JPH1028232A - display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the apparent graphic distortion and to improve the display quality by preparing a graphic distortion-generation circuit which generates the graphic distortion at an infinite visual point, in order to reduce the apparent graphic distortion that is caused at a finite visual point. SOLUTION: The signal inputted to a signal input terminal T1 is added to a drive circuit 2, which converts the signal into a drive signal suitable to a display device 1 and adds it to the device 1. The display screen of the device 1 is curved, and a user sees this curved screen with a finite distance. Thus, the apparent graphic distortion is generated. When the user inputs the visual point position to a visual point position input means 6, the visual point position information is fetched by an arithmetic controller 4. A memory 5 stores the graphic distortion generation data to reduce the apparent graphic distortion, corresponding to the visual point position. Then the controller 4 generates the graphic distortion corresponding to the input visual point position information, and a graphic distortion generation circuit 3 produces a graphic distortion generation signal and outputs it to the circuit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display.

[0002]

2. Description of the Related Art Conventionally, in a display having a curved display surface such as a cathode ray tube display, adjustment is made so that the figure distortion when viewed from infinity is minimized.

[0003] The prior art relating to this type of display is disclosed in JP-A-6-334887 and JP-A-6-23314.
No. 9 publication.

[0004]

In the above conventional example, even if there is no figure distortion as viewed from a point at infinity, an apparent figure distortion generated when viewed from a finite point of view, which is a user's usage environment, is taken into consideration. Not.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display having a curved display surface, to reduce apparent graphic distortion generated when viewed from a finite viewpoint, and to improve display quality in a user's use environment.

[0006]

In order to solve the above-mentioned problems, the present invention generates a graphic distortion at an infinite viewpoint so as to reduce an apparent graphic distortion occurring when viewed from a finite viewpoint. A graphic distortion generating circuit is provided.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of a display according to the present invention. In FIG. 1, 1 is a display device, 2 is a drive circuit, 3 is a graphic distortion generation circuit, 4 is an arithmetic control circuit, 5 is a memory, 6 is a viewpoint position input means, and T1 is a signal input terminal.

In FIG. 1, a signal input to a signal input terminal T 1 is applied to a drive circuit 2. This signal is supplied to the drive circuit 2
Is converted into a drive signal suitable for the display device 1 and is applied to the display device 1. The display surface of the display device 1 is curved, and the user views the display from a finite distance, and apparent graphic distortion occurs. When the user inputs the viewpoint position to the viewpoint position input means 6, the viewpoint position information is taken into the arithmetic and control circuit 4. The memory 5 holds graphic distortion generation data for reducing apparent graphic distortion corresponding to the viewpoint position, and the arithmetic and control circuit 4 creates graphic distortion generation data corresponding to the input viewpoint position information, Output to the graphic distortion generating circuit 3. The graphic distortion generation circuit 3 creates a graphic distortion generation signal from the graphic distortion generation data and outputs the signal to the drive circuit 2. As a result, it is possible to reduce apparent graphic distortion and improve display quality in a user's use environment.

FIG. 2 shows an example of apparent graphic distortion of a CRT display. (A) is a case where the display surface is cylindrical only curved in the horizontal direction, and (b) is a case where the display surface is spherical. In each case, the dotted line shows the case where there is no figure distortion at the point at infinity, and the solid line shows the apparent figure distortion seen from finite distance on the X mark.

FIG. 3 shows a first embodiment of a CRT according to the present invention.
The example applied to the display is shown. In FIG.
Is a video preamplifier, 52 is a video output circuit, 53 is a vertical deflection coil, 54 is a horizontal deflection coil, 55 is a CRT,
56 is a vertical deflection circuit, 57 is a horizontal deflection circuit, 58 is a high voltage circuit, T2 is a horizontal synchronization signal input terminal, T3 is a vertical synchronization signal input terminal, and T6 is a video signal input terminal.

