OLED Pixel Driving Circuit for Selective Blank-Period Refresh
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Solution Overview
Problem
Existing OLED displays with LTPO technology waste power due to repeated flashing of pixels that do not need voltage updates, leading to unnecessary data line power consumption.
Innovation Solution
A driving circuit with a first switching circuit and scanning signal generation circuit that controls scanning signals during blank time periods between frames to selectively refresh pixels, reducing power consumption by minimizing unnecessary pixel updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all pixel voltages are updated in every frame, then display refresh is ensured, but data line power consumption increases due to unnecessary repeated flashing of pixels that do not need updates
Solution Approach 1:
The patent segments the display refresh process by dividing pixels into two groups: static pixels that maintain their voltage and dynamic pixels that are updated. This is achieved through separate scanning signal paths - one for enabling pixel holding during blank time periods and another for updating pixels that require changes, thereby reducing unnecessary data line activity
Solution Approach 2:
The patent applies preliminary action by pre-charging or pre-discharging data lines before actual pixel updates during the blank time period. This prepares the data lines in advance so that when updates are needed, they can occur more efficiently with reduced power consumption, and pixels that don't need updates simply hold their state
2Reliability
If LTPO technology is used to reduce current leakage, then pixel holding capability is improved, but power consumption is still wasted due to repeated data line switching
Solution Approach 1:
The patent implements periodic action by utilizing the blank time period between display frames to selectively update only those pixels that require changes. During the active display period, pixels maintain their state using LTPO's low leakage characteristics, and during the blank period, selective updates occur without requiring full-screen data line activation, creating an efficient periodic refresh cycle
Data Source
AI summary
A driving circuit, a driving method, a pixel circuit, a display panel and a display device are provided. The driving circuit includes a first switching circuit and a scanning signal generation circuit; the first switching circuit is electrically connected to a first gating control line, at least two data output terminals of a source driver and the scanning signal generation circuit, and is configured to write a data signal provided by the at least two data output terminals into the scanning signal generation circuit under the control of a first gating control signal provided by the first gating control line; the scanning signal generation circuit is configured to generate a scanning signal according to the data signal, and output the scanning signal through the scanning signal output terminal.