JPH089416A - Display device - Google Patents

Abstract

PURPOSE:To provide a means for confirming or correcting the level difference of respective chrominance signals of RGB signal sources. CONSTITUTION:Corresponding to the output of a switching signal generator 8 for generating a switching signal synchronized with a horizontal synchronizing signal or a vertical synchronizing signal inputted to an input terminal 4, signal switchers 5-7 switch respective RGB signals inputted to input terminals 1-3, a luminance component driven by the red signal, luminance component driven by the green signal and luminance component driven by the blue signal are simultaneously displayed on the same screen of a display element 12 in the time-sharing manner and by comparing the brightness of those luminance levels, the level difference of source signals is easily detected and confirmed or corrected.

Description

Detailed Description of the Invention

[0001]

The present invention relates to analog R, G, B
The present invention relates to a (red, green, blue) drive type display device, and more particularly, to a display device improved for applications that require accurate color reproducibility.

[0002]

2. Description of the Related Art A conventional analog R, G, B drive display device has no means for confirming the level difference between color signals of R, G, B signal sources.

[0003]

When the color signals of the R, G and B signal sources have level differences, the R and G signals of the signal sources are accurate even if the white balance on the display device side is accurate. , B has no means for confirming or correcting an error in white balance caused by a level difference between B and B, and there is a problem in accurate color reproducibility.

In view of the above, the present invention converts the level difference between the color signals of the R, G, and B signal sources into the brightness difference of the screen, and displays the same on the same screen of the display device. An object of the present invention is to provide a means for easily confirming or correcting the level difference of each color signal of R, G, B signal sources by displaying the luminance of R, G, B signals separately.

[0005]

In order to solve the above problems, the structure of the display device with R, G, B signal level confirmation and correction functions of the present invention is as follows: , 3 input 1 output input signal switchers of the first, second and third three inserted into the respective signal lines of green, green and blue, and each of the above in synchronization with the horizontal synchronizing signal or the vertical synchronizing signal. A switching signal generator for controlling the input signal switching device, and the first three inputs 1
The inputs of the output input signal switchers are connected to the red, green and blue input signal lines respectively, and the second three inputs 1
The inputs of the output input signal selectors are respectively connected to the red, green and blue input signal lines, and the inputs of the third 3-input 1-output input signal selectors are also respectively red, green and blue inputs. It is configured to be connected to the signal line.

In the display device according to claim 2,
One input signal switcher with three inputs and one output inserted in each of the red, green, and blue signal lines, two switches, and the input signal switcher in synchronization with the horizontal sync signal or the vertical sync signal. And a switching signal generator for controlling, and the inputs of the input signal switching device of 3 inputs and 1 output are connected to red, green and blue, respectively.

In the display device according to claim 3,
The first, inserted in the red, green, and blue signal lines,
Input signal switchers of three second inputs, three inputs and one output, a switching signal generator that controls each input signal switcher in synchronization with a horizontal synchronizing signal or a vertical synchronizing signal, and three variable It has a gain type amplifier, and the inputs of the first three-input one-output input signal switcher are red, green,
The inputs of the second 3-input 1-output input signal switch connected to the blue input signal line are red, green, and
The input of the third 3-input 1-output input signal switch connected to the blue input signal line is also red,
The output of each signal switcher is connected to the green and blue input signal lines and connected to each of the variable gain amplifiers.

[0008]

According to the present invention, the R, G, and B signals that may contain level errors are switched by the switching signal in synchronization with the horizontal synchronizing signal or the vertical synchronizing signal by the above-described configuration, and the red signals are time-divisionally displayed on the same screen. The brightness component driven by the signal, the brightness component driven by the green signal, and the brightness component driven by the blue signal are displayed simultaneously, and the level difference of the source signal can be easily compared by comparing the brightness of the brightness level. It has the effect of being able to detect and confirm, or to easily correct the level difference of the source signal.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to an embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing an embodiment of a display device with an R, G, B signal level confirmation function according to claim 1 of the present invention.

In FIG. 1, 1 is a red signal input terminal, 2
Is a green signal input terminal, 3 is a blue signal input terminal, and 4 is a synchronization signal input terminal. Also, 5 is a 3-input 1-output input signal switch inserted into the red signal line, 6 is a 3-input 1-output input signal switch inserted into the green signal line, and 7 is a blue signal line. It is also an input signal switcher with three inputs and one output. Further, 8 is a switching signal generator for switching the input switching device in synchronization with the horizontal synchronizing signal, 9 is a red signal amplifying circuit, 10 is a green signal amplifying circuit,
Reference numeral 11 is a blue signal amplifying circuit, and 12 is a display display element such as a cathode ray tube or liquid crystal. Also, 13 is 8
2 is a switch for switching the switching signal generator of (1) from the normal mode to the confirmation mode.

