Pixel Compensation Circuit Current-Type External Method
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Solution Overview
Problem
Existing voltage-type external compensation methods for AMOLED displays are prone to interference and face accuracy challenges due to increasing parasitic capacitance and resolution, which affects display uniformity and aperture ratio, especially in large-size and high-resolution applications.
Innovation Solution
A pixel compensation circuit employing a current-type external compensation method that integrates the driving current of the pixel circuit to output a voltage, compares it with a reference voltage, and uses timing and processing to obtain a working duration and compensation parameter, thereby avoiding signal interference and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage-type external compensation method is used, then compensation can be implemented, but measurement precision and reliability deteriorate due to signal interference from parasitic capacitance in high-resolution displays
Solution Approach 1:
The patent replaces the voltage-type measurement system with a current-type measurement system. Instead of measuring voltage signals that are susceptible to parasitic capacitance interference, the system measures driving current through an integration circuit that converts current to voltage for processing. This substitution of measurement type eliminates the harmful interference effect while maintaining compensation functionality.
Solution Approach 2:
The patent introduces an integration circuit as an intermediary between the pixel circuit and the measurement system. This integration circuit converts the driving current into a voltage signal that can be processed by the timing circuit and processor, while the current-type measurement approach acts as an intermediary mechanism that avoids direct voltage measurement and its associated parasitic capacitance problems.
2Manufacturing precision
If resolution is increased for high-definition display, then display quality improves, but device complexity and measurement difficulty increase due to increased parasitic capacitance
Solution Approach 1:
The patent substitutes voltage-based measurement with current-based measurement to overcome the measurement difficulties arising from high resolution. The integration circuit measures current flow through the pixel circuit, which is less affected by parasitic capacitance effects that become more significant at higher resolutions, thereby simplifying the measurement process despite increased display quality requirements.
3Manufacturing precision
If aperture ratio is increased for better display performance, then display quality improves, but compensation accuracy deteriorates due to reduced area for compensation circuits
Solution Approach 1:
The patent extracts the measurement function from the pixel circuit area by using an external integration circuit and timing circuit. Instead of incorporating complex compensation circuits within the pixel that would consume area, the system extracts the measurement and compensation functions to external circuits, allowing for higher aperture ratios while maintaining compensation accuracy through the current-type measurement approach.
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 current-type external compensation method enhances the accuracy and speed of compensation, reducing interference and improving display uniformity and aperture ratio, even in high-resolution displays, by directly measuring driving current and converting it into a digital signal for processing.
Implementation Method 1
the integration circuit is configured to integrate a driving current of the pixel circuit to output a first voltage
Implementation Method 2
the comparison circuit is configured to receive the first voltage and compare the first voltage with a first reference voltage, and output a first logic control signal
Data Source
AI summary
A pixel compensation circuit includes: an integration circuit, a comparison circuit, a timing circuit, and a processor, wherein the integration circuit is configured to integrate driving currents of a pixel circuit, and then output a first voltage; the comparison circuit is configured to receive the first voltage, compare the first voltage with a first reference voltage, and then output a first logic control signal; the timing circuit is configured to acquire a first working duration; and the processor is configured to acquire the first working duration, obtain, according to correlations between the pre-obtained working duration and the pixel driving currents, a target driving current, corresponding to the first working duration, of the pixel circuit, and obtain a compensation parameter according to the target driving current.