Display Panel Pre-Charge via Dual-Side Transistor Arrays
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Solution Overview
Problem
High-resolution and large-size display panels face quality degradation due to resistive-capacitive (RC) effects and insufficient pixel charging, especially for pixels far from the source driver.
Innovation Solution
A display apparatus with a source driver coupled to one side of the display panel and a second array of transistors on the opposite side, performing pre-charge operations on odd- and even-numbered channels through different sides, with overlapping pre-charge periods and separate charge-sharing operations to improve charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If display panel size and resolution are increased, then display quality and pixel density are improved, but RC effects and insufficient pixel charging occur especially for pixels far from source driver
Solution Approach 1:
The display panel is divided into multiple scanning zones with different polarities (first polarity zones and second polarity zones). Odd-numbered channels are assigned to first polarity zones while even-numbered channels are assigned to second polarity zones. This segmentation allows independent pre-charge operations for different channel groups, ensuring adequate charging for pixels far from the source driver by utilizing both source driver and auxiliary driver from opposite sides.
Solution Approach 2:
An auxiliary driver is introduced as an intermediary component coupled to the second side of the display panel (opposite to the source driver). This auxiliary driver performs pre-charge operations on specific channels through the second side, acting as a mediator to deliver charging current to pixels that are far from the source driver, thereby compensating for insufficient charging in large-size displays.
2Device complexity
If pre-charge operation is performed on all channels through one side, then charging is simplified, but pixels far from source driver receive insufficient charge
Solution Approach 1:
Channels are segmented into odd-numbered channels and even-numbered channels, with each group assigned to different polarity zones. Odd-numbered channels receive pre-charge through the source driver (first side), while even-numbered channels receive pre-charge through the auxiliary driver (second side). This segmentation ensures that all channels receive adequate charging current regardless of their distance from the source driver.
Solution Approach 2:
Different pre-charge operations are applied to different channel groups based on their spatial location and polarity requirements. First pre-charge operation is applied to odd-numbered channels through the first side, while second pre-charge operation is applied to even-numbered channels through the second side. This localized approach optimizes charging efficiency for each region of the display panel.
3Productivity
If overlapping pre-charge periods are used for odd and even channels, then charging efficiency is improved, but control complexity increases
Solution Approach 1:
Pre-charge operations are performed in periodic alternating fashion: during a first pre-charge period, odd-numbered channels are pre-charged through the source driver while even-numbered channels are pre-charged through the auxiliary driver; during a second pre-charge period, the roles are reversed. This periodic action allows overlapping pre-charge periods that improve charging efficiency while maintaining manageable control through systematic alternation.
Solution Approach 2:
Pre-charge operations are performed before the main scanning operation to preliminarily charge the pixel capacitors. By performing pre-charge on odd and even channels during overlapping periods before scanning begins, the system ensures adequate voltage levels are established in advance, improving overall charging efficiency without interfering with the scanning 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
Enhances the performance of pre-charge and charge-sharing operations, reducing power consumption and improving image quality by efficiently charging pixels across the display panel, regardless of their distance from the source driver.
Implementation Method 1
perform a first pre-charge operation on the odd-number channels and perform a second pre-charge operation on the even-numbered channels through the second side of the display area
Implementation Method 2
quality degradation caused by resistive-capacitive (RC) effects and insufficient pixel charging for pixels that are located in a relatively far away from a source driver
Data Source
AI summary
A display apparatus includes at least one source driver and a display panel having a display area and a non-display area, in which the display area includes a first array of transistors and the non-display area includes a second array of transistors. The at least one source driver is coupled to a first side of the display area and is configured to drive the first array of transistors. The second array of transistors are coupled to a second side of the display area of the display panel and is configured to perform a first pre-charge operation on a plurality of odd-number channels of the display panel and perform a second pre-charge operation on a plurality of even-numbered channels of the display panel through the second side of the display area. The first side of the display area is opposite to the second side of the display area.