Display Device Gray Converter Voltage Domain Compensation
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Solution Overview
Problem
Existing display devices face challenges in applying various gains required by their structure and driving methods due to non-linear compensation grays, making it difficult to achieve optimal luminance and image display.
Innovation Solution
A display device and driving method that calculate linear compensation values in the voltage domain, using a gray converter with components like a voltage domain converter, compensation gray calculator, and gain providers to adjust data voltages based on previous pixel rows, pixel density, and luminance, allowing for flexible application of gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-linear compensation grays are used to compensate for data line voltage drops, then luminance uniformity across the display panel is improved, but it becomes difficult to apply various gains required by different display device structures and driving methods
Solution Approach 1:
The patent changes the parameter domain from gray domain (non-linear) to voltage domain (linear). The compensation values are calculated in the voltage domain where linear interpolation can be applied, then converted back to gray domain for display. This allows various gains to be applied flexibly while maintaining luminance uniformity.
Solution Approach 2:
The patent introduces an intermediary conversion process between gray domain and voltage domain. The gray converter acts as a mediator that transforms compensation grays to compensation voltages, applies linear interpolation in the voltage domain, and converts back to gray domain, enabling flexible gain application while preserving luminance uniformity.
2Manufacturing precision
If compensation values are calculated for all pixels using lookup tables, then luminance uniformity is improved, but memory cost and computational complexity increase
Solution Approach 1:
The patent segments the pixel array into multiple regions (e.g., first region, second region, third region) and calculates compensation values only for representative pixels in each region. These regional compensation values are then applied to all pixels in that region, reducing memory requirements and computational complexity while maintaining luminance uniformity.
Solution Approach 2:
Instead of calculating compensation values for every single pixel, the patent applies partial action by calculating values only for selected representative pixels in each region. This partial calculation approach is sufficient to achieve the desired luminance uniformity without the excessive computational and memory costs of full-pixel calculation.
Data Source
AI summary
A display device includes: a gray converter which adds compensation grays to input grays to provide output grays; a data driver which provides data voltages corresponding to the output grays; and a display panel which includes pixels which receives the data voltages, where the gray converter includes: a voltage domain converter which converts the input grays into conversion grays; and a compensation gray calculator which calculates the compensation grays based on the conversion grays.