Based on green optical device ITO/HAT-CN/TAPC/CBP∶Ir(ppy)3/TmPyPB/Liq/Al, the influence of doping ratio of different concentrations of Yb on device performance is studied by doping different concentrations of Yb in Liq as modified electrode of electron injection layer. The research shows that the doping of Yb in Liq can effectively improve the photoelectric performance of the device. When the doping ratio of Yb is 1.85%, the device performance is the best. Under the condition of 0.25 mA/cm2, the starting voltage is 3.65 V, the maximum brightness is 26 720 cd/m2, the maximum current efficiency is 87.07 cd/A, the maximum power efficiency is 74.89 lm/W, and the maximum external quantum efficiency is 24.07%. Compared with the reference device, the maximum brightness increases by 2 181 cd/m2, the maximum current efficiency increases by 18.42 cd/A, the maximum power efficiency increases by 10.6 lm/W, and the maximum external quantum efficiency increases by 5.27%.

In order to improve the success rate of repairing AMOLED’s bright pixel defect and optimize the performance of the device, an AMOLED bright pixel defect repairing method is investigated to achieve the sub-pixel cathode isolation. Firstly, a pulsed laser beam with fixed shape and frequency is constructed by a laser repairing device with the laser shaping mechanism (Slit). Then, the laser beam passes through the AMOLED panel encapsulation layer to illuminate the cathode film layer above the target sub-pixel, so that the target sub-pixel luminescent layer is separated from the cathode of the panel. The cathode electrons cannot migrate to the target sub-pixel luminescent layer and the target sub-pixel changes from bright to dark. In this paper, the rectangular repair method and the line repair method are proposed and compared. The results show that the success rate of the rectangular repair method is 33.5%; the success rate of the line repair method is 100%. Compared with the rectangular repair method, the line repair method has a lower reliability risk. Therefore, the line repair method is better. In our study, the repair success rate increases from 96.9% to 100% when the line repair method is introduced into mass production.

To improve the production capacity, the PI (polyimide) film coating method of High Advanced Dimension Switch (HADS) products is changed from APR transfer printing ( Roller Coater) to inkjet printing(Inkjet Printer). The change of coating method causes the accumulation of polyimide (PI) solution near the Vcom via hole and Vcom line which exists in the peripheral zone, which causes a failure named “peripheral black line”. Firstly, we can solve the diffusion problem of PI solution by changing PVX (passivation SiNx) mask, that is, to reduce the influence of via hole by changing the cycle, size and distance between via hole and active area. we reduce the cycle of Vcom via hole near gate pad (GP) area by a factor of eight, the occupied area of Vcom via hole decreases by 98% than before. In the meanwhile, we reduce the cycle of Vcom via hole near date pad (DP) area by a factor of nine, the occupied area of Vcom via hole decreases by 99%, the distance between via hole of GP area and AA area increases by 60% than before. The changing of PVX mask greatly improves the diffusion of PI solution, eventually, the failure rate of black line reduces from 100% to 6.6%. Secondly, we develop an edge compensation function of inkjet printer to reduce the accumulation of PI solution in peripheral area, that is, the PI thickness of peripheral area is half the active area, the reduction of PI solution in the EM area reduces the possibility of accumulation in the area, and then the failure rate of black line reduces from 6.6% to 0.5%. Thirdly, we change the coating mode from pattern coating to strip-type coating, that is, the GP area is filled with PI solution in all area, which reduces the failure rate from 0.5% to 0.05%. By changing the PVX mask design and process parameters of Inkjet printer, the incidence of peripheral black line defects are reduced from 100% to 0.05%, meeting the mass production needs.

MoOxthin film is considered to be an ideal choice in border-less TFT LCD for its low reflectivity. In this work, MoOx thin films are deposited at room temperature by utilizing magnetron sputtering on glass substrate. The properties of MoOx films, composite films of MoOx and different metal films are studied by different methods. The results show that MoOx film can be deposited on glass substrates without undercoating because of the good adhesion between them. The adhesion of MoOx to Al and Cu is better than that of Mo and Mo alloys, such as MTD. The square resistance of MoOx thin film is large and can be neglected when it is composed with metal layers. The thickness of MoOx has a great influence on the reflectivity of composite films of MoOxand metal film. Different MoOx thicknesses show different colors when it is composed with metal layers while the thickness of metal layer has little effect on color. In the production of border-less TFT LCD, metal layer can be choose according to the properties of MoOx to match with and the color of products can be adjusted by changing the thickness of MoOx layers to meet the color preferences of the customers on the basis of meeting the requirements of reflectivity.

