Display Driver IC Dynamic Transistor Mode Switching
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Solution Overview
Problem
High power consumption in display systems, particularly in display driver integrated circuits, increases as the display system operates at higher frequencies, leading to inefficiencies in energy usage.
Innovation Solution
A display driver integrated circuit is designed with a gamma circuit, control circuit, and output buffer circuit that dynamically adjusts transistor operation based on panel brightness and power supply voltages, switching between driving modes to optimize power usage by turning off or on specific transistors in the input stage of buffer circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display system operates at higher frequencies to provide excellent image quality, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic driving mode switching between first and second driving modes based on grayscale values. The control circuit dynamically adjusts the operating state of transistors in buffer circuits according to the displayed image content, enabling the system to adaptively optimize power consumption while maintaining image quality across different brightness levels
Solution Approach 2:
The patent changes the operational parameters of the display driver by switching between different driving modes. In the first driving mode, transistors operate in saturation region for high-speed response, while in the second driving mode, transistors operate in linear region for low power consumption. This parameter switching resolves the contradiction between image quality and power consumption
2Adaptability or versatility
If all transistors in the buffer circuit input stage are turned on, then the circuit can handle full brightness range, but power consumption increases
Solution Approach 1:
The patent applies local quality by selectively controlling different transistors in the buffer circuit input stage. Based on the grayscale value of the displayed pixel, the control circuit determines whether to turn on or off specific transistors (first transistors or second transistors). This localized control allows the circuit to handle the required brightness range while minimizing power consumption by activating only the necessary transistors for each pixel
3Use of energy by moving object
If transistors are turned off to reduce power consumption, then power efficiency improves, but circuit response speed may be affected
Solution Approach 1:
The patent dynamically switches between two driving modes based on real-time grayscale values. When high brightness is required, the first driving mode activates transistors in saturation region for fast response. When low brightness is sufficient, the second driving mode turns off transistors for power savings. This dynamic adaptation resolves the speed-power efficiency contradiction by matching transistor operation to actual display requirements
Data Source
AI summary
A display driver integrated circuit includes a gamma circuit, a control circuit, and an output buffer circuit. The gamma circuit generates a plurality of gamma voltages based on gamma control information, a first gamma power supply voltage and a second gamma power supply voltage. The control circuit calculates a gamma limit value based on panel brightness information, voltage levels of the first and second gamma power supply voltages and the number of the plurality of gamma voltages. The control circuit generates a mode determination signal. The output buffer circuit includes a plurality of buffer circuits. Each of the plurality of buffer circuits includes an input stage and the input stage includes first transistors and second transistors. In a first driving mode, each of the plurality of buffer circuits turns off the first transistors and turns on the second transistors included in the input stage.