Source Driver Parallel ESD Resistors Charge Sharing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional source drivers face inefficiencies in both driving ability and electrostatic discharge (ESD) protection, as high resistance in ESD protection resistors hampers charge sharing efficiency and driving ability, while reducing resistance compromises ESD protection.
Innovation Solution
The source driver incorporates parallel ESD protection resistors and charge-sharing switches, allowing for reduced resistance during output timing modes to enhance driving ability and charge sharing efficiency while maintaining equivalent ESD protection by using resistors with resistance R, and additional parallel output stages and charge-sharing switches to optimize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the resistance of ESD protection resistors is reduced to improve driving ability and charge sharing efficiency, then the ESD protection capability deteriorates
Solution Approach 1:
The ESD protection function is segmented from the output driving path by placing ESD protection resistors in parallel with the output switches rather than in series. This segmentation allows the output switches to have low resistance for high-speed driving while the ESD resistors provide protection, resolving the contradiction between driving ability and ESD protection capability.
Solution Approach 2:
The ESD protection resistors act as intermediary protective elements that are selectively activated during ESD events. During normal operation, the output switches dominate the low-resistance path for high-speed signal transmission, while the ESD resistors remain dormant until needed for protection, thus mediating between performance and protection requirements.
2Productivity
If the resistance of ESD protection resistors is reduced to improve charge sharing efficiency, then the time to reach intermediate voltage increases, reducing charge sharing efficiency
Solution Approach 1:
The charge sharing path is segmented from the ESD protection path, allowing the output switches to control the charge sharing speed through their low on-resistance. The ESD resistors are segregated to only handle protection functions, enabling fast charge sharing without being limited by high ESD resistance values.
Solution Approach 2:
The circuit dynamically switches between different resistance states through the control signals. During charge sharing mode, the output switches are turned on to provide a low-resistance path for rapid voltage equalization. The ESD resistors remain inactive during normal operation, effectively removing their resistance from the signal path and enabling high-speed charge sharing.
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 configuration improves driving ability and charge sharing efficiency by reducing resistance between output buffers and the display panel, shortening potential reach times, while maintaining equivalent ESD protection, thus enhancing overall source driver performance.
Implementation Method 1
the first resistor R1 and the second resistor R2 are electrostatic discharge (ESD) protection resistors
Implementation Method 2
the first output buffer 12 is used for enhancing a first pixel signal and outputting a first enhanced pixel signal, and the second output buffer 14 is used for enhancing a second pixel signal and outputting a second enhanced pixel signal
Implementation Method 3
the first output switch 16 and the second output switch 18 are simultaneously controlled by a first control signal
Implementation Method 4
the charge-sharing switch 20 is controlled by a second control signal. The first resistor R1 and the second resistor R2 are electrostatic discharge (ESD) protection resistors
Data Source
AI summary
A source driver includes a first output buffer, a second output buffer, a first output switch, a second output switch, a third output switch, a fourth output switch, a first resistor, a second resistor, a third resistor, a fourth resistor, a first charge-sharing switch. The first and the second output buffer respectively enhances a first and a second pixel signal and respectively outputs a first and a second enhanced pixel signal to a display panel. The first output switch and the first resistor connected in series and the second output switch and the second resistor connected in series are connected in parallel between the first output buffer and the display panel. The third output switch and the third resistor connected in series and the fourth output switch and the fourth resistor connected in series are connected in parallel between the second output buffer and the display panel.