Display Driving Circuit Adjusts Charging Time for Uniform Panel
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Solution Overview
Problem
In large-sized display panels, such as TV panels of 65 inches or more, data signal attenuation occurs due to circuit load, leading to insufficient charging of pixel circuits at the far end, resulting in non-uniform panel charging and display quality issues like horizontal fine stripes.
Innovation Solution
A display driving device with a switching circuit that adjusts its turned-on time period based on control signals, ensuring that pixel circuits at greater distances from the data signal end receive extended charging times, matching the effective charging time of pixel circuits closer to the data signal end, thereby equalizing charging across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed charging time is used for all pixel circuits, then the charging process is simple, but pixel circuits at the far end cannot be charged sufficiently due to data signal attenuation
Solution Approach 1:
The patent applies dynamics by making the charging time adjustable rather than fixed. The control signal generation unit dynamically determines different charging times based on the position of pixel circuits along the source line, allowing the charging process to adapt to varying signal attenuation conditions and achieve uniform charging across the panel.
Solution Approach 2:
The patent applies local quality by providing different charging times to different regions of the panel. Pixel circuits at the far end receive longer charging times than those at the near end, with the control signal generation unit calculating position-based charging durations to ensure each region receives appropriate charging according to its specific conditions.
2Area of stationary object
If the data signal is transmitted to far-end pixel circuits, then the panel coverage is increased, but the data signal is attenuated causing insufficient charging
Solution Approach 1:
The patent applies preliminary action by having the control signal generation unit calculate and prepare extended charging times before the actual charging process. The system anticipates the signal attenuation that will occur in far-end pixel circuits and pre-compensates by allocating longer charging durations, ensuring reliable charging before the data signal degradation becomes problematic.
Solution Approach 2:
The patent applies parameter changes by modifying the charging time parameter based on the position of pixel circuits along the source line. The control signal generation unit adjusts the charging duration parameter dynamically, extending it for far-end pixel circuits to compensate for data signal attenuation and maintain charging reliability across the entire panel.
3Manufacturing precision
If the switching circuit is turned on for a longer time, then the charging time for far-end pixel circuits is extended, but the charging time for near-end pixel circuits must be reduced
Solution Approach 1:
The patent applies segmentation by dividing the panel into different regions based on their position along the source line. The control signal generation unit segments the charging process into different time periods for different regions, assigning longer charging times to far-end pixel circuits and shorter times to near-end pixel circuits, thereby achieving uniform charging without requiring all pixel circuits to receive maximum charging duration.
Data Source
AI summary
A display driving device is disclosed. The display driving device includes: a data signal end for providing a data signal, a source line, and a switching circuit. The source line can transmit the data signal to a first pixel circuit and a second pixel circuit. Along a direction of the source line, a distance between the second pixel circuit and the data signal end is larger than a distance between the first pixel circuit and the data signal end. The switching circuit is between the data signal end and the source line, and can be turned on in response to a first control signal, and can be turned on in response to a second control signal. A turned-on time period of the switching circuit in response to the second control signal is longer than a turned-on time period of the switching circuit in response to the first control signal.