Display Device Black Data Voltage Control for Crosstalk Reduction
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Solution Overview
Problem
Display devices experience horizontal crosstalk due to variations in data voltage supplied to one data line affecting another, leading to image quality issues.
Innovation Solution
A display device configuration that includes a data drive unit outputting a black data voltage greater than the minimum output value and a gamma voltage supply unit generating gamma voltages for each gradation level, reducing horizontal crosstalk by controlling the driving of the display panel through a timing controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the black data voltage is set to the minimum output value, then power consumption is reduced, but horizontal crosstalk increases due to voltage variation transfer through gate lines
Solution Approach 1:
The patent changes the parameter of black data voltage from the minimum output value to a higher voltage level (third voltage). This parameter change reduces the voltage variation amplitude when transitioning between black and other gradation levels, thereby minimizing the transfer of voltage variations through gate lines and reducing horizontal crosstalk, while still maintaining optimized power consumption.
2Object-affected harmful factors
If data voltage variation is minimized for better image quality, then horizontal crosstalk is reduced, but contrast ratio may deteriorate
Solution Approach 1:
The patent optimizes the black data voltage parameter to a specific third voltage level that balances two competing requirements: it reduces voltage variation amplitude to minimize horizontal crosstalk, while simultaneously maintaining sufficient voltage difference between black and white levels to preserve contrast ratio. This optimal parameter setting achieves both goals simultaneously.
Data Source
AI summary
A display device includes: a display panel in which a plurality of data lines and a plurality of gate lines intersect in a matrix form and pixels are formed at intersecting points thereof; a data drive unit connected to the plurality of data lines and configured to output a black data voltage corresponding to a gradation level of 0 and expressing the black data voltage as a third voltage through the data lines, the third voltage greater than a first voltage, which is a minimum output value, and less than or equal to a second voltage corresponding to a gradation level of 0 when linearly extending data voltages of two or more low gradation levels; a gamma voltage supply unit outputting a gamma voltage for each gradation level to the data drive unit; and a timing controller generating a control signal to control driving of the display panel.