The operation of the display device having the R, G, B signal level confirmation function constructed as described above will be described below.

First, in a normal state, the mode control switch 13 is released, and the switching signal generator 8 controls the input signal switching devices 5, 6 and 7 with 3 inputs and 1 output according to the mode shown in FIG. The red signal externally connected to the input terminal 1 passes through the signal switch 5 and the red signal amplifier circuit 9 and is connected to the red signal input of the display element 12,
The green signal externally connected to the input terminal 2 passes through the signal switch 6 and the green signal amplifier circuit 10, and is passed through the display element 12
The blue signal connected to the green signal input of the above and externally connected to the input terminal 3 passes through the signal switch 7 and the amplification circuit 11 for the blue signal and is connected to the blue signal input of the display element 12. In this state, the display device is no different from a normal display device.

Here, when the mode control switch 13 is short-circuited, the switching signal generator 8 shifts to the confirmation mode, and in accordance with the mode shown in FIG. 2, the three inputs inserted in the red signal line within one horizontal period. The outputs of the 1-output input signal switch 5, the 3-input 1-output input signal switch 6 inserted in the green signal line, and the 3-input 1-output input signal switch 7 inserted in the blue signal line are An output signal for switching at high speed is generated so as to output the screen 1, the screen 2, and the screen 3.

Thus, the red signal externally connected to the input terminal 1 during the 1/3 period from before the horizontal scanning corresponding to the screen 1 is the signal switch 5, the signal switch 6, and the signal. The signals are distributed by the switch 7 and pass through the red signal amplifying circuit 9, the green signal amplifying circuit 10, and the blue signal amplifying circuit 11, respectively, and are simultaneously input to the red signal input, the green signal input, and the blue signal input of the display element 12. Therefore, the black and white screen driven by the red signal is displayed in the 1/3 period before the horizontal scanning. Further, in the central 1/3 period of the horizontal scanning corresponding to the screen 2, the green signal externally connected to the input terminal 2 is distributed by the signal switcher 5, the signal switcher 6, and the signal switcher 7. , Red signal amplification circuit 9 and green signal amplification circuit 1, respectively
0, the signal passes through the blue signal amplifying circuit 11, and is simultaneously input to the red signal input, the green signal input, and the blue signal input of the display element 12, and a black and white screen driven by the green signal in the central 1/3 period of horizontal scanning. Will be displayed.

Then, in the period of 1/3 from the rear of the horizontal scanning corresponding to the screen 3, the blue signal externally connected to the input terminal 3 is the signal switch 5, the signal switch 6, and the signal switch. 7 is distributed, and passes through the red signal amplification circuit 9, the green signal amplification circuit 10, and the blue signal amplification circuit 11, respectively, and is simultaneously input to the red signal input, the green signal input, and the blue signal input of the display element 12, In the 1/3 period after the horizontal scanning, the black and white screen driven by the blue signal is displayed. As a result, the screen shows the levels of the red signal externally connected to input terminal 1, the green signal externally connected to input terminal 2, and the blue signal externally connected to input terminal 3. A black and white luminance signal appears as shown in FIG.

As described above, according to this embodiment, by switching the timing of the switching signal in synchronization with the horizontal synchronizing signal, the red signal is driven to the left ⅓ of the screen and the level of the red signal is changed. The black-and-white brightness signal of brightness proportional to is driven to the green signal in the center 1/3 of the screen, and the black-and-white brightness signal of brightness proportional to the green signal level is moved to the right 1/3 of the screen. While being driven by a blue signal, a black and white luminance signal having a luminance proportional to the blue signal level can be simultaneously obtained in one screen, and the level difference between the R, G, and B source signals can be determined by comparing the brightness signal brightness and darkness. The difference will be clearly visible.

Although the switching signal generator 8 is switched in synchronization with the horizontal synchronizing signal in the embodiment shown in FIG. 1, it may be switched in synchronization with the vertical synchronizing signal. In this case, it goes without saying that the directions in which the primary screen signals are separately displayed on the confirmation screen are from left to right and up and down.

(Embodiment 2) FIG. 4 is a block diagram showing an embodiment of a display device with an R, G, B signal level confirmation function according to claim 2 of the present invention.

