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On-screen display device

A screen display and screen technology, applied to static indicators, cathode ray tube indicators, televisions, etc., can solve the problem of increasing the video RAM200 area

Inactive Publication Date: 2004-08-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, in the above-mentioned conventional structure, when the types of characters that can be displayed are increased, if the number of digits of the character code must be increased, the area of ​​the video RAM 200 that holds the character code increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Below, refer to figure 1 , figure 2 and Figure 7 A screen display device according to Embodiment 1 of the present invention will be described.

[0038] figure 1 is a diagram showing the structure of the screen display device of the first embodiment. It should be pointed out that in figure 1 In, about with Figure 6 The same or corresponding constituent elements are denoted by the same symbols, and explanations thereof are omitted.

[0039]600 is a flag holding unit, which holds an area specifying flag indicating an area required for address conversion of the character generator ROM 400 .

[0040] figure 2 It is a diagram showing the address conversion of the character generator ROM 400 of the screen display device of the first embodiment.

[0041] The address conversion of the character generator ROM 400 includes a common area 1 storing font data from character 1 to character n, an area 2 storing font data from character n+1 to character m, and an area stor...

Embodiment 2

[0056] Below, refer to image 3 , Figure 4 A screen display device according to Embodiment 2 of the present invention will be described.

[0057] image 3 It is a diagram showing the structure of the screen display device of the second embodiment. It should be pointed out that in image 3 in, for with figure 1 The same or equivalent constituent elements are denoted by the same symbols, and their descriptions are omitted.

[0058] Figure 4 Address conversion of the video RAM 200 of the screen display device of the second embodiment is shown.

[0059] The video RAM address conversion stores an address indicating a display position on the display, character data of each displayed character, and a row attribute code. It should be noted that each attribute code includes an area designation mark.

[0060] Specifically, in the case of a character displayed on the first line, the line attribute code of the first line and the character data of the first to 24th characters of...

Embodiment 3

[0076] Below, refer to figure 2 , image 3 and Figure 7 A screen display device according to Embodiment 3 of the present invention will be described. It should be noted that, in this embodiment 3, as a diagram showing the structure of the screen display device, refer to the above-mentioned embodiment 2. image 3 , as the address conversion of the character generator ROM400, refer to the figure 2 , as the address conversion of the video RAM200, refer to the conventional example used Figure 7 , a detailed description is omitted.

[0077] Next, the operation of the screen display device of the third embodiment will be described.

[0078] First, in the display character setting unit 100 , the character data and attribute codes of characters to be displayed on the display are written in the video RAM 200 .

[0079] Then, the display control unit 300 reads out the character data written in the video RAM 200 at predetermined timings.

[0080]When the character code include...

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PUM

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Abstract

Provided is an on-screen display apparatus capable of increasing the kinds of displayable characters without increasing video RAM areas. The on-screen display apparatus includes: a character generator ROM 400 having n (n is an integer of 3 or over) sets of areas; a flag storage section 600 for outputting an area designation flag for designating a desired number of desired areas among the n-sets of the areas of the character generator ROM 400; a display character setting section 100 for writing a desired character code to a prescribed address on a video RAM 200; and a display control section 300 for reading the character code from the video RAM 200, reading font data corresponding to the read character code from an area denoted from an area designation flag outputted from the flat storage section 600 among the areas of the character generator ROM 400, and using the font data to output an on-screen output signal.

Description

technical field [0001] The invention relates to a screen display device capable of displaying characters. Background technique [0002] On a TV or a VTR, an on-screen display is used to display information on a TV screen indicating equipment status such as channels and recording reservations. [0003] First, refer to Figure 6 to describe the screen display device. Figure 6 It is a figure showing the structure of a conventional screen display device. [0004] exist Figure 6 Among them, 100 is a display character setting unit, which writes the character data composed of the character code of the required display character and the attribute code representing the color and background of the display character to a given position of the video RAM200. [0005] 200 is a video RAM, which has addresses corresponding to display positions of display characters on the display. Figure 7 It shows the address conversion of the video RAM 200 , and the characters that can be displayed o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/445
CPCG09G5/225G09G5/222H04N5/44504
Inventor 丸冈智彦田中启介
Owner PANASONIC CORP
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