Digitizer Charging Synchronization for Stable Display Image Quality
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Solution Overview
Problem
Display apparatuses experience degradation in image quality during the transmission of electrical signals to input units due to synchronization issues between charging signals and scan signals.
Innovation Solution
A display apparatus with a digitizer that synchronizes the frequency of charging signals to a time period T, where T is the time taken for a scan signal to be applied to a row and the next row, ensuring phases of the charging signal are consistent across rows, and uses a sine wave waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the digitizer transmits a charging signal to the input unit, then the input unit receives power, but the image quality degrades due to synchronization issues between charging signals and scan signals
Solution Approach 1:
The charging signal is transmitted in periodic synchronization with the scan signal cycle. The frequency of the charging signal is set to match the scan rate (e.g., 60Hz or 120Hz), ensuring that charging occurs during specific time windows when scan signals are active. This periodic transmission maintains image quality while enabling power delivery to the input unit.
Solution Approach 2:
The system dynamically adjusts the charging signal parameters based on the scan signal state. When scan signals are being transmitted to the display panel, the charging signal is activated; when scan signals are inactive, charging is suspended. This dynamic control prevents interference with the display refresh cycle and maintains image stability.
2Adaptability or versatility
If the frequency of the charging signal is not synchronized to the scan signal period T, then charging can occur independently, but phases of the charging signal vary across rows causing image degradation
Solution Approach 1:
The system uses the scan signal as a reference feedback mechanism to control charging signal timing. By detecting the phase and frequency of the scan signal, the system adjusts the charging signal phase to maintain consistent alignment across all rows. This feedback loop ensures that charging occurs at the same relative phase for each row, preventing image artifacts.
Solution Approach 2:
The charging signal is synchronized to achieve equipotential phase relationships across all display rows. By aligning the charging signal phase with the scan signal period T, the system ensures that all rows experience charging at equivalent phases in their respective cycles, eliminating phase-related image degradation and maintaining uniform display quality.
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 synchronization enhances the quality of displayed images by maintaining consistent signal phases, reducing image degradation and improving overall display performance.
Implementation Method 1
the charging signal may be a signal to generate an induced current in a charging coil of the input unit
Data Source
AI summary
A display apparatus includes: a display panel including a display region including pixels located in n rows, where n is a natural number; and a digitizer overlapping with the display panel, the digitizer to transmit a charging signal to an input unit and receive a position signal from the input unit. When the digitizer transmits the charging signal to the input unit, a frequency of the charging signal is synchronized to T, where T is a time taken from when a scan signal is applied to a first row of the display region from among the n rows to when a scan signal is applied to the first row a next time.