Display Device Peep-Proof Grating and Optical Modulation
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Solution Overview
Problem
Existing display technologies lack a peep-proof mechanism to prevent unauthorized viewing of information on display screens, compromising user privacy, especially in portable devices.
Innovation Solution
A display device incorporating a light emitting panel with an optical modulation unit and a grating layer that collimates and directs light exit at a preset angle, combined with a liquid crystal display panel to control light direction and prevent unauthorized viewing, using a wire grid polarizer to enhance light extraction efficiency and reduce device thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peep-proof mechanism is added to prevent unauthorized viewing, then user privacy is protected, but device structure becomes more complex
Solution Approach 1:
The patent combines the peep-proof function with the existing display structure by integrating the grating layer and optical modulation unit directly into the display device architecture. The grating layer is positioned between the light emitting panel and the optical modulation unit, merging multiple functions (light emission, optical modulation, and peep-proof protection) into a single integrated structure rather than adding separate components.
Solution Approach 2:
The optical modulation unit serves multiple purposes: it modulates incident light to exit at preset angles for peep-proof functionality, controls light direction for viewing angle management, and works with the grating layer to parallelize exit directions. This multi-functional design achieves privacy protection without requiring dedicated separate components for each function.
2Reliability
If light is directed at preset angles to prevent peeping, then privacy is improved, but light extraction efficiency may be reduced
Solution Approach 1:
The patent uses the grating layer to change the directional parameters of emitted light, parallelizing exit directions and directing light at preset angles. By modifying the optical parameters (direction and angle) through the grating structure, the system achieves peep-proof functionality while the optical modulation unit compensates to maintain adequate light extraction efficiency through voltage-controlled liquid crystal orientation.
Solution Approach 2:
The grating layer acts as an intermediary between the light emitting panel and the optical modulation unit, parallelizing the exit directions of incident light before it reaches the optical modulation unit. This intermediary structure helps manage light direction efficiently, reducing energy loss by organizing light paths in a controlled manner before further modulation.
3Reliability
If multiple layers (grating layer, optical modulation unit) are added, then peep-proof function is achieved, but device thickness increases
Solution Approach 1:
The patent implements a nested structure where the grating layer is positioned within or between the light emitting panel and the optical modulation unit. The optical modulation unit itself contains multiple components (first substrate, second substrate, liquid crystal layer, electrode structures) nested within each other. This nesting approach minimizes overall thickness by sharing spaces and interfaces between components rather than stacking them as separate external additions.
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 prevents unauthorized viewing by collimating and directing light exit, improving light extraction efficiency and extending the service life of the display device while maintaining user privacy.
Implementation Method 1
the grating layer is configured to parallelize exit directions of incident light
Implementation Method 2
the optical modulation unit is configured to modulate incident light to exit at a certain preset angle
Implementation Method 3
respective groups of the electrode structures being configured to control liquid crystal molecules of corresponding regions in the liquid crystal layer to deflect to form a microprism structure
Implementation Method 4
using a wire grid polarizer to enhance light extraction efficiency
Data Source
AI summary
Provided in the embodiments of the present disclosure are a display device and a display terminal. The display device includes a light emitting panel and at least one optical modulation unit provided on a light exit side of the light emitting panel, a grating layer being provided in the light emitting panel, or between the light emitting panel and the optical modulation unit, wherein the optical modulation unit is configured to modulate incident light to exit at a certain preset angle, and the grating layer is configured to parallelize exit directions of incident light.