Display Panel Driving Frequency Adjustment for Flicker Reduction
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Solution Overview
Problem
Existing display apparatuses face challenges in reducing power consumption while maintaining display quality, particularly when displaying still images, as they may mistakenly perceive still images as video due to dithering operations, leading to flicker issues.
Innovation Solution
The display apparatus incorporates a frequency adjuster positioned before the dithering part, allowing for the setting of a low driving frequency when displaying still images, thereby reducing power consumption and preventing flicker caused by dithering operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display apparatus drives the display panel at a relatively low driving frequency to reduce power consumption, then power consumption is reduced, but the display quality deteriorates due to flicker and mistaken perception of still images as video
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the driving frequency based on image type detection. When a still image is detected, the system switches to a lower driving frequency (e.g., 1Hz or 2Hz) to reduce power consumption. When a video image is detected, the system switches to a higher driving frequency (e.g., 60Hz) to maintain display quality. This parameter adjustment resolves the contradiction by optimizing frequency selection based on actual display content.
Solution Approach 2:
The patent implements feedback through image type detection that monitors the input image characteristics and provides feedback to the frequency adjustment mechanism. The system detects whether the input image is a still image or video image and uses this information to feedback-adjust the driving frequency accordingly. This feedback loop ensures that the display apparatus maintains optimal performance while minimizing power consumption.
2Manufacturing precision
If the dithering part performs dithering operation to increase grayscale resolution, then display quality improves, but flicker is generated causing still images to be mistaken for video images
Solution Approach 1:
The patent resolves this contradiction by changing the driving frequency parameter based on the presence of dithering operations. When dithering is detected, the system increases the driving frequency to prevent flicker. When dithering is not present, the system uses a lower driving frequency to save power. This dynamic parameter adjustment allows the system to maintain grayscale resolution improvement from dithering while preventing the harmful flicker effect.
3Ease of manufacture
If the frequency adjuster is positioned after the dithering part, then dithering can be performed first, but flicker occurs because the frequency adjustment cannot prevent the dithering-induced flicker
Solution Approach 1:
The patent applies preliminary action by positioning the frequency adjuster before the dithering part in the signal processing chain. This allows the frequency adjustment to be performed in advance, setting the appropriate driving frequency before dithering operations begin. By performing this preliminary frequency adjustment, the system prevents flicker from occurring in the first place, rather than attempting to correct it after the fact.
Solution Approach 2:
The patent implements preliminary anti-action by using the frequency adjuster to preemptively counteract the potential flicker effect before dithering operations generate it. By detecting the presence of dithering and adjusting the frequency in advance, the system creates a protective mechanism that prevents the harmful flicker effect rather than allowing it to manifest and then attempting to correct it.
Data Source
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AI summary
A display apparatus includes a display panel (100), a data driver (500) and a driving controller (200). The display panel (100) is configured to display an image based on input image data. The data driver (500) is configured to output a data voltage to the display panel (100). The driving controller (200) includes a frequency adjuster circuit configured to determine a driving frequency of the display panel (100), and a dithering circuit configured to change a grayscale value of at least one pixel of the input image data according to frames. The frequency adjuster circuit is configured to determine the driving frequency of the display panel (100) based on the input image data and based on whether the dithering part is activated.