Gate Driving Circuit with Selective Gating for OLED AOD Updates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OLED displays, especially for Always On Display (AOD) images, most pixel circuits do not need to update pixel voltage, leading to unnecessary power consumption due to repeated flashing.
Innovation Solution
A driving circuit with a gating circuit that controls the writing of gating input signals to specific pixel circuits, allowing partial screen updates to reduce power consumption by maintaining brightness in non-updated circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If all pixel circuits are updated with pixel voltages in every frame, then the display can show dynamic images, but power consumption increases unnecessarily for static images like AOD
Solution Approach 1:
The display screen is divided into multiple pixel circuits that can be independently controlled. The gating circuit selectively activates only those pixel circuits that need updating, while leaving others in a maintained state. This segmentation allows partial screen updates for AOD images, reducing power consumption by avoiding unnecessary voltage writes to pixel circuits that don't need to change their display state.
Solution Approach 2:
Instead of updating all pixel circuits in every frame, the invention implements partial action by updating only the necessary subset of pixel circuits. The gating control signal selectively enables writing operations for specific pixel circuits based on whether their display content has changed, avoiding excessive power consumption from redundant updates while maintaining full display functionality when needed.
2Illumination intensity
If pixel circuits are updated frequently, then the display can maintain image quality, but power consumption increases due to repeated flashing
Solution Approach 1:
The invention implements periodic action by updating pixel circuits only when necessary rather than continuously. The gating control signal creates a periodic update pattern where pixel circuits are refreshed at intervals based on actual content changes, rather than following a fixed high-frequency refresh cycle. This maintains display brightness quality while significantly reducing power consumption during AOD mode with static images.
Solution Approach 2:
The pixel circuits with low leakage current inherently maintain their voltage and display state without continuous external intervention. The gating circuit exploits this self-service capability by allowing pixel circuits to maintain their brightness state autonomously between updates, rather than requiring active refreshing. This reduces power consumption while maintaining display quality for static content.
3Use of energy by moving object
If a gating circuit is introduced to selectively update pixel circuits, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The gating circuit is designed with multi-functionality to minimize added complexity. The same gating control mechanism serves multiple purposes: it enables selective pixel circuit updates, controls the timing of voltage writes, and works with existing low-leakage TFT technology. By making the gating circuit universal rather than specialized, the invention reduces power consumption without proportionally increasing device complexity.
Solution Approach 2:
The gating control signal acts as an intermediary between the display controller and the pixel circuits. Rather than requiring complex direct control of each pixel circuit, the gating signal mediates the update process by selectively enabling or disabling writing operations. This intermediary approach simplifies the overall control architecture while achieving selective updates, balancing power reduction with acceptable device complexity.
Data Source
AI summary
A driving circuit includes a driving signal generation circuit, a gating circuit, an output control circuit, an output circuit and a voltage control circuit; the driving signal generation circuit generates an Nth stage of driving signal, the output control circuit connects the first control node and the second node under the control of the potential of the first node; the gating circuit controls to write a gating input signal into the first node under the control of a gating control signal; the voltage control circuit controls a potential of the second node according to a potential of the first node; the output circuit connects the output driving terminal and the first voltage terminal under the control of the potential of the second node, and connects the output driving terminal and the second voltage terminal under the control of the potential of the third control node.