JPH099178A - Display device - Google Patents

Abstract

(57) [Summary] [Structure] The plasma addressed liquid crystal display panel 14 is supported by the frame 50 to form a front plate of a videophone. This plasma addressed liquid crystal display panel 1
A transparent pressure-sensitive touch panel is arranged on the surface 4.
The plasma addressed liquid crystal display panel 14 displays the transmitted image 14a and also performs a display 14b instructing a pressing operation on the pressure-sensitive touch panel. [Effects] The received image can be viewed on the plasma addressed liquid crystal display panel 14, and various information signals can be input and transmitted by pressing the pressure sensitive touch panel according to the display 14b on the plasma addressed liquid crystal display panel 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a flat display section.

[0002]

2. Description of the Related Art Conventionally, a CRT (cathode ray tube) is used as a display unit.
And a display device configured to display an image based on an information signal.

In such a display device, a signal transmitting / receiving unit for transmitting / receiving information signals to / from a telephone line, a receiver having a microphone and a speaker,
There is one configured as a so-called videophone having a camera (imaging means) and a plurality of input keys for inputting information signals.

In such a display device,
The information signal input via the camera and the microphone can be transmitted to the telephone line while displaying the image based on the information signal transmitted via the telephone line on the display unit.

[0005]

By the way, in the display device as described above, the CRT has a depth length of about 50% to 100% with respect to the size of the image display surface. Is becoming larger.

In the above display device,
Since the weight of the CRT is considerably large, the CRT has a considerable weight as a whole, and it is difficult to select an installation site, move the installation site, store and transport it.

Further, in the above display device, it is difficult to change the direction of the display portion according to the use condition because the CRT has a large depth and a large weight.

Further, in the above-mentioned video telephone, the number of input keys (press switches) used for inputting the information signal is large, and the operation is complicated.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and is a display device configured as a video telephone, and the device configuration is reduced in size and weight, and the installation place is selected. Move, store, and move the installation location
It is an object of the present invention to provide a display device that is easy to transport and that can easily change the direction of each display unit according to a use state and is easy to operate.

[0010]

In order to solve the above-mentioned problems and achieve the above-mentioned object, a display device according to the present invention is provided with a flat display portion and a display surface portion of the flat display portion. A transparent pressure-sensitive input sheet, and a signal transmission / reception unit that receives an information signal sent via a telephone line and transmits an information signal input via the pressure-sensitive input sheet to the telephone line, The flat display section displays an image based on an information signal sent through the telephone line and received by the signal transmission / reception section, and a display for instructing a pressing operation section on the pressure-sensitive input sheet is pressed. It is designed to be displayed at the position corresponding to the copy.

Further, according to the present invention, in the above display device, the flat display portion is a display portion of a plasma addressed liquid crystal display device.

[0012]

In the display device according to the present invention, the flat display section having the transparent pressure-sensitive input sheet on the display surface section is provided for the information signal transmitted through the telephone line and received by the signal transmitting / receiving section. In addition to displaying a video based on the display, a display for instructing the pressing operation unit on the pressure-sensitive input sheet is displayed at a position corresponding to the pressing operation unit. Therefore, even if the position or shape of the pressing operation unit is changed, It is possible to properly instruct the pressing operation unit.

Further, in the above display device, when the flat display portion is used as a display portion of a plasma addressed liquid crystal display device, the flat display portion can be lightened, and the posture can be maintained and the moving operation can be performed. It will be easy.

[0014]

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

As shown in FIG. 1, the display device according to the present invention is provided with a flat display portion. The flat plate-shaped display unit includes a rectangular liquid crystal display panel 14 and a frame member 50 that supports the liquid crystal display panel 14. The frame member 50 has a front surface portion serving as an image display surface portion of the liquid crystal display panel (screen area) 14 exposed to the outside and covers a peripheral portion and a rear surface portion of the liquid crystal display panel 14.

A transparent pressure-sensitive input sheet is arranged on the display surface of the flat display section. In this pressure-sensitive input sheet, for example, as described in Japanese Patent Application Laid-Open No. 6-4748, two transparent sheets each having a transparent electrode pattern adhered thereto face each other. In this state, they are arranged close to each other and stacked.

In this pressure-sensitive input sheet, the transparent electrode patterns of the two transparent sheets are normally separated from each other. Then, when a portion of the pressure-sensitive input sheet where the transparent electrode pattern is formed is pressed, the transparent electrode patterns of the two transparent sheets are brought into contact with each other to be in a conductive state.