HADS products typically use organic film materials to reduce parasitic capacitance for high PPI display. In this paper, the process optimization of the common electrode ITO and the data line short-circuit defect of the organic film product designed by the top ITO for the pixel electrode (Pixel Top) is improved. Firstly, the mechanism of DCS failure of HADS organic film products is analyzed by microscope and Focused Ion beam. A ‘one-step etch’ process variation improvement scheme which skips the PVX1 etch step and retains PVX1 until PVX2 etch is proposed. Aiming at the problem of PVX1 layer undercut of TFT gate via hole in the new process verification experiment, the PVX1 film quality is improved by adjusting the PECVD film formation parameters. The optimum film formation condition is selected to further adjust the dry etch process, and an excellent slope angle is obtained. On the TFT substrate which uses the optimized one-step etching process, the PVX1 slope angle of gate via hole is less than 40° and there is no significant step between the PVX1 and the GI layer, and there is no obvious step between the PVX1 and the GI layer. The mass production rate of the DCS caused by the absence of the organic film is reduced to zero. By optimizing the process, the product defect rate is reduced while the process steps are reduced and the production capacity is increased.

In order to realize the lightness of the LCD(liquid crystal display)and further reduce the thinness and the cost of backlight module, composite optical films have become the focus of research and development of most optical films manufacturers. In this paper, the structure of the backlight module and the optical performance of the optical film for liquid crystal display are described and optical efficiency of optical films for LCD are described. The pivotal factors in the process of optical films recombination are studied by using light tools software. The influenced mechanism of prism angle, prism pitch and prism peak penetration depth (D) are evaluated. Two types of composite optical films structure are separately discussed and simulated, one is two-in-one structure; another one is three-in-one structure include. Through using the light tools simulation, the optical effects are evaluated and analyzed from the point of view of center brightness, uniformity and visual angle. Via the phenomenon of stimulating, the improvement characteristics of optical composite structure with two different combination structures for display picture are obtained. Through simulation and experiment, it is found that when the top angle of prism is 90°, the pitch of prism is from 24 μm to 54 μm, and the penetration depth (D) is 1～3 μm, the brightness uniformity of composite optical diaphragm can reach more than 81%. This research has certain guiding significance for practical application and development about composite optical films, which will help to speed up the development progress of backlight module and reduce the thickness and cost of backlight module.

In order to reasonably reduce the backlight power consumption of the liquid crystal display, suppress the clipping noise caused by pixel compensation and reduce the color and brightness distortion of the display image, the dynamic dimming algorithm of the liquid crystal display based on image features is studied. Firstly, according to the characteristics of liquid crystal display, the process of regional dimming algorithm is introduced, and the cause of clipping noise is analyzed. Then, the dynamic dimming algorithm of liquid crystal display based on local brightness of image is proposed to obtain the initial backlight value based on the maximum value method. The initial backlight value is corrected according to the similarity between the brightness of the local area of the image and the brightness of the corresponding area of the initial backlight distribution image. Through the Blur Mask Approach, the mixed light diffusion process of the backlight is simulated, and combining pixel compensation, a dimming image is obtained. The experimental results show that the backlight power consumption is reduced by about 31.54% on average, the truncation noise is as low as 1.17% of the total pixel, and the L*a*b color space peak signal-to-noise ratio(LabPSNR) is 37.11 dB on average. The application of the algorithm can reasonably reduce the backlight power consumption of the display, so that the truncation noise of the image is significantly suppressed, the color and brightness distortion are obviously improved, and the applicability is good for various images.

The voltage-driven electrowetting prisms often need to be connected to a larger additional power supply device for manual adjustment, which is not conducive to the integration of the electronic control system and the prism device. Meanwhile, it fails to meet the requirement of the small size and portability of the electrowetting liquid prism device in the practical applications requirements. Aimed at the problems above, an electric control system based on STM32 single-chip microcomputer is designed. The low voltage of the DC power supply output is boosted to the required voltage by the boost chopper circuit, and the four output voltages are adjusted according to the demand. The two-liquid prism is driven to the two-dimensional liquid surface deflection, which makes the unit device convenient and quick to use, and easy to control. The model is simulated and analyzed by COMSOL software to verify the correctness.

