Timing Compensator Circuit for Display Data Power Ripple
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display quality is deteriorated due to ripples in the data power voltage provided to the data driver in display apparatuses, leading to potential drops in data power voltage during active periods, which can affect the uniformity of display panel driving signals and increase power consumption.
Innovation Solution
A power voltage generating circuit with a timing compensator that adjusts the output timing of the data voltage by comparing feedback data power voltage with a reference voltage, ensuring the data power voltage is maintained at a stable level during active periods by advancing the output timing to the vertical blank period, and utilizing a capacitor, inductor, diode, switch, resistor, error amplifier, and comparator to control the waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data driver operates during the active period, then data voltage output is achieved, but data power voltage drops due to load, deteriorating display quality
Solution Approach 1:
The timing compensator advances the output timing of the data voltage to the vertical blank period before the active period. This preliminary action allows the data power voltage to be stabilized before the data driver begins operating, preventing voltage drops during the active period when data output is required.
Solution Approach 2:
The timing compensator includes a comparator that compares the feedback data power voltage with a reference voltage. When the feedback voltage is detected to be lower than the reference voltage, the timing compensator generates a timing compensation signal to adjust the output timing, creating a closed-loop feedback control system that maintains voltage stability.
2Reliability
If the output timing is advanced to vertical blank period, then data power voltage stability is improved, but timing control complexity increases
Solution Approach 1:
The timing compensator acts as an intermediary component between the driving controller and the data driver. It receives the vertical start signal from the driving controller, processes it through the comparator and timing compensation logic, and generates the compensated timing signal that advances the output timing to the vertical blank period, thereby managing the timing control complexity in a modular fashion.
3Reliability
If data power voltage is stabilized during active period, then display quality is enhanced, but power consumption increases due to timing adjustment
Solution Approach 1:
The timing compensation is applied periodically at the beginning of each frame's vertical blank period. The timing compensator uses the vertical start signal to trigger the comparison and timing adjustment process only when needed (at the start of each frame), rather than continuously, thereby minimizing power consumption while maintaining display quality throughout the active period.
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
Prevents deterioration of display quality by maintaining data power voltage stability during active periods, ensuring uniform display panel driving signals and reducing power consumption by minimizing voltage drops during vertical blank periods.
Implementation Method 1
a capacitor comprising a first electrode connected to an input node and a second electrode connected to a ground
Implementation Method 2
an inductor comprising a first end portion connected to the input node and a second end portion connected to a first node
Implementation Method 3
a diode comprising an anode electrode connected to the first node and a cathode electrode connected to an output node
Data Source
AI summary
A display apparatus includes a display panel, a data driver, a power voltage generator, a driving controller and a timing compensator. The display panel displays an image based on input image data. The data driver outputs a data voltage to the display panel. The power voltage generator outputs a data power voltage to the data driver. The driving controller controls a driving timing of the data driver. The timing compensator changes an output timing of the data voltage of the data driver when a feedback data power voltage is less than a reference data power voltage at a start point of an active period.