JPH03175493A - Television screen display device - Google Patents

Abstract

PURPOSE:To obtain a various display mode and to improve visual impressions by varying the display color of a multiple-matrix character group gradually on a TV screen with time. CONSTITUTION:The display device uses an n-bit register 13 which input data of a data bus 2 through a CPU, an n-bit counter 14 which counts a vertical synchronizing signal determining one field at the end of the display of an image plane while the value of the n-bit register 13 is regarded as an initial value, a comparator 15 which compares the counted value of the n-bit counter with the counted value of a counter 1 using a horizontal synchronizing signal indicating one scanning line area as its count source, a display color border control circuit 16 which controls the border of a display color according to the output of the comparing circuit, and a polarity switching circuit 17 which changes the polarity of the output of the display color border control circuit. Consequently, the color of display characters can be changed with time and the diversity of the impression display mode of display characters can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screen display device for television C (hereinafter referred to as TV).

[Conventional technology]

Fig. 3 is a block diagram of the circuit configuration of a conventionally used TV screen display device, and Fig. 4 shows a TV screen obtained by Fig. 3.
It is a display function diagram showing a screen display function.

Next, the operation of the conventional circuit configuration will be explained.

First, a horizontal synchronizing signal C or less Hs indicating one scanning line area
yna signal) is sent to an n-bit up counter (1), which produces data representing all the scan line areas of the screen according to the count up. Thereafter, the output data of the n-bit up counter (1) and the value of the vertical position detection data sent from the data bus (2) via the central processing unit C (hereinafter referred to as CPU) (not shown) are converted to the vertical position detection circuit ( 3)
By sending the signal to , the position of the -scan line, that is, the vertical position of the screen is determined. In this way, once the vertical position of the screen is determined, the output data of the vertical position detection circuit (3) is sent to the oscillator circuit (4) which produces a clock signal, - a clock signal representing all horizontal positions in the scanning line; This clock signal and C
The horizontal position of the screen is determined by applying horizontal position detection data from the data bus (2) via the PU to the horizontal position detection circuit (5). After determining the vertical and horizontal positions of the screen in this way, the output data of the vertical position detection circuit (3) and the horizontal position detection circuit (5) are sent to the timing control circuit (6), so that the following Circuit, that is, screen display data memory C (hereinafter referred to as CRTRAM) (7)・Screen display character memory C (hereinafter referred to as CRTROM) (8)・
It controls the timing of sending data to the shift register (9). After this, the CRTRAM (7), which stores the designation of the type and color of characters to be displayed on the screen, is loaded with the CP according to the timing controlled by the timing control circuit (6).
Types of characters sent from data bus (2) via U
Write the data value that specifies the color. Next, the timing control circuit (6) determines which dots on the screen should be used to display the specified character type and color, that is, the timing control circuit (6) stores the dot arrangement pattern required for the character structure. While weighing the above CRTRA
By sending the output data of M (7), the ROM contents specified by this data are read out, and the output data is stored in the shift register (9) at - hours while the timing is controlled by the timing control circuit (6). This stored data and the output of the color signal selection circuit αO read out from the CRTRAM (7) are input to the two-manpower circuit 0, and the output is given to the image signal output circuit (2) for screen display. . If you want to change the display color of displayed characters, use CRT.
Rewrite data in RAM (7) Color signal selection circuit aC>
By changing the data, this can be done instantaneously as shown in FIG. When the display of the screen associated with one field scan is completed, a new screen display for the next one field scan is performed using the vertical synchronizing signal C which determines one field (interacts with V87Q6).

[Problem to be solved by the invention]

As information transmission through TV screen display becomes more functional,
As shown in Figure 3, in the conventional circuit configuration, the only way to change the display color of characters on a TV screen was to do so instantaneously. This poses a problem in that the variety of display formats does not provide a good visual impression.

This invention was made to solve the above-mentioned problems, and its object is to change the display color of a multi-column character group that can be displayed on a TV screen over time.

[Means to solve the problem]

The TV screen display device according to the present invention uses vsyna added in parallel to the character generation circuit as a count source, and C
There is an n-bit register that inputs data on the data bus via the PU, and the value of this n-bit register is set to the initial value Vsy.
An n-bit counter that counts ne, a comparison circuit that compares the count value of this n-bit counter with the count value of a counter that uses Hsyna as a count source, and a display that controls the boundaries of display colors according to the output of this comparison circuit. A color boundary control circuit and a polarity switching circuit for changing the polarity of the output of the display color boundary control circuit are provided.

[Effect]

The circuit configuration according to the present invention can gradually change the display color of a multi-column character group on a TV screen over time.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing the circuit configuration of a TV screen display device which is an embodiment of the present invention, and FIG. 2 is a display function diagram showing the TV screen display function obtained by FIG.

In Figure 1, this circuit configuration includes an n-bit register (2), an n-bit up counter α4, a polarity switching circuit α, a comparison circuit (A), and a display color boundary control circuit αθ in parallel to the conventional character generation circuit. It is configured by adding.

