OLED Pixel Circuit Energy Storage Control for Flicker Reduction
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Solution Overview
Problem
Existing OLED displays face issues with flicker phenomena and brightness differences in low-frequency and variable frequency driving, leading to increased IC power consumption and visual artifacts.
Innovation Solution
A pixel circuit with an energy storage control circuit, initialization circuits, and light-emitting control circuits that manage voltage connections and disconnections during refresh and hold frames to reset the control terminal and electrode, reducing voltage rewriting and improving flicker performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-frequency driving is implemented to reduce power consumption, then energy efficiency improves, but flicker phenomena and brightness differences occur
Solution Approach 1:
The patent implements dynamic control of the energy storage circuit by switching between connection and disconnection states based on frame type (refresh frame vs. hold frame). The energy storage control circuit dynamically adjusts the connection between the energy storage circuit and voltage terminal, enabling adaptive power management that reduces consumption during hold frames while maintaining display stability during refresh frames.
Solution Approach 2:
The patent employs periodic refresh frames interspersed with hold frames to maintain display stability. By periodically refreshing the display at specific intervals rather than continuous operation, the system achieves lower average power consumption while preventing flicker phenomena through the periodic restoration of proper voltage levels in the energy storage circuit.
2Adaptability or versatility
If variable frequency driving is used to optimize performance, then display adaptability improves, but brightness differences and visual artifacts increase
Solution Approach 1:
The patent changes the operational parameters of the energy storage circuit based on driving frequency requirements. By adjusting the connection/disconnection timing and duration of the energy storage circuit in response to different frame rates, the system adapts to variable frequency driving while maintaining consistent brightness output and avoiding visual artifacts.
3Reliability
If the energy storage circuit remains connected to maintain voltage stability, then display stability improves, but power consumption increases
Solution Approach 1:
The patent segments the display operation into distinct refresh frames and hold frames, with corresponding segmentation of the energy storage circuit operation. During refresh frames, the energy storage circuit is connected to maintain voltage stability. During hold frames, the circuit is disconnected to reduce power consumption, relying on the previously stored energy to maintain operation without continuous power supply.
Data Source
AI summary
A pixel circuit, a pixel drive method and a display device are provided. The pixel circuit includes an energy storage control circuit, an energy storage circuit, a first initialization circuit, a drive circuit, and a light-emitting element. The first initialization circuit writes a first initial voltage into a control terminal of the drive circuit under control of a first initialization control signal. The energy storage control circuit control a second end of the energy storage circuit to be connected to the first voltage terminal under control of an energy storage control signal in a refresh frame, and is configured to control the second end of the energy storage circuit to be disconnected from the first voltage terminal under control of the energy storage control signal in an initialization phase included in a hold frame and a data writing phase included in the hold frame.