Common Electrode Driver for Predictive Charge Compensation
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Solution Overview
Problem
In electronic displays, writing one display pixel can inject charge into a common electrode, affecting the voltage and light emission of other pixels sharing the same electrode, leading to variations in luminance and reduced image quality.
Innovation Solution
A common electrode driver predicts and compensates for charge accumulation by adjusting the common voltage signal based on expected net charge injection, using multiple power supply rails to minimize power consumption and maintain consistent electrode voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel voltage signals are supplied to write display pixels, then image frame is displayed, but charge is injected into the common electrode affecting voltage stability and light emission of other pixels
Solution Approach 1:
The system performs preliminary calculation of expected net charge accumulation before writing the image frame to display pixels. Based on this prediction, the common voltage signal is adjusted in advance to compensate for the anticipated charge injection, thereby maintaining voltage stability and preventing luminance variations in other pixels.
Solution Approach 2:
The system calculates expected charge injection based on image data characteristics and uses this information to dynamically adjust the common voltage signal. This feedback mechanism ensures that the common electrode voltage remains stable despite charge injection from writing different image content to display pixels.
2Reliability
If common voltage signal is adjusted to compensate for charge accumulation, then voltage stability is maintained, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the amplitude of the common voltage signal based on the calculated expected net charge accumulation. Instead of maintaining a fixed high voltage, the common voltage driver changes the voltage parameter adaptively - increasing it only when charge compensation is needed and maintaining lower levels otherwise, thereby reducing overall power consumption while ensuring voltage stability when required.
Data Source
AI summary
Systems and methods are provided for improving displayed image quality of an electronic display with reduced power consumption. In some embodiments, a display pixel in the electronic display includes a pixel electrode and a common electrode. A pixel electrode driver electrically coupled to the first display pixel writes the display pixel by supplying a pixel voltage signal to the pixel electrode. A common electrode driver electrically coupled to the common electrode includes a power amplifier that supplies a common voltage signal to the common electrode to predictively offset net charge accumulation expected in the common electrode; a first power supply rail selectively connectable to the power amplifier based on a target voltage of the common voltage signal; and a second power supply rail selectively connectable to the power amplifier based on the target voltage, in which the first and second power supply rails supply different voltages when connected.