Display Device Grating Period Gradient Brightness Uniformity
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Solution Overview
Problem
Display devices suffer from poor brightness uniformity due to a fixed field-of-view concentration area and non-field-of-view concentration area, resulting in uneven light distribution and a poor viewing experience for the viewer.
Innovation Solution
A display device with a grating layer arranged inside or outside the display panel, where the grating period decreases gradually from the center of the sight concentration area to the non-sight concentration area, causing the diffraction angle of non-zero-order diffraction to increase, allowing diffracted light to deflect towards the viewer and improve light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixed field-of-view concentration area is used in the display device, then the light emergent direction is uniform across different areas, but the brightness uniformity deteriorates because light rays from the non-field-of-view area do not fall into the viewer's sight
Solution Approach 1:
The patent applies local quality by varying the grating period in different regions of the display device. Specifically, the grating period in the non-field-of-view concentration area is designed to be different from that in the field-of-view concentration area, enabling different light diffraction characteristics in different regions. This allows light from the non-field-of-view area to be redirected into the viewer's sight, improving brightness uniformity while maintaining overall directional consistency.
2Ease of manufacture
If the grating period is kept constant across the display panel, then the manufacturing process is simplified, but the diffraction angle remains fixed and cannot redirect light from non-field-of-view areas to the viewer's sight
Solution Approach 1:
The patent implements dynamics by transitioning from a static, uniform grating period to a dynamic, spatially varying grating period. The grating period is designed to change continuously or in steps across different regions of the display panel, particularly in the non-field-of-view concentration area. This enables the diffraction angle to adapt to different viewing positions and redirect light effectively, while the manufacturing process remains feasible through standard photolithography techniques with spatially varying patterns.
3Device complexity
If light rays from the non-field-of-view concentration area are not redirected, then the optical path remains simple, but the light amount and intensity falling into the viewer's sight are insufficient, causing poor brightness uniformity
Solution Approach 1:
The patent introduces the grating layer as an intermediary element between the display panel and the viewer's eye. This grating layer acts as a mediator that redirects light rays from the non-field-of-view concentration area into the viewer's sight without requiring complex optical paths. The grating structure provides a straightforward yet effective mechanism for light redirection, maintaining optical simplicity while significantly improving light intensity distribution and brightness uniformity.
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
This solution enhances brightness uniformity by increasing the light intensity in non-field-of-view areas, matching the light amount and intensity with the field-of-view areas, thereby improving the viewing experience by reducing brightness differences across the image.
Implementation Method 1
when incident light incident on the grating layer is diffracted in an area of the grating layer corresponding to the non-sight concentration area of the display device, the obtained light of non-zero-order diffraction falls into sight of a viewer
Data Source
AI summary
A display device is disclosed. The display device includes a display panel, and a grating layer arranged inside or outside of the display panel. Along a direction pointing from a center of a sight concentration area of the display device to a non-sight concentration area of the display device, a grating period of the grating layer decreases gradually. When incident light incident on the grating layer is diffracted at an area of the grating layer corresponding to the non-sight concentration area of the display device, the obtained light of non-zero order diffraction falls into a sight of a viewer.