In this pressure-sensitive input sheet, the transparent electrode pattern is formed in a state of being divided into fine parts, and lead lines are provided outside each part. Therefore, in this pressure-sensitive input sheet, it is possible to determine which part of the pressure-sensitive input sheet is being pressed by determining which lead line is in the conductive state.

Further, in this pressure-sensitive input sheet, by treating a certain one of the plurality of lead lines as one set, a plurality of finely divided portions forming the transparent electrode pattern allows a certain area and shape. It is possible to configure one pressing operation unit having a. Further, in this pressure-sensitive input sheet, the area, shape and position of the pressing operation portion can be changed by changing which lead line is treated as one set.

By connecting the pressure-sensitive input sheet to the control circuit, the pressure-sensitive input sheet is used as an input section for inputting a signal to the control circuit according to the pressing operation on the pressing operation section.

Further, the display device has a signal transmitting / receiving section for receiving the information signal sent through the telephone line and transmitting the information signal inputted through the pressure-sensitive input sheet to the telephone line. I have it. further,
This display device includes a handset 52 and a camera 51, and can be used as a so-called videophone.

The receiver 52 has a speaker device (receiver) and a microphone device (transmitter). The camera 51 has an imaging mechanism such as a taking lens and a CCD (solid-state imaging device),
An object on the front side of the display device is imaged and converted into a video signal.

The signal transmitting / receiving unit reproduces the voice signal sent via the telephone line via the speaker device of the handset 52. Further, the signal transmitting / receiving unit sends the voice signal input via the microphone device of the handset 52 and the video signal output from the camera 51 to the telephone line.

The flat panel display section displays an image based on the information signal transmitted through the telephone line and received by the signal transmitting / receiving section as an image which is a part of the image display surface section of the liquid crystal display panel 14. It is displayed on the display unit 14a. That is, when the display device is used as a videophone, the image display unit 14a displays an image captured by the other party in the call.

Further, the flat panel display section displays a display for instructing the pressing operation section on the pressure-sensitive input sheet on the menu display section 14b which is a part of the image display surface section of the liquid crystal display panel 14. Display at the position corresponding to the section. That is, when the display device is used as a videophone, the menu display unit 1
In 4b, a display showing a numeric keypad and a hook switch necessary for operating the telephone is displayed.

In this display device, the flat plate-shaped display section is, as shown in FIGS. 1 and 2,
Even if the position or shape of the pressing operation unit is variously changed, the pressing operation unit is properly instructed. Therefore, in this display device, a large number of types of information signals are input by only changing the display content on the menu display portion 14b of the liquid crystal display panel 14 without increasing the number of pressing operation portions. be able to.

That is, regarding one pressing operation portion on the pressure-sensitive input sheet, by treating a signal output by pressing the pressing operation portion as a signal corresponding to the display content of the flat panel display portion. The one pressing operation unit can be used as a different pressing operation unit according to the change of the display content.

For example, as shown in FIGS. 1 and 2, this display device can be used as a video telephone or an information terminal device by changing the display contents on the liquid crystal display panel 14.

The information terminal device is a device for accessing an information transmitting station for transmitting various information signals via a telephone line, receiving the information signals and displaying the information signals. When this display device is used as an information terminal device, the menu display section 14b displays a display indicating a switch for selecting the type and condition of the information signal to be received.

In the display device used as the information terminal, the menu display section 14b is used.
By pressing the pressing operation unit according to the display content of, the type and condition of the information signal to be received can be selected. When this selection is made, the image display unit 14a
A video corresponding to the information signal selected by the pressing operation on the pressing operation unit is displayed on the screen.

In each of the above-mentioned display devices, the liquid crystal display panel 14 of the flat display section can be the display section of the plasma addressed liquid crystal display device, that is, the plasma addressed liquid crystal display panel 14.

This plasma addressed liquid crystal display panel 14
Is the plasma chamber and the liquid crystal layer 5 as shown in FIGS.
Are laminated to form a plasma addressed liquid crystal display device as a kind of active matrix type liquid crystal display device using plasma.
This plasma addressed liquid crystal display device is disclosed in, for example, Japanese Patent Laid-Open No. 1-217396.

This plasma addressed liquid crystal display panel 14
In FIG. 3, as shown in FIG. 3, the light from the backlight 1 serving as a light source is provided between the polarizing filter 2, the plasma chamber sandwiched between the back glass 3 and the thin glass 4, the thin glass 4 and the windshield 6. Are sequentially transmitted through the liquid crystal layer 5 encapsulated in, and led out to the outside of the front surface side through the polarization filter 7.

