OLED Source Driver Odd-Even Channel Alternation
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Solution Overview
Problem
OLED displays face aging issues due to prolonged light-emitting time, leading to increased threshold voltage and reduced luminance, which existing technologies attempt to address by adding additional TFTs and control signals, but this reduces the opening ratio and increases costs.
Innovation Solution
An OLED display system with a source driver that divides output channels into odd-numbered and even-numbered channels, using an odd-even channel selection module to alternate the emission of odd-numbered and even-numbered pixel units, controlled by a strobe enabling signal and an odd-even selection signal, allowing for reduced light-emitting time without altering the pixel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional TFTs and control signals are added to reduce light-emitting time, then OLED aging is slowed, but opening ratio decreases and system cost increases
Solution Approach 1:
The pixel array is segmented into odd-numbered pixel units and even-numbered pixel units, which are driven by different output channels of the source driver. This segmentation allows alternating emission between odd and even pixels, reducing the cumulative light-emitting time for each individual OLED element without requiring additional TFTs within each pixel structure.
Solution Approach 2:
The source driver implements periodic action by alternating the emission of odd-numbered and even-numbered pixel units across different frame periods. During odd frames, odd pixels emit while even pixels are off, and during even frames, even pixels emit while odd pixels are off. This periodic alternation reduces the overall aging stress on each OLED element while maintaining continuous display output.
2Reliability
If additional control signals are added to alternate pixel emission, then OLED aging is reduced, but driver system cost increases
Solution Approach 1:
The source driver is designed with multi-functionality by incorporating an output channel selection module that can dynamically select between odd-numbered output channels and even-numbered output channels based on frame timing. This single source driver unit handles both odd and even pixel driving functions, eliminating the need for separate driver circuits while achieving alternating emission through controlled channel selection.
3Reliability
If light-emitting time is shortened to reduce OLED aging, then display longevity improves, but display quality may be affected
Solution Approach 1:
The display system maintains continuity of useful action by ensuring that while individual pixels (odd or even) are turned off during alternating periods, the overall display continuously presents image information through the complementary emission of the other pixel group. This creates the perception of continuous display output to human eyes while actually reducing cumulative stress on each individual OLED element.
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 approach effectively shortens the light-emitting time for each pixel, delaying OLED display aging while maintaining normal display performance and avoiding the cost and structural drawbacks of previous solutions.
Implementation Method 1
The electrons and holes combination generates the excited electron-hole pair, and transform the excited electron-hole pair from the excited state to the basic state to emit light
Data Source
AI summary
The invention provides an OLED display and a source driver. The output channels of source driver are divided into odd-numbered (ODD) and even-numbered (EVEN) output channels. With the odd-even channel selection module (33) in source driver to control the logic circuit and driver module (31) to select only odd-numbered (ODD), only even-numbered (EVEN) output channels or both for output based on strobe enabling signal (EN) and odd-even selection signal (SEL). Moreover, through rapid switching between high and low of the odd-even selection signal (SEL), the switching of outputting to only odd-numbered (ODD) and only even-numbered (EVEN) output channels is achieved so that odd-numbered pixel units and even-numbered pixel units in OLED display emit light alternatingly. Without changing pixel structure and reducing opening ration, while ensuring normal display, the invention shortens the light-emitting time of OLED inside each pixel to delay OLED display ageing.