That is, in the CRT display, the display device 1 corresponds to the CRT 55, the vertical deflection coil 53, and the horizontal deflection coil 54. The drive circuit 2 corresponds to a video preamplifier 51, a video output circuit 52, a vertical deflection circuit 56, and a horizontal deflection circuit 57.

FIG. 4 is a circuit diagram showing a first example of the vertical deflection circuit 56, the horizontal deflection circuit 57, and the graphic distortion generation circuit 3 shown in FIG. 3, in which the display surface of the CRT is a cylindrical shape curved only in the horizontal direction. It is.

In this case, apparent graphic distortion can be reduced by providing upper and lower independent pin distortion generating circuits and vertically independent horizontal linearity distortion generating circuits as the graphic distortion generating circuit 3 as shown in FIG. .

In FIG. 4, 7 is a horizontal oscillation circuit, 8 is a horizontal drive circuit, 9 is a horizontal output transistor, 10 is a damper diode, 11 is a resonance capacitor, 12 is a horizontal deflection coil, 13 is a choke coil, and 14 is an S-shape. Capacitor, 1
5 is a horizontal blanking pulse generating circuit, 16 is a horizontal sawtooth wave generating circuit, 17 is a horizontal parabolic wave generating circuit, 1
8, 19, 20, 21 are voltage controlled amplifiers, 22, 23,
24 is an adder, 25 is a multiplier, 26 is an S-shaped voltage control circuit, 27 is a control voltage generation circuit, 28 is a vertical oscillation circuit,
9 is a differential amplifier, 30 is a vertical output amplifier, 31 is a vertical deflection coil, 32 is a capacitor, and 33 is a resistor.

The operation of FIG. 4 will be described below.

A horizontal oscillation circuit 7, a horizontal drive circuit 8, a horizontal output transistor 9, a damper diode 10, a resonance capacitor 11, a horizontal deflection coil 12, and a choke coil 1.
3. The S-shaped capacitor 14 forms a horizontal deflection circuit 57, and a horizontal sawtooth current having the same frequency as the horizontal synchronization signal input from the horizontal signal input terminal T2 flows through the horizontal deflection coil 12.

A vertical oscillation circuit 28, a differential amplifier 29, a vertical output amplifier 30, a vertical deflection coil 31, and a capacitor 3
2. The resistor 33 forms a vertical deflection circuit 56, and a vertical sawtooth current having the same frequency as the vertical synchronization signal input from the vertical synchronization signal input terminal T3 flows through the vertical deflection coil 31.

Horizontal blanking pulse generator 15, horizontal sawtooth generator 16, horizontal parabola generator 1
7, the voltage control amplifiers 18 and 19, the adder 22, and the S-shaped voltage control circuit 26 constitute a left and right independent horizontal linearity distortion generation circuit, and the horizontal deflection circuit 57 is formed by a composite signal of a horizontal parabola wave and a horizontal sawtooth wave. By controlling the voltage of the S-shaped capacitor 14, left and right independent horizontal linearity distortion is generated.

The horizontal parabolic wave generating circuit 17, the voltage control amplifiers 20, 21, the adder 24, and the multiplier 25 constitute an upper / lower pin distortion generating circuit capable of vertically adjusting independently. The vertical deflection current is controlled by inputting a combined signal of the multiplication signal with the parabolic wave to the differential amplifier 29 of the vertical deflection circuit 56 by the adder 23, thereby generating upper and lower independent pin distortion.

The control voltage generation circuit 27 includes an arithmetic control circuit 4
And sends a control voltage to the voltage control amplifiers 18, 19, 20, and 21 to adjust the amplitude of each figure distortion component so that the apparent figure distortion is reduced. As a result, it is possible to improve display quality in a user's use environment.

FIG. 5 is a circuit diagram showing a second example of the vertical deflection circuit 56, the horizontal deflection circuit 57, and the graphic distortion generation circuit 3 in FIG. 3, in which the display surface of the CRT is spherical.

