OLED Display Substrate Recess Layout for Thin Top Emission Panels
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Solution Overview
Problem
Top emission OLED display devices face challenges in maximizing light utilization efficiency and minimizing device thickness due to structural limitations, particularly in integrating thin film transistors and circuits, which affect the aperture ratio and light emission efficiency.
Innovation Solution
A display substrate with recesses on one side, accommodating spacers from a color filter substrate, is designed to reduce thickness, improve light emission efficiency, and prolong the life of light-emitting elements by allowing for a shorter light-emitting path, featuring a pixel defining layer, light-emitting layer, and cathode stacked in grooves within the insulating layer, and an anode connected to a thin film transistor through a via hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a top emission display device is assembled with a display substrate and color filter substrate, then light emission efficiency is improved and aperture ratio can reach 100%, but device thickness increases due to the need to accommodate spacers and circuit structures
Solution Approach 1:
The recesses in the display substrate accommodate the spacers from the color filter substrate, creating a nested structure where the spacer protrusions fit into the substrate recesses. This nesting arrangement reduces the overall device thickness while maintaining the top emission structure that enables 100% aperture ratio and high light emission efficiency.
Solution Approach 2:
The invention introduces recesses in the thickness dimension of the display substrate to accommodate spacers, transforming a planar assembly into a three-dimensional nested structure. This dimensional change allows the device to maintain thin profile while accommodating all necessary components for top emission operation.
2Adaptability or versatility
If thin film transistors and circuits are integrated in the display substrate, then device functionality is improved, but the aperture ratio and light utilization efficiency are reduced due to structural limitations
Solution Approach 1:
The display substrate is segmented into different functional regions: areas with thin film transistors and circuits for device functionality, and areas with recesses for accommodating spacers. The pixel defining layer is also segmented into sub-pixel openings for light emission and other regions for circuit integration. This segmentation allows simultaneous optimization of functionality and aperture ratio.
Solution Approach 2:
Different regions of the display substrate have different local qualities: some areas contain thin film transistors and circuits with higher structural complexity, while other areas have recesses optimized for spacer accommodation and light emission. The pixel defining layer has different properties in sub-pixel openings versus circuit regions, enabling local optimization of both functionality and light utilization.
3Use of energy by moving object
If the light-emitting path is shortened to improve light emission efficiency, then light utilization is improved, but the structural complexity increases due to the need for recesses and stacked layers
Solution Approach 1:
The pixel defining layer, light-emitting layer, and cathode are merged and stacked within the recesses of the display substrate. This combining of multiple functional layers into a compact stacked arrangement within the recesses shortens the light-emitting path and improves light utilization efficiency while managing structural complexity through integrated design.
Solution Approach 2:
The recesses are formed in the display substrate before assembling the color filter substrate and its spacers. This preliminary preparation of the substrate structure with pre-formed recesses simplifies the subsequent assembly process and reduces the overall structural complexity compared to forming recesses after assembly.
Data Source
AI summary
The present disclosure provides a display substrate, a display device and a manufacturing method thereof. The display substrate includes a first substrate, a pixel defining layer on the first substrate and including a plurality of sub-pixel openings, and at least one recess on a side of the display substrate away from the first substrate. An orthographic projection of the at least one recess on the first substrate and orthographic projections of the plurality of sub-pixel openings on the first substrate do not overlap.