Display Data Driver Mux Control for Faster Data Voltage Slew
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increase in panel load leads to a decrease in slew rate of the data voltage, resulting in insufficient supply time to pixels, which deteriorates the image quality of display panels.
Innovation Solution
A data driver that controls the slew rate of data voltage by managing the operation mode of switching elements in a demultiplexer based on the turn-on state and overlap of mux control signals, using calculators to optimize the source output enable signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the panel load increases, then more data lines can be driven, but the slew rate of data voltage decreases
Solution Approach 1:
The patent implements dynamic control of the switching element's operation mode based on real-time detection of mux control signal states. The calculator continuously monitors whether multiple mux control signals are simultaneously in the turn-on state, and dynamically switches between high-impedance mode and driving mode accordingly. This dynamic adaptation allows the system to maintain optimal slew rate regardless of panel load conditions.
Solution Approach 2:
The patent changes the operational parameters of the switching element by switching between two distinct operation modes: high-impedance mode and driving mode. In high-impedance mode, the switching element has minimal impact on the data voltage slew rate. In driving mode, the switching element actively drives the data line. This parameter change allows the system to optimize performance based on panel load conditions.
2Productivity
If multiple switching elements are turned on simultaneously, then more pixels can be supplied with data voltage, but interference and noise increase
Solution Approach 1:
The calculator acts as an intermediary between the mux control signals and the switching element. It monitors the states of multiple mux control signals and determines whether their turn-on periods overlap. Based on this analysis, it generates the source output enable signal that controls the switching element. This intermediary function prevents the switching element from being activated during periods when multiple data lines would conflict, thereby reducing interference and noise.
3Duration of action of moving object
If the data voltage is supplied for a sufficient period of time, then pixel luminance is maintained, but the slew rate decreases due to panel load
Solution Approach 1:
The patent uses the calculator to predict whether multiple mux control signals will be simultaneously active in the future. Based on this prediction, it proactively adjusts the switching element's operation mode before the actual conflict occurs. This preliminary action prevents slew rate degradation before it happens, ensuring that data voltage is supplied with adequate speed to maintain pixel luminance.
Data Source
AI summary
A display device in some examples can include a display panel on which a plurality of sub-pixels are arranged, a data driver configured to provide a data voltage to the plurality of sub-pixels through a plurality of data lines, and a demultiplexer connected between the data driver and the plurality of data lines. The demultiplexer is configured with a plurality of switching elements controlled by a plurality of mux control signals.