Amplifier Response-Speed Circuit for Display Driver Voltage Stability
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Solution Overview
Problem
High-speed processing in display drivers is hindered by voltage fluctuations in gradation voltages due to changes in current load, leading to image degradation, increased power consumption, heat generation, and larger chip sizes.
Innovation Solution
Incorporating response-speed increase circuits with transistors connected to the output terminals of amplifiers in the gradation voltage generation unit, which apply a predetermined electric potential to the drain and reference voltage to the gate, reducing voltage fluctuations and enhancing the speed of gradation voltage output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operating current in the gamma buffer is increased to quickly suppress voltage fluctuation, then the response speed is improved, but power consumption and heat generation increase
Solution Approach 1:
The invention divides the current path into two separate paths: a first current path for normal operation and a second current path for rapid response. The first current path includes the gamma buffer operating at low current for normal conditions, while the second current path includes a switchable current source that provides high current only when voltage fluctuation correction is needed. This segmentation allows the system to achieve fast response speed when needed without continuously consuming high power.
2Speed
If the operating current in the gamma buffer is increased to quickly suppress voltage fluctuation, then the response speed is improved, but heat generation increases
Solution Approach 1:
The invention segments the current supply system into a normal operation current path and a rapid response current path. The rapid response path uses a switchable current source that is activated only when voltage fluctuation correction is needed, providing high current temporarily to suppress voltage fluctuation quickly. After correction, the high current is turned off, preventing continuous heat generation while maintaining the capability for fast response when needed.
3Use of energy by moving object
If the gate width of transistors is increased to compensate for reduced operation margin, then the power consumption is improved, but chip size increases
Solution Approach 1:
The invention makes the current supply dynamic by introducing a switchable current source that can be activated or deactivated based on operational needs. Instead of using a continuously high current (which would require large transistors and increase chip size), the system dynamically switches between low current normal operation and high current rapid response modes. This dynamic approach allows the use of smaller transistors while maintaining both low power consumption and fast response capability when needed.
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 solution suppresses voltage fluctuations, allowing for faster response times in display drivers while reducing power consumption, heat generation, and device size, thereby maintaining image quality without increasing internal currents.
Implementation Method 1
The response-speed increase circuit includes at least one transistor in which a source and a back gate are connected to an output terminal of the amplifier, a predetermined electric potential is applied to a drain, and the reference voltage input to the amplifier is applied to a gate
Data Source
AI summary
A voltage generation unit includes first to k-th amplifiers that individually receiving first to k-th reference voltages having mutually different voltage values, individually amplify these reference voltages with gain 1, and output the reference voltages. The generation unit generates plural gradation voltages by dividing voltages between respective voltages output from the first to k-th amplifiers. A decoder unit selects one gradation voltage corresponding to the luminance level represented by the pixel data piece among the gradation voltages and generates a signal having the one gradation voltage as the drive signal for driving a display device. Each amplifier includes a response-speed increase circuit that includes at least one transistor in which a source and a back gate are connected to an output terminal of the amplifier, a predetermined electric potential is applied to a drain, and the reference voltage received by the amplifier is received at a gate.