Pixel Circuit Scan Frequency Control for Mura Suppression
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Solution Overview
Problem
Display apparatuses suffer from mura phenomenon and image defects such as flicker and after-images due to varying frame frequencies, which affect image quality.
Innovation Solution
A pixel circuit design that includes specific transistors and power lines, allowing control over the supply frequency of scan signals based on frame frequency, with varying frequencies in different modes to stabilize transistor bias and reduce mura phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus operates at varying frame frequencies, then the adaptability to different display modes is improved, but the mura phenomenon and image defects occur due to unstable transistor bias
Solution Approach 1:
The pixel circuit dynamically adjusts the supply frequency of the fourth scan signal based on the frame frequency. When the frame frequency varies, the circuit automatically changes the scanning frequency to maintain stable transistor bias, preventing mura phenomenon while adapting to different display modes
Solution Approach 2:
The invention changes the frequency parameter of the fourth scan signal in response to frame frequency variations. By adjusting this parameter, the transistor bias is stabilized across different operating conditions, resolving the contradiction between adaptability and image quality stability
2Reliability
If the fourth scan signal is supplied at high frequency, then the transistor bias stability is improved, but the power consumption increases
Solution Approach 1:
The supply frequency of the fourth scan signal is dynamically adjusted based on actual display needs. The frequency is increased only when necessary to maintain transistor bias stability, and reduced when stable operation is already achieved, optimizing the balance between reliability and power consumption
Solution Approach 2:
The frequency parameter of the fourth scan signal is changed adaptively rather than maintained at a constant high value. This parameter adjustment maintains transistor bias stability while reducing unnecessary power consumption during normal operating conditions
Data Source
AI summary
The pixel circuit and a display apparatus including the same are disclosed. A supply frequency of a fourth scan signal which is supplied to the pixel may be controlled, in response to a frame frequency (or a supply frequency of a second scan signal) of the display apparatus. The pixel circuit and the display apparatus including the same may be driven at various frame frequencies and suppress the mura phenomenon which may be visible to the user.