Pixel Compensation Voltage for Display Panel Deviation
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Solution Overview
Problem
Existing display technologies face challenges in compensating for threshold voltage variations between pixels and display panels, leading to increased costs and power consumption in data drivers due to the need for wide voltage ranges.
Innovation Solution
A display device and pixel structure that use different voltages to compensate for threshold voltage deviations between pixels and panels, with a panel deviation compensation voltage generated based on average or median threshold voltage distributions, reducing the voltage range required for data drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If external compensation method is used to compensate for threshold voltage deviation, then pixel structure complexity is reduced and no threshold voltage compensation period is required, but data driver voltage range must be widened covering both pixel-to-pixel and panel-to-panel deviations
Solution Approach 1:
The patent segments the threshold voltage compensation into two independent parts: pixel-to-pixel deviation compensation handled by the data driver, and panel-to-panel deviation compensation handled by a separate panel compensation voltage generator. This segmentation allows each component to operate within a narrower, more efficient voltage range while achieving comprehensive compensation.
Solution Approach 2:
The patent introduces a panel compensation voltage generator as an intermediary component that specifically handles panel-to-panel threshold voltage deviations. This intermediary device offloads the panel-level compensation task from the data driver, allowing the data driver to focus only on pixel-to-pixel compensation with a reduced voltage range.
2Reliability
If data driver covers wide voltage range for external compensation, then panel-to-panel and pixel-to-pixel threshold voltage deviations are compensated, but data driver cost and power consumption increase
Solution Approach 1:
The patent segments the compensation function between the data driver and panel compensation voltage generator, allowing the data driver to operate with a reduced voltage range. This segmentation directly reduces the power consumption and cost of the data driver while maintaining comprehensive compensation accuracy through the combined operation of both components.
Data Source
AI summary
A pixel of a display panel includes a storage capacitor, at least one scan transistor to transfer first and second voltages to ends of the storage capacitor in response to a scan signal, a driving transistor to generate a driving current based on a difference between the first voltage and the second voltage stored in the storage capacitor, at least one emission transistor to selectively provide the driving current to an organic light emitting diode in response to an emission control signal, and the organic light emitting diode to emit light, wherein the first voltage is a sum of a data voltage and a pixel deviation compensation voltage for compensating a threshold voltage deviation between pixels included in the display panel, and wherein the second voltage is a panel deviation compensation voltage for compensating a threshold voltage deviation between display panels manufactured by a same process for the display panel.