Toggle Voltage Circuit for Display Flicker Reduction
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Solution Overview
Problem
Conventional display devices, such as LCDs and OLEDs, face challenges in efficiently controlling the transmittance of light through liquid crystal layers due to limitations in voltage application methods, leading to issues like flicker and afterimages, particularly in vertical alignment type LCDs.
Innovation Solution
A display apparatus and method that incorporate a toggle voltage input circuit applying a periodically varying voltage between 6.5V and 9.5V to sub-pixels, utilizing a toggle signal and DC voltage amplified by an operational amplifier, to manage voltage distribution across switching elements and storage lines, reducing flicker and afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional voltage application method is used in vertical alignment type LCDs, then the basic display function is maintained, but flicker and afterimage problems occur due to inefficient control of light transmittance
Solution Approach 1:
The patent applies periodic action by introducing a toggle voltage that switches between high and low states in a periodic manner. This toggle voltage is applied to the storage line of the second sub-pixel, causing the voltage to oscillate between approximately 6.5V and 9.5V. This periodic voltage variation dynamically controls the liquid crystal layer's transmittance, preventing the formation of afterimages and reducing flicker by continuously adjusting the electric field strength in the liquid crystal layer.
Solution Approach 2:
The patent implements dynamics by transitioning from a static voltage application method to a dynamic voltage control system. The toggle voltage input circuit enables real-time adjustment of the storage line voltage based on periodic signals, allowing the system to adaptively control the liquid crystal layer's state. This dynamic control mechanism responds to changing display conditions and actively prevents harmful visual effects like flicker and afterimages.
2Adaptability or versatility
If a fixed storage voltage is applied to the storage line, then the circuit structure remains simple, but the ability to control light transmittance efficiently is limited
Solution Approach 1:
The patent introduces periodic action through a toggle voltage input circuit that generates periodic toggle signals. These signals control the storage line voltage to switch between high and low states, enabling dynamic adjustment of the liquid crystal layer's transmittance. The periodic voltage variation provides enhanced control capability over light transmission while maintaining a relatively simple circuit architecture through the use of standard switching elements and voltage generation circuits.
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 effectively reduces flicker and afterimage occurrences by varying the toggle voltage across sub-pixels, improving image quality and display performance.
Implementation Method 1
an amplifier configured to output the toggle voltage by amplifying a voltage based on the toggle signal and the DC voltage
Implementation Method 2
a liquid crystal layer having dielectric anisotropy interposed between the upper and lower panels
Implementation Method 3
Voltages are applied to the pixel electrode and the opposing electrode to generate an electric field in the liquid crystal layer. The intensity of the electric field controls the transmittance of light passing through the liquid crystal layer
Data Source
AI summary
A display apparatus includes a display panel. The display panel includes a high sub-pixel, a low sub-pixel and a toggle voltage input circuit. The high sub-pixel may include a first switching element connected to a gate line extending in a first direction and a data line extending in a second direction crossing with the first direction. The low sub-pixel may include a second switching element connected to the gate line and the data line and disposed opposite to the high sub-pixel with reference to the gate line, and a third switching element connected to the second switching element and a storage line. The toggle voltage input circuit may be connected to the storage line to transmit a toggle voltage to the low sub-pixel. The toggle voltage may be capable of being varied periodically.