Display Compensation Circuit with Delay-Controlled Common Voltage Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies face issues with abnormal display images when switching between common voltage compensation and polarity inversion methods, leading to instability and loss of common voltage.
Innovation Solution
A compensation circuit with a timing controller, power management circuit, operational amplifier circuit, and delay circuit that controls the output of common and operating voltages to the display panel and operational amplifier, using a partial decode-and-forward signal to manage polarity inversion and stabilize the operational amplifier's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switching is performed between common voltage compensation method and polarity inversion method, then display quality can be improved by solving different display problems, but abnormal display images occur due to instantaneous voltage loss and operational amplifier state changes
Solution Approach 1:
The delay circuit is configured to output the operating voltage to the operational amplifier circuit before outputting the common voltage to the display panel. This preliminary action ensures the operational amplifier is ready to receive and process the common voltage signal, preventing instantaneous voltage loss and abnormal display images during mode switching between common voltage compensation and polarity inversion methods
Solution Approach 2:
The delay circuit acts as an intermediary between the power management circuit and the operational amplifier circuit. It controls the timing and sequence of voltage output, delaying the operating voltage to the operational amplifier until the common voltage is stable, thereby mediating the transition and preventing harmful voltage fluctuations during method switching
2Measurement precision
If the operational amplifier circuit receives common voltage and feedback voltage simultaneously, then compensating voltage can be calculated accurately, but instantaneous voltage loss occurs during mode switching causing instability
Solution Approach 1:
The delay circuit outputs the operating voltage to the operational amplifier circuit in advance, before the common voltage is output to the display panel. This ensures the operational amplifier is powered and ready to accurately process the common voltage and feedback voltage signals, preventing instability during mode switching while maintaining compensating voltage accuracy
Data Source
AI summary
A compensation circuit and a display device. The compensation circuit includes a timing controller, a power management circuit, an operational amplifier circuit, and a delay circuit. The delay circuit is configured to prolong a time duration of the operational amplifier circuit in the operating state in a first stage, and the delay circuit controls the operational amplifier circuit to stop operation when the delay circuit is able to stably output a common voltage to the display panel. A time duration of outputting the common voltage to the display panel is prolonged in a second stage. When the operational amplifier circuit is in the operation state, the delay circuit stops outputting the common voltage to the display panel.