Voltage Shift Circuit for Display Driving
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Solution Overview
Problem
Conventional display technologies face challenges in efficiently transitioning between high and low voltages during clock signal transitions, leading to power wastage and potential 'splash screen' issues in high temperature reliability tests due to simultaneous voltage adjustments.
Innovation Solution
A voltage shift circuit utilizing transistors and a capacitor to lower a high voltage and raise a low voltage to a common output voltage, with overlapping transition times to avoid power wastage and 'splash screen' phenomena, employing rectangular or square wave signals with edge shifts to align transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high and low voltages are lowered and raised to a same reference voltage at the same time by means of charge sharing, then power consumption is reduced, but 'splash screen' issues occur in high temperature reliability tests
Solution Approach 1:
The patent divides the voltage transition process into separate time periods for high voltage lowering and low voltage raising. Instead of simultaneous charge sharing, the circuit first lowers the high voltage to a reference level, then subsequently raises the low voltage to the same reference level. This temporal segmentation eliminates the splash screen effect while maintaining power efficiency.
Solution Approach 2:
The patent performs the high voltage lowering action before the low voltage raising action. By completing the high voltage transition first and establishing a stable reference voltage, the circuit prevents the simultaneous voltage conflict that causes splash screens, while still achieving overall power savings through the coordinated sequence.
2Loss of energy
If simultaneous voltage adjustments are performed using charge sharing, then power is saved, but charge wastage occurs leading to splash screen phenomena
Solution Approach 1:
The patent segments the voltage adjustment process into distinct phases: first adjusting the high voltage level, then adjusting the low voltage level. This prevents the simultaneous charge sharing that causes both energy wastage and splash screen phenomena, while maintaining efficient power usage through coordinated sequential operation.
Solution Approach 2:
The patent skips the problematic simultaneous charge sharing phase entirely. By rushing through the high voltage adjustment first and immediately followed by the low voltage adjustment without overlap, the circuit avoids the harmful interaction that causes both energy loss and splash screens.
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
The solution enables efficient power saving and prevents 'splash screen' issues in high temperature tests by misaligning voltage transitions, ensuring no charge wastage and maintaining reliable signal transitions.
Implementation Method 1
the capacitor is configured to store charges according to the first signal and to release charges according to the second signal
Data Source
AI summary
The present application discloses a voltage shift circuit and a driving method thereof, a driving device and a display apparatus. The voltage shift circuit includes: a first input terminal, a second input terminal, a first voltage terminal, a second voltage terminal, and an output terminal. The first input terminal is configured to input a first signal. The second input terminal is configured to input a second signal. The first voltage terminal is configured to input a first voltage. The second voltage terminal is configured to input a second voltage. The output terminal is configured to output an output signal. The voltage shift circuit is configured to lower the first voltage to an output voltage within a first time using the first signal, and to raise the second voltage to the output voltage within a second time using the second signal. The first time partially overlaps with the second time.