In this case, apparent figure distortion can be obtained by adding a left and right pin distortion generating circuit capable of independently adjusting left and right and a vertical linearity distortion generating circuit which is vertically independent as FIG. 4 as the figure distortion generating circuit 3 from FIG. 2B. Can be reduced.

In FIG. 5, 34 is an adder, 35 is a horizontal synchronizing signal delay circuit, 36 is a power supply voltage modulation circuit, and 37, 38, and 3
9 and 40 are voltage control amplifiers, 41 is a control voltage generation circuit,
42 is a vertical parabolic wave generation circuit, 43 is a vertical S-shaped correction signal generation circuit, and 44 is a vertical blanking pulse generation circuit.

The vertical parabolic wave generating circuit 42, the vertical blanking pulse generating circuit 44, and the horizontal synchronizing signal delay circuit 3
5. Power supply voltage modulation circuit 36, voltage control amplifiers 37 and 38
Constitutes a left and right pin distortion generating circuit capable of right and left independent adjustment, and applies a vertical parabola wave to a horizontal synchronizing signal delay circuit 35 and a power supply voltage modulation circuit 36 to generate left and right independently adjustable left and right pin distortion.

The voltage control amplifiers 39 and 40, the adder 34,
The vertical S-shaped correction signal generation circuit 43 constitutes a vertical linearity distortion generation circuit which is independent of the upper and lower sides. Generate vertical linearity distortion.

The control voltage generation circuit 41 includes an arithmetic control circuit 4
And voltage control amplifiers 18, 19, 20, 21,
The control voltage is sent to 37, 38, 39, and 40, and the amplitude of each graphic distortion component is adjusted so that the apparent graphic distortion is reduced. As a result, it is possible to improve display quality in a user's use environment.

FIG. 6 is a block diagram showing a second embodiment according to the present invention. The difference from FIG.
Is replaced by the viewpoint position detecting means 45.

The viewpoint position detecting means 45 automatically detects the viewpoint position of the user and inputs the viewpoint position information to the arithmetic and control circuit 4. Other operations are the same as those in FIG. 1, and there is an effect that the apparent graphic distortion generated when the user automatically sees from a finite distant viewpoint without inputting the viewpoint position can be reduced.

[0030]

According to the display of the present invention, it is possible to reduce apparent graphic distortion generated when viewed from a finite distance viewpoint, and to improve display quality in a user's use environment.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment according to the present invention.

FIG. 2 is an explanatory diagram showing an example of apparent graphic distortion.

FIG. 3 is a block diagram of an example in which the first embodiment according to the present invention is applied to a CRT display.

FIG. 4 is a circuit diagram showing a first example of the deflection circuit and the graphic distortion generation circuit of FIG. 3;

FIG. 5 is a circuit diagram showing a second example of the deflection circuit and the graphic distortion generation circuit of FIG. 3;

FIG. 6 is a block diagram showing a second embodiment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Display device, 2 ... Drive circuit, 3 ... Graphic distortion generation circuit, 4 ... Operation control circuit, 5 ... Memory, 6 ... Viewpoint position input means, 12 ... Horizontal deflection coil, 31 ... Vertical deflection coil, 45 ... Viewpoint position Detection means.

Claims (4)

[Claims] 1. A display using a display device having a curved display surface, wherein a graphic distortion generation circuit is provided for reducing apparent graphic distortion generated when the distance from the display surface to the viewpoint is finite. Display. 2. An apparatus according to claim 1, further comprising a viewpoint position input means, a memory for storing graphic distortion generation data for the viewpoint position, and an arithmetic control circuit. A display that reduces distortion. 3. The display according to claim 1, further comprising a viewpoint position detecting means, a memory for storing figure distortion occurrence data for the viewpoint position, and an arithmetic control circuit, wherein the apparent figure distortion is automatically reduced. 4. The display according to claim 1, wherein said display device is a cathode ray tube.