Video Display Device Vertical Blanking Reduction
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Solution Overview
Problem
Conventional organic EL display devices experience display unevenness synchronized with the frame period, particularly in large display units driven at high current, due to variations in drive current caused by vertical blanking periods.
Innovation Solution
A video display device with a display unit arranged in a matrix, a video obtaining unit, a video format conversion unit that converts the video format to reduce vertical blanking rows, and a display driver unit that displays video row by row at a horizontal scanning frequency, maintaining equal frame frequency and reducing vertical blanking rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional video format with vertical blanking period is used for driving the display unit, then the display can be operated at high current for large display units, but display unevenness occurs in synchronization with the frame period
Solution Approach 1:
The patent changes the video format parameters by reducing the number of vertical blanking rows from q1 to q2. This parameter modification alters the timing characteristics of the video signal, thereby changing the drive current waveform to reduce its variation amplitude while maintaining the same frame frequency and display resolution
Solution Approach 2:
The patent utilizes periodic modulation of the drive current by adjusting the vertical blanking period timing. By optimizing the periodic structure of the video signal (reducing q2), the drive current variations become more regular and less pronounced, suppressing display unevenness while maintaining continuous operation
2Manufacturing precision
If the number of vertical blanking rows is reduced in the video format, then variations in drive current are reduced, but the video format conversion complexity increases
Solution Approach 1:
The patent applies parameter change by modifying only the vertical blanking row count (q1 to q2) while preserving other critical video format parameters such as frame frequency, horizontal blanking columns, and active pixel dimensions. This selective parameter modification achieves display uniformity improvement with minimal conversion complexity
Solution Approach 2:
The video format conversion unit is designed to handle multiple video format conversions by implementing a universal conversion mechanism that can adapt to different input formats and adjust the vertical blanking rows accordingly, making the system versatile for various display scenarios
Data Source
AI summary
A video display device includes a video obtaining unit that obtains a video represented in an input video format for displaying, at a predetermined frame frequency, frames each including an effective pixel region having n rows and m columns, p1 columns of a horizontal blanking period, and q1 rows of a vertical blanking period; a video format conversion unit that converts a format of the video to an output video format for displaying, at the predetermined frame frequency, frames each including the effective pixel region having n rows and m columns, p2 columns of the horizontal blanking period, and q2 rows of the vertical blanking period, where q2 is less than q1; and a display driver unit that displays the video row by row in a display unit at a horizontal scanning frequency in the output video format.