Display Power Voltage Generator Dynamic Response Speed Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display apparatuses face issues with peak current exceeding threshold levels when displaying high grayscale patterns, leading to operational failures and image flickering due to mismatched timing between input image data reduction and power voltage decrease.
Innovation Solution
A display apparatus with a power voltage generator that adjusts its response speed based on input image data, switching between faster and slower response speeds depending on luminance changes, using a data analyzer and time constant selector to connect to different time constant circuits, ensuring peak current management and minimizing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power voltage is decreased to reduce peak current when displaying high grayscale patterns, then the peak current is reduced below threshold level, but the operation timing does not coincide with image data decrease timing causing image flickering
Solution Approach 1:
The patent applies dynamics by making the power voltage response speed variable rather than fixed. The power voltage generator dynamically adjusts its response speed based on the luminance change detected in input image data. When luminance increases (high grayscale patterns), the response speed is slowed down to match the image data decrease timing, preventing flickering. When luminance decreases or remains stable, the normal faster response speed is maintained for optimal display performance. This dynamic adaptation resolves the contradiction between peak current management and flicker prevention.
Solution Approach 2:
The patent changes the parameter of power voltage response speed based on luminance conditions. A luminance change detector identifies when luminance exceeds a threshold, and a controller adjusts the power voltage generator's response speed parameter accordingly. When luminance change is detected, the controller modifies the response speed parameter to synchronize power voltage decrease with image data decrease timing, eliminating flickering while maintaining reliable peak current management.
2Reliability
If the input image data is decreased to reduce peak current, then the peak current is reduced below threshold level, but the timing mismatch with power voltage decrease causes image flickering
Solution Approach 1:
The patent implements feedback through a luminance change detector that continuously monitors input image data luminance levels. When the detector identifies luminance changes indicating high grayscale patterns, it provides feedback to the controller, which then adjusts the power voltage generator's response speed. This closed-loop feedback system ensures that peak current is reliably controlled while simultaneously maintaining display stability by synchronizing power voltage adjustments with image data changes, eliminating flickering.
Solution Approach 2:
The patent applies preliminary action by detecting luminance changes in advance and proactively adjusting the power voltage response speed before flickering occurs. The luminance change detector identifies upcoming high grayscale patterns, and the controller pre-adjusts the power voltage generator's response speed to match the required timing, preventing flickering before it happens while maintaining reliable peak current control.
3Device complexity
If a fixed response speed is used for power voltage generation, then the circuit design is simple, but the timing cannot be adjusted to match luminance changes causing flickering
Solution Approach 1:
The patent transforms the static power voltage generator into a dynamic system that adapts its response speed based on luminance conditions. By incorporating a luminance change detector and controller, the system dynamically adjusts the power voltage generator's response speed parameter. This dynamic capability eliminates flickering caused by fixed timing while maintaining relatively simple circuit architecture through efficient use of control logic and parameter adjustment rather than complex hardware modifications.
Solution Approach 2:
The patent changes the operational parameter of the power voltage generator (response speed) based on detected luminance conditions. Rather than redesigning the entire generator circuit, the solution modifies the response speed parameter dynamically. When luminance changes indicating high grayscale patterns are detected, the controller adjusts the response speed parameter to synchronize with image data timing, eliminating flickering while keeping the overall device complexity manageable through parameter-based control.
Data Source
AI summary
A display apparatus includes: a display panel configured to display an image based on input image data; a gate driver configured to output a gate signal to the display panel; a data driver configured to output a data voltage to the display panel; and a power voltage generator configured to generate a power voltage and output the power voltage to cause an image to display on the display panel. The power voltage has a response speed that varies according to the input image data.