Source Driving Chip Feedback for Display Voltage Consistency
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Solution Overview
Problem
In large-scale, high-resolution TFT-LCD displays, reducing the border size to lower costs leads to inconsistencies in output voltage and pixel voltage, causing uneven displays and color shifts due to tracing resistance and stray capacitance differences.
Innovation Solution
A display panel with a feedback line and a source driving chip that switches between two states, where the first state inputs a data signal and the second state feeds back voltage to ensure consistent pixel voltages across the display area, using an operational amplifier, voltage-to-current converting module, and switch unit controlled by a timer to maintain uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the border size is reduced to lower costs, then the area of each Source IC is increased, but the tracing resistance and stray capacitance differences become large, causing output voltage inconsistency and color shift
Solution Approach 1:
The patent introduces a feedback mechanism where the source driving chip reads pixel voltage values from the display panel and uses this feedback information to adjust subsequent data signals. This closed-loop control compensates for voltage inconsistencies caused by tracing resistance and stray capacitance variations, thereby maintaining output voltage consistency even when Source IC area is increased.
Solution Approach 2:
The patent dynamically changes the data signal parameters based on feedback from the display panel. By adjusting the voltage values of data signals according to actual pixel voltage measurements, the system compensates for electrical parameter variations (tracing resistance, stray capacitance) that occur when Source IC area is enlarged, thus resolving the contradiction between area increase and voltage consistency.
2Area of stationary object
If the border size is reduced to lower costs, then the area of each Source IC is increased, but uneven display and color shift occur due to electrical parameter differences
Solution Approach 1:
The feedback mechanism enables real-time monitoring and correction of display uniformity issues. By reading pixel voltage values and adjusting data signals accordingly, the system maintains reliable and uniform display performance across the entire panel, even when the Source IC area is increased to reduce border size.
Solution Approach 2:
The patent adjusts data signal voltage parameters dynamically to compensate for electrical variations across different regions of the display panel. This parameter adaptation ensures that display uniformity is maintained despite the increased Source IC area that leads to greater tracing resistance and stray capacitance differences.
3Manufacturing precision
If feedback mechanism is introduced to compensate for voltage inconsistency, then output voltage consistency is improved, but device complexity increases due to additional components
Solution Approach 1:
The source driving chip is designed to perform multiple functions: driving the display panel, reading pixel voltage feedback, and adjusting data signals. By integrating these functions into a single chip, the patent achieves voltage consistency through feedback while minimizing the increase in overall device complexity.
Solution Approach 2:
The patent combines the feedback reading function and the signal adjustment function within the existing source driving chip structure. By merging these functions rather than adding separate dedicated circuits, the increase in device complexity is minimized while still achieving the goal of output voltage consistency.
Data Source
AI summary
Disclosed are a display panel and a display device. The display panel includes a substrate defining a display area, a fan-out area and a source driving chip. A feedback line is arranged in the display area. The source driving chip has a first state and a second state. When the source driving chip is in the first state, a first data signal is input by the source driving chip to the feedback line; when the source driving chip is in the second state, a voltage of the feedback line is fed back to the source driving chip, to allow the source driving chip to output a second data signal to a remaining line of the display area. In each column, a summed number of the first data signal is equal to a summed number of the second dpata signal.