Privacy Display Voltage Switching to Reduce Touch Smear
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Solution Overview
Problem
The existing display apparatuses with touch sensors in privacy mode exhibit a smear phenomenon due to slow restoration of liquid crystal arrangements when touched, causing visibility issues in sharing mode.
Innovation Solution
A display apparatus with a privacy liquid crystal module and a touch sensing module, where the privacy liquid crystal module is voltage-controlled to switch between modes, applying a second voltage for a predetermined time when touched to enhance the speed of liquid crystal restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the privacy liquid crystal module is not applied with an electric field in sharing mode, then the visual experience in sharing mode is improved, but the liquid crystal restoration speed is slow causing smear phenomenon
Solution Approach 1:
The patent applies periodic voltage control to the privacy liquid crystal module. In sharing mode, instead of maintaining a constant zero voltage, the system periodically applies a second voltage (higher than first voltage) for specific time intervals when touch is detected, then switches to first voltage (lower than second voltage) during non-touch periods. This periodic voltage application accelerates liquid crystal restoration speed during touch events while maintaining good visual experience during normal sharing mode operation.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on touch detection. When touch is detected in sharing mode, the voltage parameter switches from first voltage to second voltage, creating a parameter change that accelerates liquid crystal response. After the touch event, the voltage returns to the first level. This parameter change strategy resolves the contradiction by using higher voltage only when necessary for restoration speed.
2Object-affected harmful factors
If a higher voltage is applied to accelerate liquid crystal restoration, then the smear phenomenon is reduced, but the energy consumption increases
Solution Approach 1:
The system uses periodic voltage application where the higher second voltage is applied only during specific time intervals when touch events occur, rather than continuously. During non-touch periods, the system switches to the lower first voltage or zero voltage state. This periodic strategy reduces energy consumption compared to continuous high voltage application while still effectively eliminating smear phenomenon during touch events.
Solution Approach 2:
The system applies the second voltage in advance when touch detection occurs, before the smear phenomenon can fully develop. By detecting touch early and immediately applying the higher voltage, the system prevents smear formation rather than correcting it afterward, reducing the duration and magnitude of energy consumption needed.
3Ease of operation
If the liquid crystal arrangement is deformed by external force during touch, then the touch function is enabled, but the display light trajectory is deflected causing smear
Solution Approach 1:
The system applies a counteracting electric field (second voltage) when touch detection occurs, which opposes and counteracts the deformation caused by the external finger force. This preliminary anti-action prevents the liquid crystal molecules from maintaining the deformed state that causes smear, allowing them to quickly return to their original arrangement despite the mechanical disturbance from touch operation.
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 significantly reduces the smear phenomenon by accelerating the restoration of liquid crystal arrangements, improving the visual experience in sharing mode.
Implementation Method 1
The privacy liquid crystal module is voltage-controlled to switch the display apparatus between the privacy mode and the sharing mode
Implementation Method 2
The privacy display is to provide an electric field to control the arrangement of liquid crystal molecules and modulate light differently
Implementation Method 3
The touch sensing module is disposed on a side of the privacy liquid crystal module and is configured to generate a touch signal
Data Source
AI summary
A display apparatus having a privacy mode and a sharing mode is provided. The display apparatus includes a display panel, a privacy liquid crystal module, and a touch sensing module. The touch sensing module is disposed on a side of the privacy liquid crystal module and is configured to generate a touch signal. When the display apparatus is in the privacy mode, the privacy liquid crystal module is applied with a first voltage. When the display apparatus is in the sharing mode and the touch sensing module generates the touch signal, the privacy liquid crystal module is applied with a second voltage for a predetermined time. After maintaining for the predetermined time, a third voltage is applied to the privacy liquid crystal module. The display apparatus can effectively reduce a smear phenomenon caused by the display apparatus being touched in a sharing mode.