DAC Reference Voltage Line Widths for Faster Grayscale Transitions
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Solution Overview
Problem
Conventional driving circuits face inconsistency in transition speeds of output voltages due to uniform wire diameters/wire widths of reference voltage lines, leading to significant RC delays, especially for large voltage transitions.
Innovation Solution
The driving circuit employs reference voltage lines with varying wire diameters/wire widths based on different ranges of grayscale reference voltages, with larger diameters/wire widths for higher voltage groups to reduce impedance and RC delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If uniform minimum wire diameter/wire width is used for all reference voltage lines, then layout area is optimized, but transition speed inconsistency occurs among output voltages
Solution Approach 1:
The patent applies local quality by assigning different wire diameters/wire widths to different reference voltage lines based on their specific voltage levels. High voltage group lines (VGL1-VGLm) use a first wire diameter/wire width, while low voltage group lines (VGLm+1-VGLn) use a second wire diameter/wire width. This localized differentiation optimizes transition speeds for each voltage group without unnecessarily increasing the area of all lines, thus resolving the contradiction between layout area optimization and transition speed consistency.
2Ease of manufacture
If minimum wire diameter/wire width is used for all reference voltage lines, then manufacturing simplicity is maintained, but RC delays increase significantly
Solution Approach 1:
The patent changes the physical parameter of wire diameter/wire width based on voltage group classification. By increasing the wire diameter/wire width for high voltage group reference voltage lines, the resistance and RC delays are reduced for these critical lines. This parameter change is applied selectively rather than uniformly, maintaining manufacturing simplicity while significantly reducing RC delays where they matter most.
3Loss of time
If wire diameter/wire width is increased for high voltage groups, then RC delays are reduced, but layout area increases
Solution Approach 1:
The patent applies local quality by assigning different wire diameters/wire widths to different reference voltage lines based on their specific voltage levels. High voltage group lines (VGL1-VGLm) use a first wire diameter/wire width, while low voltage group lines (VGLm+1-VGLn) use a second wire diameter/wire width. This localized differentiation optimizes transition speeds for each voltage group without unnecessarily increasing the area of all lines, thus resolving the contradiction between layout area optimization and transition speed consistency.
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 design effectively reduces the inconsistency of transitions in output voltages by optimizing wire widths according to voltage ranges, minimizing RC delays and improving transient response.
Implementation Method 1
inconsistency of transition speeds of output voltages due to uniform wire diameters/wire widths of reference voltage lines, leading to significant RC delays
Implementation Method 2
with larger diameters/wire widths for higher voltage groups to reduce impedance and RC delays
Data Source
AI summary
A driving circuit includes a plurality of reference voltage lines and a digital to analog converter. The reference voltage lines are configured for respectively transmitting different grayscale reference voltages, in which the grayscale reference voltages are divided into at least two groups, and the wire diameter/wire width of at least one reference voltage line among the reference voltage lines of a first voltage group among the at least two groups is different from the wire diameters/wire widths of the reference voltage lines of a second voltage group among the at least two groups. The digital to analog converter is coupled to the reference voltage lines to receive the grayscale reference voltages and is for converting a digital signal into a grayscale voltage according to the grayscale reference voltages.