Display Driver Frame Rate Control for Gamma Deviation Correction
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Solution Overview
Problem
Liquid crystal panels face deviations in gamma values across different gradations, leading to issues like tone jump, color shift, and color cast due to unique gamma characteristics in each panel, which existing technologies fail to address effectively.
Innovation Solution
A display driver with a drive circuit and control circuit that utilizes frame rate control to generate and supply drive voltages based on voltage division of reference voltages, effectively correcting gamma value deviations and improving color reproducibility and gradation representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If grayscale voltages are generated by voltage division using fixed resistors, then circuit size can be reduced, but gamma value deviation occurs between different gradations
Solution Approach 1:
The patent applies frame rate control to dynamically adjust the display of grayscale voltages. By controlling the frame rate at which different grayscale levels are displayed, the system compensates for gamma value deviations without requiring complex circuitry. This dynamic temporal adjustment allows the fixed resistor voltage division circuit to achieve better gamma consistency across gradations.
Solution Approach 2:
The patent changes the temporal parameter (frame rate) of grayscale voltage display to compensate for gamma deviations. By varying the display duration and timing of different grayscale levels, the system corrects the non-linear luminance response without modifying the physical circuit structure or resistor values.
2Device complexity
If conventional voltage division methods are used, then circuit complexity is reduced, but tone jump and color shift occur in low and high gradation regions
Solution Approach 1:
The patent employs periodic frame rate control to display grayscale voltages. By using periodic display cycles with varying frame rates for different grayscale levels, the system ensures smooth transitions and prevents tone jump and color shift artifacts in low and high gradation regions while keeping the circuit simple.
Solution Approach 2:
The frame rate control mechanism acts as a feedback system that adjusts the display timing based on the gamma characteristics of the liquid crystal panel. This feedback loop compensates for color reproducibility issues without adding complex circuitry, maintaining simplicity while improving reliability.
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 suppresses gamma value deviations between gradations, enhancing color reproducibility and gradation representation, particularly in low and high gradation regions, by using frame rate control to adjust grayscale voltages and improve the display panel's ability to represent smooth changes in hue.
Implementation Method 1
outputs a drive voltage that is based on a grayscale voltage obtained by voltage division of an ith reference voltage and an (i+1)th reference voltage
Implementation Method 2
The colors of the R, G and B subpixels are determined by the luminance of light that passes through color filters respectively provided on the subpixels. The luminance of light that passes through each color filter is decided by the voltage that is supplied to a source electrode (data line) of the liquid crystal panel.
Implementation Method 3
a control circuit that utilizes frame rate control on first display data corresponding to a grayscale voltage obtained by voltage division of the first reference voltage and a second reference voltage to generate second display data
Data Source
AI summary
A display driver includes a drive circuit that receives input of a first reference voltage to an nth reference voltage (where n is an integer of two or more), and outputs a drive voltage that is based on a grayscale voltage obtained by voltage division of an ith reference voltage and an (i+1)th reference voltage (where i is an integer of n−1 or less), and a control circuit that utilizes frame rate control on first display data corresponding to a grayscale voltage obtained by voltage division of the first reference voltage and a second reference voltage to generate second display data, and supplies the second display data to the drive circuit.