JP2014165122A - Inorganic EL panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple-structured inorganic EL panel having a function as a touch panel and having a small number of components.SOLUTION: An inorganic EL panel has such a configuration that first and second electrodes 3 and 4 sandwich a display pattern layer 5, a phosphor layer 6 and the like. First division electrodes 3a and 3b of the first electrode and second division electrodes 4a and 4b of the second electrode crossing each other configure matrix-like division regions (1) to (4). Pressing detectors 11-14 detect change in voltage at resistors R connected to the respective division electrodes. An AC power supply 10 drives both electrodes, and a detection controller 20 selects a combination of the pressing detectors by control signals G. A coordinate detector 25 compares inputted detection signals O of the pressing detectors with data to determine the pressed division region.

Description

  The present invention relates to an inorganic EL panel, and more particularly to an inorganic EL panel having a simple structure in which the inorganic EL panel itself, which is a display or light emitting element, has a function as a touch panel device, and has a small number of parts and assembly man-hours. .

  In general, an inorganic EL panel has a multilayer structure in which a phosphor layer, a dielectric layer, etc. are sandwiched between a pair of facing planar electrodes, at least one of which has translucency, and a pair of drive power supplies An AC electric field is applied between the electrodes, and the phosphor layer is excited to emit light through the dielectric layer to obtain a desired light emitting display.

  Patent Document 1 listed below discloses an invention of a touch-input type liquid crystal display device that can prevent background reflection by satin processing and suppress glare of a display screen. This liquid crystal display device has a structure in which a transparent touch panel is provided on the front surface of the liquid crystal display, the front surface of the outermost plate of the transparent touch panel is the first matte treatment surface, and the space between the outermost plate of the transparent touch panel and the liquid crystal display. At least one of the air contact surfaces (excluding the surface of the transparent conductive film) existing in the surface is used as a second textured surface.

JP 2000-241793 A

  According to the invention of the touch input type liquid crystal display device disclosed in Patent Document 1, it is composed of two components: a touch panel portion that is an input device by contact and a liquid crystal panel portion as a light emitter or a display portion. Therefore, there are many parts, and when the touch panel part and the liquid crystal panel part are laminated together, facilities such as a clean room are necessary so that dust does not enter between them, and a sealing process needs to be added after pasting There was a lot of trouble in the production process.

  The present invention has been made to solve the problems in the conventional technology described above, and by adding a function as a touch panel device to the inorganic EL panel itself as a display or light emitting element, the number of parts and the number of assembly steps are achieved. An object of the present invention is to provide an inorganic EL panel having a simple structure with a small amount of.

The inorganic EL panel according to claim 1 is:
An inorganic EL panel in which an insulating display pattern layer and a phosphor layer are laminated between a pair of electrodes, at least one of which has translucency,
A first electrode composed of a plurality of first divided electrodes divided in a first direction;
A second electrode composed of a plurality of second divided electrodes divided so as to be arranged in a second direction intersecting the first direction;
An insulating display pattern layer provided between the first electrode and the second electrode;
A phosphor layer provided between the first electrode or the second electrode and the display pattern layer;
AC power supply connected between each first divided electrode and each second divided electrode;
A plurality of resistors respectively provided between the first divided electrodes and the second divided electrodes and the AC power source;
A plurality of pressure detection units provided for each of the resistors, and detecting a change in voltage flowing through the resistors and outputting a detection signal;
A detection control unit that outputs a detection signal from each of the press detection units by sequentially outputting a control signal in a predetermined combination to each of the press detection units;
A coordinate detection unit for determining which position is pressed in the coordinates formed by the first electrode and the second electrode from a combination of detection signals detected by the respective press detection units under the control of the detection control unit;
It is characterized by having.

  When the inorganic EL panel described in claim 1 is lit, an alternating current is applied between each first divided electrode of the first electrode and each second divided electrode of the second electrode by an alternating current power source. Of the phosphor layer sandwiched between the first electrode and the second electrode, only the portion corresponding to the display pattern provided with conductivity in the insulating display pattern layer receives voltage and emits light. The light emission of the display pattern by the body layer can be observed through the first electrode or the second electrode having translucency.

