Display Driving Controller with Dual Repair Blocks for Defective Pixels
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Solution Overview
Problem
Defective pixels during the manufacturing process of display apparatuses lead to reduced yield and performance issues.
Innovation Solution
Incorporation of a first and second repair pixel block, each generating repair driving currents based on specific data voltages, controlled by a driving controller that determines pixel location and adjusts signals to drive defective pixels effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If repair pixel blocks are introduced to drive defective pixels, then the yield of the display apparatus is improved, but the device complexity increases
Solution Approach 1:
The display panel is segmented into functional regions including a first repair pixel block and a second repair pixel block, each serving specific defective pixels. This segmentation allows targeted repair functionality without requiring complete system redesign, thereby improving yield while managing complexity through modular organization.
Solution Approach 2:
The repair pixel blocks are designed with multi-functionality to drive different types of defective pixels (e.g., red, green, blue sub-pixels) using a unified control mechanism. The driving controller and data driver are configured to universally handle both normal pixels and defective pixels through the repair mechanism, reducing the need for separate specialized components.
2Reliability
If location determining and signal adjusting mechanisms are added, then the reliability of defective pixel driving is improved, but the device complexity increases
Solution Approach 1:
The driving controller incorporates a location determining block that identifies defective pixel positions and a data selecting block that adjusts drive signals based on this location information. This feedback mechanism ensures reliable driving of defective pixels by dynamically adapting control signals to the specific defect characteristics and location, thereby improving reliability through intelligent control rather than additional hardware complexity.
Solution Approach 2:
The system changes operational parameters (drive current, data voltage) based on the determined location and type of defective pixel. The offset calculating block and amplifier compensating data outputting block adjust signal parameters dynamically to match the specific requirements of different pixel types and defect severities, achieving reliable driving through parameter optimization rather than structural complexity.
Data Source
AI summary
A display apparatus comprises a display panel including a first repair pixel block, a second repair pixel block and a plurality of pixels, a gate driver configured to output a gate signal to the display panel, a data driver configured to apply a data voltage based on a data signal to the display panel, and a driving controller configured to control the gate driver and the data driver and output the data signal based on input image data. Either the first repair pixel block or the second repair pixel block may apply a repair driving current to at least one pixel among the plurality of pixels based on the data signal and a location of the at least one pixel.