Data Driver with Variable Driving Capabilities for Display Panel Uniformity
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Solution Overview
Problem
Display panels often exhibit inconsistent image display at opposite ends due to color differences, resulting in poor image performance, as data voltages with varying driving capabilities are not effectively supplied to pixels at different distances from the data driver.
Innovation Solution
A data driver with multiple data outputs, each providing data voltages with distinct driving capabilities to pixels at varying distances, ensuring uniform data voltage distribution across the display panel by compensating for the effects of RC circuits, thereby maintaining consistent image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single data output supplies data voltages to all pixels, then the device complexity is reduced, but the image display consistency deteriorates due to color differences at opposite ends
Solution Approach 1:
The data driver divides the pixel array into multiple groups along the second direction, with each group receiving data voltages from a dedicated data output. This segmentation allows independent optimization of driving capabilities for different regions, resolving the contradiction between simple structure and consistent display quality.
Solution Approach 2:
Different data outputs are assigned different driving capabilities tailored to their specific regions. Data outputs closer to one end provide stronger driving capability to compensate for voltage drops, while those at the other end provide weaker driving capability. This local customization ensures uniform image display across the entire panel.
2Reliability
If data voltages with strong driving capability are supplied to all pixels, then the pixels at far distances can be driven adequately, but the pixels at close distances experience over-driving and distortion
Solution Approach 1:
Each data output is configured with a driving capability matched to its specific position and load characteristics. Data outputs serving distant pixels provide stronger driving capability, while those serving nearby pixels provide weaker driving capability. This localized optimization eliminates both under-driving and over-driving conditions across the panel.
Solution Approach 2:
The patent varies the driving capability parameter of different data outputs based on their position in the array. By adjusting this parameter locally rather than uniformly, the system achieves reliable voltage delivery to distant pixels without causing distortion in nearby pixels.
Data Source
AI summary
A data driver and display panel are disclosed. The data driver is applicable to providing image data to be displayed to a plurality of data lines. The data driver includes: a data processing unit, a driving unit, and at least two sets of data outputs. The data processing unit is configured to receive and store one frame of image data to be displayed. The driving unit is to output at least two sets of data voltages having different driving capacities according to the image data. Each of the at least two sets of data outputs includes a plurality of data outputs, and each set is connected to pixels in two areas with a different distance from the data driver. The driving unit provides the at least two sets of data voltages having different driving capabilities to the at least two sets of data outputs.