Liquid Crystal Display Flicker Control via Temperature-Adjusted Common Voltage
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Solution Overview
Problem
The flicker of liquid crystal display panels deteriorates with increasing temperature, affecting image quality due to a mismatch between the common voltage (Vcom) and the minimum flicker common voltage (best Vcom).
Innovation Solution
A display panel incorporating a temperature detection module, a timing control module, and a power management module that dynamically adjusts the common voltage based on real-time temperature readings, using multiple threshold temperatures to generate combination signals that control the power management module to output the corresponding common voltage, thereby minimizing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the operating time of the liquid crystal display device is increased, then the display function is maintained, but the temperature of the display panel increases causing flicker deterioration
Solution Approach 1:
The patent dynamically changes the common voltage parameter based on temperature conditions. When the display panel temperature exceeds a threshold, the system adjusts the common voltage from a first value to a second value, compensating for temperature-induced flicker and maintaining display quality during extended operation
Solution Approach 2:
The patent implements a feedback mechanism where the temperature detection module continuously monitors the display panel temperature and feeds this information to the power management module. This closed-loop control enables real-time adjustment of the common voltage to counteract temperature-related flicker effects
2Temperature
If the temperature of the display panel is increased, then the display continues to operate, but the difference between Vcom and best Vcom increases causing image quality degradation
Solution Approach 1:
The system dynamically adjusts the common voltage parameter in response to temperature changes. By detecting temperature increases and相应地 changing the common voltage from a first value to a second value, the system maintains the optimal voltage difference between Vcom and best Vcom, preserving image quality across varying temperature conditions
3Device complexity
If the common voltage remains unchanged during temperature increase, then the system structure is simple, but the flicker of the display panel deteriorates
Solution Approach 1:
The patent implements dynamic parameter adjustment by changing the common voltage based on temperature conditions. This approach resolves the contradiction by introducing necessary complexity only when needed (when temperature exceeds threshold), maintaining simplicity during normal operation while eliminating flicker during temperature-induced stress
Solution Approach 2:
The feedback mechanism selectively activates voltage adjustment only when temperature conditions warrant it. The temperature detection module triggers common voltage changes from first to second values only when thermal thresholds are exceeded, balancing system simplicity with flicker prevention
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
The solution effectively eliminates or decreases flicker deterioration by dynamically adjusting the common voltage to match the minimum flicker common voltage, improving image quality across varying temperatures.
Implementation Method 1
the temperature detection module includes a first temperature detection circuit and a second temperature detection circuit. The first temperature detection circuit is connected to the timing control module and configured to output the first sub signal having a different voltage level state according to a compared result of the real-time temperature and a first threshold temperature
Data Source
AI summary
A display panel and a display device are provided and relates to the display technology field. The display panel includes a temperature detection module, a timing control module, and a power management module. The timing control module identifies a real-time temperature of the display panel according to different combination signals outputted by the temperature detection module and controls the power management module to generate and output a corresponding common voltage according to the real-time temperature. The common voltage can follow a minimum flicker common voltage in real time.