Display MUX Circuit With Data-Line Discharge for Low-Gray Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in reducing the number of data pads and channels, leading to a complex data driver structure and increased failure rates of sub pixels, especially in low gradation images.
Innovation Solution
A display device design that incorporates a MUX circuit with charge and discharge transistors to alternately drive pairs of sub pixels, reducing the number of data pads and channels, and includes a simplified data driver structure, allowing for efficient use of non-active area space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional display device structure is used, then each sub-pixel has its own data line connected to data pads, but the number of data pads and channels increases, leading to complex data driver structure
Solution Approach 1:
The patent merges two data lines (first data line and second data line) into a single data pad through the MUX circuit. The MUX circuit selectively connects either the first data line or the second data line to the data pad based on selection signals, thereby reducing the total number of data pads and channels while maintaining reliable sub-pixel driving.
Solution Approach 2:
The MUX circuit enables a single data pad to serve multiple functions by sequentially selecting different data lines. The data pad can be connected to the first data line during one period and to the second data line during another period, making the data pad a multi-functional interface that reduces overall system complexity.
2Reliability
If data lines are not discharged during non-driving period, then data driver structure is simpler, but voltage accumulation causes abnormal driving failures of sub-pixels
Solution Approach 1:
The discharge transistor is activated during the non-driving period to discharge the data line voltage before the next driving period begins. This preliminary discharge action prevents voltage accumulation that would cause abnormal sub-pixel driving, ensuring reliable operation without requiring complex continuous monitoring mechanisms.
Solution Approach 2:
The MUX circuit includes self-service discharge functionality where the discharge transistor automatically discharges the data line when not in use. This self-service mechanism eliminates the need for external discharge circuits or complex control systems, achieving reliable voltage management with minimal added complexity.
3Ease of operation
If multiple data pads are used for each data line, then data driver can independently control each line, but the number of channels increases and cost increases
Solution Approach 1:
The patent combines control of multiple data lines into fewer channels by using the MUX circuit to share data pads. Instead of having separate data pads for each data line, the MUX circuit enables multiple data lines to share common data pads, reducing the total number of channels while maintaining control flexibility through selective switching.
Solution Approach 2:
The data pad becomes a universal interface that can be dynamically assigned to different data lines based on selection signals. This multi-functionality allows the system to maintain ease of operation for data line control while reducing the total quantity of data pads and channels required.
Data Source
AI summary
A display device is provided. A display device of one embodiment comprises a plurality of sub pixels, a plurality of data lines connected to each of the plurality of sub pixels, and a multiplexer (MUX) circuit connected to a pair of adjacent data lines among the plurality of data lines, the MUX circuit comprising a charge transistor connected to each of the pair of data lines, and a discharge transistor connected to each of the pair of data lines. Accordingly, the MUX circuit comprises the discharge transistor discharging a voltage of the data line, to reduce or minimize a failure of abnormal driving of sub pixels connected to a part of the data lines.