The light emitted outward from the backlight 1 is selectively transmitted in pixel units in the liquid crystal display structure,
By performing the cutoff control, a two-dimensional image display is performed. That is, a two-dimensional matrix is composed of transparent electrodes (ITO) 8 arranged in parallel in one direction (vertical direction in FIG. 3) and a plasma discharge pattern formed in a direction orthogonal to the arrangement direction of the transparent electrodes 8. Then, by selectively applying an electric field to the pixels in the liquid crystal layer at the intersections of the two-dimensional matrix to change the polarization direction, the light in pixel units in the liquid crystal display structure including the polarization filters 2 and 7 is changed. Transmission and blocking control can be performed.

The respective parts will be described in more detail below. The backlight 1 acts as a light source from behind the plasma addressed liquid crystal display panel 14. By controlling the brightness of the backlight 1, it is possible to control the brightness of the image display surface portion.

The polarization filter 2 passes only the light of a predetermined polarization plane among the light of the backlight 1, and the back surface of the back glass 3, that is, the backlight 1.
It is adhered to the side surface. The back glass 3 serves as a space for holding plasma, that is, as a support for the plasma chamber and has mechanical strength, and also contributes to the mechanical stability of the plasma addressed liquid crystal display panel 14.

The thin glass plate 4 facing the back glass 3 and sandwiching the plasma chamber, forms a boundary between the plasma chamber and the liquid crystal layer, is optically transparent and allows an electric field to pass therethrough, and causes plasma discharge. The electric field between the electrode formed by and the transparent electrode 8 effectively acts on the liquid crystal.

The liquid crystal layer 5 is formed by enclosing a liquid crystal material whose polarization direction is changed by an electric field between the thin glass plate 4 and the windshield 6. The windshield 6 seals the liquid crystal material and serves as a support for the transparent electrode 8.

The polarization filter 7 further polarizes the light generated by the backlight 1 and passing through the liquid crystal layer 5. The transparent electrode 8 is formed on the back surface of the windshield 6, that is, the surface on the liquid crystal layer 5 side in a stripe shape parallel to each other, and is used as one electrode for applying an electric field to the liquid crystal, and mainly ITO. It is made of an optically transparent and highly conductive material such as (indium tin oxide).

In the plasma chamber, a cathode electrode 9 and an anode electrode 10 are alternately arranged in a space formed by the back glass 3 and the thin glass plate 4 in a direction orthogonal to the arrangement direction of the transparent electrodes 8. Ribs arranged to form partition walls
Each electrode is separated by 2. The cathode electrode 9 is applied with a negative voltage when generating plasma and emits electrons. The anode electrode 10 is applied with a positive voltage when generating plasma.

In the example shown in FIG. 3, ribs 12 are formed on each anode electrode 10, and the tops of the ribs 12 are brought into contact with the back surface of the thin glass plate 4, that is, the surface on the back glass 3 side, so that the inside of the plasma chamber is covered. To function as a partition that separates the small compartment into a long and narrow chamber. This small chamber corresponds to the liquid crystal driving electrode on the plasma chamber side, and this small chamber is also called a discharge channel. An ionizable gas, such as helium, neon, or argon, or a mixed gas thereof is enclosed in the plasma chamber. When a predetermined voltage of, for example, about 300 V is applied between the cathode electrode 9 and the anode electrode 10 in a predetermined discharge channel, the gas in the discharge channel is ionized and plasma discharge is generated.

In the example shown in FIG. 3, the ribs 12 serving as partition walls are formed only on the anode electrode 10, but the ribs 12 serving as partition walls are formed on the cathode electrode 9 and the anode electrode 10, respectively. You may In this case,
A discharge channel is formed between the cathode electrode 9 and the anode electrode 10.

Here, the switch operation by plasma discharge in the plasma addressed liquid crystal display panel 14 will be further described. As shown in FIG. 4, the discharge channel in the plasma discharge state is caused by the action of the anode electrode 10 and the cathode electrode 9. A switch 11 corresponding to ON is formed, and is used for addressing the liquid crystal pixel together with the transparent electrode 8.

That is, the transparent electrode 8 and the discharge channel in the plasma chamber are used as the parallel electrodes in the row direction and the parallel electrodes in the column direction which are orthogonal to each other to form the two-dimensional matrix. Here, the inside of the discharge channel in which the plasma discharge is generated is substantially maintained at an anode potential, and when a data voltage is applied to the transparent electrode 8 in this state, a plurality of electrodes arranged in the column direction are formed corresponding to the discharge channel. A data voltage is written in the liquid crystal layer 5 of the pixel through the thin glass plate 4.

