Data Control Circuit for Flat Panel Displays
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Solution Overview
Problem
The increasing number of data lines in flat panel display devices leads to a rise in the number of channels in the data driver, increasing manufacturing costs and causing power consumption and malfunction due to large voltage swings in control signals.
Innovation Solution
A data control circuit with a MUX driver that connects data channels to pixels in alternating fashion using control signals, reducing voltage swing and maintaining polarity consistency to minimize power consumption and prevent malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data lines is increased to achieve high resolution, then the display quality is improved, but the number of channels in the data driver increases leading to increased manufacturing cost
Solution Approach 1:
The patent segments the data driver channels and time-divides their operation. Instead of having all channels operate simultaneously, the data driver divides the horizontal period into multiple segments and activates different channels in each segment. This allows fewer physical channels to serve more data lines by sharing channel resources across different time periods, thereby reducing manufacturing cost while maintaining high display resolution.
Solution Approach 2:
The patent implements periodic action through time-division multiplexing where data driver channels are activated in periodic cycles. Each channel is selectively connected to different data lines at different time periods within a horizontal refresh cycle. This periodic switching enables a reduced number of channels to handle a larger number of data lines, resolving the contradiction between display resolution and channel quantity.
2Device complexity
If channel reduction is implemented to lower manufacturing cost, then device complexity is reduced, but large voltage swings in control signals cause malfunctions and increased power consumption
Solution Approach 1:
The patent applies equipotentiality by maintaining consistent voltage levels and polarity for control signals throughout the channel switching operation. The data driver is designed to keep control signal voltage within a stable range (e.g., 0V to Vdd) regardless of which channel is active or which data line is being driven. This prevents large voltage swings that would otherwise occur during channel switching, thereby maintaining signal stability and preventing malfunctions while still achieving channel reduction.
Solution Approach 2:
The patent changes the voltage level parameters of control signals to eliminate large swings. Instead of allowing control signals to swing across the full data voltage range (e.g., from -5V to +5V), the system adjusts control signal parameters to maintain them within a confined, stable voltage window. This parameter optimization reduces both the amplitude of voltage swings and the associated power consumption while maintaining reliable channel-reduced operation.
3Device complexity
If channel reduction is implemented to lower manufacturing cost, then device complexity is reduced, but power consumption increases due to large voltage swings
Solution Approach 1:
The patent reduces power consumption by maintaining equipotential conditions for control signals during channel switching. By keeping control signal voltage levels stable and avoiding large swings, the system minimizes the energy required to charge and discharge control line capacitances. This approach allows channel reduction to be implemented without the penalty of increased power consumption that would otherwise result from frequent, large-amplitude voltage transitions.
Solution Approach 2:
The patent optimizes power consumption by changing the voltage parameters of control signals. Instead of using full-range voltage swings, the system confines control signals to a narrower voltage window, thereby reducing the energy per switching event. When combined with channel reduction, this parameter optimization ensures that the overall power consumption does not increase despite the more frequent switching required to multiplex fewer channels across more data lines.
Data Source
AI summary
A data control circuit includes a MUX driver that electrically connects a first channel of a data driver and one of the pixels in a first pixel group of a display panel in response to a first control signal, and electrically connects a second channel of the data driver and one of the pixels in a second pixel group of the display panel in response to a second control signal; and a MUX controller that outputs the first and second control signals.