Display Multiplexer Reset Scheme for Bipolar Gamma Driving
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Solution Overview
Problem
Traditional multiplexers using single-type transistors, such as NMOS or PMOS, face challenges in maintaining sufficient driving capability for sub-pixels when handling Gamma voltages of different polarities, leading to increased manufacturing complexity and costs due to the need for CMOS transistors, which require more complicated processes and additional masks.
Innovation Solution
The proposed multiplexer design incorporates multiple driving units with specific transistor configurations and reset signal management, ensuring sufficient driving capability for data lines and sub-pixels by applying two different reset signals to increase the voltage difference between the gate and drain of transistors, allowing for either NMOS or PMOS transistors to be used, thereby simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CMOS transistors are used to ensure sufficient driving capability for sub-pixels with different polarity Gamma voltages, then the driving capability is improved, but the manufacturing complexity and cost increase due to more complicated processes and additional masks
Solution Approach 1:
The patent uses transistors of the same type (all NMOS or all PMOS) throughout the multiplexer circuit, eliminating the need for CMOS complementary pairs. This homogeneous transistor approach simplifies the manufacturing process while maintaining sufficient driving capability through proper circuit design and reset signal management.
Solution Approach 2:
The patent introduces different reset signals (first reset signal and second reset signal) to adjust the operating parameters of the transistors. By controlling the reset signals differently, the circuit compensates for the limitations of single-type transistors and ensures sufficient driving capability for both positive and negative polarity Gamma voltages without requiring CMOS transistors.
2Ease of manufacture
If single-type transistors (NMOS or PMOS) are used to simplify the manufacturing process, then the manufacturing complexity is reduced, but the driving capability for sub-pixels with different polarity Gamma voltages becomes insufficient
Solution Approach 1:
The patent divides the multiplexer into multiple driving units, each handling specific data lines and sub-pixels. By segmenting the circuit, each unit can be optimized with single-type transistors while the overall system maintains sufficient driving capability through coordinated control of reset signals and switch signals across different units.
Solution Approach 2:
The patent applies reset signals to the transistors before data transmission to pre-establish the appropriate voltage levels and transistor states. This preliminary action ensures that when Gamma voltages of different polarities are applied, the transistors are already in the optimal state for driving, compensating for the inherent limitations of single-type transistors.
Data Source
AI summary
A multiplexer is provided herein. The multiplexer has a plurality of first driving units and a plurality of second driving units. Each of the first driving units has a first data voltage input terminal, and each of the second driving units has a second data voltage input terminal. The first data voltage input terminal and the second data voltage input terminal are configured to receive pixel voltage signals with different polarities. In the first driving unit, a voltage difference between a gate and a drain of a transistor is controlled by a first reset signal, wherein the transistor of the first driving unit is coupled to the first data voltage input terminal and a first data line. In the second driving unit, a voltage difference between a gate and a drain of a transistor is controlled by a second reset signal, wherein the transistor of the second driving unit is coupled to the second data voltage input terminal and a second data line.