In FIG. 4, 14 is a red signal input terminal,
15 is a green signal input terminal, 16 is a blue signal input terminal, 1
Reference numeral 7 is an input terminal for a synchronization signal. Further, 18 is a 3-input 1-output input signal switcher inserted in the red signal line, 19 is a switch inserted in the green signal line, 20
Is a switch inserted in the green line,
Is a switching signal generator that switches the input selector in synchronization with the horizontal sync signal, 22 is a red signal amplifier circuit, 23 is a green signal amplifier circuit, 24 is a blue signal amplifier circuit, and 25 is a display display such as a cathode ray tube or liquid crystal. It is an element. Reference numeral 26 is a switch for switching the switching signal generating device 21 from the normal mode to the confirmation mode.

The operation of the display device with the R, G, B signal level confirmation function constructed as described above will be described below.

First, in a normal state, the mode control switch 26 is released, and the switching signal generator 21 controls the 3-input 1-output input signal selector 18 and the switches 19 and 20 in accordance with the mode shown in FIG. The red signal externally connected to the input terminal 14 passes through the signal switch 18 and the red signal amplifying circuit 22, and passes through the display element 2
The green signal which is connected to the red signal input of 5 and is externally connected to the input terminal 15 passes through the amplification circuit 23 of the green signal 19 and is connected to the green signal input of the display element 25 and the input terminal 1
A blue signal externally connected to 6 passes through the switch 20 and a blue signal amplifier circuit 24, and is connected to the blue signal input of the display element 25. In this state, the display device is no different from a normal display device.

Here, when the mode control switch 26 is short-circuited, the switching signal generator 21 shifts to the confirmation mode,
According to the mode shown in FIG. 5, each output of the input signal switcher 18 of three inputs and one output inserted in the line of the red signal within one horizontal period becomes the output of the screen 1, the screen 2, and the screen 3. In addition, an output signal that switches at high speed is generated. In this confirmation mode, the switch 19 inserted in the green signal line and the switch 20 inserted in the blue signal line are open as is apparent from FIG. 5, and the green signal amplification circuit 23 and the blue signal amplification circuit 23 are open. No signal is supplied to the signal amplifier circuit 24, and the display element 25 does not emit light in colors other than red.

Thus, the red signal externally connected to the input terminal 1 during the period of 1/3 from the time before the horizontal scanning corresponding to the screen 1 is output from the signal switch 18 to the amplification circuit 22 for the red signal. Then, the red signal is input to the red signal input of the display element 12, and the red screen driven by the red signal is displayed in the 1/3 period from before the horizontal scanning. In addition, the center 1/3 of the horizontal scanning corresponding to the screen 2
In the period of, the green signal externally connected to the input terminal 15 is input from the signal switch 18 through the red signal amplifier circuit 22 to the red signal input of the display element 25, and horizontal scanning is performed. In the central 1/3 period, the red screen driven by the green signal is displayed.
Then, during a period of 1/3 from the rear of the horizontal scanning corresponding to the screen 3, the blue signal externally connected to the input terminal 16 is output from the signal switch 18 to the amplification circuit 22 for the red signal.
Thus, the red signal is input to the red signal input of the display element 25, and the red screen driven by the blue signal is displayed in the 1/3 period after the horizontal scanning. As a result, the screen shows the levels of the red signal externally connected to the input terminal 14, the green signal externally connected to the input terminal 15, and the blue signal externally connected to the input terminal 16. A bright and dark red signal appears as shown in FIG.

As described above, according to this embodiment, by switching the timing of the switching signal in synchronization with the horizontal synchronizing signal, the red signal is driven to the left ⅓ of the screen and the red signal level is The red luminance signal whose luminance is proportional to is driven to the green signal in the center 1/3 of the screen, and the red luminance signal whose luminance is proportional to the green signal level is to the right 1/3 of the screen. While being driven by a blue signal, a red luminance signal having a luminance proportional to the blue signal level will be simultaneously obtained in one screen,
The level difference between the R, G, and B source signals can be clearly visually recognized as the brightness difference of the red signal. Further, as compared with the first embodiment, only one input signal switching device with three inputs and one output is required, and the circuit itself of the switching signal generator can be simplified.

Although the switching signal generator 21 is switched in synchronization with the horizontal synchronizing signal in the embodiment of FIG. 4, it may be switched in synchronization with the vertical synchronizing signal. In this case, it goes without saying that the directions in which the primary screen signals are separately displayed on the confirmation screen are from left to right and up and down.

