On-screen display apparatus and on-screen display method
First Claim
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1. An on-screen display apparatus, comprising:
- a memory means for storing font data including face data and a blank portion for each character in the font data;
a counter for counting synchronizing signals corresponding to a number of scanning lines in a character to be displayed;
a detection means for detecting a number of scanning lines in one screen from an input signal; and
a vertical dot count control means for determining a vertical dot number of the character to be displayed from said memory means in accordance with the number of scanning lines detected by said detection means, said vertical dot count control means outputting to said counter a signal which controls the number of scanning lines to be counted by said counter,wherein the character having the vertical dot number of said blank portion adjusted in accordance with the number of scanning lines counted by said counter are outputted from said memory means.
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Abstract
In an on screen display apparatus and an on-screen display method, the number of scanning lines of an input signal is detected. In accordance with the result of the detection, a vertical dot number of a character to be displayed is determined and font data is read from a memory device after adjusting a dot number of a blank portion of the font data. Hence, even if the number of the scanning lines changes, the number and positions of characters displayed in one screen remain constant.
24 Citations
9 Claims
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1. An on-screen display apparatus, comprising:
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a memory means for storing font data including face data and a blank portion for each character in the font data; a counter for counting synchronizing signals corresponding to a number of scanning lines in a character to be displayed; a detection means for detecting a number of scanning lines in one screen from an input signal; and a vertical dot count control means for determining a vertical dot number of the character to be displayed from said memory means in accordance with the number of scanning lines detected by said detection means, said vertical dot count control means outputting to said counter a signal which controls the number of scanning lines to be counted by said counter, wherein the character having the vertical dot number of said blank portion adjusted in accordance with the number of scanning lines counted by said counter are outputted from said memory means. - View Dependent Claims (2, 3, 4, 5)
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6. An on-screen display method, comprising the steps of:
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detecting a number of scanning lines in an input signal; determining a vertical dot number of a character to be displayed in accordance with the detected number of scanning lines; counting synchronizing signal corresponding to a number of scanning lines of the character to be displayed in accordance with the determined vertical dot number; and outputting font data selected from a memory which stores a plurality of the font data including face data and a blank portion of characters after adjusting a vertical dot number of said blank portion in accordance with the number of scanning lines to be counted by a counter. - View Dependent Claims (7, 8, 9)
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Specification