Pixel Circuit Hysteresis Compensation via Alternating Frame Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in improving display quality due to the hysteresis of transistors in pixels, which affects the timing of compensation signals.
Innovation Solution
A display device is designed with a pixel circuit that includes multiple transistors and compensation transistors, where the panel driver maintains specific compensation scan signals in inactive states during alternating frames to compensate for transistor hysteresis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If compensation scan signals are applied continuously to compensate for transistor hysteresis, then display quality improves, but the timing and synchronization of pixel operations deteriorates due to insufficient compensation time in each frame
Solution Approach 1:
The pixel circuit is divided into multiple independent transistor units (first driving transistor, second driving transistor, first compensation transistor, second compensation transistor) that operate in alternating frames. This segmentation allows each transistor to be compensated separately at different times, resolving the timing conflict while maintaining overall display quality.
Solution Approach 2:
The compensation operation is performed periodically with alternating frames: odd frames compensate the first driving transistor while even frames compensate the second driving transistor. This periodic alternating compensation ensures each transistor receives adequate compensation time without affecting the overall frame rate and display quality.
2Manufacturing precision
If multiple compensation transistors are added to compensate for hysteresis, then display quality improves, but device complexity increases
Solution Approach 1:
The first and second compensation transistors serve dual purposes: they compensate for hysteresis in their respective driving transistors and also function as part of the alternating frame operation mechanism. This multi-functionality reduces the need for additional dedicated compensation components, thereby limiting the increase in device complexity.
3Reliability
If alternating frame compensation is implemented, then hysteresis compensation effectiveness improves, but the control signal timing complexity increases
Solution Approach 1:
The panel driver is configured to maintain compensation scan signals in inactive states in advance during alternating frames. This preliminary action ensures that compensation operations are timed correctly without requiring complex real-time timing adjustments, simplifying the control signal timing while maintaining compensation effectiveness.
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
This solution effectively improves display quality by ensuring sufficient time for hysteresis compensation, reducing after-image phenomena and enhancing overall image clarity.
Implementation Method 1
A light emitting display device display images by using a light emitting diode that generates a light through the recombination of electrons and holes
Data Source
AI summary
A display device includes: a light emitting element; a first driving transistor between a first node and the light emitting element; a second driving transistor between the first node and the light emitting element; a switching transistor between a data line and the first node; a first compensation transistor between a first control electrode of the first driving transistor and a second node, and configured to receive a first compensation scan signal; a second compensation transistor between a second control electrode of the second driving transistor and the second node, and configured to receive a second compensation scan signal; a first initialization transistor between the first control electrode of the first driving transistor and a first initialization voltage line; and a second initialization transistor between the second control electrode of the second driving transistor and a second initialization voltage line.