Further, in the embodiment shown in FIG. 4, the input signal switch 18 having three inputs and one output is inserted in the line of red signal, but it may be inserted in the signal line of green or blue. In this case, it is natural that the actual confirmation screen changes from a single red color to a single green or blue screen.

(Embodiment 3) FIG. 6 is a block diagram showing an embodiment of a display device with an R, G, B signal level correcting function according to a third aspect of the present invention.

In FIG. 6, 27 is a red signal input terminal,
28 is a green signal input terminal, 29 is a blue signal input terminal, 3
Reference numeral 0 is a sync signal input terminal. Further, 31 is a 3-input 1-output input signal switch inserted into the red signal line, 32 is a 3-input 1-output input signal switch inserted into the green signal line, and 33 is a blue signal line. It is also an input signal switcher with 3 inputs and 1 output.
Is a switching signal generator that switches the input selector in synchronization with the horizontal synchronizing signal, 35 is a variable gain type amplifier circuit for red signals, 36 is a variable gain type amplifier circuit for green signals, 37 is a variable gain type amplifier circuit for blue signals, Reference numeral 38 denotes a display display element such as a cathode ray tube or liquid crystal. Also, 39
Is a switch for switching 34 switching signal generators from the normal mode to the confirmation mode.

The operation of the display device having the R, G, B signal level confirmation function constructed as described above will be described below. First, in normal time, the mode control switch 39 is released, and the switching signal generator 34 is
The three-input one-output input signal switchers 31, 32 and 33 are controlled according to the mode shown in FIG. 2, and the red signal externally connected to the input terminal 27 is the signal switcher 31 and the red signal variable. The green signal that passes through the gain type amplifying circuit 35 and is connected to the red signal input of the display element 38 and externally connected to the input terminal 28 passes through the signal switch 32 and the variable gain type amplifying circuit 36 of the green signal, The blue signal connected to the green signal input of the display element 38 and externally connected to the input terminal 29 passes through the signal switch 33 and the variable gain type amplifier circuit 37 of the blue signal and is connected to the blue signal input of the display element 38. ing.

In this state, the display device is no different from a normal display device. Here, when the mode control switch 39 is short-circuited, the switching signal generator 34 shifts to the confirmation mode, and according to the mode shown in FIG. 2, the 3-input 1-output of the 3-input 1-output inserted in the line of the red signal within one horizontal period is performed. The respective outputs of the input signal switching device 31, the 3-input 1-output input signal switching device 32 inserted in the green signal line, and the 3-input 1-output input signal switching device 33 inserted in the blue signal line are the screen 1, An output signal for switching at high speed is generated so as to output the screens 2 and 3. Thus, the red signal externally connected to the input terminal 27 during the 1/3 period from before horizontal scanning corresponding to the screen 1 is the signal switch 31, the signal switch 32, and the signal switch 33. And the red signal input, green signal input, and blue signal input of the display element 38 through the variable gain type amplifier circuit 35 for red signal, the variable gain type amplifier circuit 36 for green signal, and the variable gain type amplifier circuit 37 for blue signal, respectively. , And the black and white screen driven by the red signal is displayed in the 1/3 period before the horizontal scanning.

The center 1 of the horizontal scan corresponding to the screen 2
In the period of / 3, the green signal externally connected to the input terminal 28 is distributed by the signal switch 31, the signal switch 32, and the signal switch 33, and the red signal variable gain amplifier circuit 35, It passes through the green signal variable gain type amplifier circuit 36 and the blue signal variable gain type amplifier circuit 37, and is simultaneously input to the red signal input, the green signal input, and the blue signal input of the display element 38.
In the / 3 period, the black and white screen driven by the green signal is displayed. Then, in a period of 1/3 from the back of the horizontal scanning corresponding to the screen 3, the blue signal externally connected to the input terminal 29 is changed to the signal switch 31,
The signals are distributed by the signal switch 32 and the signal switch 33, pass through the red signal variable gain amplifying circuit 35, the green signal variable gain amplifying circuit 36, and the blue signal variable gain amplifying circuit 37, respectively, and pass through the red of the display element 38. The signals are simultaneously input to the signal input, the green signal input, and the blue signal input, and the black and white screen driven by the red signal is displayed in the 1/3 period after the horizontal scanning.

As a result, each of the red signal externally connected to the input terminal 27, the green signal externally connected to the input terminal 28, and the blue signal externally connected to the input terminal 29 is displayed on the screen. A black and white luminance signal corresponding to the level appears as shown in FIG.

