OLED Driving Circuit for Selective Pixel Voltage Refresh
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Solution Overview
Problem
In OLED displays, particularly in AOD screens or static screens, most pixel circuits do not require voltage updates, leading to unnecessary power consumption due to repeated refresh, which is inefficient and wasteful.
Innovation Solution
A driving circuit with a first driving signal generation circuit, first output control circuit, first gating circuit, first energy storage circuit, and first output circuit, which control the connection and potential of nodes to optimize pixel voltage updates, reducing unnecessary refresh and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pixel circuits are repeatedly refreshed to maintain display brightness, then display stability is improved, but power consumption increases
Solution Approach 1:
The patent implements partial refresh by dividing the display screen into multiple regions and selectively refreshing only certain regions rather than the entire screen. The driving circuit controls different pixel circuits to operate at different refresh frequencies, with some pixels refreshed at full rate while others are refreshed less frequently or not at all, thereby reducing overall power consumption while maintaining acceptable display stability.
Solution Approach 2:
The patent employs periodic refresh with variable periods by controlling pixel circuits to operate at different refresh rates. The driving circuit enables some pixel circuits to be refreshed at standard frame rates while others operate at lower refresh rates or remain static, creating a periodic action pattern that reduces average power consumption while maintaining display stability for actively changing regions.
2Productivity
If all pixel circuits are updated within one frame time, then display completeness is improved, but power consumption increases due to unnecessary updates
Solution Approach 1:
The patent segments the display refresh operation by dividing pixel circuits into different groups or regions that can be refreshed independently. The driving circuit controls different segments of the display with different refresh schedules, allowing complete display updating when necessary while enabling selective partial refreshing to reduce power consumption during static or minimally changing display content.
Solution Approach 2:
The patent applies partial action by updating only the necessary portion of pixel circuits within each frame time rather than refreshing all pixels. The driving circuit identifies which pixel circuits require updates based on display content changes and selectively applies refresh signals only to those regions, maintaining display completeness for changed areas while avoiding unnecessary power consumption from updating static areas.
3Use of energy by moving object
If LTPO TFT is used to maintain pixel voltage, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent implements dynamic operation by enabling pixel circuits to switch between different operating modes or refresh rates. The driving circuit dynamically adjusts the refresh frequency of different pixel circuits based on display content requirements, allowing the system to optimize power consumption while maintaining necessary display updates, thereby achieving energy efficiency without requiring fundamentally more complex hardware components.
Data Source
AI summary
A driving circuit includes a first driving signal generation circuit, a first output control circuit and a first output circuit; N is a positive integer; the first gating circuit controls to write the gating input signal into the first first node under the control of the gating control signal; the first output circuit controls to connect the Nth stage of output driving terminal and the first voltage terminal under the control of the potential of the first second node, and controls to connect the Nth stage of output driving terminal and the second voltage terminal under the control of the potential of the first third control node; the first third control node and the first second control node are different nodes.