Display Device Kickback Compensation Voltage Control
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Solution Overview
Problem
Display devices, such as liquid crystal display devices, face image quality degradation due to parasitic capacitance-induced kickback voltage, which also increases power consumption, especially in partial display modes.
Innovation Solution
A display device with a display mode control unit that adjusts the supply of kickback compensation voltage and common voltage levels, and gate-on voltage during different display modes to minimize kickback voltage and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If kickback compensation voltage is supplied to lower kickback voltage, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic control of kickback compensation voltage supply based on display mode. The display mode control unit dynamically adjusts whether to supply kickback compensation voltage to the gate driving unit depending on whether full-screen or partial display mode is active, optimizing the balance between image quality and power consumption in real-time
Solution Approach 2:
The patent changes the voltage parameter conditions by supplying different voltage levels (first common voltage vs. second common voltage with lower voltage level) and kickback compensation voltage only when necessary. This parameter adjustment resolves the contradiction by maintaining image quality when needed while reducing power consumption when partial display is sufficient
2Manufacturing precision
If common voltage level is increased to compensate for kickback voltage, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent applies different voltage levels to different display scenarios. Instead of uniformly increasing common voltage for all display modes, it selectively applies higher first common voltage only when kickback compensation is needed, while using lower second common voltage for partial display modes where kickback is less problematic, thus optimizing both display quality and power consumption locally
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
Improves image quality by reducing kickback voltage and power consumption, particularly in partial display modes, by dynamically controlling voltage levels and timing of the gate signal.
Implementation Method 1
due to a parasitic capacitance of the switching element, a kickback voltage may be generated
Implementation Method 2
A voltage level of the second common voltage may correspond to a kickback voltage generated during the second display mode
Data Source
AI summary
The disclosed display device of improved display quality and reduced power consumption includes a display unit including pixels coupled to gate lines and data lines, a gate driving unit for outputting a gate signal to the gate lines, a data driving unit for outputting a data signal to the data lines, a voltage supply unit for supplying to the gate driving unit a gate-on voltage to generate the gate signal a gate-off voltage, and a kickback compensation voltage having a voltage level varied at a section of time of the gate-on voltage, and a display mode control unit for controlling the voltage supply unit to supply the kickback compensation voltage during a first display mode for displaying an image on an entire area of the display unit, and to block supply of the kickback compensation voltage during a second display mode for displaying an image on only a partial area.