Display Substrate Layout to Reduce Rainbow Color Shift
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Solution Overview
Problem
Display devices are prone to reduced lifespan and decreased luminous efficiency due to the ingress of impurities like moisture and oxygen, which can cause interference and color shifts when viewed from side angles, leading to a rainbow-colored effect.
Innovation Solution
A display device design featuring a light blocking pattern between the substrates to absorb incident and reflected light, along with a spacer to maintain a controlled space, which reduces coherence and minimizes the rainbow-colored color shift phenomenon by optimizing the distance and width of the light blocking pattern and spacer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light blocking pattern is added to block incident and reflected light, then the rainbow-colored color shift is reduced, but the device complexity increases
Solution Approach 1:
The light blocking pattern is segmented into multiple discrete elements positioned at specific locations between the substrates. Rather than a continuous blocking layer, the pattern uses separate light-blocking segments that are strategically placed to intercept reflected light paths, reducing the rainbow effect while minimizing overall structural complexity
Solution Approach 2:
The light blocking pattern acts as an intermediary element introduced between the pixel defining layer and the second substrate. This intermediate structure mediates the interaction between incident light and the display layers by absorbing or blocking reflected light before it exits the display, thereby reducing color shift without requiring fundamental changes to the core display structure
2Ease of manufacture
If the space between substrates is increased to reduce coherence, then the rainbow-colored effect is improved, but the device volume increases
Solution Approach 1:
Rather than uniformly increasing the space between substrates across the entire display area, the invention applies the light blocking pattern only in specific local regions where reflected light paths intersect. This localized approach reduces coherence and rainbow effects at critical viewing angles without unnecessarily increasing the overall display device volume
Solution Approach 2:
The light blocking pattern employs asymmetric positioning and varying dimensions of blocking elements at different locations. The pattern is not uniformly distributed but rather asymmetrically arranged to target specific reflected light paths that cause rainbow effects, allowing effective interference reduction with minimal space occupation
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
Effectively reduces the rainbow-colored color shift at side viewing angles, improving display quality by blocking external light and maintaining a stable internal environment within the display device.
Implementation Method 1
a light blocking pattern disposed on a surface of the second substrate facing the first substrate and overlapping the pixel defining layer in a plan view... The light blocking pattern may block incident light incident from outside and reflection light in which the incident light is reflected by the pixel defining layer
Implementation Method 2
a spacer disposed between the pixel defining layer and the light blocking pattern... a distance between an edge of a surface of the pixel defining layer facing the second substrate and an edge of a surface of the light blocking pattern facing the second substrate
Data Source
AI summary
A display device includes: a first substrate, a pixel electrode disposed on the first substrate, a pixel defining layer disposed on the first substrate and covering at least a portion of the pixel electrode, a second substrate disposed on the pixel defining layer and spaced apart from the first substrate and the pixel defining layer to define a space between the second substrate and the pixel defining layer, and a light blocking pattern disposed on a surface of the second substrate facing the first substrate and overlapping the pixel defining layer in a plan view.