Active Matrix Display Data Line Drive Circuit Parasitic Capacitance
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Solution Overview
Problem
Active matrix display devices with multiple data lines connected to a single output signal line experience display unevenness due to parasitic capacitance, particularly in high-definition displays with color filters, leading to suboptimal image quality.
Innovation Solution
The implementation of a selection order changing section that controls the connection order of data lines to the output signal line, prioritizing data lines corresponding to colors with lower brightness contributions first and last during each horizontal period, and varying this order between horizontal and vertical periods to minimize brightness differences between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple data lines are connected to a single output signal line, then the device complexity and manufacturing cost are reduced, but display unevenness occurs due to parasitic capacitance
Solution Approach 1:
The patent applies dynamic switching of connection orders between data lines and output signal lines. The selection order changing section dynamically adjusts which data line connects to which output signal line based on the scanning sequence, making the system adaptive rather than static. This dynamic reconfiguration allows the system to maintain display uniformity while using fewer output signal lines.
Solution Approach 2:
The patent changes the connection parameter (which data line connects to which output signal line) based on the scanning sequence. By varying the connection order parameter dynamically during operation, the system compensates for parasitic capacitance effects and maintains consistent display quality across all pixels.
2Ease of operation
If data lines are connected in fixed order to output signal lines, then the circuit operation is simple, but brightness differences occur between pixels due to parasitic capacitance
Solution Approach 1:
The connection order between data lines and output signal lines is made dynamic rather than fixed. The selection order changing section adjusts the connection sequence to match the scanning sequence, ensuring that pixels scanned at different times experience consistent electrical conditions despite parasitic capacitance variations.
Solution Approach 2:
The system uses the scanning sequence as feedback to determine the connection order. The selection order changing section monitors which pixel is being scanned and adjusts the data line connections accordingly, creating a closed-loop system that maintains brightness uniformity.
3Ease of manufacture
If the number of output signal lines is reduced, then the manufacturing cost decreases, but display quality deteriorates due to parasitic capacitance effects
Solution Approach 1:
By dynamically reconfiguring which data line connects to which output signal line based on the scanning sequence, the system achieves high display quality using fewer output signal lines. This dynamic approach eliminates the need for one output signal line per data line.
Solution Approach 2:
The connection parameters are changed dynamically to compensate for parasitic capacitance effects, allowing the system to maintain high display quality while using a reduced number of output signal lines, thereby lowering manufacturing cost.
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
This configuration effectively reduces display unevenness, enhancing the overall display quality by minimizing the impact of parasitic capacitance and ensuring consistent brightness across pixels.
Implementation Method 1
each data line is provided with a selection switch that controls electrical continuity between the data line and the corresponding output signal line of the data line drive circuit
Implementation Method 2
Active matrix display devices with multiple data lines connected to a single output signal line experience display unevenness due to parasitic capacitance
Data Source
AI summary
In an active matrix display device including pixels of three colors having a stripe arrangement or a delta arrangement, n (n denotes a multiple of 3 that is 6 or larger) adjacent data lines form one group and are connected to a source signal output line. The ON/OFF of a selection switch provided for each data line is controlled so that, among the n data lines forming one group, data lines corresponding to pixels of a color with a contribution to brightness smaller than a contribution of at least another color among the three colors are connected first and last with the source signal output line during one horizontal period.