It is necessary to use thin film encapsulation for protecting the organic emitting device of the flexible display from the oxygen and moisture permeation. The optical properties of the OLED device protected by thin film encapsulation have been investigated. It was found that the chroma of the emitting light of the OLED device was changed by the thin film encapsulation. The thin film encapsulation influenced the emission spectrum of the OLED device. The optical length of the micro-cavity of the emitting device was adjusted to compensate the variation of the chroma.
Low temperature poly silicon technology with a temperature of 400℃ was developed and discussed for the application of flexible liquid crystal display (LCD). By optimizing the doping and activation processes, the TFT device with a mobility of 80 cm2/V•s was fabricated successfully. Also we studied the mechanism of doping and activation at 400℃, and found out that the upper limit of implanted dosage and electrical activation rate were 2 × 1014 ions/cm2 and 20%, respectively.
We present in this work a calibration method for under-display optical fingerprint sensor. Sources of nonuniformity in captured raw images are analyzed, which are attributed to Moiré fringe and rear leakage of pixel luminance. An algorithm is proposed to filter the fingerprint image based on two pre-stored frames measured with standard reflecting surfaces. As a result, clear fingerprint images are obtained from an under-OLED optical sensor.
The microwave phase modulation of liquid crystal depends on the rotation angle of liquid crystal molecules under the external electric field, and the alignment layer on the surface of liquid crystal drive electrode important influence on it. In this paper, the microwave phase modulation characteristics of non-chiral doped nematic liquid crystal under different materials with polar alignment layer and different rubbing alignment conditions are studied. The variation of different frictional strengths and microwave phase-shifts magnitude with the driving voltage of liquid crystal was tested through the test method. It provides a basis for the design of a liquid crystal microwave modulator and the selection of liquid crystal alignment materials.
We propose a new pixel design which has one slit electrode for 806 ppi resolution. The pixel design facilitates a reduction of disclination area in the pixel and enhancement of aperture opening ratio. We also propose a new photo spacer design which has smaller shading area for VR. This design improves the problem of dark spots caused by the fixed shading area. As a result, we have demonstrated a high transmittance, good image quality without dark spots and high product yield on 2.8 inch 806 ppi panel.
The liquid crystal phase shifter integrates the technologies of the liquid crystal display and radar antenna. It belongs to a brand-new interdisciplinary research field. The traditional leakage rate test method of electronic components is not suitable for the liquid crystal phase shifter. The liquid crystal phase shifter and liquid crystal display have similar structures and they are sealed by sealant, so, this article adopts the saturated vapor experiment and liquid crystal display material physical properties test method to make a theoretical research and experimental verification for the leak rate of the liquid crystal phase shifter. In this paper, we set up a kind of theoretical model for the liquid crystal phase shifter leak rate test and realize the actual measurement for the theoretical model. The test results comply with expected judgment, which shows that the theoretical model works, and the test results have actual guiding significance for the material and technological selection for producing liquid crystal phase shifters.