Backlight Assembly Non-Uniform Brightness Offset
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) suffer from non-uniform brightness issues due to components in the optical path, leading to degraded image quality when viewed from different angles, causing significant brightness variations that affect user experience.
Innovation Solution
A backlit display system incorporating a backlight assembly with an array of LEDs and a brightness enhancement film, configured to produce a non-uniform brightness distribution that offsets errors in brightness distribution caused by the display panel and optics block, resulting in a target brightness distribution that remains consistent across various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight assembly with uniform brightness is used, then the display panel receives uniform light, but the optics block causes non-uniform brightness distribution in the final image due to viewing angle dependencies
Solution Approach 1:
The backlight assembly implements non-uniform local brightness distribution by configuring LEDs with different luminous intensities at different positions. Specifically, LEDs in the vertical direction are set with varying brightness levels to compensate for the optics block's viewing angle dependency, creating a pre-corrected brightness profile that results in uniform overall image brightness
Solution Approach 2:
The system applies preliminary compensation by designing the backlight brightness distribution to be non-uniform in a way that anticipates and counteracts the brightness non-uniformity introduced by the optics block. The backlight's non-uniform profile is specifically engineered to offset the optical path's viewing angle effects, preventing image quality degradation before it occurs
2Area of moving object
If the optics block magnifies image light for better visibility, then the image is enlarged, but brightness distribution becomes non-uniform due to optical path effects
Solution Approach 1:
The backlight assembly implements non-uniform local brightness distribution by configuring LEDs with different luminous intensities at different positions. Specifically, LEDs in the vertical direction are set with varying brightness levels to compensate for the optics block's viewing angle dependency, creating a pre-corrected brightness profile that results in uniform overall image brightness
Solution Approach 2:
The non-uniform brightness distribution is established in advance by the backlight assembly before light passes through the optics block. By pre-configuring the LED array with specific brightness patterns, the system prepares the light field to be properly distributed after magnification, preventing brightness non-uniformity from developing during the optical process
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 ensures a substantially uniform image brightness distribution at the eyebox, minimizing variations as the user's viewing angle changes, thereby enhancing image quality and user experience by correcting brightness inconsistencies introduced by the display panel and optics block.
Implementation Method 1
The backlight assembly includes an array of light emitting diodes (LEDs)
Implementation Method 2
The non-uniform brightness distribution of the light can offset errors in the brightness distribution of the image light caused by the optics block and/or the display panel
Implementation Method 3
configurations of the at least one brightness enhancement film
Data Source
AI summary
A headset includes a backlight assembly, a display panel, and an optics block. The backlight assembly includes an array of light emitting diodes (LEDs), a diffusing element, and a brightness enhancement film. The array of LEDs and the brightness enhancement film are configured in a way such that the light generated by the backlight assembly has a non-uniform brightness distribution. The display panel receives the light and convert the light to image light. The image light has at least the non-uniform brightness distribution. The optics block includes one or more optical elements that direct the image light to an eyebox of the headset. The optics block adds another non-uniform brightness distribution to the image light to offset the non-uniform brightness distribution from the backlight assembly, such that the image light directed to the eyebox has a target brightness distribution.