Display Substrate With Arc-Shaped Openings for Color Purity
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Solution Overview
Problem
OLED display substrates using COE technology suffer from low light extraction rates due to the use of polarizers, leading to higher power consumption, and exhibit color separation phenomena due to diffraction at sub-pixel light-exiting openings, especially in arrangements with different color sub-pixels.
Innovation Solution
The display substrate design includes arc-shaped first light-transmitting openings in the black matrix layer, with corresponding sub-pixel openings, to reduce or eliminate diffraction and enhance light extraction, utilizing a 2T1C pixel driving circuit and a color film layer to improve light purity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If polarizers are used in OLED display substrates, then display quality is improved, but light extraction rate decreases and power consumption increases
Solution Approach 1:
The patent removes the polarizer layer from the display substrate structure, extracting the harmful element that caused both display quality issues and energy loss. By eliminating the polarizer entirely and using the black matrix layer with arc-shaped openings as the primary light control mechanism, the system achieves both high display quality and high light extraction efficiency without the energy-wasting polarizer component.
Solution Approach 2:
The black matrix layer is given multiple functions: it serves as both the structural support layer and the light control element. The arc-shaped openings in the black matrix layer simultaneously define sub-pixel boundaries, control light extraction, and eliminate the need for separate polarizer and color filter layers, achieving multi-functionality that resolves the contradiction between display quality and energy efficiency.
2Ease of manufacture
If conventional rectangular openings are used, then manufacturing is simplified, but color separation phenomena occur due to diffraction
Solution Approach 1:
The patent replaces conventional rectangular openings with arc-shaped (curved) openings in the black matrix layer. This curvature design reduces diffraction effects at the edges of the openings, thereby eliminating color separation phenomena. The arc-shaped geometry maintains manufacturing feasibility while significantly improving optical performance by reducing edge diffraction.
3Loss of energy
If arc-shaped openings are used in black matrix layer, then diffraction is reduced and light extraction is enhanced, but device complexity increases
Solution Approach 1:
The patent merges the functions of the black matrix layer, color filter layer, and light extraction structure into a single integrated layer. The arc-shaped openings in the black matrix layer simultaneously perform light extraction, color definition, and diffraction reduction, eliminating the need for separate functional layers and thereby reducing overall device complexity despite the curved geometry.
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
The design enhances light extraction rates and reduces power consumption while minimizing color separation, improving display performance and efficiency.
Implementation Method 1
exhibit color separation phenomena due to diffraction at sub-pixel light-exiting openings
Implementation Method 2
a light-emitting device in the light-emitting device layer... the pixel driving circuit is configured to drive the light-emitting device
Data Source
AI summary
A display substrate and a display device are provided, the display substrate has a plurality of sub-pixels arranged in an array, and includes a base substrate, a driving circuit layer, a pixel definition layer, a light-emitting device layer, and a black matrix layer, each of the plurality of sub-pixels includes a pixel driving circuit in the driving circuit layer and a light-emitting device in the light-emitting device layer, the pixel definition layer includes a plurality of sub-pixel openings, the light-emitting device includes a first electrode layer, a light-emitting material layer, and a second electrode layer, the plurality of sub-pixel openings respectively expose first electrode layers of light-emitting devices of the plurality of sub-pixels; the black matrix layer includes a plurality of first light-transmitting openings respectively exposing the light-emitting devices of the plurality of sub-pixels, and at least one of the plurality of first light-transmitting openings has an arc-shaped edge.