Display Device Frame Rate Adjustment and Pixel Discharge Reduction
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Solution Overview
Problem
The increasing resolution of flat panel displays leads to higher power consumption due to the need for more gate and data signals, which is not effectively addressed by existing technologies, resulting in increased power usage and potential visual defects like flicker and line dim.
Innovation Solution
A display device with a semiconductor metal oxide thin film transistor, passivation layers, and an optical alignment layer, along with a liquid crystal layer, that selectively adjusts the frame rate based on image data type (moving or still images) to reduce power consumption while minimizing visual defects, using a method that includes forming a thin film transistor on a substrate, applying passivation and insulation layers, and configuring electrodes to generate electric fields within the liquid crystal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display panel is increased to provide clearer picture quality, then the picture quality is improved, but the power consumption increases due to extra gate and data lines
Solution Approach 1:
The patent applies periodic action by implementing variable refresh rate technology that dynamically adjusts the frame rate based on image content characteristics. For still images, the refresh rate is reduced to save power, while for moving images, the refresh rate is increased to maintain picture quality. This periodic adjustment resolves the contradiction by making power consumption adaptive rather than constant.
2Use of energy by moving object
If the frame rate is reduced to lower power consumption, then power consumption is reduced, but visual defects such as flicker and line dim occur
Solution Approach 1:
The patent applies dynamics by implementing a dynamic frame rate adjustment mechanism that adapts the refresh rate based on real-time analysis of image content. The system dynamically switches between high and low refresh rates depending on whether the displayed content is static or moving, thereby resolving the contradiction between power savings and visual quality by making the frame rate flexible rather than fixed.
Solution Approach 2:
The patent applies parameter changes by modifying the refresh rate parameter based on image content characteristics. The system changes this critical display parameter dynamically - using lower refresh rates for still images to reduce power consumption and higher refresh rates for moving images to prevent visual defects, thus resolving the contradiction through parameter adaptation.
3Use of energy by moving object
If the frame rate is selectively adjusted to reduce power consumption, then power consumption is reduced, but image quality may deteriorate due to reduced refresh rate
Solution Approach 1:
The patent applies local quality by implementing content-aware frame rate adjustment that treats different types of image content differently. The system analyzes local characteristics of the displayed content and applies appropriate refresh rates - lower rates for static regions and higher rates for dynamic regions - thereby resolving the contradiction by applying quality optimization locally rather than globally.
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 reduces power consumption by selectively adjusting the frame rate with minimal visual defects, such as flicker, by using a semiconductor metal oxide thin film transistor and passivation layers, allowing for efficient operation at lower frame rates with reduced pixel discharge and improved brightness stability.
Implementation Method 1
a common electrode and a pixel electrode that are positioned on the organic insulation layer and apply a horizontal electric field to a liquid crystal layer
Implementation Method 2
the liquid crystal layer positioned on the lower optical alignment layer
Data Source
AI summary
A display device optimized to operate in a low frame rate mode under certain predetermined conditions is provided. To reduce pixel discharge during the low frame rate mode, the display device employees the TFTs with metal oxide semiconductor layer, the optical alignment layer with an upper portion and a lower portion having different resistivity. In addition, a passivation layer is provided between the optical alignment layer and the pixel or the common electrode for compensating the low resistivity of the lower portion of the optical alignment layer. As such, various visual defects associated with the pixel discharge can be reduced even when the display device is operating under the low frame rate mode.