OLED Surface Backlight Driving for XR 3D Viewing and Low Power
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Solution Overview
Problem
Existing display devices for extended reality content images, such as holograms, face challenges in optimizing the light emitting pixel arrangement and surface light emission driving methods, which affect the display quality, viewing angle, and three-dimensional effect, while also increasing power consumption.
Innovation Solution
A display device with a surface light source device that includes an organic light emitting display unit with a specific pixel arrangement and emission driving circuit, controlling light emitting pixels for each emission area to provide ultra-low resolution background light to a spatial light modulator, improving driving efficiency and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional backlight structure is used, then the display device can provide uniform background light, but the light emitting pixels are arranged in a regular grid pattern which limits the three-dimensional effect and viewing angle
Solution Approach 1:
The patent applies asymmetry by arranging light emitting pixels in an irregular, non-grid pattern on the backlight. This asymmetric arrangement allows different spatial frequencies and angles of light emission, enhancing the three-dimensional effect and viewing angle while maintaining uniform background light through compensatory control algorithms that balance the overall luminance distribution.
Solution Approach 2:
The patent implements local quality by allowing different regions of the backlight to have different pixel densities and emission characteristics. The irregular pixel arrangement enables local optimization where certain areas have higher pixel concentrations for detailed regions while other areas use sparser arrangements, improving both the three-dimensional effect and power efficiency.
2Manufacturing precision
If high resolution light emitting pixels are used, then the display quality is improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies partial action by using an irregular pixel arrangement that provides sufficient resolution only where needed for the holographic display's three-dimensional effect. Rather than uniformly high resolution across the entire backlight, the irregular pattern concentrates pixels in critical areas while reducing them in others, maintaining display quality while significantly reducing overall power consumption.
Solution Approach 2:
The patent changes the parameter of pixel arrangement from regular grid to irregular pattern, which fundamentally alters how resolution is achieved. This parameter change allows the system to maintain effective display quality through the irregular spatial distribution's ability to create fine angular variations, while using fewer total pixels and thus consuming less power.
3Ease of manufacture
If regular grid pattern light emitting pixels are used, then the manufacturing is simplified, but the viewing angle and three-dimensional effect are limited
Solution Approach 1:
The patent deliberately introduces asymmetry in the pixel arrangement to overcome the limitations of regular grids. The irregular pattern is designed to create multiple emission angles and spatial frequencies, expanding the viewing angle and three-dimensional effect. While manufacturing becomes slightly more complex, the patent maintains ease of manufacture by using standardized pixel components and simplified control algorithms that compensate for the irregular arrangement.
4Device complexity
If all light emitting pixels are driven simultaneously, then the control is simple, but the power consumption is high and the light emission uniformity is poor
Solution Approach 1:
The patent applies segmentation by dividing the backlight into multiple independently controllable pixel regions with irregular arrangement. Instead of driving all pixels simultaneously, the control algorithm activates specific pixel groups based on the required spatial pattern, reducing power consumption. The segmentation is managed through a control algorithm that coordinates pixel activation sequences, maintaining simplicity while achieving uniform light emission and low power usage.
Solution Approach 2:
The patent implements periodic action through time-multiplexed pixel driving, where different pixel groups are activated in sequential periods rather than simultaneously. This periodic activation pattern, coordinated by a control algorithm, creates the perception of uniform continuous light while actually consuming power only during active periods, significantly reducing overall power consumption.
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
Enhances the three-dimensional effect of extended reality content images and reduces power consumption by optimizing the light emitting pixel arrangement and surface light emission driving method.
Implementation Method 1
an organic light emitting display unit including a plurality of light emitting pixels performing a surface emission
Data Source
AI summary
The present disclosure relates to a display device. The display device includes at least one spatial light modulator displaying an extended reality content image, a surface light source device providing image display light from the rear direction of the at least one spatial light modulator to the spatial light modulator as background light, and at least one image transmission member forming a display path of the extended reality content image. The surface light source device includes an organic light emitting display unit including a plurality of light emitting pixels performing a surface emission. The surface light source device includes an emission driving circuit supplying an emission control voltage and each of scan timing control signals to the plurality of light emitting pixels to control a light emitting operation of the plurality of light emitting pixels.