Display Panel Light Management Without Polarizing Plate
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Solution Overview
Problem
Display apparatuses face limitations in increasing luminance due to the use of polarizing plates, which reduce light transmittance and efficiency by polarizing both image display and outside light, leading to decreased light efficiency.
Innovation Solution
A display panel design that eliminates the need for a polarizing plate by incorporating a phase adjusting layer, a reflected light absorbing layer, and a reflection adjusting layer to reduce outside light reflection through destructive interference and selective light absorption, while a black matrix layer blocks light emission from pixel boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used to reduce outside light reflection, then outside light reflection is reduced, but light transmittance and light efficiency are decreased
Solution Approach 1:
The invention divides the light management function into separate layers: a first light-blocking layer for blocking outside light, a second light-blocking layer for blocking reflected light, and an emitting layer for light emission. This segmentation allows each layer to perform its specific function without the need for a polarizing plate, thereby preventing light efficiency loss while still reducing outside light reflection.
Solution Approach 2:
The invention extracts and removes the polarizing plate from the display panel structure. By eliminating this component entirely and replacing it with the proposed light-blocking layers, the invention avoids the inherent light efficiency reduction caused by polarizing plates while achieving the same anti-reflection effect.
2Object-affected harmful factors
If a polarizing plate is used to reduce outside light reflection, then outside light reflection is reduced, but luminance is limited
Solution Approach 1:
The invention segments the light control function into distinct layers that can independently operate. The first light-blocking layer handles outside light, the second light-blocking layer handles reflected light, and the emitting layer handles luminance output. This allows full luminance output without the 50% loss inherent in polarizing plate systems.
Solution Approach 2:
By removing the polarizing plate from the system, the invention eliminates the fundamental limitation on luminance that polarizing plates impose. The alternative light-blocking layer structure does not polarize the display light, allowing maximum luminance output while still providing anti-reflection functionality.
3Object-affected harmful factors
If a polarizing plate is used, then outside light reflection is reduced, but light transmittance is decreased
Solution Approach 1:
The invention divides light management into separate functional layers: the first light-blocking layer for outside light, the second light-blocking layer for reflected light, and the emitting layer for display light. This segmentation allows each layer to selectively block only its designated light without affecting the transmittance of display light, unlike polarizing plates that block 50% of all light.
Solution Approach 2:
The invention extracts and removes the polarizing plate that causes light transmittance reduction. The replacement light-blocking layers are designed to block only specific light paths (outside light and reflected light) while maintaining high transmittance for the display light emitted from the emitting layer.
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 design enhances light efficiency and luminance without a polarizing plate, preventing the decrease in light emission efficiency associated with their use, thereby improving display quality.
Implementation Method 1
A phase adjusting layer is disposed on the emitting array. The phase adjusting layer changes a phase of light.
Implementation Method 2
The reflected light and the outside light have opposite phases to each other. The reflected light absorbing layer absorbs at least a portion of the reflected light based on destructive interference between the reflected light and the outside light.
Implementation Method 3
A reflected light absorbing layer is disposed on the phase adjusting layer. The reflected light absorbing layer absorbs at least a portion of light reflected from the emitting array.
Implementation Method 4
A black matrix layer is disposed on a first side of the encapsulation substrate facing the support substrate and corresponds to non-emission areas that are boundaries between the plurality of pixel areas.
Data Source
AI summary
A display panel includes a support substrate including a display area having a plurality of pixel areas and a non-display area disposed around the display area. An encapsulation substrate faces a first side of the support substrate. An emitting array is disposed on the first side of the support substrate. A phase adjusting layer is disposed on the emitting array and changes a phase of light. A reflected light absorbing layer is disposed on the phase adjusting layer and absorbs at least a portion of light reflected from the emitting array. A sealing layer is disposed in the non-display area between the support substrate and the encapsulation substrate. A black matrix layer is disposed on a first side of the encapsulation substrate and corresponds to boundaries between the plurality of pixel areas.