JPH01316795A - Display device - Google Patents

Abstract

PURPOSE:To discriminate the difference of color information on a monochromatic display as a difference between two stages of brightness by combining an ON-OFF circuit for each frame with a color signal selecting circuit. CONSTITUTION:A switch circuit 120 is selected by a user to select a color signal to be displayed. For example, when only a switch 122 is turned on, a G signal (green) is displayed. When a switch 124 is also turned on in combination, the part of an R signal (red) is displayed while turned on and off at intervals of one frame, so the part of red illuminates with brightness a half as large as that of the part of green. When a switch 121 is further turned on, an R signal is outputted as a data signal at all times, so the function for tuning on and off the R signal at intervals of one frame is made ineffective. Consequently, an artificially two-gradation display is made.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display device, and more particularly to a display device that receives and displays digital R-G-B display signals from a personal computer or the like.

2. Description of the Related Art Conventionally, various types of digital display devices have been known, such as fluorescent display tubes and plasma displays, in which electrodes are arranged in a matrix in the vertical and horizontal directions, and the orthogonal intersections are lit. A display device requires a very complicated circuit to display gradation, and is usually used as a monochrome display device without gradation.

Problems to be Solved by the Invention The conventional monochrome digital display device described above utilizes R/G-B output signals for a digital color display of a control device, but only supports one color among them. However, the control device outputs a signal corresponding to a color display. For example, in the kanji conversion of recently popular Japanese word processors, confirmed characters and undefined characters are separated by changing their colors. In such application control devices, the monochrome digital display device described above cannot be used because it cannot distinguish between confirmed characters and undefined characters.

The present invention has been made in view of the above-mentioned conventional circumstances,
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel display device that makes it possible to eliminate the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems The feature of the present invention is that it is connected to a control device that outputs color signals of three colors R, G, and B, and only one or more color signals of R, G, and B are selected and displayed. In a display device, unselected color signals are turned on and off every frame of the display device.
Through the F circuit, the display portion containing the color component is blinked every frame to create a pseudo two-gradation display.

Embodiment Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram of a program showing one embodiment of the present invention.

Referring to FIG. 1, 10 is a color signal selection circuit, 20 is an ON-OFF circuit for each frame, 30 is a data side drive circuit, 40 is a scanning side drive circuit, and 50 is a matrix display. The three types of signals R2O and B are sent to the color signal selection circuit IO, where they become one data signal 11, which is sent to the data side drive circuit 30.
sent to. The data side drive circuit 30 is composed of a shift register, latch, and driver, and rearranges the serially sent data signals 11 into parallel signals using the clock signal 31.
The parallel outputs are connected to the electrodes X of the matrix display 50.
l, X 2...Output to Xo.

On the other hand, the scanning side drive circuit 40 has a horizontal synchronizing signal 41
and the vertical synchronizing signal 42 are input, synchronization is achieved with the vertical synchronizing signal 42, and the outputs Y, , Y2, and Y2 of the scanning side drive circuit 40 are input.
. . . Yfi is sequentially selected using the horizontal synchronization signal 41.

The matrix display 50 has its electrodes X,.

The dot at the selected intersection of X2...X3 and Y, Y2...Yfi lights up.

The frame-by-frame ON-OFF circuit 20 inputs the vertical synchronizing signal 42 and sends a signal that turns ON-OFF every time to the color signal selection circuit from its output 21.

Although the present display device is configured as described above, the color signal selection circuit IO and the ON-OFF circuit for each frame of the present invention will be explained with reference to FIG.

The three R, G, and B color signals are sent to waveform shaping inverter circuits 111, 112, and 113, respectively, and sent to the switch circuit 120 after waveform shaping.

The waveform-shaped signal 114 of the R signal is sent to the switch +21 and also to the OR gate 130. On the other hand, the other input terminal 141 of the OR gate 130 has
The output Q of the flip-flop 140 is connected to J.

Flip-flop 140 on J is its clock CK
Since the vertical synchronizing signal 42 is connected to the vertical synchronizing signal 42 and the inputs J, K, and R are connected to H level, a toggle operation is performed and the output Q is switched between high level and low level every time the vertical synchronizing signal 42 comes. The OR gate 130 outputs the waveform-shaped R signal 114 to the switch 124 when the input 141 is at a low level, and does not output the waveform-shaped R signal 114 to the switch +24 when the input 141 is at a high level.

In other words, the output 131 of the OR gate 130 has one period of the vertical synchronization signal, which is called one frame period, and if a signal appears during this one frame period, it will not appear in the next one frame period. A signal with no signal is obtained. NAN
The D gate I50 has its inputs all connected to the switch circuit +20, takes the negative OR of the signals that have passed through the respective switches 121 to +24, and outputs the result as a data signal 11.

Each of the switch circuits 120 is selected by the user and selects the color signal to be displayed. For example, if only the switch 122 is turned on, a G signal (green) can be displayed. In addition, if switch 124 is also turned on,
This time, the R signal (red) part changes to 0N- every frame.
The red part lights up at about one minute the brightness of the green part to display the display while the display is OFF. Furthermore, switch 12]
If it is turned on, the R signal will also be output as a data signal all the time.

The function of turning the R signal ON-OFF every frame no longer works.

As described in detail, according to the present invention, by combining a color signal selection circuit and an ON-OFF circuit for each frame, a single color display can be created by converting the difference in color information into a difference in two levels of brightness. It becomes possible to determine. In this embodiment, only the R signal (red) is turned ON/OFF, but other G and B signals may also be used, and a special color mixed by using exclusive OR can be specified. It can also be turned ON-OFF. Therefore, there is an advantage that a single-color display can be used without changing the software even in a word processing system that displays confirmed characters and unconfirmed characters in different colors as described above.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a display device according to the present invention. 10... Color signal selection circuit, 11... Data signal, 2
0...ON-OFF circuit for each frame, 30...Data side drive circuit, 40...Scanning side drive circuit,
50... Matrix display Figure 2 shows the color signal selection circuit and 0N-OF for each frame.
It is a logic diagram of F circuit. 111-113... Inverter circuit, 120... Switch circuit, 130... OR gate circuit, 140...
・JK flip-flop, 150... NAND gate patent applicant NEC Corporation Representative Patent attorney Yutabe Kumagai

Claims (1)

[Claims] Connect to a control device that outputs color signals of R, G, and B colors,
In a display device that selects and displays only one or more of R, G, and B color signals, the color components that are not selected are turned on and off for each frame of the display device. A display device characterized by blinking a display portion including a frame every frame to display a pseudo two-tone display.