metal on the TFT substrate. In rubbing process, the charge is easy to accumulate on the TFT substrate and burning down the electric circuit, so the panel is abnormal. ESD can be reduced through controlling rubbing process and optimizing design. In process, increasing humidity and coating electrostatic prevention and controlling the life time of rubbing cloth can improve ESD. In design, by changing the large floating metal into small floating metal, ESD can be improved. By optimizing the process and design, the ESD ratio is reduced from 20% to 0%, which greatly improves the panel quality and reduced the product cost.

On account of its thinner display module and accurate local dimming ability, the Mini-LED technology has become a popular research direction in display field. Aiming at the lighting-off phenomenon through the light board aging process, the reason and mechanism of the lighting-off phenomenon is explored beginning with the manufacture process of the LED board. Based on the FEM simulation method, combined with the manufacture process and the structure of the Mini-LED light board, the simulation model is established reasonably, and the temperature simulation results showed the error of the model is within 5% compared with the measured results. In order to get the thermal stress field of the light board under extreme situation, the simulation result of the light board temperature field under high temperature operation is imported into the mechanics simulation. Compared with the measured results, the simulation result of the maximum chip thrust is between the upper quartile and the lower quartile, and is bigger than the average value of the measured results, which show the simulation is accord with the actual situation. The solder paste is developed based on the simulation, and the result shows that the probability of the light-off phenomenon is reduced to under 1×10-5 from 113×10-4 when the maximum chip thrust is increased by 15%, which shows the improvement effect is obvious.

In the fiber laser communication system, in order to overcome the influence of quasi-error, random angular jitter error and atmospheric turbulence aberration on SMF( single-mode fiber) coupling efficiency, a single mode fiber optic nutation tracking coupling system is designed. Based on the principle of mode field matching, the influence of radial deviation and spot size on coupling efficiency is analyzed. Secondly, based on the theoretical analysis, the laser nutation tracking system is designed, including laser, collimating mirror, fast mirror, coupling lens and photodetector, and the laser nutrient is completed by the energy feedback of the photodetector. Tracking algorithm is designed. Finally, an experimental platform is built and the system is tested experimentally. Through experimental tests, the coupling efficiency of single mode fiber is 53.5% in laser nutation tracking, the influence of radial deviation and spot size on coupling efficiency is tested, and the corresponding curve is obtained. The coupling efficiency satisfies the system requirements, and the experimental test curve is basically consistent with the theoretical analysis.

Image denoising aims to reduce or eliminate the effects of noise on images. This process often has the loss of high frequency information. In order to protect the edge information and texture details of the image while removing image noise, a convolution neural network which can connect image local path information is proposed. After training, the network can directly denoise the noisy image without preprocessing the image. The neural network proposed in this paper consists of three parts, feature extraction layer, information connection blocks and information reconstruction layer. The information connection blocks are key part of the network, and the mixed feature information of the local long path and the local short path is extracted through residual learning. The experimental results show that the image processed by this algorithm has a significant improvement on the reference image quality evaluation index PSNR and SSIM, the maximum PSNR can reach 34.87 dB, SSIM can reach more than 0.87, and the image quality evaluation index BRISQUE and NIQE without reference have a significant decline. The algorithm in this paper has a relatively good effect on different levels and different kinds of algorithms, and its performance is better than the general algorithm. It has a certain practical value in denoising work.

Real-time analysis of vehicle motion state has important practical application value in automatic driving and assistant driving of vehicles. In order to realize the judgment of vehicle behavior, a vehicle behavior recognition algorithm based on lane information fusion is proposed. Firstly, a model based on improved Robinson and LSD is proposed. The improved Robinson operator is used to obtain the optimal gradient amplitude to realize the edge extraction of the lane, and then the lane detection is realized by LSD algorithm. Then, a cubic spline interpolation method based on sliding window is used to fit the lane. Finally, the motion state of the vehicle is analyzed according to the lane parameter information, and the deviation information of the vehicle is obtained combining with the center position of the vehicle. In the test of BDD100K dataset, the accuracy of lane detection in the algorithm is 9561%, the accuracy of vehicle behavior recognition is 93.04%, and the number of transmission frames per second reaches 42.37. The experimental results show that the proposed algorithm can effectively distinguish the motion state of the vehicle and give the vehicle deviation information in different scenarios, which has higher accuracy and robustness.

With the rapid development of diversified media and digital information network, the digital image encryption technology is widely used in the fields of secure preservation, communication, copyright protection and secret communication of graphic images. In view of the shortcomings of the existing image encryption algorithm based on hyperchaos, an improved algorithm is proposed, which optimizes the configuration of pixel scrambling, and further confuses the correlation effect between the plaintext image and the encrypted text image through pixel replacement and encrypted text diffusion process, thereby shortening the iteration time of the superchaotic system. The results show that the distribution of pixel values in the histogram after encryption is very uniform; the NPCR value and UACI value between ciphertexts are 99.652 1% and 33.432 1%, respectively, indicating that the algorithm is extremely sensitive to small changes in encryption keys. The introduction of this method in the new hyperchaotic sequence quantization mode can effectively improve the operation efficiency, and the algorithm has good performance in both security and effective application, and can be widely used in image security communication and other fields.