  The display surface of the inorganic EL panel is divided into a plurality of regions by a first divided electrode of the first electrode and a second divided electrode of the second electrode divided along a direction intersecting each other, and is configured in a matrix shape. Yes. These individual areas are called divided areas. When the user touches the display surface with a finger or the like, a part of the phosphor layer corresponding to the touched divided area is pressed, the thickness is temporarily reduced, and the resistance value is reduced. Since the AC voltage of the AC power supply is constant, the value of current flowing through the first and second divided electrodes corresponding to the divided region increases as the resistance value of the phosphor layer in the divided region decreases. As a result, the voltage generated at the resistor connected to the first divided electrode and the voltage generated at the resistor connected to the second divided electrode both increase. If the other divided regions are not pressed, the voltage generated in the resistors connected to the other first divided electrodes and the second divided electrodes does not change.

  When this inorganic EL panel is driven by an AC power source, when a user touches a specific divided area on the display surface, the specific divided areas respectively connected to the first divided electrode and the second divided electrode corresponding to the divided area. The resistance changes the voltage. The press detection unit can detect a change in the voltage and output a detection signal. On the other hand, the detection control unit scans the press detection units in a predetermined combination in order and in a predetermined cycle while being driven by the AC power source. The detection signal output by each pressing detection unit is input to the coordinate detection unit. Then, the coordinate detection unit determines which divided region is pressed in the coordinates formed in the display surface by the first electrode and the second electrode, from the combination of the detection signals input from the press detection unit.

  As described above, according to the inorganic EL panel of the present invention, an AC power source for light emission display is used to detect a voltage change in each resistor that also functions as a current limiting resistor for the first electrode and the second electrode. By doing so, it is possible to determine which position on the display surface has been pressed.

  Further, in the pressed divided area, a part of the phosphor layer is pressed and thinned so that the resistance value decreases, but since the AC voltage of the AC power source is constant, the current value increases. The light emission luminance of the divided area increases. In other words, the pressed divided area can be accurately determined by the coordinate detection unit, and the pressed divided area emits light more brightly than the surrounding area, thereby visually confirming the pressing of the divided area. Can do.

It is the structure and wiring diagram which mainly showed the laminated structure, such as an electrode and a fluorescent substance layer, in the panel part of the inorganic EL panel which concerns on embodiment of this invention, and the connection structure of a panel part and a drive power supply. It is the circuit diagram which mainly showed the matrix structure of the panel part in the inorganic EL panel, and the structure of the control part. It is a circuit diagram of the press detection part in the same inorganic EL panel. It is a drive timing diagram in the same inorganic EL panel. In the same inorganic EL panel, the data used when the coordinate detection unit determines whether or not there is a pressure in the divided area, a combination of a plurality of types of detection signals of the pressure detection unit, and whether or not the divided area is pressed or pressed It is a table | surface figure which matched the kind of division area in the case in a table format.

  The inorganic EL panel 1 according to the first embodiment will be described with reference to FIGS. The inorganic EL panel 1 of this embodiment includes a panel unit 2 that is a display unit, and a control unit 30 including a drive source. And according to this inorganic EL panel 1, the panel part 2 which is a display part also serves as a touch panel, and when a user touches the display image etc. which were displayed on the specific position of the panel part 2, it will be in the said specific position. It can be detected that there has been contact.

First, with reference to FIG.1 and FIG.2, the structure of the panel part 2 which is a display part of the inorganic EL panel 1 is demonstrated.
The panel part 2 of this embodiment is a dispersive inorganic panel. As shown in FIG. 1, the panel unit 2 includes a first electrode 3 on the front side and a second electrode 4 on the back side, which are a pair of electrodes facing each other at a predetermined interval. Between these first and second electrodes 3 and 4, in order from the front side, an insulating display pattern layer 5 for partitioning a light emitting pattern, a phosphor layer 6 as a light emitting layer, and an insulating layer. A dielectric layer 7 is disposed, and the pair of electrodes 3, 4 and the layers 5, 6, 7 are laminated together to form a panel-like or sheet-like light emitting device as a whole. Moreover, the panel part 2 which consists of these each layer is covered with the transparent protective layer 8 in order to improve the durability at the time of use. The protective layer 8 is formed by covering the entire panel portion 2 with an adhesive transparent resin film or the like, and thermocompressing it.

