Display Driving Controller for HMD Luminance Compensation
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Solution Overview
Problem
Existing head-mounted display devices suffer from non-uniform luminance distribution across the display area, leading to varying brightness levels depending on the user's position relative to the display panel, which affects the overall display quality and immersion in augmented or virtual reality experiences.
Innovation Solution
A display device with a driving controller that includes a compensation unit to adjust pixel luminance based on distance from a central area, using a lookup table and interpolation methods to calculate compensation values, ensuring uniform luminance across the display panel, which is then enhanced by a lens unit to provide improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a lens unit is used to provide magnification and field of view in a head-mounted display, then the display can be compact and portable, but non-uniform luminance distribution occurs across the display area
Solution Approach 1:
The patent applies local quality by implementing position-dependent luminance compensation. The driving controller calculates compensation values based on the distance of each pixel from the center of the display area, applying different compensation levels to different regions. This resolves the luminance non-uniformity caused by the lens unit while maintaining the compact device design.
Solution Approach 2:
The patent changes the luminance parameter dynamically based on pixel position. By calculating compensation values that vary with distance from the center and applying these to adjust the luminance of different pixel regions, the system compensates for the lens-induced non-uniformity while preserving the compact form factor enabled by the lens unit.
2Device complexity
If the display panel emits light directly without compensation, then the structure is simple, but the luminance varies depending on user position relative to the display panel
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in a lookup table before the display operates. The driving controller uses this pre-prepared compensation data to adjust pixel luminance based on position, achieving uniform luminance output without adding complex real-time calculation hardware during operation.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels and that displays an image in a display area, and a driving controller which receives an image signal, drives the plurality of pixels, where the driving controller includes a compensation unit, and the plurality of pixels include a first pixel disposed in a central area of the display area and a second pixel spaced apart from the central area by a preset distance, the compensation unit outputs compensation data for controlling luminance of the image, and the display panel displays the image, in which a first luminance of the first pixel is less than a second luminance of the second pixel with respect to a same luminance value, based on the compensation data.