Display Panel Region DCC Gain Synchronization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid Crystal Display (LCD) panels experience residual images and double images due to the slow response speed of liquid crystals, which existing Dynamic Capacitance Compensation (DCC) and backlight-on/off methods fail to fully address, especially when backlight-on/off timing is not synchronized with scanning timing, particularly in displays without individual backlight control.
Innovation Solution
A display apparatus and control method that divide the display panel into regions and apply different Dynamic Capacitance Compensation (DCC) gain values based on the scanning timing and backlight-on/off timing, using a pre-stored look-up table to synchronize and compensate image data output, ensuring proper synchronization even without individual backlight control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If global backlight-on/off method is used, then device complexity is reduced, but residual images and double images occur due to inability to synchronize backlight timing with scanning timing for each region
Solution Approach 1:
The display panel is divided into multiple regions (e.g., upper, middle, lower regions), and each region is assigned a different DCC gain value based on its scanning timing relative to the backlight-on timing. This segmentation allows region-specific compensation without requiring individual backlight control for each region, thus maintaining low device complexity while improving display quality.
Solution Approach 2:
Different DCC gain values are applied to different regions of the display panel according to their specific scanning timing characteristics. Regions with later scanning timing receive higher DCC gain values to compensate for the longer delay between backlight-on and data scanning, while regions with earlier scanning timing receive lower gain values. This local quality approach resolves the contradiction by providing region-adaptive compensation without increasing backlight control complexity.
2Speed
If DCC gain value is increased to speed up liquid crystal response, then response speed is improved, but residual images occur due to over-compensation and mixing of frame data
Solution Approach 1:
The DCC gain value is dynamically adjusted based on the scanning timing of each region. By changing the DCC parameter (gain value) according to the specific timing characteristics of each region, the system achieves optimal liquid crystal response speed without over-compensation. Regions with later scanning timing use higher gain values to accelerate response, while regions with earlier scanning timing use lower gain values to prevent over-compensation and residual image formation.
3Reliability
If backlight-on timing is synchronized with scanning timing for each region, then residual images are removed, but device complexity increases due to need for individual region control
Solution Approach 1:
The DCC (Dynamic Capacitance Compensation) mechanism serves as an intermediary that compensates for the timing mismatch between backlight-on and scanning operations. Instead of directly controlling backlights for each region, the system uses DCC to adjust the liquid crystal response characteristics, effectively synchronizing the display output without requiring complex regional backlight control.
4Illumination intensity
If backlight is turned on early to ensure full screen illumination, then illumination intensity is improved, but double images occur in upper and lower regions due to timing mismatch with scanning
Solution Approach 1:
The system dynamically adjusts the DCC gain value for each region based on its scanning timing relative to the backlight-on timing. This dynamic adjustment allows the system to maintain proper image quality despite the fixed early backlight-on timing, by compensating for the timing mismatch in each region individually through parameter adaptation.
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
Effectively removes residual and double images by adjusting DCC gain values for each region, improving liquid crystal response speed and synchronizing backlight timing with scanning timing, thereby enhancing display clarity and reducing motion blur.
Implementation Method 1
The liquid crystal panel drives the liquid crystal by forming an electric field by supplying a driving voltage from the driver, and adjusting transmittance of the light supplied from the backlight
Implementation Method 2
The DCC method is based on the characteristic of the liquid crystal that a state of the liquid crystal changes quickly with a greater difference between a voltage which is currently applied to the liquid crystal and a voltage which is newly applied
Data Source
AI summary
A display apparatus and a control method thereof are provided. The method includes receiving image data, processing the image data, and dividing a display panel into a plurality of regions, synchronizing a scanning timing of the image data at which the processed image data is scanned in a first region among the plurality of regions with a backlight-on timing of the display panel, and outputting the processed image data in the display panel. The outputting the processed image data includes compensating and outputting the processed image data according to a relation between a scanning timing of the image data for each region of the plurality of regions of the display panel and the synchronized backlight-on timing.