Near-Eye Display Pixel Shift Layout for Wide-Angle Color Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing near-eye display systems suffer from a color cast at large viewing angles due to microcavity effects and four-corner light crosstalk in OLED displays, affecting virtual reality and augmented reality products.
Innovation Solution
The display apparatus employs a design where pixel units at the center and edge of the display region have aligned and shifted light-emitting elements and light emission adjustment units, with varying shifts and optical-axis angles to align emission angles with the optical system's light-receiving characteristics, reducing color cast and enhancing brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional OLED display structure is used, then display can be achieved, but color cast occurs at large viewing angles
Solution Approach 1:
The patent applies local quality by differentiating the configuration of light emission adjustment units across different regions of the display panel. Specifically, pixel units in the central region have light emission adjustment units coinciding with light-emitting elements, while pixel units in the peripheral region have shifted configurations. This regional differentiation addresses the color cast issue at large viewing angles by optimizing each region's optical characteristics according to its specific viewing angle requirements.
Solution Approach 2:
The patent employs asymmetry by introducing a systematic shift between light emission adjustment units and light-emitting elements in peripheral pixel units. This asymmetric configuration breaks the symmetry present in conventional OLED displays, thereby compensating for the color cast effect that occurs at large viewing angles. The shift amount is specifically designed to counteract the optical interference patterns that cause color cast.
2Manufacturing precision
If light emission adjustment units are shifted to reduce color cast, then viewing angle quality improves, but brightness uniformity may be affected
Solution Approach 1:
The patent resolves the brightness uniformity concern by applying different shift configurations to different regions. Central pixel units maintain coincidence between light emission adjustment units and light-emitting elements to preserve brightness uniformity in the central viewing area. Peripheral pixel units apply the shift only where needed to correct color cast, thus maintaining overall brightness uniformity while improving viewing angle quality.
Solution Approach 2:
The patent utilizes parameter changes by systematically varying the shift amount between light emission adjustment units and light-emitting elements based on the spatial position of pixel units. The shift parameter is adjusted according to the specific location (central vs. peripheral) to optimize both color cast reduction and brightness uniformity. This graded parameter adjustment ensures that brightness remains consistent across the entire display while correcting color cast at large viewing angles.
Data Source
AI summary
A display apparatus includes a first pixel unit located at the center of a display region and at least one second pixel unit located at an edge of the display region. A first light-emitting element in the first pixel and a first light emission adjustment unit corresponding to the first light-emitting element are not shifted from each other. Along a direction in which the first pixel unit points to the second pixel unit, a second light adjustment center of a second light emission adjustment unit in the second pixel unit and a second light-emitting center of a second light-emitting element corresponding to the second light emission adjustment unit are shifted from each other with a shift. The display region includes a shift linear-variation region. In the shift linear-variation region, shifts vary linearly with image heights of pixel units.