Display Device Multiplexer Time-Divided Voltage Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices require multiple source driver integrated circuits (ICs) and consume high power, especially when displaying single colors, due to the high switching frequency of multiplexers in RGBW type displays.
Innovation Solution
The display device employs a multiplexer that time-divides data voltage output from source driver ICs, distributing it to data lines in a non-sequential manner, with control signals in antiphase, and extends the data switching cycle to N horizontal periods (where N is between 4 and 8), reducing the number of source driver ICs and power consumption by maintaining data voltage polarity during one frame period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a multiplexer is installed between the source driver IC and the data lines to reduce the number of source driver ICs, then the device complexity is reduced, but the power consumption increases when high switching frequency is generated and single color is displayed
Solution Approach 1:
The patent applies periodic action by implementing a data voltage polarity reverse cycle that repeats every three or more scan periods. The multiplexer switches between first and second scan orders in a periodic manner, where the number of charge and discharge cycles is controlled to be a multiple of three. This periodic switching pattern reduces the switching frequency and consequently the power consumption of the multiplexer while maintaining the functionality of reducing source driver IC count.
Solution Approach 2:
The patent implements dynamics by making the scan order switchable between first and second patterns based on display content requirements. The system dynamically adjusts the scan order and switching frequency of the multiplexer according to whether single color or multi-color display is needed, thereby optimizing power consumption while maintaining device complexity reduction benefits.
2Manufacturing precision
If the number of charge and discharge data signal is maximized to improve display quality, then the image quality is improved, but the power consumption of the multiplexer increases
Solution Approach 1:
The patent applies parameter changes by controlling the number of charge and discharge cycles of the data signal to be a multiple of three (3, 6, 9, etc.) rather than using maximum possible cycles. This specific parameter modification reduces the switching frequency and power consumption while maintaining sufficient image quality through the periodic polarity reversal mechanism that ensures proper data voltage delivery to all pixel rows.
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A display device includes a pixel array having a plurality of pixels arranged in a matrix form based on a crossing structure of data lines and gate lines, a data driver having a plurality of output channels and configured to output a data voltage, a multiplexer configured to distribute the data voltage output from the data driver to the data lines in response to first and second control signals, and a gate driver configured to output a gate pulse synchronized with the data voltage in a non-sequential manner. The first and second control signals are in antiphase, and a switching cycle of the first and second control signals is one horizontal period or two horizontal periods.