Reflective Pixel Defining Layer for OLED Light Out-Coupling
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Solution Overview
Problem
Existing OLED display technologies face issues with light leakage and color interference due to the use of transmissive materials in pixel defining layers, which decrease light outgoing efficiency and color purity.
Innovation Solution
A display substrate with a reflective layer in the pixel defining layer that reflects light emitted from the light emitting layer to the outgoing side, preventing interference with adjacent sub-pixels and enhancing light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transmissive materials are used in pixel defining layers, then ease of manufacture is improved, but light outgoing efficiency and color purity deteriorate due to light leakage and color interference
Solution Approach 1:
The patent changes the optical parameter of the pixel defining layer from transmissive to reflective. By using a reflective layer instead of transmissive material, the layer reflects light back through the light emitting layer, preventing light leakage to adjacent sub-pixels while maintaining manufacturing feasibility through standard deposition processes
Solution Approach 2:
The pixel defining layer is constructed as a composite structure including a reflective layer (such as metal or dielectric mirror) combined with insulating materials. This composite approach enables both the reflective function for light control and the insulating function for electrical isolation, resolving the contradiction between manufacturing ease and optical performance
2Ease of manufacture
If transmissive materials are used in pixel defining layers, then ease of manufacture is improved, but color purity deteriorates due to color interference between adjacent sub-pixels
Solution Approach 1:
The patent changes the optical parameter of the pixel defining layer from transmissive to reflective. By using a reflective layer instead of transmissive material, the layer reflects light back through the light emitting layer, preventing light leakage to adjacent sub-pixels while maintaining manufacturing feasibility through standard deposition processes
Solution Approach 2:
The patent converts the potentially harmful lateral light propagation into a beneficial effect by using the reflective layer to redirect light back through the intended sub-pixel. What would have been light leakage causing color interference is now converted into enhanced light output with improved color purity
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
This configuration effectively addresses light leakage and color interference, improving light outgoing efficiency and color purity of OLED displays.
Implementation Method 1
a reflective layer, configured such that light emitted from the light emitting layer to the reflective layer is reflected to a light outgoing side of the display substrate
Data Source
AI summary
Provided are a display substrate and a manufacturing method therefor, and a display device. The display substrate includes: a base substrate, a pixel defining layer (40, 40′) formed on the base substrate, and a light emitting layer located in a sub-pixel region (P) defined by the pixel defining layer (40, 40′), wherein, the pixel defining layer (40, 40′) includes: a reflecting layer (41, 41′), configured such that light emitted from the light emitting layer to the reflective layer (41, 41′) is reflected to a light outgoing side of the display substrate. The display device adopting the display substrate not only can effectively solve the problems of light leakage and light color interference, but also can effectively improve light out-coupling efficiency and color purity.