Gamma Voltage Buffer Layout for Fast Display Response
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Solution Overview
Problem
Display apparatuses with high resolution and high frequency face challenges in achieving fast output response times for gamma voltages due to limitations in reducing internal load resistance levels, leading to potential overcurrent issues and increased circuit size when using large-capacity gamma buffers.
Innovation Solution
A gamma voltage generating circuit with distributed connections of resistor strings to multiple gamma buffers, reducing load resistance levels without increasing circuit size, by distributing current flow across multiple output terminals to prevent overcurrent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the internal load resistance level of the gamma voltage generating circuit is decreased to improve output response time, then the response time is improved, but a specific gamma buffer is abnormally driven due to overcurrent
Solution Approach 1:
The patent divides the current load distribution by connecting multiple gamma buffers in parallel to the resistor strings. Each resistor string connects to multiple gamma buffers through separate connection portions, segmenting the current path so that current is distributed across multiple buffers rather than concentrating on a single buffer, thereby preventing overcurrent and abnormal operation while maintaining fast response time
2Power
If a large-capacity gamma buffer is used to improve driving capability and response time, then the driving capability is improved, but the circuit size increases
Solution Approach 1:
The patent merges multiple gamma buffers into a parallel configuration where multiple buffers share common connection points to the resistor strings. This combining approach allows the circuit to achieve enhanced driving capability through collective buffer strength while avoiding the need for a single large-capacity buffer, thus maintaining compact circuit size
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
The solution achieves a fast response time with reduced output settling time, preventing abnormal operations and maintaining a compact circuit size, suitable for high-resolution and high-frequency applications.
Implementation Method 1
a plurality of resistor strings connected between two tap nodes of the plurality of tap nodes, and a plurality of gamma buffers configured to generate a plurality of tap gamma voltages to output to the plurality of tap nodes, based on voltage division results of the plurality of resistor strings
Data Source
AI summary
A gamma voltage generating circuit includes a plurality of tap nodes, a plurality of resistor strings connected between two tap nodes of the plurality of tap nodes, and a plurality of gamma buffers configured to generate a plurality of tap gamma voltages to output to the plurality of tap nodes, based on voltage division results of the plurality of resistor strings, wherein each of the plurality of resistor strings includes a first connection portion coupled to a tap gamma output of a first gray level and a second connection portion coupled to a tap gamma output of a second gray level which is lower than the first gray level, and the second connection portions of the plurality of resistor strings are distributed and connected to output terminals of two or more gamma buffers.