Edge detection is the main basis for separating the target object and background of the image. The edges of the image are determined by detecting a set of pixel points whose gray level changes significantly on the image. At present, most of the methods of edge detection apply two algorithms to improve the quality of edge detection. In this paper, GAUSS-filter, SOBEL, NMS and OTSU algorithms are adopted and implemented on the FPGA to perform image edge detection. The original collected color image is converted into a grayscale image, and the image is firstly smoothed by GAUSS-filter to eliminate interfering noise. The SOBEL operator is used to calculate the image gradient value, then the NMS algorithm is applied to process the grayscale, and pick out a set of the grayscale pixels with the largest gradient value of the contour edge. Finally, the OTSU algorithm is used to adaptively determine the image threshold for edge detection. This method can not only describe the edge of the image, but also refine the edge. The experimental results show that the image has a good detection effect on different images. The method proposed in this paper that has been implemented on FPGA of the image edge detection has the characteristics of accurate, real-time, high-speed, embedded, etc., and can be applied to many fields.

The significance of wide color gamut image technology and the concepts of the visible color gamut, the conventional color gamut and the target color gamut of the mainstream wide color gamut video standards are scketched out. In view of the shortcomings of the RGB three-primary-color matching theory, the multi-primary-color wide color gamut technology is introduced. Then, the development of wide color gamut image technology is expounded, the existing extended color gamut technologies are classified, the current mainstream three-primary-color, multi-primary-color wide color gamut technology and their corresponding imaging and display devices are described. Finally, the difficulties and future trends of wide color gamut technology are discussed, which provide reference for relevant researchers to understand the wide color gamut video image technology.

Aiming at the problem that the traditional color transfer algorithm has color mis-transmission and unnaturalness as processing images, an image color transfer method based on dense connection generative adversarial network is proposed. During the training process, the training generation network generates the color transfer image. The coding layer in the generated network promotes the reuse of color features and speeds up the convergence rate of the network by using the cross-layer connection of the dense connection network. The conversion layer uses a three-layer residual module instead of the original two-layer residual module to combine different features of the image. The discriminating network is trained to distinguish the difference between the original image and the generated transfer image. The -log function is used to calculate the model loss in the network and speed up the initial update of the training. The experimental results show that the result image of this method retains more details compared with the similar model, can suppress some noise and the whole image is closer to the natural image.

In order to improve the efficiency of image retrieval, an adaptive texture image retrieval algorithm based on transform domain is proposed. The algorithm uses two-dimensional discrete wavelet transform to reduce the size of the test image and the trained image, and further applies the LL component of the 2-level decomposition image in the gray level co-occurrence matrix to train and test to extract the texture features of the image, and finally combine shape features and color features retrieve similar images by fusing different distance classifiers. In order to improve the adaptive ability of the algorithm, an interactive genetic algorithm is introduced to dynamically adjust the parameters. The experimental results show that the accuracy of the proposed algorithm is above 67% when the number of training iterations is 30, 60, and 100. The algorithm has high application value in the field of image retrieval, and has the advantages of stable and reliable performance and high precision.

With the continuous development of communication technology and large data, many internet applications such as the large-scale network games, network payment and financial anti-counterfeiting are threatened and risked by security. In order to encrypt data in the transmission process and prevent malicious tampering, the concealment of the mainstream watermarking algorithm is studied and analysed. On the basis of robustness and robustness, a watermarking scheme of discrete wavelet transform based on pseudo-random algorithm is proposed. The algorithm embeds binary pseudo-random number into HL and LH domains of discrete wavelet transform (DWT), and uses pseudo-random number to enhance the concealment and robustness of digital watermarking. The simulation results show that the algorithm has high security and robustness, and can effectively resist various attack algorithms such as SPIHT compression, Gauss filtering, salt and pepper noise. Its peak signal-to-noise ratio (PSNR) and normalized correlation (NC) values are more than 10% higher than the traditional watermarking algorithm. The algorithm in this paper can meet the requirements of stability, reliability, strong anti-interference and high concealment of digital watermarking on the whole.