As described above, according to this embodiment, by switching the timing of the switching signal in synchronization with the horizontal synchronizing signal, the red signal is driven to the left ⅓ of the screen and the red signal level is set. A black and white luminance signal of proportional luminance is driven to the green signal in the center ⅓ of the screen, and a black and white luminance signal of luminance proportional to the green signal level becomes a blue signal to the right ⅓ of the screen. As it is driven, a black and white luminance signal whose luminance is proportional to the blue signal level is simultaneously obtained in one screen,
The level difference between the R, G, and B source signals can be clearly recognized as the difference between the brightness and darkness of the luminance signal. And even more, 3
The respective gains of the red signal variable gain amplifier circuit of 5, the green signal variable gain amplifier circuit of 36, and the blue signal variable gain amplifier circuit of 37 are appropriately changed so that there is no brightness difference on the screen. By doing so, it is possible to correct the level difference of the signal source and obtain an accurate white balance.

Although the switching signal generator 34 is switched in synchronization with the horizontal synchronizing signal in the embodiment of FIG. 6, it may be switched in synchronization with the vertical synchronizing signal. In this case, it goes without saying that the directions in which the primary screen signals are separately displayed on the confirmation screen are from left to right and up and down.

[0036]

As described above, the display device with the R, G, B signal level confirmation function and the display device with the R, G, B signal level correction function of the present invention include R, G, B which may include level error. Switching each signal with a switching signal synchronized with the horizontal synchronization signal or the vertical synchronization signal,
The luminance component driven by the red signal, the luminance component driven by the green signal, and the luminance component driven by the blue signal are displayed simultaneously on the same screen in a time-division manner, and the brightness levels are compared. Therefore, the level difference of the source signal can be easily visually confirmed or the level difference of the source signal can be easily corrected, and the practical effect thereof is great.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a display device according to a first embodiment of the present invention.

FIG. 2 is an output state diagram of the switching device in FIG.

FIG. 3 is a display example of a screen and a luminance signal diagram according to the present invention.

FIG. 4 is a block configuration diagram of a display device according to a second embodiment of the present invention.

5 is an output state diagram of the screen changer and the switch in FIG.

FIG. 6 is a block configuration diagram of a display device according to a third embodiment of the present invention.

[Explanation of symbols]

1, 2, 3, 4, 14, 15, 16, 17, 27, 2
8, 29, 30 Input terminal 5, 6, 7, 18, 31, 32, 33 Input signal switcher 8, 21, 34 Switching signal generator 9, 10, 11, 22, 23, 24 Amplification circuit 12, 25, 38 display element 13, 26, 39 switch for switching from normal mode to confirmation mode 19, 20 switch 35, 36, 37 variable gain amplifier circuit

Claims (3)

[Claims] 1. A first, second, and third three-input one-output input signal switcher inserted in each of the red, green, and blue signal lines, and a horizontal synchronizing signal or a vertical synchronizing signal. And a switching signal generator that controls each of the input signal switching devices in synchronism, and the inputs of the first three-input one-output input signal switching device are connected to red, green, and blue input signal lines, respectively. The inputs of the second 3-input 1-output input signal switch are connected to the red, green, and blue input signal lines, respectively, and the input of the third 3-input 1-output input signal switch is also connected. A display device characterized by being connected to red, green, and blue input signal lines, respectively. 2. A single 3-input 1-output input signal switcher inserted in each of the red, green and blue signal lines, and 2.
Switches and a switching signal generator that controls the input signal switching device in synchronization with a horizontal synchronizing signal or a vertical synchronizing signal, and the inputs of the 3-input 1-output input signal switching device are red and green, respectively. , A display device characterized by being connected to blue. 3. A first, second, and third three-input one-output input signal switcher inserted in each of the red, green, and blue signal lines, and a horizontal synchronizing signal or a vertical synchronizing signal. It has a switching signal generator for controlling each of the input signal switching devices in synchronism with each other and three variable gain type amplifiers, and the inputs of the first three-input one-output input signal switching device are red, green and blue, respectively. Input signal line of the second 3-input 1-output, and the inputs of the second 3-input 1-output input signal switchers are connected to the red, green, and blue input signal lines, respectively, and the third 3-input 1-output input. The display device, wherein the input of the signal switch is also connected to the red, green, and blue input signal lines, respectively, and the output of each signal switch is connected to the variable gain amplifier.