Aspherical Lens Portion for Jointless Tiled Display Panels
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Solution Overview
Problem
Existing direct-viewing type display devices face issues with image distortion and visible joints when tiling multiple panels, as the refractive properties of curved light-transmitting covers lead to non-uniform pixel pitch and the design optimized for point light sources does not suit surface light sources like liquid crystal displays.
Innovation Solution
A direct-viewing type display device with a light-transmitting cover featuring a lens portion with a non-circular arc curve defined by an aspherical function, refracting light to maintain uniform pixel pitch and incorporating a flat plate portion for central display regions, ensuring the frame region is obscured and joints are not visible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a curved light-transmitting cover with circular arc cross section is used to obscure the frame region, then the frame region is hidden and joints are obscured, but image distortion occurs due to non-uniform pixel pitch
Solution Approach 1:
The patent changes the mathematical parameters defining the lens curve from a simple circular arc to a more complex aspherical function. This parameter change allows precise control over light refraction angles, enabling the lens to redirect light uniformly across different pixel positions while maintaining the frame region obscuration function.
Solution Approach 2:
The patent applies different optical properties to different regions of the lens. The lens portion has a specific aspherical curvature designed to refract light from peripheral pixels at different angles than central pixels. This local variation in optical quality ensures that all pixels contribute uniformly to the displayed image while the frame region remains obscured.
2Ease of manufacture
If a lens portion is added to the light-transmitting cover to redirect light, then frame region is obscured, but device complexity increases
Solution Approach 1:
The patent merges the frame region obscuration function and the light redirection function into a single integrated light-transmitting cover. The lens portion is formed as part of the cover itself rather than as a separate component, simplifying the overall device structure while achieving both objectives simultaneously.
Solution Approach 2:
The light-transmitting cover serves multiple functions: it protects the display panel, transmits light from the display region, obscures the frame region, and redirects light to eliminate joints. This multi-functionality reduces the need for additional components and simplifies the device architecture.
3Area of stationary object
If multiple display panels are arrayed to create a large screen, then screen size is increased, but visible joints appear between panels
Solution Approach 1:
The lens portion acts as an intermediary element between adjacent display panels. It redirects light from the peripheral regions of each panel to fill in the frame regions, effectively mediating the transition between panels and creating a continuous, jointless image across the entire large screen assembly.
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 provides an undistorted and jointless image across the entire screen by uniformly refracting light from the display regions, effectively hiding the frame regions and preventing visual recognition of joints during panel tiling.
Implementation Method 1
Light which goes out from pixels which are arrayed in the peripheral display region is refracted by the lens portion toward the frame region
Data Source
AI summary
A direct-viewing type display device includes: a display panel having a display region and a frame region provided outside the display region, with a boundary extending along a first direction between the display region and the frame region, the display region having a plurality of pixels arrayed therein; and a light-transmitting cover disposed on the viewer's side. The light-transmitting cover includes a lens portion disposed astride the boundary for refracting a portion of light going out from the display region toward the frame region. The lens portion refracts the light so that light emitted from the plurality of pixels in the display region has a substantially equal pitch on a plane which is perpendicular to the first direction. A line of intersection between the plane which is perpendicular to the first direction and a viewer-side surface of the lens portion is a curve which is not a circular arc.