OLED Array Substrate Reflecting Layer for Light Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light emitting diode (OLED) display architectures face issues with aperture ratio, box thickness, high reflectivity, and display color gamut due to the packaging process, leading to problems like light leakage and asymmetry at large viewing angles, which are exacerbated by the black matrix and color filter resistors.
Innovation Solution
An OLED array substrate with a reflecting layer, a photoresist layer comprising overlapping red, green, and blue filter regions, and a pixel electrode layer, where the photoresist layer thickness is less than or equal to 2 microns, and a cover plate assembly with a light barrier, reducing the need for a black matrix and enhancing optical transmittance by increasing the height of pixel definition regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional packaging process with black matrix and color filter resistors is used, then light leakage is reduced, but the aperture ratio is reduced and box thickness increases
Solution Approach 1:
The invention extracts and removes the black matrix layer from the display structure. Instead of using a black matrix on the cover plate to prevent light leakage, the patent uses a reflective layer on the array substrate that actively manages light reflection, thereby eliminating the need for the black matrix and increasing the aperture ratio without compromising light leakage prevention
Solution Approach 2:
The invention introduces a reflective layer as an intermediary between the organic light emitting layer and the substrate. This reflective layer serves as a mediator that reflects light back through the organic light emitting layer, preventing light leakage while maintaining high aperture ratio. The reflective layer replaces the traditional black matrix intermediary that blocked light passively
2Object-affected harmful factors
If the black matrix width is increased to prevent light leakage, then light shielding is improved, but the aperture ratio is reduced
Solution Approach 1:
The invention converts the potentially harmful reflected light into a beneficial effect by using the reflective layer to redirect light back through the organic light emitting layer. Instead of blocking light with a wide black matrix, the reflective layer utilizes reflection to enhance light output, converting what could be stray light into useful display light, thereby preventing light leakage without reducing aperture ratio
Solution Approach 2:
Instead of using an absorbing layer (black matrix) to prevent light leakage, the invention uses a reflective layer that works in the opposite manner - by reflecting light back through the emitting layer. This inverted approach transforms the light management strategy from passive absorption to active reflection, achieving light leakage prevention without sacrificing aperture area
3Area of stationary object
If the black matrix area is reduced to increase aperture ratio, then aperture ratio is improved, but light leakage and reflectivity increase
Solution Approach 1:
The invention extracts the black matrix layer entirely from the display structure and replaces it with a reflective layer system. This removal eliminates the need for large-area black matrices while preventing light leakage through the reflective mechanism, thereby maintaining high aperture ratio without compromising light leakage control
Solution Approach 2:
The reflective layer serves as an intermediary that actively manages light reflection and redirection. Instead of relying on the black matrix intermediary to absorb and block light, the reflective layer intermediary reflects light back through the organic light emitting layer, preventing light leakage while maintaining large aperture areas
4Object-affected harmful factors
If a conventional cover plate structure with black matrix is used, then light leakage is controlled, but viewing angle symmetry deteriorates at large viewing angles
Solution Approach 1:
The invention converts the issue of light leakage into a beneficial effect by using the reflective layer to redirect light back through the organic light emitting layer. This approach maintains viewing angle symmetry because the reflection occurs within the emitting layer itself, ensuring that light is emitted uniformly in all directions, whereas the black matrix approach created asymmetry by blocking light from certain angles
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 minimizes light leakage, maintains high aperture ratio, and reduces reflectivity, thereby improving the display's viewing angle symmetry and color saturation without the need for a black matrix, allowing for a thinner and more efficient OLED display design.
Implementation Method 1
a reflecting layer provided on the substrate
Implementation Method 2
a photoresist layer provided on the reflecting layer, and a pixel electrode layer provided on the photoresist layer
Data Source
AI summary
An embodiment of the present disclosure provides an organic light emitting diode array substrate, an organic light emitting diode display and a method for manufacturing the same. Specifically, the organic light emitting diode array substrate comprises a substrate; a reflecting layer provided on the substrate; a photoresist layer provided on the reflecting layer, and a pixel electrode layer provided on the photoresist layer.