Transparent Display Brightness Compensation Circuit
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Solution Overview
Problem
Current transparent display technologies face issues with sub-ideal uniformity of brightness levels due to the side-arrangement of light sources in transparent waveguide display panels, leading to varying brightness levels across different regions based on distance from the light source.
Innovation Solution
A circuit and method that divides the display panel into sub-regions, calculates average brightness values, and compensates pixel brightness by adjusting input voltage or effective light output area to achieve uniformity, using a pre-stored look-up table and compensating pixels to ensure consistent brightness across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are arranged at the side of the transparent waveguide display panel, then the display can achieve light transmittance characteristics, but the brightness uniformity across different regions deteriorates
Solution Approach 1:
The display panel is divided into multiple sub-regions (first sub-region, second sub-region, third sub-region, fourth sub-region) based on their distance from the light source. Each sub-region is independently controlled with different input voltages to compensate for brightness differences, thereby improving overall brightness uniformity while maintaining the side-arranged light source structure.
Solution Approach 2:
Different sub-regions of the display panel are assigned different input voltage values according to their specific brightness characteristics. Regions farther from the light source receive higher input voltages to compensate for lower brightness, while regions closer to the light source receive lower input voltages. This localized adjustment improves brightness uniformity without changing the overall display structure.
2Illumination intensity
If different input voltages are applied to different sub-regions to improve brightness uniformity, then brightness uniformity improves, but the complexity of the driving circuit increases
Solution Approach 1:
The optimal input voltage values for each sub-region are pre-determined and stored in a look-up table during the design phase. During operation, the driving circuit simply retrieves the appropriate voltage values from the look-up table based on the active sub-region, avoiding complex real-time calculations and reducing driving circuit complexity while maintaining brightness uniformity.
Solution Approach 2:
The complex real-time voltage adjustment mechanism is replaced by a pre-computed look-up table stored in memory. The driving circuit transitions from performing complex calculations to simply reading pre-stored values, significantly reducing circuit complexity while achieving the same brightness uniformity improvement.
3Illumination intensity
If the display panel is divided into more sub-regions for finer brightness control, then brightness uniformity improves, but the device complexity and control difficulty increase
Solution Approach 1:
The display panel is divided into an asymmetric number of sub-regions (four sub-regions) based on the geometric relationship with the side-arranged light source. This asymmetric division optimally balances the brightness compensation needs across different regions while keeping the control scheme manageable, avoiding both oversimplification and excessive complexity.
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 significantly improves the uniformity of brightness levels across the display panel by dynamically adjusting pixel brightness based on calculated average values, enhancing the display's overall image quality and consistency.
Implementation Method 1
a voltage can be applied to a pre-set region of the above mentioned waveguide transparent display layer to thereby cause the liquid crystal molecules to deflect
Implementation Method 2
the alignment of the liquid crystal molecules is chaotic and the light emitted is diffused
Implementation Method 3
compensate for the non-uniformity of the brightness level of the image to be displayed by adjusting the input voltage to the liquid crystal cells
Data Source
AI summary
A circuit and method facilitate driving a display panel to display an image with improved brightness uniformity are disclosed. In the circuit, an image information extraction sub-circuit extracts, and sends to a compensation processing sub-circuit, display information of each of the plurality of pixels based on the image. The compensation processing sub-circuit then divides a display region of the display panel into a plurality of sub-regions, obtains an average brightness value of each sub-region, and further determines whether a compensation is needed for displaying the image based on a uniformity of the average brightness values of all sub-regions. If so, the compensation processing sub-circuit further performs compensation to an input voltage and/or an effective light output area of each of the pixels to be lightened in each sub-region to thereby obtain an improved brightness uniformity when displaying the image.