Dual-Row Scanning Drive Circuit for OLED Display Power Reduction
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Solution Overview
Problem
High-definition display devices using organic EL technology face increased power consumption due to higher driving frequencies required for more scanning lines, limiting further advancements in resolution.
Innovation Solution
A display device configuration with sub-pixels arranged in a matrix, where two image signal lines and one scanning signal line are used per column and row, respectively, with a drive circuit applying conduction potential to two adjacent rows simultaneously to reduce power consumption and scanning frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of scanning lines is increased to achieve higher definition, then the display resolution is improved, but the power consumption increases due to higher driving frequency requirements
Solution Approach 1:
The patent merges the scanning of two adjacent rows into a single driving cycle by applying a conduction potential to two scanning signal lines simultaneously. This combines what would traditionally be two separate scanning operations into one, effectively halving the required driving frequency and reducing power consumption while maintaining the ability to drive all necessary pixels for high definition display.
2Speed
If the driving frequency is increased to accommodate more scanning lines, then the scanning speed is improved, but the power consumption increases
Solution Approach 1:
The patent merges adjacent row scanning operations by applying conduction potential to two scanning signal lines at the same time. This merging approach maintains scanning speed efficiency by processing two rows in parallel within a single driving cycle, eliminating the need to increase frequency while still accommodating more scanning lines for higher definition.
3Use of energy by moving object
If adjacent scanning lines are selected and written with opposite polarities, then the power consumption is reduced, but the image quality may be affected by flicker
Solution Approach 1:
The patent dynamically adjusts the combination of scanning signal lines that receive conduction potential from frame to frame. By changing which adjacent rows are paired together, the system prevents persistent flicker patterns while maintaining the power-saving benefits of simultaneous dual-row scanning. This dynamic reconfiguration ensures that no fixed pattern of opposite polarity writing causes visible flicker.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces power consumption and allows for higher definition displays without increasing power usage, while also enhancing display quality by suppressing flicker and enabling smoother moving images through complementary image processing.
Implementation Method 1
light emitting elements that each emit light on the basis of a potential of the other of the source and the drain of the pixel transistor
Data Source
AI summary
A display device includes a display area that includes sub-pixels arranged in a matrix having rows and columns, pixels formed of the combination of two sub-pixels, from which light of different wavelength regions is emitted, image signal lines arranged by two columns, scanning signal lines arranged by one in each row, pixel transistors disposed in the respective sub-pixels in which one image signal line is connected to a source of each pixel transistor, and the one scanning signal line is connected to a gate of the pixel transistor, light emitting elements that each emit light on the basis of a potential of a drain of the pixel transistor, and a drive circuit that applies a conduction potential for rendering the pixel transistors conductive to two scanning signal lines corresponding to two adjacent rows at the same time.