OLED Display Panel Light Filtering for Red Color Cast Compensation
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Solution Overview
Problem
OLED display panels are prone to water and oxygen ingress, leading to changes in light transmission wavelength ranges, causing red light emission and color cast issues, particularly at the panel edges, which affects display quality and stability.
Innovation Solution
A display panel with a light filtering functional layer that includes sensing structures and light-adjusting layers to detect water and oxygen ingress, adjusting the light transmittance of green and blue light-emitting units to compensate for red light emission, using pH-sensitive hydrogels and alkaline metals to control light transmittance based on pH changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encapsulation layer is used to prevent water vapor and oxygen entry, then reliability is improved, but cracks may occur during production causing water and oxygen ingress
Solution Approach 1:
The encapsulation system is divided into multiple independent sealing layers (first sealing layer and second sealing layer) with different material compositions. This segmentation allows each layer to perform specialized functions: the first layer provides primary protection while the second layer compensates for potential cracks in the first layer, thereby maintaining overall reliability without requiring a single overly complex structure.
2Reliability
If edge of OLED display panel is sealed, then reliability is improved, but water and oxygen may still enter at edges causing red light emission
Solution Approach 1:
The patent applies different sealing strategies to different regions of the display panel. The first sealing layer extends across the entire pixel region including edges, while the second sealing layer is positioned specifically at the edges to provide enhanced local protection. This local quality approach ensures that edge areas, which are most vulnerable to water and oxygen ingress, receive specialized attention without over-engineering the entire panel.
Solution Approach 2:
The patent incorporates a compensation mechanism that proactively addresses potential edge sealing failures. By positioning the second sealing layer at the edges and designing it to compensate for cracks or deficiencies in the first sealing layer, the system prepares in advance for potential failures, ensuring continuous protection against water and oxygen ingress at the vulnerable edge regions.
3Illumination intensity
If light transmission wavelength range of insulating layer changes due to water and oxygen entry, then red light emission occurs, but display quality deteriorates
Solution Approach 1:
The patent detects the harmful effect of water and oxygen ingress through sensing structures that monitor changes in the insulating layer's light transmission properties. When red light emission is detected, the system activates compensation mechanisms that adjust the display output to counteract the color cast. This transforms the harmful effect into a detectable signal that triggers corrective action, maintaining display quality despite the presence of water and oxygen.
4Object-affected harmful factors
If sensing structures and light-adjusting layers are added to detect and compensate water and oxygen ingress, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into unified structures. The sensing structures are embedded within the sealing layers themselves rather than being separate components, and the light-adjusting layers are positioned to simultaneously serve as both protective elements and compensation mechanisms. This merging approach reduces the number of discrete components and simplifies the overall device architecture while maintaining the ability to detect and compensate for water and oxygen ingress effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves display quality by balancing red light emission and extending the service life of the panel by increasing the brightness of green and blue pixels to counteract the red light phenomenon, ensuring uniform display and enhanced durability.
Implementation Method 1
each of the light-adjusting layers includes an acidic solution and a pH-sensitive hydrogel, the pH-sensitive hydrogel thereof is in the acidic solution thereof, and when a pH value of the acidic solution thereof increases, a light transmittance of the pH-sensitive hydrogel thereof increases accordingly
Implementation Method 2
when a pH value of the acidic solution thereof increases, a light transmittance of the pH-sensitive hydrogel thereof increases accordingly
Implementation Method 3
the alkaline metal thereof is configured to absorb water and oxygen and then release alkaline anions to enter a corresponding acidic solution through the anion exchange membrane thereof
Implementation Method 4
the anion exchange membrane thereof is configured to isolate the alkaline metal thereof and the corresponding one of the light-adjusting layers, and the alkaline metal thereof is configured to absorb water and oxygen and then release alkaline anions to enter a corresponding acidic solution through the anion exchange membrane thereof
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate, a pixel driving layer, a light-emitting unit layer, and a light filtering functional layer. The pixel driving layer is disposed on the substrate. The light-emitting unit layer is disposed on the pixel driving layer. The light filtering functional layer is disposed on the light-emitting unit layer. The light-emitting unit layer includes red light-emitting units, green light-emitting units, and blue light-emitting units. The light filtering functional layer includes sensing structures and light-adjusting layers. The sensing structures are configured to control a light transmittance of the light-adjusting layers disposed on locations of the green light-emitting units and the blue light-emitting units to increase after sensing water and oxygen, so as to reduce a red-light-displaying phenomenon, thereby improving the quality of the display panel.