Display Panel Dummy Pixel Compensation Circuit
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Solution Overview
Problem
Display panels require additional dummy pixels to account for defective pixels, leading to increased dead space and manufacturing costs, as existing technologies cannot efficiently compensate for defects across different data lines using a single dummy pixel column.
Innovation Solution
Incorporating a distributor and switching circuit that buffers and selectively provides data signals to a dummy pixel column, allowing for the compensation of defective pixels across different data lines using only one dummy pixel column, thereby minimizing the dead space occupied by dummy pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple dummy pixel columns are provided for each data line to compensate for defective pixels, then the reliability of pixel compensation is improved, but the area of dead space increases
Solution Approach 1:
A single dummy pixel column is designed to compensate for defective pixels across multiple data lines (first, second, and third data lines) by sequentially receiving data signals from different output lines. The dummy pixel column performs multiple compensation functions that would traditionally require separate dummy pixel columns for each data line, thereby reducing dead space while maintaining comprehensive pixel defect coverage.
Solution Approach 2:
The dummy pixel column dynamically switches between compensating for different data lines based on control signals. The pixel defect compensation circuit selectively connects the dummy pixel column to different output lines at different times, allowing one dummy pixel column to adaptively serve multiple data lines instead of requiring static, dedicated dummy pixels for each line.
2Area of stationary object
If a single dummy pixel column is used to compensate for defective pixels on different data lines, then the dead space is minimized, but the device complexity increases
Solution Approach 1:
A pixel defect compensation circuit is introduced as an intermediary component that manages the connection between multiple output lines and the single dummy pixel column. This circuit receives data signals from different output lines, selects the appropriate signal based on control inputs, and routes it to the dummy pixel column, thereby enabling multi-line compensation through a single column without requiring complex direct connections between all components.
Solution Approach 2:
The system employs periodic switching of data signals to the dummy pixel column based on control signals that correspond to different time periods. During first, second, and third periods, different data signals from different output lines are sequentially provided to the dummy pixel column, allowing time-multiplexed compensation for multiple data lines using a single dummy pixel column.
Data Source
AI summary
A display panel includes a displaying area including pixels, a non-displaying area including a dummy pixel, and a switching circuit to transfer a data signal to the dummy pixel in response to a control signal. The display panel may compensate for defective pixels located in different data lines using only one dummy pixel column and may minimize an area (e.g., a dead space) including the dummy pixel column by including a distributor buffering a signal of an output line and a switching circuit selecting/providing a portion of a signal of the output line to a dummy data line.