3D Liquid Crystal Display Panel Eye Box Expansion
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Solution Overview
Problem
Naked-eye 3D displays face issues such as crosstalk, moiré, and dead zones due to a small eye box, limiting the range of human eye movement, and existing eye tracking technologies have slow response times, making it difficult to effectively switch views.
Innovation Solution
A 3D liquid crystal display panel with a first grating layer, electrode layers, and a color filter layer, where the electrode layers apply voltages to form a liquid crystal grating, allowing collimated light to change direction and pass through light transmitting regions at different angles, expanding the eye box without reducing display luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a small eye box is used in naked-eye 3D display, then the display structure is simpler, but the range of human eye movement is limited
Solution Approach 1:
The display panel is divided into multiple sub-pixels (red, green, blue) arranged in specific patterns, with each sub-pixel having dedicated light shielding strips and light transmitting regions. This segmentation allows different angular ranges to be assigned to different sub-pixels, expanding the overall eye box while maintaining manageable structural complexity through modular design
Solution Approach 2:
The patent introduces a new dimension of control by implementing light shielding strips and light transmitting regions within the plane of the color filter layer, rather than simply adjusting the size of the eye box in three-dimensional space. This planar dimensionality change enables expansion of the eye box area without proportionally increasing the overall device volume or structural complexity
2Speed
If eye tracking technology is used to switch views, then view switching can be achieved, but the response time is slow
Solution Approach 1:
The display panel pre-configures multiple light transmitting regions and angular ranges before viewing begins. When the viewer's eye position changes, the system can immediately activate the appropriate pre-configured regions without waiting for tracking processing, thereby achieving fast view switching while maintaining the ability to track eye position for optimization
Solution Approach 2:
The patent implements dynamic control of liquid crystal gratings that can rapidly change their optical properties in response to applied voltages. This dynamic response allows the display to adapt to eye movement in real-time with fast response times, overcoming the limitation of slow eye tracking systems by making the display itself adaptive rather than relying solely on tracking speed
3Area of moving object
If light shielding strips are added to divide filter units, then the eye box can be expanded, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the width, spacing, and positioning parameters of light shielding strips and light transmitting regions to achieve acceptable manufacturing tolerances. By carefully selecting parameters such as the width of light shielding strips and the spacing between sub-pixels, the design achieves expanded eye box area while keeping manufacturing precision requirements within practical limits
Solution Approach 2:
Different regions of the display panel have different light shielding strip configurations tailored to their specific functions. For example, certain areas may have wider light shielding strips for better angular separation, while other areas have narrower strips to maximize light transmission. This local optimization allows the system to achieve high eye box area with moderate overall manufacturing precision requirements
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 enables a larger eye box range for naked-eye 3D displays, maintaining high luminance and allowing longer response times for visual tracking, effectively addressing the limitations of existing naked-eye 3D display technologies.
Implementation Method 1
applying voltages to the first electrode layer and the second electrode layer, respectively, to form a liquid crystal grating in the liquid crystal layer
Implementation Method 2
a collimated light incident to the liquid crystal layer passes through the liquid crystal grating and changes the direction to pass through the plurality of light transmitting regions in the filter unit at different angles
Data Source
AI summary
A 3D liquid crystal display panel includes: a first substrate, a second substrate, and a first grating layer including grating openings arranged in an array for realizing 3D display; and a CF layer including a plurality of filter units arranged in an array, a black matrix disposed between adjacent filter units, and at least one light shielding strip disposed inside each of the filter units and dividing each of the filter units into a plurality of light transmitting regions. The 3D liquid crystal display panel is configured to apply voltages to the electrode layer to form a liquid crystal grating in the liquid crystal layer, and a collimated light incident to the liquid crystal layer passes through the liquid crystal grating and pass through the filter unit to form a monochromatic light, and then, is emitted out from the grating openings.