GOA Circuit Segmentation for In-Cell Touch Display Luminance
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Solution Overview
Problem
In-cell touch display panels experience uneven display due to current leakage during the transition from display to touch panel scanning, leading to reduced luminance and an overall suboptimal viewing experience.
Innovation Solution
A driving method and driver circuit that differentiate GOA units into first and second types, with the first type having a larger circuit size than the second, utilizing a CMOS GOA circuit with additional inverters to enhance charging of horizontal scan lines, specifically increasing the thrust for lines starting after touch panel scanning to compensate for charge loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time-sharing scanning is used between display and touch panel terms, then the touch panel function can be activated, but current leakage occurs during TP term causing uneven display and reduced luminance
Solution Approach 1:
The patent segments the GOA units into two distinct types: first type GOA units with larger circuit size for lines scanned after TP scanning, and second type GOA units with standard circuit size for other lines. This segmentation allows differential charging strategies to address the specific problem of current leakage during TP terms while maintaining normal operation for other lines.
Solution Approach 2:
The patent applies local quality by providing enhanced charging capability (larger circuit size) specifically to the first type GOA units that serve lines scanned after TP scanning, while other lines use standard GOA units. This localized enhancement targets the specific area where current leakage occurs during TP terms, improving luminance uniformity without unnecessarily increasing the size of all GOA units.
2Illumination intensity
If the circuit size of all GOA units is increased to compensate for charge loss, then luminance can be improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of uniformly increasing the size of all GOA units, the patent applies local quality by enhancing only the first type GOA units that require additional charging capability. This selective approach improves luminance where needed while avoiding unnecessary complexity in other parts of the display.
Solution Approach 2:
The patent segments GOA units into two categories with different circuit sizes, allowing the system to achieve the necessary luminance compensation only where required (after TP scanning) rather than throughout the entire display, thereby reducing overall device complexity.
3Manufacturing precision
If the charging ratio is increased for all horizontal scan lines, then uneven display can be compensated, but the energy consumption and heat generation increase
Solution Approach 1:
The patent applies local quality by providing enhanced charging (higher charging ratio) only to the first type GOA units that serve lines scanned after TP scanning, while other lines use standard charging ratios. This localized approach improves display uniformity without unnecessarily increasing energy consumption across the entire display.
Solution Approach 2:
By segmenting GOA units into two types with different charging capabilities, the patent concentrates energy expenditure only where needed to compensate for TP-term current leakage, rather than uniformly increasing energy consumption for all scan lines.
Data Source
AI summary
The invention provides a driving method and driver circuit for in-cell touch display panel. The method comprises: Step 10: providing a GOA circuit, comprising a plurality of cascade GOA units; Step 20: controlling the n-th stage GOA unit to charge the n-th horizontal scan line of the touch display panel following a preset timing sequence; Step 30: dividing GOA units into first and second types of GOA units, with each first type GOA unit corresponding to a first horizontal scan line at which a next scanning starting after completing a TP scanning, and the remaining GOA units as second type GOA unit; Step 40: the size of first type GOA unit being greater than the circuit of second type GOA unit to provide a greater thrust to corresponding scan line than second type GOA unit. As such, the uneven display phenomenon of in-cell touch display panel is improved.