Polymer Network Display Panel for Edge-Lit Luminance Uniformity
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Solution Overview
Problem
Conventional polymer-stabilized liquid crystal displays with edge-lighting type light source modules suffer from poor uniformity in display luminance due to decreased light intensity and quality as the distance between pixels and the light source increases, leading to inadequate light introduction and scattering.
Innovation Solution
A display panel design featuring a liquid crystal layer with pixel electrodes and a polymer network, where the area occupied by the polymer network increases with distance from the light source, and a transparent light absorbing layer to manage light distribution, using photopolymerizable liquid crystal molecules and light absorbing materials like polymethyl methacrylate or polyimide with UV irradiation to control light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an edge-lighting type light source module is used, then the response time is very short (up to about 1ms), but the uniformity of display luminance deteriorates as the distance between pixel and light source increases
Solution Approach 1:
The patent applies local quality by creating a polymer network with spatially varying density - the area occupied by polymer network increases with distance from the light source. This compensates for the distance-related light intensity loss by adjusting the light scattering capability at different locations, thereby improving luminance uniformity while maintaining the fast response characteristics of edge-lighting configuration
2Area of moving object
If the distance between pixel and light source is increased, then the pixel area can be enlarged, but the quantity and quality of light introduced into the pixel region decreases
Solution Approach 1:
By making the polymer network area increase with distance from the light source, the patent compensates for the reduced light quantity and quality at greater distances. This allows larger pixel areas to be accommodated while maintaining adequate light introduction through enhanced light scattering at distant regions
3Illumination intensity
If the area occupied by polymer network is increased to compensate for distance-related light loss, then luminance uniformity improves, but the complexity of manufacturing increases
Solution Approach 1:
The patent implements the varying polymer network area by controlling photopolymerization parameters - specifically by irradiating the liquid crystal layer with UV light in a manner that creates progressive polymerization from the light source outward. This parameter-based control achieves the desired spatial distribution without requiring complex multi-step manufacturing processes
Solution Approach 2:
The polymer network is formed in advance during the manufacturing process through controlled photopolymerization. This preliminary formation of the polymer network with the desired area distribution ensures luminance uniformity is built into the structure before final assembly, simplifying subsequent manufacturing steps
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 emission uniformity by adjusting the effective light emitting area per pixel, improving luminance uniformity and reducing power consumption by compensating for distance-related light intensity losses, while maintaining stability across various light environments.
Implementation Method 1
liquid crystal molecules of the liquid crystal layer in a region corresponding to each of the plurality pixel electrodes are in a polymer network state
Implementation Method 2
liquid crystal molecules are deflected under the influence of the polymer so that their orientations are disordered, thereby scattering out light for displaying
Data Source
AI summary
Embodiments of the present disclosure disclose a display panel, a method of manufacturing the display panel, and a display apparatus. The display panel includes: a first substrate and a second substrate opposite to each other; a liquid crystal layer between the first substrate and the second substrate; and a plurality of pixel electrodes on a side of the first substrate facing towards the liquid crystal layer. Liquid crystal molecules of the liquid crystal layer in a region corresponding to each of the plurality pixel electrodes are in a polymer network state, and the more a distance between the each of the plurality of pixel electrodes and a light source of an edge-lighting type light source module of the display panel is, the more an area occupied by a polymer network in the region corresponding to the each of the plurality of pixel electrodes is.