When the plasma discharge ends, the discharge channel becomes a floating potential, and the data voltage written in the liquid crystal layer 5 of each pixel is held until the next writing period, for example, after one field or one frame. That is, the discharge channel functions as a sampling switch, and the liquid crystal layer 5 of each pixel functions as a sampling capacitor.

In the example shown in FIG. 4, the pixels of the liquid crystal layer corresponding to the respective discharge channels are shown as liquid crystal pixels 5a,
Video signals S ₁ , S ₂ , S ₃ , S ₄ , S ₅ ... Are applied to the liquid crystal pixels 5 a as the data voltage via the transparent electrode 8.

A normal TFT type liquid crystal display panel uses a transparent electrode in both the row and column directions without using the above plasma.

This plasma addressed liquid crystal display panel 14
As a more detailed structure of R, as shown in FIG.
A color filter 3 that performs color display by displaying three primary colors of (red), G (green), and B (blue) is provided.

The thickness of the liquid crystal layer 5, the thickness of the thin glass plate 4, the height of the ribs 12, the arrangement pitch L _P of the anode electrodes 10, which is the width of the discharge channels, and the width L of the cathode electrode 9. _C , the width L _A of the anode electrode 10, the width L _{1 of} the transparent electrode 8 and the arrangement pitch L ₂ of the transparent electrodes 8 are predetermined lengths.

The plasma addressed liquid crystal display panel 14 is driven by the control circuit as shown in FIG.

That is, the control circuit of this display device is provided with UHF and / or V via the antenna 15.
A UHF / VHF tuner 16 that receives an HF TV broadcast signal and converts it into a baseband video signal is connected. Further, the control circuit receives a BS / CS broadcast signal via the parabolic antenna 17 to convert it into a baseband video signal, and demodulates a PCM audio signal B
The S / CS tuner 18 is connected.

The tuners 16 and 18 are connected to the AV switch 22. The AV switch 22 selects video and audio signals coming from the outputs from the tuners 16 and 18 and external inputs. The AV switch 22 is connected to the comb filter 21. The comb filter 21 performs a three-dimensional YC separation operation. The comb filter 21 is connected to the YC switch 23.

The YC switch 23 has an S input terminal (S
1, 2, 3) 24 is switched between the luminance / color signal obtained from the input and the luminance / color signal of the output of the comb filter 21. The YC switch 23 is connected to the NTSC demodulator 25.

The NTSC demodulation unit 25 demodulates the color signal on the color carrier into a color difference signal, and the frame double speed processing unit 2
Send to 6. It should be noted that this is not limited to NTSC, for example, PA
It may be an L / SECAM signal.

The frame double speed processing unit 26 converts the interlaced scanning signal into a non-interlaced signal, further doubles the scanning speed, and sends it to the aspect conversion processing unit 27.

The aspect conversion processing section 27 performs aspect conversion processing such as zooming together with the image memory 28, further performs conversion of the display state of the screen such as zoom mode, and sends it to the HD / NTSC switch 29.

The video input terminals (videos 1, 2, 3) 19 connected to the AV switch 20 are connected to the NTS.
A normal type composite video signal such as C / PAL is supplied.
Further, the S input terminals (S1, 2, 3) 24 connected to the YC switch 23 are supplied with a video signal having separate luminance and color signals. Then, the comb filter 2
A YC output terminal 22 is connected to 1. This YC
The output of the comb filter 21 is supplied to the output terminal 22 for use in an external recording device or the like.

The HD / NTSC switch 29 has an H
The DTV input terminal 30 is connected. The HDTV input terminal 30 has a so-called MUSE system or MPEG.
A high-definition video signal obtained by decoding a digital video signal encoded by 2 or the like is supplied.

The HD / NTSC switch 29 selects the above-mentioned high-quality signal and the normal signal, and the color signal conversion processing section 31.
Send to The color signal conversion processing unit 31 adjusts the color saturation, hue, etc., and sends it to the A / D converter 32. The A / D converter 32 converts an analog video signal into a digital signal.

The liquid crystal driver 34 supplied with a signal from the A / D converter 32 drives the side of the PALC panel where the conductive film such as the transparent electrode (ITO) 8 is provided.
Further, the liquid crystal control unit 35 generates a liquid crystal drive signal based on the synchronization signal and supplies it to the gamma correction unit 36 and the plasma driver 37.

