Light Transmission Control Layer for Display Reflection Reduction
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Solution Overview
Problem
Conventional display devices face challenges in reducing external light reflection and improving side viewing angles while maintaining high image quality, particularly due to limitations in polarized panels which increase manufacturing costs and are difficult to bend.
Innovation Solution
A display device design incorporating a light transmission control layer with varying transmittance based on electrical signals, positioned above a color filter layer and black matrix, which includes open areas corresponding to pixel electrodes, enhancing light control and reducing reflection without the need for polarized panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarized panel is used to reduce external light reflection and improve side viewing angles, then display performance is improved, but manufacturing cost increases and flexibility decreases
Solution Approach 1:
The patent changes the optical parameters of the display by introducing a light transmission control layer with adjustable transmittance. This layer can dynamically control the amount of light passing through, replacing the need for polarized panels while achieving similar or better display performance with lower manufacturing costs and improved flexibility
Solution Approach 2:
The light transmission control layer acts as an intermediary between the display elements and the external environment. It mediates light transmission to reduce external light reflection and improve side viewing angles without requiring polarized panels, thus solving the technical contradiction
2Reliability
If a polarized panel is used to reduce external light reflection and improve side viewing angles, then display performance is improved, but the panel becomes difficult to bend
Solution Approach 1:
The patent changes the structural parameters by replacing the rigid polarized panel with a flexible light transmission control layer. This layer can be integrated into the flexible display structure, maintaining display performance while enabling bending and flexibility
Solution Approach 2:
The light transmission control layer serves as a flexible intermediary that provides the necessary optical control without the rigidity of polarized panels, thus improving flexibility while maintaining display performance
3Reliability
If the light transmission control layer has a width greater than the black matrix, then light control is improved, but the open area for light emission is reduced
Solution Approach 1:
The patent applies local quality by creating open areas within the light transmission control layer that correspond to the pixel electrodes. These local openings allow light to pass through while the surrounding areas provide light control, thus resolving the contradiction between light control and open area
Solution Approach 2:
The light transmission control layer is designed with a porous or patterned structure containing open areas. This allows the layer to control light transmission in non-open areas while permitting light emission through the open areas, thus maintaining both light control and sufficient open area
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 solution effectively reduces external light reflection, improves side viewing angles, and maintains high image quality by adjusting light transmittance, thereby enhancing user privacy and display performance.
Implementation Method 1
a light transmission control layer located farther from the display element than the color filter layer in a direction perpendicular to an upper surface of the substrate, the light transmission control layer having light transmittance that varies according to an electrical signal
Implementation Method 2
The display element may include an organic light-emitting diode
Data Source
AI summary
A display device including a substrate, a circuit portion including a thin film transistor on the substrate, a display element on the circuit portion, the display element including a pixel electrode electrically connected to the thin film transistor, an encapsulation layer covering the display element, a color filter layer on the encapsulation layer, the color filter layer including a black matrix and a color filter, and a light transmission control layer located farther from the display element than the color filter layer in a direction perpendicular to an upper surface of the substrate, the light transmission control layer having light transmittance that varies according to an electrical signal. The light transmission control layer overlaps the black matrix. A width of the light transmission control layer is greater than a width of the black matrix.