Display Panel Polarization Stack for Light Utilization
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Solution Overview
Problem
Current reflective display apparatuses have low light utilization rates, poor light transmittance, complex manufacturing processes, long development cycles, and performance instability in mass production, limiting their application to small-sized display products.
Innovation Solution
A display panel design incorporating a liquid crystal cell, an optical layer, and polarization structures that transmit and reflect light based on polarization axes, enhancing light utilization and contrast ratio while simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a reflective display apparatus uses ambient light without a backlight module, then energy consumption is reduced and service life is extended, but light utilization rate is low and light transmittance is poor
Solution Approach 1:
The optical stack is segmented into distinct functional layers: first polarization structure, optical layer, liquid crystal cell, and second polarization structure. Each layer performs a specific function in light manipulation, allowing optimized light control through coordinated action of separated components rather than a monolithic structure.
Solution Approach 2:
The patent utilizes changes in polarization parameters of light as it passes through different layers. The first polarization structure polarizes incident light, the liquid crystal cell modulates polarization state based on applied voltage, and the second polarization structure converts polarization changes into intensity variations, thereby improving light utilization efficiency.
2Illumination intensity
If the optical layer transmits and reflects light based on polarization direction, then light reflectivity in bright state is improved, but light leakage in dark state increases
Solution Approach 1:
The liquid crystal cell acts as an intermediary between the first and second polarization structures. By controlling the liquid crystal orientation through applied voltage, it mediates the polarization state of light passing through the system, enabling precise control over light transmission and reflection while minimizing unwanted light leakage.
Solution Approach 2:
The patent employs a composite optical structure combining multiple functional materials: polarizing films, birefringent optical layers, and liquid crystal materials with specific optical properties. This composite approach enables simultaneous achievement of high reflectivity in bright state and low leakage in dark state through complementary material characteristics.
3Reliability
If a complex optical structure is used to improve light control, then display performance is enhanced, but manufacturing complexity increases and production stability decreases
Solution Approach 1:
Each optical layer serves multiple functions: the optical layer not only controls light reflection but also compensates for viewing angle dependence and maintains color accuracy. The polarization structures simultaneously polarize light and block unwanted polarization states. This multi-functionality reduces the need for additional separate components, simplifying manufacturing while maintaining performance.
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 improves light reflectivity in bright states and reduces light leakage in dark states, enhancing the contrast ratio and stability of the display panel, making it suitable for larger and more diverse display applications.
Implementation Method 1
The optical layer is configured to transmit part of light incident onto the optical layer whose polarization direction is parallel to a transmission axis of the optical layer, and reflect a remaining part of the light incident onto the optical layer
Implementation Method 2
The first polarization structure is configured to transmit part of light incident onto the first polarization structure whose polarization direction is parallel to a transmission axis of the first polarization structure, and absorb a remaining part of the light incident onto the first polarization structure
Implementation Method 3
The second polarization structure is configured to transmit part of light incident onto the second polarization structure whose polarization direction is parallel to a transmission axis of the second polarization structure, and absorb a remaining part of the light incident onto the second polarization structure
Implementation Method 4
The plurality of first optical films are birefringent
Data Source
AI summary
A display panel includes: a liquid crystal cell; an optical layer configured to transmit part of light incident onto the optical layer whose polarization direction is parallel to a transmission axis of the optical layer, and reflect a remaining part of the light incident onto the optical layer; a first polarization structure configured to transmit part of light incident onto the first polarization structure whose polarization direction is parallel to a transmission axis of the first polarization structure, and absorb a remaining part of the light incident onto the first polarization structure; and a second polarization structure configured to transmit part of light incident onto the second polarization structure whose polarization direction is parallel to a transmission axis of the second polarization structure, and absorb a remaining part of the light incident onto the second polarization structure.