Therefore, the circuit configuration will be explained in detail. first,
In FIG. 1, the n-bit up counter (1) is Hs
The yna signal and the vayne signal are input, and the processed data is sent to the vertical position detection circuit (3), which is one of the conventional circuit configurations.
is output to comparison circuit 0.

n-bit register O is data bus +2 via CPU)
It inputs the data sent by and outputs the processed data to the n-bit up counter α4. The n-bit up counter α4 inputs the VaynOm number and the output data of the n-bit register O, and outputs the processed data to the comparison circuit (A). Comparison circuit (2) has n pit counter (1) and n
The output data of the bit up counter α4 is input, and the processed data is output to the display color boundary control circuit αG. The display color boundary control circuit DI3 outputs the processed data to the polarity switching circuit α. The three-man power circuit car inputs the output data of the shift register (9) and the polarity switching circuit α, which are one of the conventional circuit configurations, and outputs the processed data from the image signal output circuit υ. Get the screen display function by example. Here, the conventional circuit configuration refers to the character generation circuit (2) configured within the dotted line shown in Figure 3, including the vertical position detection circuit (3) and timing control circuit (6).
)・CRTRAM (71・CRTROM (sl) Using a shift register (9), the circuit is configured so that data moves as shown by the arrow in this figure.

Next, the operation will be explained. First, the H87D6 signal is sent to the n-bit up counter (1) in order to create data that can represent all scan line areas of the screen, ie all vertical positions. After that, the n-bit up counter (
The output data of 1) is converted into a conventional character generation circuit (
(not shown) and, in parallel, to the circuits necessary for this embodiment.

Taking a closer look at the operation of the circuit required for this embodiment, first, a data bus (2) via the CPU (not shown) is used to determine the initial value of the display color boundary, that is, the position where the display color starts to change. The data for setting is stored in the n-bit register υ. Thereafter, the data stored in the n-bit register O is given to an n-bit up counter α4 that counts up once per screen while being controlled by the V87Q6 signal.

Then, by sending the data obtained by the n-bit up counter (1) and the output data of this n-bit counter α4 to the comparison circuit (2), the boundaries of display colors are specified using all the scanning lines of the screen. By performing comparison control for the display color boundary and feeding the output to the display color boundary control circuit Qθ, a high level signal is generated in the scanning line area above the display color boundary, and a low level signal is generated in the scanning line area below the boundary. Process so that it is output. This output is input to the polarity switching circuit αη corresponding to the R, G, and B color signal output terminals, and this output and the color signal selection circuit (1 (I output) and the shift register in which the dot pattern of the character is stored ( By inputting the value of 9) into the three-person car circuit (2) and sending its output to the image signal, it becomes possible to change the display color over time as shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, there is an n-bit register that inputs data on a data bus via the CPU, an n-bit counter that counts vsyna with the value of this n-bit register as an initial value, and a comparison circuit that compares the count value with the count value of a counter using Hsyna as a count source; a display color boundary control circuit that controls the boundaries of display colors according to the output of the comparison circuit;
Since it is constructed using a polarity switching circuit that changes the polarity of the output of this display color boundary control circuit, the color of the displayed characters can be changed over time, which allows for a variety of impression display forms of the displayed characters. can be improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the circuit configuration of a TV screen display device which is an embodiment of the present invention, Fig. 2 is a display function diagram showing the TV screen display function obtained by Fig. 1, and Fig. 3 is a conventional Block diagram showing the circuit configuration of the TV screen display device, 8
FIG. 4 is a display function diagram showing the TV screen display function obtained by FIG. (1)...Counter, (2)...Data bus, (3
)...Vertical position detection circuit, (4)...Oscillation circuit, (
5)...Horizontal position detection circuit, (6)...Timing control circuit, (7)...CRTRAM, (8)...
CRTROM, (9)...Shift register, O.
... n-bit register, αru ... robit counter,
(2)... Comparison circuit, aS... Display color boundary control circuit, αη... Polarity switching circuit. In addition, the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A vertical position detection circuit that inputs data on a data bus via the CPU and processing data of an n-bit up counter controlled by a horizontal synchronization signal and a vertical synchronization signal, and an oscillation circuit that inputs processing data of this vertical position detection circuit. a horizontal position detection circuit that inputs the clock signal generated by this oscillation circuit and the output data of the vertical position detection circuit; and a timing control that inputs the processed data of this horizontal position detection circuit and the output data of the vertical position detection circuit. a screen display data memory for inputting the timing controlled by this timing control circuit and data on the data bus via the CPU; and a screen display for inputting the processed data of this screen display data memory and the output data of the timing control circuit. n configured in parallel with a character memory, a shift register into which the contents of the screen display character memory and output data of the timing control circuit are input, and an image signal output circuit which outputs a color signal in accordance with the output of the shift register. A bit register, an n-bit counter that inputs the value of the n-bit register, a comparison circuit that inputs the output of this n-bit counter, and a display color boundary control circuit that controls the boundaries of display colors according to the output of this comparison circuit. A television screen display device comprising: a polarity switching circuit which inputs output data of the display color boundary control circuit.