Liquid Crystal Display Brightness Compensation for Touch Deformation
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Solution Overview
Problem
Conventional liquid crystal display devices easily cause dark fringes when touched due to deformation of the liquid crystal display panel, which affects visual experience and recovery time.
Innovation Solution
A liquid crystal display device comprising a touch sensor, touch control board, mainboard, and logic board that converts user input into electrical signals to provide a compensation voltage to offset deformation by adjusting the rotation angle of liquid crystals in the press region, using a grayscale compensation table to maintain target brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the liquid crystal display panel and touch sensor are made thin to reduce device thickness, then the device becomes more compact and portable, but the liquid crystal display panel easily deforms when touched causing dark fringes and long recovery time
Solution Approach 1:
The patent applies preliminary anti-action by detecting touch pressure in advance and applying compensatory voltage to counteract the deformation before it causes visible dark fringes. The system detects the touch event and immediately adjusts the liquid crystal orientation in the pressed region to maintain uniform brightness, preventing the harmful visual effect rather than reacting after the problem occurs.
Solution Approach 2:
The patent changes the electrical parameter (voltage) applied to the liquid crystal display panel dynamically based on the touch detection. By adjusting the voltage instruction according to the touch pressure and position, the system compensates for the deformation caused by thin panel structure, maintaining display quality while keeping the panel thin.
2Length of moving object
If the liquid crystal display panel is made thin to reduce device thickness, then the device becomes more compact, but the recovery time from deformation becomes long affecting visual feeling
Solution Approach 1:
The patent implements continuous useful action by maintaining the compensatory voltage adjustment throughout the touch event and recovery period. The system continuously monitors the touch state and adjusts the voltage to ensure the liquid crystal panel returns to its original uniform brightness state, extending the useful action beyond the immediate touch moment to ensure complete recovery.
3Reliability
If compensation voltage is applied to increase liquid crystal rotation angle in press region, then dark fringes are offset, but the complexity of the control system increases
Solution Approach 1:
The patent employs feedback by using the touch detection result (electrical signal from touch sensor) to determine the compensation voltage instruction. The system continuously monitors the touch state and adjusts the voltage accordingly, creating a closed-loop control system that automatically adapts to different touch conditions without requiring complex manual intervention.
Solution Approach 2:
The patent segments the liquid crystal display panel into different regions (press region and non-press region) based on touch detection. By applying different voltage instructions to different regions, the system simplifies the control strategy compared to requiring uniform compensation across the entire panel, making the complex compensation task more manageable through spatial segmentation.
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
Effectively mitigates dark fringes by ensuring the liquid crystal display panel maintains target brightness and reduces recovery time from deformation.
Implementation Method 1
the compensation voltage is configured to make a rotation angle of liquid crystals of a press region greater than a rotation angle of liquid crystals of a non-press region
Data Source
AI summary
The present invention provides a liquid crystal display device and brightness compensating method. The liquid crystal display device includes: a liquid crystal display panel; a touch sensor, configured to convert a press position and a press force of a user into an electrical signal; a touch control board, configured to scan and analyze electrical signal; a mainboard, configured to receive the scanned electrical signal and transmit a drive voltage instruction and a compensation voltage instruction; a logic board, comprises a code storage device storing a grayscale compensation table and an electrical level controller providing the liquid crystal display panel with a compensation voltage according to compensation voltage message, the compensation voltage is configured to make a rotation angle of liquid crystals of a press region greater than a rotation angle of liquid crystals of a non-press region.