Display Panel Polarization Layer Heat Blocking
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Solution Overview
Problem
Flat panel display devices face reduced outdoor visibility due to reflected external light and potential defects from conducted heat and chemical permeation through damaged polarizers during manufacturing.
Innovation Solution
A display panel design incorporating a first and second substrate with a touch sensing structure, a touch sensing structure control circuit unit, and a polarization member featuring a circular polarization layer with a slow axis perpendicular to the control circuit unit, along with a linear polarization layer, which blocks reflected light and minimizes heat influence using an index matching member to prevent impurities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer is formed on the display panel to block reflected light, then outdoor visibility is improved, but the polarizer degrades from conducted heat emitting from the control circuit
Solution Approach 1:
A heat blocking layer is introduced as an intermediary component between the control circuit and the polarizer. This layer selectively blocks conducted heat from the control circuit while allowing the polarizer to maintain its light-blocking function for improving outdoor visibility, thus preventing polarizer degradation without sacrificing visibility performance.
Solution Approach 2:
The patent segments the functional layers by placing a dedicated heat blocking layer between the control circuit and the polarizer. This segmentation separates the thermal management function from the optical function, allowing each layer to perform its specific role independently - the control circuit generates heat, the heat blocking layer intercepts it, and the polarizer blocks reflected light.
2Ease of manufacture
If the polarizer is damaged from conducted heat, then chemicals used in manufacturing processes can permeate through the polarizer, but this causes failure of the display panel
Solution Approach 1:
The heat blocking layer is positioned beforehand between the control circuit and the polarizer to prevent heat-induced damage before it occurs. By providing this protective barrier in advance, the polarizer remains intact and chemically resistant throughout the manufacturing process, preventing chemical permeation and subsequent display panel failure.
Solution Approach 2:
The heat blocking layer serves as a protective intermediary that shields the polarizer from both conducted heat and chemical permeation risks. This intermediary layer ensures the polarizer maintains its structural integrity and chemical resistance, preventing manufacturing defects without complicating the manufacturing process.
3Reliability
If the slow axis of the circular polarization layer is perpendicular to the control circuit unit, then heat influence is minimized, but the structure becomes more complex
Solution Approach 1:
The patent optimizes the orientation parameter of the slow axis of the circular polarization layer, setting it perpendicular to the control circuit unit. This parameter change aligns the polarization axis to minimize interaction with heat flow patterns from the control circuit, thereby reducing heat influence on the polarizer while maintaining a manageable structural configuration.
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
Enhances outdoor visibility by blocking reflected light and reduces defects caused by conducted heat and chemical permeation, thereby improving the reliability of the display panel.
Implementation Method 1
a circular polarization layer, wherein a slow axis of the circular polarization layer is substantially perpendicular to a direction in which the polarization member and the touch sensing structure control circuit unit are arranged
Implementation Method 2
an index matching member formed between the polarization member and the third substrate. The index matching member may match indices of the polarization member and the third substrate
Data Source
AI summary
A display device and panel and manufacturing method with improved outdoor visibility and fewer defects caused by heat and chemicals used in manufacturing processes are disclosed. One inventive aspect includes a first substrate having light emitting structures, a second substrate formed on a first substrate, a touch sensing structure formed in a display region of a second substrate, a touch sensing structure control circuit unit and a polarization member. The polarization member is formed on the touch sensing structure and includes a circular polarization layer. The slow axis of the circular polarization layer is substantially perpendicular to a direction in which a polarization member and a touch sensing structure control circuit unit are arranged.