The gamma correction section 36 performs gamma correction suitable for the liquid crystal panel. Further, the plasma driver 37
Drives the side of the PALC panel where the plasma switch is located. The plasma driver 37 requires a voltage of about 400V. This is because a high voltage is required to make the electric field applied to the liquid crystal material constant due to the thickness of glass or the like.

The plasma-addressed liquid crystal display panel 14 connected to the liquid crystal driver 34 and the plasma driver 37 has the above-described structure and actually displays an image.

The backlight adjusting section 38 adjusts the screen brightness and the like by controlling the amount of light generated by the backlight 1. The screen display unit 39 displays characters / symbols such as a reception channel number, volume display, and menu display. The power supply unit 40 is supplied with power via a power supply plug 41, and generates various necessary voltages by a configuration such as a switching power supply.

The audio processing section 42 uses the AV switch 20.
Process the audio signal from, to set the volume, sound quality and sound field, and send it to the audio output unit 43. The audio output unit 43 amplifies audio power and supplies the amplified audio power to the speakers 44, 45, and 46. The speakers 44, 45, 46 convert electric signals into sound waves.

In this display device, the flat display portion is the display portion of the plasma addressed liquid crystal display device,
That is, by using the plasma addressed liquid crystal display panel 14 as described above, it is possible to reduce the weight of each of the flat panel display portions, and it is possible to reduce the weight of the entire device.

In this display device, the control circuit section can be integrally provided on the flat panel display section. In this case, it is possible to reduce the wiring between the flat display unit and the outside and install the flat display unit.

Further, in this display device,
The control circuit section may be arranged apart from the flat panel display section. In this case, the control circuit section may be arranged in a separate room from the installation room in which the flat panel display section is installed. The signal transmission from the control circuit unit to the flat panel display unit may be based on any of a wired system (a system performed through a signal cable) and a wireless system (a system performed by radio waves).

When the flat panel display section and the control circuit section are separately provided in this manner, the weight around the flat panel display section can be further reduced and the control can be achieved. Remote operation can be easily performed via the circuit unit.

[0069]

As described above, in the display device according to the present invention, the flat-panel display section having the transparent pressure-sensitive input sheet on the display surface section is sent via the telephone line and the signal transmitting / receiving section is provided. The image based on the information signal received by is displayed, and a display for instructing the pressing operation unit on the pressure-sensitive input sheet is displayed at a position corresponding to the pressing operation unit.

Therefore, in this display device, the flat display section can appropriately instruct the pressing operation section even if the position and shape of the pressing operation section are changed.

Therefore, in this display device, it is possible to input a large number of types of information signals without increasing the number of pressing operation portions.

Further, in the above display device, when the flat display portion is used as the display portion of the plasma addressed liquid crystal display device, the flat display portion can be made light in weight, and the posture can be maintained and the moving operation can be performed. Can be easy.

That is, the present invention is a display device configured as a video telephone, the device configuration is reduced in size and weight, and selection of an installation site, movement of the installation site, storage, and transportation are facilitated. Further, it is possible to provide a display device in which the direction of each display unit can be easily changed according to the usage state and the operation is facilitated.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a display device according to the present invention functions as a videophone.

FIG. 2 is a front view showing a state in which the display device functions as an information search terminal.

FIG. 3 is an enlarged exploded perspective view of an essential part showing a configuration of a flat-panel display portion of the display device.

FIG. 4 is a side view schematically showing the configuration and operating principle of the flat display unit.

FIG. 5 is an enlarged perspective view of an essential part showing the configuration of the flat display unit.

FIG. 6 is a block diagram showing a configuration of a plasma addressed liquid crystal display device in the display device.

[Explanation of symbols]

14 screen area (plasma address liquid crystal display panel) 14a image display section 14b menu display section 50 housing section 51 camera 52 handset

Front page continuation (72) Inventor Kazumi Isono 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (2)

[Claims] 1. A flat panel display unit, a transparent pressure-sensitive input sheet disposed on a display surface of the flat panel display unit, and an information signal transmitted via a telephone line, and the pressure-sensitive unit. A signal transmitting / receiving unit for transmitting an information signal input via an input sheet to the telephone line, wherein the flat display unit is information transmitted via the telephone line and received by the signal transmitting / receiving unit. A display device configured to display an image based on a signal and to display a display for instructing a pressing operation unit on the pressure-sensitive input sheet at a position corresponding to the pressing operation unit. 2. The display device according to claim 1, wherein the flat display portion is a display portion of a plasma addressed liquid crystal display device.