HMD Display Illumination Control via Concentric Light Regulation
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Solution Overview
Problem
Conventional liquid-crystal displays in head-mounted displays face a trade-off between high resolution, which degrades light transmittance and brightness, and increased power consumption when attempting to enhance brightness by increasing LED light emission.
Innovation Solution
A display device with a control substrate that regulates light emission across concentric sections of the display panel, providing more light to the center and less to the periphery, using LEDs grouped and connected in series, and a light-source driving unit to manage current, thereby optimizing brightness and reducing power consumption based on human eye characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the liquid-crystal display is enhanced to have high resolution, then the display quality is improved, but the light transmittance is degraded
Solution Approach 1:
The patent applies local quality by varying the light emission intensity across different regions of the display. The center region (where the user's eye is focused) receives higher light intensity, while the peripheral regions receive lower light intensity. This regional differentiation resolves the contradiction by providing sufficient brightness in the critical viewing area without requiring maximum light emission across the entire high-resolution display, thus maintaining both display quality and light transmittance efficiency.
2Illumination intensity
If the amount of light emitted from LEDs is increased to avoid brightness reduction, then the brightness is improved, but the power consumption is increased
Solution Approach 1:
The patent implements local quality by controlling LED light emission intensity according to spatial position. The LEDs corresponding to the center display region emit higher intensity light to ensure adequate brightness, while LEDs for peripheral regions emit lower intensity light. This spatially differentiated approach maintains acceptable brightness in the critical viewing area while significantly reducing overall power consumption compared to uniform high-intensity illumination across the entire display.
3Ease of manufacture
If the light emission is regulated uniformly across the display, then the manufacturing is simplified, but the display quality in peripheral areas is degraded
Solution Approach 1:
The patent applies local quality by implementing region-specific light emission control where the display is divided into a center region and peripheral regions. The control substrate regulates light intensity differently for each region, providing higher intensity to the center and lower intensity to the periphery. This approach maintains ease of manufacture through systematic control while significantly improving display quality in the critical viewing area compared to uniform light emission.
Solution Approach 2:
The patent employs segmentation by dividing the display into multiple regions (center and peripheral areas) with different light emission requirements. This segmentation allows independent optimization of light intensity for each region, enabling the center region to achieve high display quality while the peripheral regions consume less power, thus resolving the contradiction between manufacturing simplicity and display quality.
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 configuration enhances display quality at the center of view while reducing power consumption and minimizing visible brightness degradation at the periphery, preventing quality degradation that is not visually noticeable.
Implementation Method 1
the light sources are LEDs
Data Source
AI summary
A display device includes: a display panel including a display region for image display; an illumination device including a plurality of light sources, the illumination device being configured to cast light upon the display panel; and a control substrate including a regulator configured to regulate an amount of light emitted from the plurality of light sources, wherein the display region is sectioned into a plurality of sections in a form of concentric circles, and the regulator regulates the amount of light in such a manner that one of the plurality of sections that is adjacent to a middle of the concentric circles is irradiated with a relatively large amount of light, and in such a manner that another one of the plurality of sections that is adjacent to an outer edge of the concentric circles is irradiated with a relatively small amount of light.