KR200148510Y1 - Apparatus for displaying with oneself clamp pulse generation circuit - Google Patents

Abstract

The present invention relates to a display device having a self-clamp pulse generating circuit. In a display device in which a clamp pulse cannot be generated and a video signal cannot be output unless a horizontal / vertical sync is input from the outside, the horizontal / vertical sync is By providing a display device having a microcomputer which generates the horizontal / vertical synchronization by itself when it is not input, and a control circuit which controls the generation of the clamp pulse in accordance with the presence / absence of the horizontal / vertical synchronization, The production line can also generate clamp pulses on its own and control the video preamplifier device to output video screens without the need for an artificial signal source adapter, thereby reducing production costs and simplifying the production process.

Description

Display device with self clamp pulse generator

The present invention relates to a display device having a self-clamp pulse generating circuit. More specifically, when there is no horizontal / vertical sync input from the outside, the microcomputer outputs its horizontal / vertical sync and clamps the clamp according to the horizontal sync. The present invention relates to a display device having its own clamp pulse generation circuit which enables to output a video signal without using an external signal source adapter.

In general, color monitors often have an On Screen Display (OSD) function.

These monitors use video preamplifiers that process video and OSD signals. Among the devices that process both video and OSD signals, whether the video preamplifier outputs the signal due to the presence of clamp pulses, such as the LM1282. There are elements in which is determined.

The device generates a clamp pulse in the microcomputer according to the horizontal synchronization input from an external signal source, and the video preamplifier device controls the video signal and the OSD signal by using the generated clamp pulse.

In general, the conventional video signal control circuit according to horizontal / vertical synchronization is shown in FIG. Generates clamp pulses according to horizontal synchronization.

The video signal processor 11 controls the video signal and the OSD signal by receiving the clamp pulse.

However, if the horizontal / vertical synchronization is not applied from the external signal source, the microcomputer 10 that controls the horizontal / vertical synchronization cannot generate the clamp pulse, and the video signal processing unit 11 cannot output the video signal.

That is, the conventional video signal control circuit has a problem when it is necessary to control the video preamplifier device and output the video signal output even when there is no horizontal / vertical synchronization.

In the process of aging or hot-burning the monitor before adjusting the monitor in the production line, there is no horizontal / vertical synchronization from an external signal source. You must use an adapter.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to generate its own horizontal / vertical synchronization in a microcomputer when no horizontal / vertical synchronization is input from an external signal source, Accordingly, the present invention provides a display device having a self-clamping pulse generating circuit capable of processing a video signal and an OSD signal without using an external signal source adapter by generating a clamp pulse.

1 is a schematic block diagram of a video signal control circuit according to a conventional horizontal / vertical synchronization;

2 is a schematic block diagram of a video signal control circuit having a clamp pulse generation circuit to which the present invention is applied;

3 is a detailed view of a video signal control circuit having a clamp pulse generation circuit to which the present invention is applied.

Explanation of symbols used in the main part of the drawing

10: microcomputer

11: video signal processor

20: Clamp pulse control circuit with or without horizontal / vertical synchronization

R1, R2, R3: resistor

T1, T2: Transistor

Features of the present invention for achieving the above object,

In the display device for controlling the clamp pulse in accordance with the presence or absence of the horizontal / vertical synchronization,

Synchronization signal generating means for generating horizontal / vertical synchronization by itself when the horizontal / vertical synchronization is not input;

There is a display device having a self-clamp pulse generating circuit composed of a control circuit for controlling the generation of the clamp pulse in accordance with the presence or absence of horizontal / vertical synchronization.

The synchronizing signal generating means is a microcomputer which generates its own horizontal / vertical synchronism by continuously turning on / off the switch when the horizontal / vertical synchronism is not input from an external signal source. It is composed of two transistors that perform the switching function, and generates the clamp pulse by using the switching function depending on the presence of horizontal / vertical synchronization.

Hereinafter, a preferred embodiment of a display device having a self clamp pulse generation circuit according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a schematic block diagram of a video signal control circuit having a clamp pulse generation circuit according to the present invention, compared with the conventional video signal control circuit according to the conventional horizontal / vertical synchronization of FIG. It can be seen that the clamp pulse control circuit 20 has been added.

FIG. 3 is a detailed view of a video signal control circuit having a clamp pulse generation circuit according to the present invention, in which the clump pulse control circuit portion 20 with or without horizontal / vertical synchronization shown in FIG. 2 is shown in detail.

3, the clamp pulse control circuit with or without horizontal / vertical synchronization is implemented by two transistors T1 and T2. The base terminal of the transistor T1 is connected to the horizontal synchronization output terminal of the microcomputer. The emitter terminal is connected to the collector terminal of another transistor T2, and the collector terminal is connected to the clamp pulse output terminal of the microcomputer and the clamp pulse input terminal of the video signal processing unit 11, and the base of the transistor T2. The stage is connected to the D-SUB presence / absence determination stage of the microcomputer, the emitter stage is grounded, and the collector stage is connected to the transistor T1.

Referring to FIG. 3, when the horizontal / vertical synchronization is input and the horizontal / vertical synchronization is not input, the microcomputer 10 first adjusts the horizontal / vertical to the input frequency when the horizontal / vertical synchronization is input. Outputs synchronous and clamp pulses. At this time, when the low-zero volt is controlled to be applied to the D-SUB presence / absence determination stage, the transistor T2 is turned off, and thus the transistor T1 is also turned off. Therefore, the same clamp as the horizontal synchronizing frequency is applied to the clamp pulse input terminal of the video signal processing unit 11, so that the video signal processing unit 11 operates normally.

When the horizontal / vertical synchronization is not input, the microcomputer 10 generates and outputs the horizontal / vertical synchronization by itself.

In addition, a high (5) volt is applied to the D-SUB determination stage so that the transistor (T2) is turned on, and the microcomputer applies a high (5) volt so as to be a bias voltage for operating the transistor (T1) to the clamp pulse. Output

Accordingly, the transistor T1 generates horizontal sync and inverted pulses at the collector stage, and as a result, the video preamplifier can be controlled by the microcomputer without the horizontal / vertical sync.

As described above, according to the display device having a self-clamping pulse generating circuit according to the present invention, a video preamp device is produced even in a production line where horizontal / vertical synchronization is not input by generating a clamp pulse regardless of whether horizontal / vertical synchronization is input. By controlling the control panel and outputting the video screen, the desired brightness can be achieved without using an artificial signal source adapter, thereby reducing the production cost and simplifying the production process.

Claims (3)

In a display device that controls clamp pulses with or without horizontal / vertical sync input: Synchronization signal generating means for generating horizontal / vertical synchronization by itself when the horizontal / vertical synchronization is not input; Display device having a self-clamp pulse generating circuit, characterized in that the control circuit for controlling the generation of the clamp pulse in accordance with the presence of the horizontal / vertical synchronization input. The method according to claim 1, wherein the synchronization signal generating means, A display device having a self-clamping pulse generating circuit characterized in that the microcomputer generates horizontal / vertical synchronization by continuously turning on / off the switch when no horizontal / vertical synchronization is input. The control circuit of claim 1, wherein the control circuit controls the generation of the clamp pulse. A display device having a self-clamping pulse generator circuit comprising two transistors having a switching function and generating a clamp pulse by using a switching function according to whether there is a horizontal / vertical synchronization input.