Display Panel Voltage Interpolation for Uniform Luminance
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Solution Overview
Problem
The existing display devices suffer from luminance uniformity issues due to large step sizes between voltage levels for pixel driving, leading to non-uniform image brightness.
Innovation Solution
A display device with a voltage generator and interpolator that generates and distributes interpolation voltage levels between representative luminance levels, using a voltage distribution circuit with resistors to create uniform luminance across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gamma voltages are generated for entire grayscales, then the data driver can output data signals for all luminance levels, but the step size between voltages becomes large compared to the step size between gamma voltages, causing luminance uniformity deterioration
Solution Approach 1:
The voltage generation process is segmented into two stages: first generating gamma voltages for representative luminance levels, then using a voltage interpolator to generate intermediate voltages for all luminance levels. This segmentation allows the system to maintain precise voltage control across all luminance levels without requiring a single complex voltage generation process.
Solution Approach 2:
A voltage interpolator is introduced as an intermediary component between the voltage generator and the display panel. The voltage interpolator receives gamma voltages corresponding to representative luminance levels and generates interpolation voltages for all luminance levels, thereby bridging the gap between coarse gamma voltage levels and fine luminance requirements.
2Ease of manufacture
If large step sizes between voltages are used for pixel driving, then the voltage generation process is simplified, but luminance uniformity according to image brightness value deteriorates
Solution Approach 1:
The voltage generation process is divided into two sequential stages: first generating gamma voltages with larger step sizes for representative luminance levels (simplifying the process), then using a voltage interpolator to create fine-grained interpolation voltages for all luminance levels (improving precision). This segmentation allows the system to benefit from both simplicity and precision.
Solution Approach 2:
The voltage interpolator performs preliminary generation of gamma voltages for representative luminance levels before generating the final interpolation voltages for all luminance levels. This preliminary action simplifies the overall process by establishing a coarse voltage framework first, which is then refined through interpolation.
3Quantity of substance
If representative luminance levels are used for voltage generation, then the voltage generator output is reduced, but the luminance uniformity across the display panel deteriorates
Solution Approach 1:
The voltage generation process is segmented into two stages: first generating voltages for representative luminance levels (reducing the quantity of voltages needed), then using a voltage interpolator to generate additional voltages for all luminance levels (increasing the quantity to achieve uniform luminance). This segmentation allows the system to efficiently manage voltage generation while maintaining luminance uniformity.
Solution Approach 2:
A voltage interpolator is introduced as an intermediary that expands the limited set of representative voltage levels into a comprehensive set of interpolation voltages for all luminance levels. This intermediary component enables the system to maintain uniform luminance across the display panel without requiring the voltage generator to produce all possible voltages directly.
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 uniform luminance across the display by providing voltages corresponding to specific luminance levels, preventing deterioration of image brightness uniformity.
Implementation Method 1
a voltage distribution circuit including y resistors connected in series between a first node and a ground node, and outputting a plurality of interpolation voltage levels
Data Source
AI summary
A display device may include a display panel including a plurality of sub-pixels, a voltage generator configured to generate a first voltage including first voltage levels, the first voltage levels corresponding to representative luminance levels among luminance levels, and a voltage interpolator configured to output interpolation voltage levels corresponding to the luminance levels to the display panel, based on the first voltage levels, and the luminance levels may be values obtained by converting luminances of an image displayed on the display panel into a digital form.