Display Apparatus Detection Signal Line for Drive Voltage Deviation
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Solution Overview
Problem
In high-resolution display apparatuses, output deviations in drive voltage signals from signal generation circuits lead to variations in pixel luminance, degrading image quality, and pose challenges in detecting these deviations due to the complex connection of signal lines on printed wiring boards.
Innovation Solution
A display apparatus with a signal line selection unit that divides signal lines into groups for sequential selection and a digital signal processing section to convert digital video signals, allowing for detection of output deviations through a dedicated detection signal line and switches, enabling correction of drive voltage signals on a wiring board with parallel signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the number of signal lines is increased to transmit drive voltage signals to all pixels simultaneously, then the transmission speed and image quality are improved, but the device complexity and system cost increase
Solution Approach 1:
The patent divides the display panel into multiple pixel blocks and implements block sequential driving, where drive voltage signals are transmitted to different pixel blocks in sequential time slots using the same signal lines. This segmentation approach allows full HD resolution to be achieved without requiring a proportional increase in the number of signal lines, as signals are multiplexed across time rather than requiring dedicated lines for each pixel
Solution Approach 2:
The patent employs periodic time-division multiplexing where signal lines are sequentially allocated to different pixel blocks in periodic time slots. The signal generation circuit generates drive voltage signals that are transmitted in a periodic sequence to different pixel blocks, enabling efficient use of limited signal lines while maintaining high-resolution display capability
2Device complexity
If block sequential driving method is used to reduce the number of signal lines, then the device complexity is reduced, but the signal transmission speed decreases
Solution Approach 1:
The patent changes the timing parameters of signal transmission by optimizing the time slot allocation for different pixel blocks. The signal generation circuit is designed to generate and transmit drive voltage signals with optimized timing characteristics, ensuring that despite the sequential transmission method, the overall frame rate and refresh speed meet full HD display requirements
3Measurement precision
If the number of pixels is increased to achieve high resolution, then the image quality is improved, but the number of signal lines required increases
Solution Approach 1:
The display panel is segmented into multiple pixel blocks that can be driven independently in sequential time slots. This allows high-resolution displays with thousands of pixels to be driven using a manageable number of signal lines, as the segmentation enables time-division multiplexing of the signal transmission path
Solution Approach 2:
The signal lines are designed to serve multiple functions by being sequentially allocated to different pixel blocks. The same physical signal lines perform the function of driving multiple different pixel blocks at different time periods, reducing the total number of signal lines required for high-resolution displays
Data Source
AI summary
A display apparatus includes a DSD for outputting a digital video signal and a wiring board. The wiring board includes a first wiring portion in which signal lines used to transmit the digital video signal output from the DSD are disposed, a signal generation circuit for generating drive voltage signals, and a second wiring portion in which signal lines used to transmit the drive voltage signals to a panel substrate are disposed. In the first wiring portion, a detection signal line used to transmit the drive voltage signals to the DSD is disposed. In the signal generation circuit, an output wiring portion including output lines used to transmit the drive voltage signals to the signal lines in the second wiring portion and a detection line having one end connected to the detection signal line and the other end connected to the output lines via switches are disposed.