Scanning Line Driving Circuit Black Insertion Blurring
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Solution Overview
Problem
Hold-type electro-optical devices, such as active matrix liquid crystal devices, experience a moving picture blurring effect due to memory of image data from previous frames, whereas impulse-type devices like CRTs do not, leading to increased circuit area requirements when attempting to implement black insertion techniques to mitigate this issue.
Innovation Solution
The use of a single vertical shift register for both image data writing and black insertion writing, with a scanning line driving circuit that includes a shift register and logic circuits to manage scanning signals and polarity changes, allowing for efficient image data and black insertion operations without enlarging the circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If two shift registers are used for image data writing and black insertion writing, then the moving picture blurring feeling is suppressed, but the circuit area becomes large
Solution Approach 1:
The patent applies multi-functionality by enabling a single vertical shift register to perform both image data writing and black insertion writing functions. The shift register alternates between these two functions in different time periods, eliminating the need for separate shift registers and thereby reducing circuit area while maintaining the ability to suppress moving picture blurring
Solution Approach 2:
The patent implements periodic action by dividing the frame period into alternating intervals: one period for image data writing and another period for black insertion writing. This time-division multiplexing allows a single shift register to sequentially perform both functions, achieving the blurring suppression effect without requiring duplicate circuitry
Data Source
AI summary
A scanning line driving circuit includes: each stage shifts and outputs in sequence a start pulse; and logic circuits provided corresponding to the scanning lines and operating to determine the logical product of a signal outputted from the shift register of the stage corresponding to the scanning line and an enable signal supplied differently every group, the enable signal corresponding to the group becomes, in a horizontal scanning period in which the image data writing is carried out for the scanning lines belonging to the group, an active level in a horizontal effective scanning period and an inactive level in a horizontal return line period; and in a horizontal scanning period in which the image data writing is not carried out for the scanning lines belonging to the group, an inactive level in the horizontal effective scanning period and an active level in the horizontal return line period.