OLED Panel Low Gray Color Shift Adjustment Layer
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Solution Overview
Problem
OLED display panels suffer from low gray-scale color shift and brightness issues due to off-state leakage current and varying cut-in voltages of sub-pixels, leading to color cast and reduced accuracy in color emission.
Innovation Solution
Incorporating a low gray color shift adjustment layer between the anode and OLED device layer, and/or between the OLED device layer and cathode, with adjustable thickness and doping concentration, to reduce leakage current and current density, thereby improving color accuracy and brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a TFT structure is used to control output current for displaying different brightness, then the OLED can achieve variable brightness levels, but off-state leakage current causes the OLED to lighten in black pictures and color cast occurs at low gray-scales
Solution Approach 1:
An intermediary layer is introduced between the anode and the OLED device layer to mediate the electrical characteristics. This intermediary layer acts as a buffer that modifies the current distribution and reduces leakage effects, thereby improving color accuracy at low gray-scales while preserving brightness control functionality.
Solution Approach 2:
The electrical parameters of the device are modified by introducing the intermediary layer, which changes the current-voltage characteristics and reduces off-state leakage. This parameter change approach allows the system to maintain brightness control while eliminating color cast issues at low gray-scales.
2Use of energy by moving object
If the OLED uses very thin organic material coating to achieve lightweight and power saving, then the device becomes thinner and more energy efficient, but the low gray-scale color shift and brightness issues become more pronounced
Solution Approach 1:
The intermediary layer serves as a mediating structure that compensates for the thin organic material coating's insufficient current control. By positioning this layer between the electrode and the thin OLED layer, it provides additional electrical regulation that reduces leakage current effects, thereby improving color accuracy without increasing power consumption or thickness.
3Productivity
If the cut-in voltage of sub-pixels is not uniform, then the pixel with lowest cut-in voltage is easiest to be lightened, but this causes color cast in low gray-scale display
Solution Approach 1:
The intermediary layer provides localized electrical regulation at the pixel level, where it directly addresses the varying cut-in voltage characteristics of different sub-pixels. By positioning the layer between the anode and OLED device layer, it creates local electrical conditions that equalize current distribution across pixels with different cut-in voltages, eliminating color cast while maintaining fast display response.
Data Source
AI summary
The disclosure relates to the field of OLED display technology, more particularly, to an OLED display panel and a manufacturing method thereof, during the manufacturing process of the OLED display panel, by forming a low gray color shift adjustment layer between the anode and the OLED device layer, and/or between the OLED device layer and the cathode, so as to solve the color shift problem under low gray-scale by adjusting thickness or doping concentration of the low gray color shift adjustment layer, and improve the accuracy of emitting color of the OLED panel.