Display Panel Synchronization to Eliminate Waterfall Defects
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses experience display defects such as waterfall defects due to interference noise caused by mismatched driving frequencies between the light source and panel driving signals, leading to uneven charge voltage distribution across pixels.
Innovation Solution
A display apparatus and method where the panel synchronization signal frequency matches the light source driving signal frequency, with a pulse width modulation signal controlling the light source, ensuring data and gate signals are applied only during the light source's ON period and blocked during the OFF period, maintaining uniform charge voltage across all pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light source driving signal frequency is different from the panel driving signal frequency, then the light source can operate independently with flexible control, but interference noise occurs causing display defects such as waterfall defects
Solution Approach 1:
The patent synchronizes the light source driving signal frequency with the panel driving signal frequency, changing the frequency parameter from independent to matched values. This eliminates interference noise and display defects while maintaining control flexibility through coordinated operation of the light source and panel at the same frequency
2Stability of the object's composition
If data voltage and gate signal are applied continuously, then the pixels can maintain stable voltage levels, but power consumption increases and voltage drops occur due to light leakage currents
Solution Approach 1:
The patent applies data voltage and gate signal periodically synchronized with the light source ON period. During the OFF period, signal application is blocked, creating a periodic on-off pattern that reduces power consumption while maintaining voltage stability during the active display period through synchronized timing
3Productivity
If the active period of frame period is longer, then more complete image data can be transmitted, but the charge uniformity across pixels deteriorates due to light leakage currents
Solution Approach 1:
The patent synchronizes the active period of the frame period with the light source ON period, creating a periodic timing relationship. This ensures that data transmission and pixel charging occur only when light is present, maintaining charge uniformity while completing image data transmission within the synchronized 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
This approach reduces or eliminates display defects like waterfall defects by ensuring all pixels charge voltage uniformly during the light source's ON period, decreasing power consumption and minimizing voltage drops due to light leakage currents.
Implementation Method 1
The backlight assembly includes a plurality of light emitting diodes
Implementation Method 2
The LCD panel displays images using a selectively changeable light transmittance characteristic of liquid crystal
Data Source
AI summary
A display apparatus includes a display panel including a plurality of pixels, wherein each of the pixels includes a switching element connected to a data line and a gate line, a light source configured to provide the display panel with a light, a light source driver configured to turn the light source on and off, and a panel driver configured to output a data voltage to the data lines and a gate signal to the gate lines during an ON period in which the light source turns on the light, and to block the data voltage to be applied to the data lines and the gate signal to be applied to the gate lines during an OFF period in which the light source turns off the light.