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Matrix type image display apparatus using non-interlace scanning system
| Details |
Inventors: Someya, Ryuuichi; Kabuto, Nobuaki; Kimura, Yuichiro; Watanabe, Kazuhiro;
Assignee: Hitachi, Ltd. (Tokyo, JP); Hitachi Automotive Engineering Company (Tokyo, JP)
Primary Examiner: Kostak; Victor R.
Assistant Examiner:
Attorney, Agent or Firm: Fay, Sharpe, Beall, Fagan, Minnich & McKee
Double line sequential scanning is performed on a display apparatus which displays, for example, a television signal and a character and graphics signal. When only a television signal is to be displayed, priority is given to the resolution of the image. When a character an graphics signal is to be displayed superimposed on the television signal, double line sequential non-interlace scanning is performed by force. In this manner, the problem of sticking or ghosting of the character and graphic images is reduced. |
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DETAILED DESCRIPTION One object of the present invention is to provide a display apparatus, perferably a liquid crystal display apparatus, which is capable of superimposing a plurality of signals on different scanning system.
For example, a TV signal on an interlace scanning system and a character and graphic signal on a non-interlace scanning system are superimposed without deteriorating the quality of the image picture.
To achieve this object, the display apparatus performs double line sequential interlace scanning when only a TV signal is displayed to attain a high resolution.
Double line sequential non-interlace scanning is performed by force when a character and graphic signal is superimposed on a TV signal to reduce sticking of the character and graphic signal.
When a mixed signal obtained by adding a TV signal and a character and graphic signal together is displayed as a superimposed display, a non-interlace display system is switch-selected by force.
Although the resolution of the picture image of the TV signal is deteriorated to a certain degree, the sticking of the character and graphic signal can be reduced.
The above mentioned double line sequential scanning system can be practiced, for example, by storing the same video signal for one horizontal scanning period temporarily in two line memories (sample-and-hold currents).
Each memory is read sequentially so that two lines are driven one by one.
In the present invention, in consideration of possible differences occurring in the video signals to be applied to adjacent two lines on account of irregularity in the arrangement of color filters or positions of pixels, the video signals input to the respective line memories are arranged to be independent of each other.
When a TV signal is to be displayed, the independently provided line memories are supplied with the signal of the same horizontal scanning at all times so that interlace driving is maintained.
When a display signal for such data as characters and graphics is to be displayed, the signal of the same horizontal scanning is supplied to the input sides of the line memories in the first field
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