Boosting-On and Boosting-Off Gate Driving Voltages for Display Devices
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Solution Overview
Problem
Conventional display devices experience fluctuations and ripples in gate signals due to large variations in gate-on and gate-off voltages, leading to increased power consumption and flicker differences across the display panel, especially when these voltages are boosted regardless of signal output.
Innovation Solution
A display device with a signal controlling unit, data driving unit, gate driving voltage generating unit, and gate driving unit that outputs boosting-on and boosting-off gate driving voltages only during specific periods of the frame period, based on control signals derived from vertical and horizontal synchronization signals and a clock signal, to stabilize gate signals and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If boosted gate-on voltage and boosted gate-off voltage are supplied to the gate driving unit regardless of whether the gate signal is output, then the gate driving unit can maintain stable voltages, but power consumption of the display device increases
Solution Approach 1:
The patent implements periodic action by switching between boosting-on and boosting-off gate driving voltages based on the frame period. During the display period, boosting-on voltage is supplied to maintain stable gate signals, while during the blank period, boosting-off voltage is supplied to reduce power consumption. This periodic switching resolves the contradiction by providing stability only when needed (during display) and reducing energy consumption during idle periods (blank period).
Solution Approach 2:
The patent applies dynamics by making the gate driving voltage adjustable and time-dependent. The gate driving voltage generating unit dynamically switches between two operating states (boosting-on and boosting-off) based on control signals derived from the vertical synchronization signal. This dynamic adjustment allows the system to optimize between stability and power consumption at different times in the frame period.
2Stability of the object's composition
If boosted gate-on voltage and boosted gate-off voltage are supplied continuously, then gate signal stability is improved, but the fluctuation and ripple of gate signals increase due to large voltage variations during blank period
Solution Approach 1:
The patent uses periodic action to switch between boosting-on and boosting-off voltages according to the display period and blank period. During the display period when gate signals are actively driven, boosting-on voltage maintains signal stability. During the blank period when no gate signals are output, boosting-off voltage prevents large voltage variations that would cause fluctuation and ripple. This periodic switching eliminates the harmful effect of continuous boosting while maintaining stability during active display.
Solution Approach 2:
The patent extracts the boosting function from continuous operation and applies it selectively only during the display period. The boosting unit is controlled to operate only when needed (during display period when gate signals are active) and is turned off during the blank period. This extraction of the boosting function from continuous operation eliminates the source of voltage fluctuations and ripples while maintaining gate signal stability during active display periods.
3Use of energy by moving object
If gate driving voltage is reduced during blank period, then power consumption is reduced, but gate-on voltage increases and gate-off voltage is lowered causing instability
Solution Approach 1:
The patent applies periodic action by switching between boosting-on and boosting-off modes based on the frame period phases. During the display period, boosting-on voltage is supplied to maintain stable gate voltages for active pixel driving. During the blank period, boosting-off voltage is supplied to reduce power consumption since no gate signals are being output. This periodic switching ensures that power reduction during blank period does not compromise stability during display period, as each phase has optimized voltage supply for its specific function.
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 solution reduces the fluctuation and ripple of gate signals, minimizes power consumption, and improves image quality by maintaining stable gate-on and gate-off voltages, thereby reducing flicker differences across the display panel.
Implementation Method 1
a gate driving voltage generating unit configured to receive a part of the control signals and an analog driving voltage, the gate driving voltage generating unit being configured to output a boosting-on gate driving voltage during a boosting-on period corresponding to a part of the frame period and a boosting-off gate driving voltage during a boosting-off period corresponding to a remainder of the frame period
Data Source
AI summary
A display device, including a signal controlling unit, a data driving unit, a gate driving voltage generating unit, a gate driving unit, and a display panel. The display panel displays an image during a frame period including a blank period and a display period. The gate driving voltage generating unit receives a control signal and an analog driving voltage. The gate driving voltage generating unit generates boosting-on and boosting-off gate driving voltages based on the analog driving voltage. The gate driving voltage generating unit outputs the boosting-on gate driving voltage during a part of the frame period and the boosting-off gate driving voltage during a remaining of the frame period.