Display Timing Controller Frequency Grayscale Switching
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Solution Overview
Problem
The increasing power consumption in mobile devices with enhanced capabilities limits the performance of liquid crystal display (LCD) systems, as they require higher driving frequencies to maintain image quality, leading to increased energy usage.
Innovation Solution
A display apparatus with a timing controller that switches between two operation modes: a high-frequency mode for displaying images with a larger number of grayscales and a low-frequency mode for reduced power consumption, using a frame masking driving scheme to block certain image frames and adjust driving frequencies accordingly, while utilizing an image divider, analyzer, and converter to determine representative grayscales for reduced image quality in low power mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel operates at a high driving frequency to maintain image quality with multiple grayscales, then the image quality is improved, but the power consumption increases
Solution Approach 1:
The display apparatus dynamically switches between first and second operation modes based on power consumption requirements. In the first mode, the display panel operates at a first frequency with X grayscales for high image quality. In the second mode, it operates at a second frequency (lower than the first) with Y grayscales (fewer than X) for reduced power consumption. The timing controller adjusts the driving frequency and grayscale levels dynamically to balance image quality and power consumption.
Solution Approach 2:
The invention changes the operating parameters of the display panel by adjusting the driving frequency and the number of grayscale levels. When transitioning from the first operation mode to the second operation mode, the driving frequency is reduced from the first frequency to the second frequency, and the grayscale levels are reduced from X to Y. This parameter adjustment allows the display to consume less power while maintaining acceptable image quality for static or low-motion content.
2Manufacturing precision
If the display panel uses a larger number of grayscales to represent images, then the image quality is improved, but the power consumption increases
Solution Approach 1:
The display apparatus dynamically adjusts the number of grayscale levels based on the operation mode. In the first operation mode, the display panel uses X grayscales to represent images, providing high image quality. In the second operation mode, it uses Y grayscales (where Y < X) to reduce power consumption. The timing controller manages this dynamic adjustment by converting input image data into second output image data that uses fewer grayscale levels when operating in power-saving mode.
3Use of energy by moving object
If the display panel operates at a lower driving frequency to reduce power consumption, then the power consumption is reduced, but the image quality may deteriorate
Solution Approach 1:
The invention applies partial action by using fewer grayscale levels (Y grayscales instead of X grayscales) when operating in the second operation mode. This partial reduction in grayscale precision is sufficient to achieve the goal of reducing power consumption while maintaining acceptable image quality for many practical applications. The frame masking driving scheme also blocks certain image frames to further reduce power consumption, accepting that some temporal detail may be lost.
Solution Approach 2:
The invention employs frame masking driving where every second frame of input image data is blocked from display in the second operation mode. This periodic blocking of frames reduces the effective driving frequency and power consumption. The timing controller implements this by selectively disabling the display of alternating frames, creating a periodic pattern that reduces overall energy usage while maintaining acceptable visual quality for static or slowly changing images.
Data Source
AI summary
A display apparatus includes a display panel and a timing controller. The timing controller generates first output image data based on input image data and sets a driving frequency of the display panel as a first frequency in a first operation mode. The timing controller converts the input image data into second output image data and sets the driving frequency of the display panel as a second frequency lower than the first frequency in a second operation mode. The display panel displays a first image based on the first frequency and the first output image data in the first operation mode. The first image is represented by X grayscales. The display panel displays a second image based on the second frequency and the second output image data in the second operation mode. The second image is represented by Y grayscales, where Y is less than X.