Head-Mounted Display Brightness Control for HDR Glare Reduction
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Solution Overview
Problem
Head-mounted displays cause excessive visual stimuli leading to glare and potential health hazards due to direct light emission, while the demand for utilizing wide brightness ranges, such as HDR, is increasing for richer image expression, necessitating a balance between expanding brightness and reducing health risks.
Innovation Solution
An image display system with a head-mounted display and image generation device that independently adjusts brightness through pixel values and light emission, allowing users to control brightness reduction via separate mechanisms to avoid health hazards and maintain optimal image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the brightness range is expanded to utilize HDR for richer image expression, then the image quality and visual realism are improved, but the risk of causing glare and health hazards increases
Solution Approach 1:
The patent divides brightness control into two independent sections: pixel value brightness (image content brightness) and light emission brightness (display panel output brightness). This segmentation allows each to be optimized independently - pixel values can maintain HDR range for rich expression while light emission brightness is controlled to safe levels, resolving the contradiction between image quality and health safety
Solution Approach 2:
The patent introduces independent control parameters for pixel brightness and light emission brightness. By changing these parameters separately, the system can maintain high pixel brightness values for HDR content while limiting the actual light emission to safe levels, thus achieving both rich image expression and glare prevention
2Object-affected harmful factors
If the light emission brightness is reduced to avoid health hazards, then the safety and comfort are improved, but the image quality and visual impact deteriorate
Solution Approach 1:
By segmenting brightness control into pixel value adjustment and light emission adjustment, the patent preserves image quality information in the pixel values while independently controlling light emission to safe levels. This allows the system to maintain visual richness without compromising health safety
Solution Approach 2:
The patent uses pixel values as an intermediary that carries the full HDR brightness information, while a separate light emission control mechanism acts as a mediator to limit the actual light output. This intermediary approach allows the system to preserve image quality data while controlling physical light emission to safe levels
Data Source
AI summary
An image generation device 200 processes content to draw an image (step S22), and corrects the image as needed for display (step S24). When drawing the image, the image generation device 200 adjusts a tone curve according to a user operation for adjusting the brightness expressed by pixel values (step S20). A head-mounted display 100 generates a drive voltage corresponding to the pixel values of image data acquired from the image generation device 200 (step S28) and drives a display panel to display the image (step S30). When generating the drive voltage, the head-mounted display 100 decreases the drive voltage to a ratio based on a user operation for reducing light emission brightness of the display panel (step S26).