Display Driver Voltage Correction for Color Accuracy
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Solution Overview
Problem
In display drivers for liquid crystal display panels, the fluctuation of common voltage at common terminals introduces noise, leading to errors in electric charge storage and gradation levels, which can result in display color errors, and existing solutions to mitigate this often increase power consumption and chip size.
Innovation Solution
A driving device with a drive voltage-producing circuit that detects changes in common voltage and adjusts drive voltages accordingly, using non-inverting and inverting amplifiers to correct voltage errors between common and data terminals, without increasing power consumption or chip size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing solutions are used to mitigate common voltage fluctuation, then display color errors are reduced, but power consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where the drive voltage-producing circuit detects changes in common voltage and automatically adjusts drive voltages in response. This closed-loop control corrects voltage errors without requiring additional power-consuming compensation circuits, thereby maintaining display color accuracy while avoiding increased power consumption.
Solution Approach 2:
The drive voltage-producing circuit performs self-correction by detecting common voltage fluctuations and autonomously adjusting its output drive voltages. This self-service mechanism eliminates the need for separate power-consuming compensation circuits, resolving the contradiction between maintaining display accuracy and controlling power consumption.
2Reliability
If existing solutions are used to mitigate common voltage fluctuation, then display color errors are reduced, but chip size increases
Solution Approach 1:
The patent merges the common voltage detection function and drive voltage adjustment function into the existing drive voltage-producing circuit. By integrating these functions rather than adding separate compensation circuits, the patent reduces chip size while maintaining the ability to correct display color errors caused by common voltage fluctuations.
Solution Approach 2:
The drive voltage-producing circuit is designed to perform multiple functions: generating drive voltages, detecting common voltage changes, and adjusting drive voltages for correction. This multi-functionality eliminates the need for dedicated compensation circuits, thereby reducing chip size while maintaining display color accuracy.
3Use of energy by moving object
If common voltage fluctuation is not corrected, then power consumption and chip size remain low, but noise and display color errors occur
Solution Approach 1:
The patent implements a feedback mechanism where the drive voltage-producing circuit continuously monitors common voltage and automatically adjusts drive voltages to compensate for fluctuations. This real-time correction eliminates display color errors and noise without requiring additional power-consuming circuits, as the adjustment is performed within the existing circuit architecture.
Solution Approach 2:
The patent dynamically changes drive voltage parameters in response to detected common voltage fluctuations. By adjusting the drive voltage levels adaptively rather than using fixed compensation circuits, the patent corrects display color errors while maintaining low power consumption and small chip 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 effectively mitigates the influence of common voltage fluctuations on display elements, ensuring accurate electric charge storage and gradation levels without increasing power consumption or chip size, thus preventing display color errors.
Implementation Method 1
a drive voltage-producing circuit configured to produce a plurality of drive voltages and change the drive voltages in a direction of a change in a common voltage
Data Source
AI summary
The driving device used for drive control of a driven device having driven elements arranged to commonly receive a common voltage at common terminals and individually receive drive signals at data terminals has: a drive voltage-producing circuit which produces drive voltages; a driver circuit which accepts input of the drive voltages produced by the drive voltage-producing circuit and outputs, as drive signals, signals selected from the drive voltages according to drive data from data output terminals in parallel; and a common voltage-producing circuit which produces a common voltage to output from a common-voltage-output terminal. In the driving device, the drive voltage-producing circuit detects a change in the common voltage output from the common-voltage-output terminal, and changes the drive voltages in the direction of the change.