Multiplexed Driver Circuit for Equal RGB Sub-Pixel Charging
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Solution Overview
Problem
Existing display technologies experience color shifts due to insufficient charging time of certain sub-pixels, leading to decreased display quality in flat panel displays like LCDs and OLEDs.
Innovation Solution
A multiplexed type driver circuit is implemented, utilizing N-type field effect transistors and switches to ensure identical data signal input durations for red, green, and blue sub-pixels within a pixel unit, by controlling the ON and OFF states of switches to synchronize charging times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional multiplexed driving is used to reduce circuit complexity, then device complexity is reduced, but charging time of the third sub-pixel becomes insufficient causing color shift
Solution Approach 1:
The third switch is turned on before the first and second switches, allowing the third sub-pixel to start charging earlier. This preliminary action compensates for the sequential charging delay, ensuring all sub-pixels receive data signals for the same duration despite the multiplexed driving sequence.
Solution Approach 2:
The timing parameters of the switches are adjusted differently: the third switch is turned on earlier and kept on longer than the first and second switches. This parameter change equalizes the effective charging time across all sub-pixels, resolving the color shift issue while maintaining multiplexed driving simplicity.
2Ease of operation
If sequential switching is used to control data signal input, then ease of operation is improved, but charging time of later sub-pixels becomes insufficient
Solution Approach 1:
The third switch is activated in advance before the first and second switches, ensuring the third sub-pixel begins receiving the data signal earlier. This preliminary action compensates for the sequential switching delay, maintaining equal charging durations for all sub-pixels while preserving the simplicity of sequential control.
Solution Approach 2:
The switching timing is dynamically adjusted for each switch: the third switch has an earlier turn-on time and later turn-off time compared to the first and second switches. This dynamic timing adjustment ensures all sub-pixels receive data signals for identical durations despite sequential switching operation.
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 solution prevents color shifts by ensuring each sub-pixel receives identical charging times, thereby enhancing the display quality by maintaining consistent luminescence across all sub-pixels.
Implementation Method 1
The first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch may N-type field effect transistors
Data Source
AI summary
The present disclosure provides a multiplexed type driver circuit, a driving method, and a display. The driver circuit may include: a fourth switch couple to a first switch and a first sub-pixel, a fifth switch couple to a second switch and a second sub-pixel, a sixth switch couple to a third switch and a third sub-pixel. The driving method may include: controlling ON and OFF of the first switch to input a data signal to the first sub-pixel; controlling ON and OFF of the second switch to input a data signal to the second sub-pixel; controlling ON of the third switch and OFF of the sixth switch to input a data signal to the third sub-pixel; and turning off the third switch after turning off the sixth switch. The durations of data signal input to the first sub-pixel, the second sub-pixel and the third sub-pixel are identical.