Screen Drive Circuit for Selective Pixel-Row Refresh in OLED Displays
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Solution Overview
Problem
Current OLED display technologies face high power consumption and long delays due to global refreshing of the entire screen, which is inefficient and cannot accommodate varying refresh rates across different display regions or split-screen scenarios.
Innovation Solution
A screen drive circuit with an array drive circuit and a drive selection circuit that selectively refreshes only the pixel rows that need updating, based on content changes, using a row address selection signal to mask or output row drive signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If global refreshing is used to update the entire screen, then all displayed content can be updated uniformly, but power consumption increases and refresh delay increases
Solution Approach 1:
The patent divides the display screen into multiple pixel rows and selectively refreshes only the rows whose displayed content needs updating, rather than refreshing the entire screen. This segmentation approach reduces power consumption while maintaining content update completeness for affected regions.
Solution Approach 2:
The patent implements different refresh strategies for different regions of the display. Pixel rows with content changes are refreshed at higher rates while other rows maintain their current state, creating local quality variations in refresh behavior to optimize power consumption.
2Reliability
If global refreshing is used to update the entire screen, then all displayed content can be updated uniformly, but refresh delay increases
Solution Approach 1:
By segmenting the refresh operation into individual pixel row updates based on content change detection, the system can immediately update only the affected rows without waiting for a complete global refresh cycle, thereby reducing refresh delay.
Solution Approach 2:
The patent dynamically adjusts the refresh strategy based on actual content changes. When content changes are detected in specific pixel rows, the system dynamically initiates selective refresh for those rows only, reducing the time required compared to static global refreshing.
3Use of energy by moving object
If selective row refreshing is implemented, then power consumption and delay are reduced, but device complexity increases
Solution Approach 1:
The drive selection circuit is designed to perform multiple functions: it receives row drive signals, detects content changes, determines which pixel rows need refreshing, and selectively outputs drive signals to the appropriate rows. This multi-functionality reduces the need for separate dedicated circuits for each function.
Solution Approach 2:
The drive selection circuit acts as an intermediary between the row drive circuit and the pixel arrays. It receives drive signals from the row drive circuit, processes them based on content change information, and selectively forwards them to the appropriate pixel rows, simplifying the overall system architecture.
4Use of energy by moving object
If selective row refreshing is implemented, then power consumption and delay are reduced, but control complexity increases
Solution Approach 1:
The system uses content change detection as feedback to control the refresh process. The drive selection circuit receives information about which pixel rows have content changes and uses this feedback to selectively activate row drive signals, simplifying control through information-driven decision making.
Solution Approach 2:
The system performs preliminary content change detection before initiating the refresh process. By identifying which pixel rows need updating in advance, the system can prepare and execute selective refresh operations more efficiently, reducing control complexity through advance planning.
Data Source
AI summary
This application provides a screen drive circuit, a display, and an electronic device. An input terminal of a drive selection circuit in the screen drive circuit inputs a row drive signal, and a control terminal of the drive selection circuit inputs a row address selection signal. The drive selection circuit outputs, based on the row address selection signal, the row drive signal corresponding to a pixel row whose displayed content changes. The row address selection signal is generated, by a display drive chip connected to the display, based on the pixel row whose displayed content changes. It can be learned that, the screen drive circuit can separately select, based on an update frequency of displayed content on the display, some pixel rows in a pixel array for content refreshing, thereby implementing local refreshing based on the displayed content.