Display Device Gate Driver Noise Cancellation
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Solution Overview
Problem
Display devices with non-rectangular shapes face noise superimposition issues due to parasitic capacitance affecting data signals, leading to luminance unevenness in image display.
Innovation Solution
The implementation of a display device with separate signal lines and gate lines, where the driving unit controls the potential of gate lines using gate drivers, and the lines cross each other at positions different from nodes, allowing the potential of one line to be switched opposite to the other, thereby canceling noise caused by parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple lines cross signal lines at nodes for gate driver operation, then the gate drivers can be properly controlled, but noise is superimposed on the data signal due to parasitic capacitance at the nodes
Solution Approach 1:
The patent introduces dummy lines that cross the data signal line at positions different from the node, creating parasitic capacitances with opposite polarity to the node parasitic capacitance. These additional parasitic capacitances cancel out the harmful noise effect of the original node parasitic capacitance, converting the harmful parasitic capacitance into a beneficial noise-cancellation mechanism.
Solution Approach 2:
The dummy lines are deliberately positioned and configured to generate parasitic capacitances that produce noise signals opposite in polarity to the noise from the node. This preliminary anti-action occurs continuously during operation, preemptively canceling the harmful noise before it can degrade the data signal quality.
2Device complexity
If lines cross the signal line at the same node, then the structure is simpler, but the parasitic capacitance causes luminance unevenness in image display
Solution Approach 1:
The patent converts the harmful luminance unevenness caused by node parasitic capacitance into a benefit by introducing dummy lines that create compensating parasitic capacitances. These additional capacitances generate noise signals that cancel the harmful effects, thereby equalizing the luminance across the display.
3Extent of automation
If the number of lines crossing the signal line is increased, then more gate drivers can be controlled, but the noise superimposition on the signal increases
Solution Approach 1:
For each additional dummy line introduced to expand gate driver coverage, a corresponding parasitic capacitance is created that generates noise opposite in polarity to the harmful noise. This transforms the potentially harmful effect of increased line crossings into a beneficial noise-cancellation system.
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 configuration significantly reduces noise superimposition on the signal, ensuring more accurate and even image display by equalizing the number and effect of parasitic capacitances between different lines, thereby minimizing luminance inconsistencies.
Implementation Method 1
A parasitic capacitance is provided at each of the nodes. The parasitic capacitance affects a data signal. Specifically, the planar display device is likely to cause noise superimposition on a data signal.
Data Source
AI summary
Provided is a display device causing less noise on a signal. A display device (10) includes a plurality of signal lines (SL), a plurality of gate lines (GL), and a driving unit. The plurality of gate lines crosses the plurality of signal lines. The driving unit is connected to the plurality of gate lines and controls a potential of each of the gate lines. The driving unit includes a plurality of gate drivers (11) and a plurality of lines. The gate drivers are disposed in a display region, and at least one of the gate drivers is connected to each of the gate lines. The lines are each provided with a potential for operation of one of the gate drivers. Each of the lines crosses one of the signal lines. The plurality of lines includes a first line (17A) and a second line (17B). The driving unit switches a potential of the first line at predetermined timing. The driving unit switches a potential of the second line into a direction opposite to a direction of the switched potential of the first line upon switching the potential of the first line.