Gate Driving Kickback Compensation for Display Panels
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Solution Overview
Problem
The display quality of image panels is compromised due to a decrease in charge rate of data signals caused by kickback voltage when the gate signal transitions from gate on voltage to gate off voltage.
Innovation Solution
A display apparatus with a kickback compensating part that controls the gate signal by adjusting the gate on voltage, first gate off voltage, and second gate off voltage, using switches and a variable resistor to manage the transition slopes and compensate for kickback voltages, thereby maintaining pixel voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the gate signal decreases rapidly from gate on voltage to gate off voltage, then the switching speed is improved, but the charge rate of the data signal decreases due to kickback voltage
Solution Approach 1:
The gate off voltage is divided into two levels: first gate off voltage (initial level) and second gate off voltage (final lower level). The gate signal transitions through an intermediate state rather than directly from gate on voltage to gate off voltage, segmenting the voltage transition into multiple stages to reduce kickback voltage impact while maintaining switching speed
Solution Approach 2:
Before the gate signal reaches the final gate off voltage, a preliminary action is taken by introducing a first gate off voltage as an intermediate state. This preliminary voltage transition prepares the circuit by gradually reducing the voltage difference, thereby preventing sudden charge discharge and kickback voltage generation that would occur with direct voltage switching
2Device complexity
If the gate signal transitions directly from gate on voltage to gate off voltage, then the device complexity is reduced, but display quality decreases due to kickback voltage effects
Solution Approach 1:
The gate signal control is made dynamic by introducing time-dependent voltage levels. The gate signal transitions through different voltage states (gate on voltage → first gate off voltage → second gate off voltage) based on timing requirements, allowing the system to adaptively manage kickback voltage effects while maintaining reasonable control complexity through timed signal generation
Data Source
AI summary
A display apparatus includes a display panel, a data driving part and a gate driving part. The gate driving part outputs gate signals to gate lines, respectively, increases the gate signal from a first gate off voltage to a gate on voltage, decreases the gate signal from the gate on voltage to the first gate off voltage, decreases the gate signal from the first gate off voltage to a second gate off voltage in a slope less than a slope in which the gate signal decreases from the gate on voltage to the first gate off voltage, during P (P is a natural number) horizontal time in which P gate line of the gate lines is driven, and increases the gate signal from the second gate off voltage to the first gate off voltage.