Pixel Circuit Compensation for Display Brightness Uniformity
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Solution Overview
Problem
Transmission loss during the writing stage of a pixel circuit leads to undesirable light-emitting effects, causing shifts in brightness and poor display performance.
Innovation Solution
A compensation method for pixel circuits that involves determining a compensation coefficient based on the gate and source potentials of a driving transistor during the writing stage, and using this coefficient to adjust the light-emitting current in the light-emitting stage, thereby compensating for transmission loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission loss is not compensated, then the pixel circuit structure remains simple, but brightness uniformity deteriorates
Solution Approach 1:
The patent pre-calculates and stores compensation coefficients in a lookup table during the design phase, based on different gate-source potential differences. During operation, the system only needs to query the pre-computed table rather than performing complex real-time calculations, thus achieving brightness compensation while maintaining operational simplicity
Solution Approach 2:
The patent creates a simplified model by establishing a functional relationship between gate-source potential difference and light-emitting current, then uses this model to generate compensation coefficients that are stored in a table. This copied model allows fast retrieval without complex physical calculations during actual display operation
2Reliability
If real-time compensation calculation is performed, then brightness uniformity improves, but calculation time increases
Solution Approach 1:
The compensation coefficients are pre-calculated and stored in a lookup table before the display operates. During actual operation, the system only performs a simple table lookup based on the measured gate-source potential difference, avoiding time-consuming real-time calculations while still achieving accurate brightness compensation
Solution Approach 2:
The patent uses a simple lookup table structure that requires minimal computational resources during operation. Instead of performing complex iterative calculations in real-time, the system uses pre-computed values that can be quickly retrieved, significantly reducing the time loss while maintaining compensation effectiveness
3Measurement precision
If transmission loss compensation is implemented, then light-emitting current accuracy improves, but the control system complexity increases
Solution Approach 1:
The patent creates a simplified functional model that copies the essential relationship between gate-source potential difference and light-emitting current. This model is used to generate compensation coefficients stored in a lookup table, allowing accurate current control without implementing a complex real-time control system
Solution Approach 2:
The patent replaces complex real-time control calculations with a pre-computed lookup table approach. Instead of using a complex control system that performs iterative calculations, the system substitutes this with a simple table lookup mechanism that achieves the same control accuracy with much lower computational complexity
Data Source
AI summary
A compensation method a pixel circuit and a display panel are provided. In the compensation method, a gate potential and a source potential of a driving transistor in a writing stage are obtained and a compensation coefficient of the pixel circuit is determined, and then a light-emitting current flowing through the driving transistor in a light-emitting stage is determined based on the compensation coefficient, the gate potential and the source potential of the driving transistor in the writing stage. The compensation coefficient can adjust transmission loss of the gate potential and the source potential of the driving transistor in the writing stage, so as to ensure that the light-emitting current flowing through the driving transistor in the light-emitting stage is desired, without causing the phenomenon of shift in brightness.