Two-Side Input LCD Panel Source Driver Heat Suppression
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Solution Overview
Problem
High-definition and large-size liquid crystal display panels with a two-side input driving structure face issues of excessive source driver heating and potential dark areas due to insufficient charging ability, particularly when breaks occur in source bus lines.
Innovation Solution
A liquid crystal display panel design with a two-side input driving structure where source bus lines receive superposed display signal voltages from both sides, with buffer circuits to compensate for voltage drops in case of breaks, and optimized connections to reduce heat generation and charging requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a two-side input driving structure is used to reduce source driver charging ability requirements, then the charging ability required for each source driver is reduced, but source driver heat generation becomes excessive
Solution Approach 1:
The source bus line is divided into two separate input paths from opposite sides, with each source driver serving a specific segment. This segmentation allows the charging load to be distributed across two independent drivers, reducing the power requirement for each individual driver while maintaining adequate charging capability for the entire display region.
Solution Approach 2:
The patent introduces asymmetric voltage compensation mechanisms where source drivers apply different voltage levels to adjacent source bus lines depending on the break location. When a break is detected, the source driver on the intact side increases its output voltage to compensate for the voltage drop, while the source driver on the broken side reduces or stops output, creating an asymmetric driving pattern that prevents excessive heat generation in the compensated driver.
2Power
If source drivers are provided in frame regions on opposite sides with two-side input structure, then charging ability is improved, but dark areas occur when breaks occur in source bus lines
Solution Approach 1:
The patent implements a feedback mechanism where the system detects breaks in source bus lines and dynamically adjusts the driving voltages accordingly. When a break is detected in a source bus line, the control circuit receives this information and instructs the source drivers to adjust their output voltages, ensuring that pixels are driven through alternative paths with appropriate voltage levels, thereby preventing dark areas and maintaining display reliability.
Solution Approach 2:
The patent changes the voltage parameters dynamically based on the operational state. Source drivers apply different voltage levels to different source bus lines depending on whether those lines are intact or broken. By adjusting the voltage magnitude and polarity according to the detected break conditions, the system maintains adequate charging ability while preventing display defects.
3Illumination intensity
If dot inversion driving is used to reduce flicker, then display quality is improved, but source driver heat generation increases
Solution Approach 1:
The patent applies preliminary voltage compensation before the inversion cycle completes. When a break is detected, the source driver on the intact side pre-adjusts its voltage output to account for the upcoming polarity inversion, ensuring that the compensation is already in place before the inversion occurs. This preliminary action prevents the need for excessive voltage corrections during the inversion process, thereby reducing heat generation while maintaining flicker-free display quality.
Data Source
AI summary
A liquid crystal display panel includes: a plurality of first source drivers (35a) provided in a first frame region (20a), each first source driver supplying a first display signal voltage to source bus lines, from among a plurality of source bus lines (14s), that are associated with the first source driver; and a plurality of second source drivers (35b) provided in a second frame region (20b), each second source driver supplying a second display signal voltage to source bus lines, from among the plurality of source bus lines, that are associated with the second source driver. In each vertical scanning period, the first display signal voltage and the second display signal voltage are supplied to each of the plurality of source bus lines while being superposed on each other, and polarities of the first display signal voltage and the second display signal voltage do not change within each vertical scanning period.