JPS61224687A - Videotex terminal equipment - Google Patents

Abstract

PURPOSE:To make characters and graphic forms visible by providing a function executing rewrite processing of contents in a video RAM, where semi-brightness display information is stored, to total brightness information through user's operation of an operable switch. CONSTITUTION:One logical picture element 4 of display information transmitted through a videotex communication network is magnified into an area 6 of four pixels on a display plane, and a character pattern is displayed at semi brightness. Through a key input a processor reads out display information of one byte (8 bits) unit from each display plane and writes it on a register 8, where semi-brightness data is set as figure (a) shows. A CPU shifts said data to a left side by one bit, and writes it on a register 9. Then an ALU adds contents in the registers 8 and 9, and stores the added result in the register 8. Said operations are executed at every plane. As a result, the semi-brightness data is converted into the total brightness data, which is displayed in accordance with the key input.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a Videotex terminal equipment aK, in particular a display device that displays image information including half-brightness color, which inherently has a half-brightness display capability. It relates to a display processing device that does not.

[Conventional technology]

Conventionally, in Videotex terminal equipment, as a method for displaying each half-brightness color in addition to N colors on a display device that only has the display capability of N colors, one logical dot of display information is placed on the display surface. A method (tiling method) was used in which multiple dots (pixels) were used, with half of the pixels being bright spots and the remaining half being dark spots.

[Problem that the invention seeks to solve]

With the above-mentioned tiling method, if the display button is thin, the apparent width of the continuous linear button may appear different from the display information, or the button may appear cut off. Especially when displaying small characters, it may be difficult to read. There were times when it wasn't.

[Means for solving problems]

The Videotex terminal device of the present invention allows a user to execute a process of converting the contents of a video RAM in which half-brightness display information is stored into full-brightness information by operating a key switch that can be operated by the user.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of the device, in which the processing device 1 can redraw all the image information displayed on the display device 3 in full brightness color by the user's operation of the keyboard 2 (by means described later). . FIG. 3 shows the structure of the display memory (video RAM).

B has three display planes, each with a first plane,
They are called the second plane and the third plane. The display color is determined by the content on the same address of each brane.

FIG. 4 is an excerpt of one of the brains shown in FIG. Half brightness data is set in the register 8 as shown in FIG. 5(a). CPUa shifts this one bit to the left and writes it to register 9. Then, the contents of register 8 and register 9 are added by the ALU and the result is stored in register 8. In other words, if 1 byte of data read from the display plane is d, then d and binary pattern 01
If the bit product with 010101 is d', and the data after conversion to full brightness is f, then f=d'V (d' X 2 ). However, ■The logical sum for each L bit, d/x2, is d'
This shows an operation for shifting 1 bit to the left. This transformation is applied to locations where the rask number of the display device is odd, and where the rask number is even, d and the binary pattern 101010
Apply f:d″V(d″/2) with the bit ridge with 10 as d″.

However, d''/2 can be calculated by shifting d'' by 1 bit to the right.

The above operations are executed for each brane. As a result, when the CPLI performs the register operations described above in response to key input, half-brightness data can be converted to full-brightness data and displayed.

FIG. 6 is a diagram showing the processing flow.

〔Effect of the invention〕

FIG. 2 shows the correspondence of display dots, where 4 is one logical pixel of display information transmitted via the Videotex communication network, which is expanded to a 4-pixel area corresponding to 5 on the display screen. The state of each pixel on a display device displaying the character pattern shown in FIG. 2A at half brightness is as shown in FIG. According to the present invention, when a clear pattern appears in such a half-brightness display, it is possible to make characters and figures easier to see by manually increasing the brightness to full brightness.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an apparatus configuration according to an embodiment of the present invention, and FIG.
The figure shows a display example using the tiling method, Figure 3 is a configuration diagram of the image storage circuit in the device configuration of the embodiment, Figure 4 is an explanatory diagram showing the processing unit of redrawing with full brightness, and Figure 5 The figure is a state diagram of changing the total brightness, and FIG. 6 is a flowchart of the full brightness re-extracting process. 1...Processing device, 2...Key switch, 3...Display device, 4...Logic pixel, 5...Logic pixel Display area corresponding to 6...
...Minimum display unit (pixel), 7...Display frame, 8,9...Register. 1++ 1 7-+, 4-
, /, -~. Figure / Figure 2, Figure 3, Figure 4, Figure 6

Claims (1)

[Claims] 1. A Videotex terminal device comprising a function of converting half-brightness display data of an image storage circuit into full-brightness display data in response to a key operation from a user.