OLED technology has developed rapidly and has been widely used in small and medium size displays. At the same time， industry is waiting for large-size OLED display for high-end TV. Printed OLED has obvious advantages in the field of flexibility and high PPI， and printed QLED could further strengthen the advantages of printed display technology in color gamut， life time and cost. At present， the key elements such as technology， materials and equipment have gradually matured， and the prelude to the industrialization of printed display in China has opened up. In response to this trend， building China's printed display industry chain， especially the localization of OLED/QLED materials， inks and related equipments， is an important guarantee for the success of China's printed display industry， which requires extensive cooperation among academia， industry and the industry chain.

With reference to the major technological trends of high luminance， wide colour gamut， high contrast and high immersion in new display technologies， the progress of research on visual perception and health were introduced and analyzed in the areas of luminance perception and adjustment， colour performance， high dynamic range optimization and near-eye display， in order to provide a reference for the development of new display technologies.

Based on the Lithium Niobate on insulator （LNOI） platform， an arrayed waveguide grating with a center wavelength of 1 550 nm， 4 channels and a channel spacing of 400 GHz was designed and fabricated， and the edges of the LNOI waveguide was polished. The test results show that the crosstalk between adjacent channels of the arrayed waveguide grating is about -7.5 dB， the channel non-uniformity is less than 0.5 dB， and the center wavelength is 1 551.3 nm， but there is a large insertion loss of about 27.2 dB. The research will play an important role in the development of high-performance LNOI arrayed waveguide grating.

The effects of ion migration， dielectric constant dependence， built-in electric field， trap， thickness and injection barrier on space charge limited current measurement were summarized， and some solutions were briefly introduced， such as using pulsed space charge limited current method for ion migration problem， using different mobility description models for defect problem， etc. This could provide a reference for subsequent scholars to use space charge limited current method to measure perovskite mobility more accurately.

To solve the long lens moving distance and lens defocusing when Laser Chemical Vapor Deposition（LCVD）equipment traces defect points in photomask defect repairing， a kind of ant colony optimization （ACO） algorithm mixed with 2-opt neighborhood search was proposed to optimize the sequence of defect coordinates. The method could effectively reduce the points tracing time and lens defocus rate， compared with the traditional ascending sequence of X or Y axis. To enhance the algorithm processing time in the case of large-scale defects， several acceleration tactics were applied in the ACO algorithm mixed with 2-opt neighborhood search， including nearest neighborhood searching tactic in ACO algorithm， fixed radius searching setting and “don’t look bits tactic” in 2-opt algorithm. The experimental results showed that the improved ACO algorithm mixed with 2-opt neighborhood search could reveal over 92.5% improvement than raw AOI distance， with only 5.72 s time consumption and 0.28% defocus rate. The improved algorithm demonstrates better performance in path optimization quality， optimization time and maintaining lens focusing than basic ACO and basic ACO mixed 2-opt algorithm.

In order to improve the ability of distortion-free reconstruction of the disturbance signal of the Φ-OTDR system， a Φ-OTDR structure was proposed to combine frequency division multiplexing （FDM） and polarization diversity reception （PDR）. It was expected that the use of this fusion technology could effectively achieve simultaneous suppression of interference fading and polarization fading. Through a confirmatory experiment， the average distortion rate of the reconstructed signal of the 10 s data was reduced from 15.55% to 1.10%. Compared with using FDM technology alone to suppress interference fading and using PDR technology alone to suppress polarization fading， it had better fading noise suppression effect， which could provide an effective anti-fading noise method for the engineering promotion of the Φ-OTDR system.

Non-stoichiometric W18O49 nanowires and Ni-doped W18O49 nanowires （Ni-W18O49） were prepared by solvothermal method using WCl6 and NiCl2·6H2O as tungsten and nickel precursor， PVP as surfactant and anhydrous ethanol as solvent. W18O49 and Ni-W18O49 nanowires were sprayed on the transparent conductive substrate of ITO-PET by atomization deposition method to obtain W18O49/ITO-PET and Ni-W18O49/ITO-PET electrochromic thin films. The experimental results indicated that the coloring/bleaching response time of W18O49/ITO-PET electrochromic film decreased from 16.5 s/8.2 s to 10 s/5.8 s by Ni doping. The coloring efficiency of W18O49/ITO-PET electrochromic films increased from 56 cm2·C-1 to 74 cm2·C-1 after Ni doping. Ni-W18O49/ITO-PET electrochromic films has a capacity retention of 70% after 1 500 charging-discharging cycles. Ni doped W18O49 could increase the contents of W5+ and oxygen vacancy， reduce the charge transferring resistance， and improve the electrochromic performance.

Based on the distributed optical fiber measurement method of optical frequency domain reflection （OFDR）， the conversion relationship between the strain measured by optical fiber and the horizontal displacement of soil based on Euler beam theory was proposed， which was verified by indoor experiments. The feasibility of the distributed optical fiber measurement of horizontal displacement and the accuracy of the strain-displacement transformation relationship were verified. The optical fiber measurement method was applied in a foundation pit project. Through the test， the optical fiber measurement method was testified to be able to accurately measure the horizontal displacement of deep soil in the process of excavation.

A design method of refraction⁃reflection hybrid lens was proposed. The lens consisted of five freeform surfaces. The rays with large angles were refracted by two freeform surfaces, and the rays with other angles were reflected to increase the spot size. The energy grid mapping relationship between the light source and the target surface was firstly established, and the freeform surface was constructed based on Snell's law. The simulation results showed that the illuminance distribution of the target plane could meet the design requirements when there was the point light source. However, the uniformity became poor when the extended light source was included. The uniformity was improved by modifying the illuminance distribution of the target surface. The actual test results showed that the uniformity of backlight unit achieved 86.8%, which could meet the design requirements. The designed and optimized refraction⁃reflection hybrid lens could effectively reduce the optical distance and satisfy the requirements for practical application.

Amorphous InGaZnO thin-film transistors （a-IGZO TFTs） passivated by a polyimide （PI） layer has been fabricated. The PI passivation layer has been deposited by the spin-coating method， which could reduce the damage of back surface of a-IGZO channel caused by the passivation layer deposition process and improve the device performance . The PI passivation could effectively block the ambient atmosphere， protecting the TFTs from performance deterioration resulted by H2O and O2 molecule adsorption effects. Moreover， TFTs passivated by PI showed improved stability under negative gate-bias stress （NBS）. The improved stability was inferred to be related to the passivation of traps within the a-IGZO channel by hydrogen which could be diffused into the device from the PI layer during the baking process.

The digital product design platform of liquid crystal display module was established. The construction method of design platform was made clear， and the standardization and universality of product design were improved. The example showed that this design platform construction method could improve the borrowing rate of mature design scheme and data model， shorten the design cycle， improve the reliability of products， and was testified to be feasible and practical， which had certain reference significance for the design and development of liquid crystal display module with different shapes for mass customization.

The opportunities and challenges of developing OLED defect inspection technology and equipment for CELL segment were analyzed， and the OLED detection technologies， testing equipment and the popular equipment manufacturers for CELL segment were listed. Core products and technologies were classified and introduced. From the research point of view， the research contents of CELL segment were also classified and summarized， such as bright spot inspection， dark spot inspection and MURA detection， and the advantages and disadvantages of different methods were analyzed. Finally， the possible trends of CELL segment OLED inspection technology and equipment in the next few years were presented and discussed.