AMOLED Pixel Circuit Flicker Reduction via Sub-Phase Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display panels, particularly AMOLED displays in low-frequency modes, suffer from flickering due to leakage currents in the pixel circuit, leading to inconsistent brightness and potential eye strain.
Innovation Solution
The display panel is configured with a pixel circuit that transmits a light-emitting signal during multiple sub-phases within a light-emitting phase, with varying durations to ensure that the brightness difference between sub-phases is minimized, thereby reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pixel circuit uses conventional single-phase light-emitting mode, then the device complexity is low, but the brightness consistency deteriorates due to leakage current
Solution Approach 1:
The light-emitting phase is divided into multiple light-emitting sub-phases (first, second, third sub-phases) with different durations. By segmenting the single phase into multiple sub-phases with varying lengths, the patent compensates for leakage current effects at different time points, achieving better brightness consistency without requiring complex additional hardware circuits.
2Object-affected harmful factors
If the light-emitting signal is transmitted for equal duration in all sub-phases, then the control simplicity is high, but the flicker value increases due to leakage current accumulation
Solution Approach 1:
Different light-emitting sub-phases are assigned different durations according to their specific positions and leakage characteristics. The first sub-phase has a longer duration to compensate for initial leakage, while subsequent sub-phases have progressively shorter durations. This local differentiation of time parameters optimizes brightness consistency and reduces flicker while maintaining simple control logic.
3Loss of energy
If the display panel operates in low-frequency mode, then the power consumption is reduced, but the flickering problem worsens due to extended light-emitting duration
Solution Approach 1:
The patent dynamically adjusts the duration of light-emitting sub-phases based on the operating mode. In low-frequency mode, the light-emitting phase is divided into more sub-phases with varying durations to compensate for leakage current accumulation over extended periods. This dynamic adaptation allows the display to maintain brightness consistency and reduce flicker while operating at lower frequencies, balancing power consumption and display quality.
Data Source
AI summary
A display panel includes a light-emitting element and a pixel circuit electrically connected to each other. In an embodiment, at least one light-emitting phase of the pixel circuit each includes n light-emitting sub-phases, and the pixel circuit is configured to transmit a light-emitting signal to the light-emitting element in at least one of the n light-emitting sub-phases. In an embodiment, a duration ti of transmitting the light-emitting signal to the light-emitting element by the pixel circuit in the ith light-emitting sub-phase of the n light-emitting sub-phases is smaller than a duration tj of transmitting the light-emitting signal to the light-emitting element by the pixel circuit in the jth light-emitting sub-phase of the n light-emitting sub-phases, where 0<ti, 0<tj, 1≤i≤n, l≤j≤n, and i≠j.