Transparent Display Black Matrix Light Leakage
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Solution Overview
Problem
Current transparent display devices suffer from light leakage in dark states, reducing contrast ratios due to small light exit sizes and the use of polarizers, which limits ambient light transmittance and display performance.
Innovation Solution
A transparent display device design featuring a light guide plate with rectangular light exits and a liquid crystal unit, including a black matrix with overlapping strip-shaped light-shielding layers and an electrode layer with non-parallel strip electrodes, which blocks diffracted light in dark states while allowing light emission in bright states, enhancing contrast ratio and ambient light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer is used in the transparent display device, then the display performance is improved, but the ambient light transmittance is reduced
Solution Approach 1:
The patent removes the polarizer from the transparent display device structure. Instead of using a polarizer to control light transmission, the invention uses a liquid crystal layer that can be controlled to either transmit or block light, thereby eliminating the component that was reducing ambient light transmittance while maintaining display functionality.
Solution Approach 2:
The patent divides the light control function into separate components: a liquid crystal layer for light modulation and a light-shielding layer for blocking light in specific regions. This segmentation allows the device to achieve display performance without requiring a polarizer, thus maintaining high ambient light transmittance.
2Measurement precision
If the light exit size is reduced, then the display resolution is improved, but light leakage in dark states increases
Solution Approach 1:
The patent introduces a light-shielding layer as an intermediary component between the light exit and the liquid crystal layer. This light-shielding layer effectively blocks light leakage in dark states, allowing the use of small light exits for high resolution without suffering from light leakage problems.
Solution Approach 2:
The patent applies light-shielding properties locally at the light exit regions using the light-shielding layer. This localized approach blocks light leakage only where needed (at the light exits) while maintaining transparency in the display areas, thus resolving the contradiction between small light exit size and light leakage control.
3Reliability
If a sealed liquid crystal box is used, then the liquid crystal molecules are protected, but the device complexity increases
Solution Approach 1:
The patent merges the liquid crystal layer with the light-shielding layer and electrode structure into an integrated configuration. The liquid crystal layer is positioned between the light-shielding layer and the electrode, eliminating the need for a separate sealed box while still protecting the liquid crystal molecules through the layered structure.
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 light leakage in dark states, improving the contrast ratio and maintaining high ambient light transmittance, thereby enhancing the display performance of transparent display devices.
Implementation Method 1
the light extraction grating is configured to extract light in the light guide plate
Implementation Method 2
an electrode layer for controlling liquid crystal molecules in a liquid crystal layer to form a liquid crystal grating
Data Source
AI summary
Transparent display device, manufacturing method and controlling method thereof are provided. The transparent display device includes a light guide plate with a rectangular light exit, and a liquid crystal unit including multiple strip electrodes arranged in parallel and a black matrix; the black matrix includes a first and second strip-shaped light-shielding layers; an arrangement direction of the multiple strip electrodes is not parallel to any edge of the light exit; an orthographic projection of the first strip-shaped light-shielding layer on the light guide plate covers at least a center of the light exit and an extension direction of which is parallel to a first edge of the light exit, and an orthographic projection of the second strip-shaped light-shielding layer on the light guide plate covers at least the center of the light exit and an extension direction of which is parallel to another edge perpendicular to the first edge.