Staggered LED Driving Units Reduce Color Shift in AM Displays
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Solution Overview
Problem
Active matrix light-emitting diode displays experience color shift due to current regulation, affecting picture quality and luminous efficacy.
Innovation Solution
The electronic device employs a data line and two electronic units, each with a light-emitting diode and a driving unit, where the driving units receive data voltages in different time periods within frame periods, allowing for staggered current flow to reduce simultaneous current loading and increase luminous efficacy by adjusting the duration and timing of driving periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the LED is driven by regulating current to achieve different brightness levels, then the brightness control is improved, but color shift occurs affecting picture quality
Solution Approach 1:
The patent applies periodic action by dividing the frame period into multiple driving periods and time periods, where LEDs are driven in alternating sequences rather than continuously. This periodic modulation allows different colored LEDs to be driven at different times, reducing color shift while maintaining brightness control.
Solution Approach 2:
The patent segments the frame period into multiple driving periods and time periods, and divides different colored LEDs into separate groups that are driven alternately. This segmentation allows independent control of different colored LEDs, preventing color shift caused by simultaneous current regulation.
2Illumination intensity
If multiple LEDs of different colors are driven simultaneously with current regulation, then brightness control is achieved, but luminous efficacy decreases due to simultaneous current loading
Solution Approach 1:
The patent uses periodic action by alternating driving periods for different colored LEDs within a frame period. This temporal separation reduces simultaneous current loading on the power supply, improving luminous efficacy while maintaining brightness control through duty cycle adjustment.
Solution Approach 2:
The patent implements dynamic control by adjusting the duration and timing of driving periods for different colored LEDs. This dynamic timing adjustment optimizes current distribution and reduces peak current loading, thereby improving overall luminous efficacy.
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 minimizes color shift and enhances picture quality while increasing luminous efficacy by managing current flow effectively, reducing power loss and improving brightness consistency across LEDs of different colors.
Implementation Method 1
an active matrix light-emitting diode display can drive the light-emitting diode (LED) by regulating the current, so that the LED emits light with different brightness
Data Source
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AI summary
An electronic device (20) includes a first electronic unit (200(1,1)) and a second electronic unit (200(2,1)). The first electronic unit (200(1,1)) includes a first light emitting diode (LED) (210) and a first driving unit (220). The second electronic unit (200(2,1)) includes a second LED (210) and a second driving unit (220). The first driving unit (220) receives a first data voltage to drive the first LED (210) accordingly in a driving period (TSA) in a first frame period (TF1). The second driving unit (220) receives a second data voltage to drive the second LED accordingly in a driving period (TSB) in a second frame period (TF2). A starting time of the first driving unit (220) receiving the first data voltage is different from a starting time of the second driving unit (220) receiving the second data voltage. The driving period (TSA) and the driving period (TSB) starts simultaneously.