  The 1st electrode 3 used as the front side of the panel part 2 comprises a pair of substantially planar electrodes which mutually oppose the 2nd electrode 4 of the back side. The 1st electrode 3 consists of a transparent conductive film which has a light transmittance, and the light of the fluorescent substance layer 6 mentioned later permeate | transmits and is irradiated to the front side. Examples of the transparent conductive film include light transmissive conductive materials such as ITO (indium tin oxide) and conductive polymers.

  The 2nd electrode 4 used as the back side of the panel part 2 consists of metal plates or metal foils, such as an aluminum alloy and a stainless alloy, for example. Further, the second electrode 4 may be a thin film such as Al or Ag. Further, as the second electrode 4, a transparent conductive film similar to the first electrode 3 may be used. The second electrode 4 may be a metal plate, a metal foil or the like that easily reflects light. In that case, part of the light emitted from the phosphor layer 6 is reflected by the second electrode 4, travels toward the display pattern layer 5 and the first electrode 3, passes through these layers, and is emitted to the outside. .

  As shown in FIG. 2, the first electrode 3 on the front side is divided into two first divided electrodes 3a and 3b along the X direction (first direction) of the coordinate axis shown in FIG. The 1-divided electrodes 3a and 3b are arranged side by side in the X direction with a minute interval. Further, the second electrode 4 on the back side is divided into two second divided electrodes 4a and 4b along the Y direction (second direction) orthogonal to the X direction of the coordinate axis shown in FIG. The two-divided electrodes 4a and 4b are arranged side by side in the Y direction at a minute interval. Accordingly, the first divided electrodes 3a and 3b of the first electrode 3 and the second divided electrodes 4a and 4b of the second electrode 4 are viewed from the viewing direction of the panel unit 2 orthogonal to the XY plane of the coordinate axis. As seen, they are arranged so as to cross each other in a matrix, and constitute four divided regions (1), (2), (3), (4). In FIG. 2, the numbers (1), (2), (3), and (4) of the four divided areas are omitted in parentheses. Although details will be described later, when the panel unit 2 functions as a touch panel, this divided area is a minimum range that can be individually identified as a contact position. In the embodiment, since the first electrode 3 and the second electrode 4 are divided into two divided electrodes 3a, 3b and 4a, 4b, respectively, there are four divided regions where the contacted position can be identified. Of course, if each electrode is divided into three divided electrodes, the number of divided regions becomes nine. Further, the number of divided regions may be increased by increasing the number of divided electrodes.

  A display pattern layer 5 is provided on the lower surface of the first electrode 3. The display pattern layer 5 is made of an insulator (dielectric), and an insulating layer on which a desired display pattern is formed by permeation of a display pattern forming liquid containing a dielectric or conductor having a dielectric constant larger than that of the display pattern layer 5. However, as will be described later, this is a layer that defines the light emission pattern of the light emitting layer disposed below this layer. The display pattern can be created by forming an image using a penetrating liquid on the display pattern layer 5 (paper or the like) by a desired method.

  The display pattern layer 5 is preferably made of a low dielectric constant material having a dielectric constant of less than 5, for example, plain paper, recycled paper, Japanese paper, etc. can be used, and if the dielectric constant is similar to that of paper, Resin fiber woven fabric, resin fiber non-woven fabric, and resin mesh can also be used. Further, a porous material such as a porous resin film, which is a low dielectric constant insulator (dielectric) and has a large number of pores through which the permeating liquid can permeate, may be used.

  As the penetrating liquid used for forming the display pattern, a liquid that is a conductor can be used. Specifically, water that is not pure water such as soapy water, a mixed solution of soapy water and glycerin, a water-based ink, an emulsion ink, a conductive ink, or the like can be used as the penetrating liquid. In addition, a dielectric having a dielectric constant larger than that of the display pattern layer 59 can be used as the penetrating liquid.

  When viewed from the front-side first electrode 3 side, a phosphor layer 6 that is a light-emitting layer is provided below the display pattern layer 5. The phosphor layer 6 contains a phosphor, and when an AC voltage is applied between the first electrode 3 and the second electrode 4, a portion corresponding to the display pattern formed on the display pattern layer 5 emits light. To do.

  The phosphor layer 6 can be formed by forming a dielectric layer 7 on the upper surface of the second electrode 4, applying a phosphor paste thereon, and drying. The phosphor paste can be applied by, for example, a screen printing method. The phosphor layer 6 is formed to a thickness of about 40 to 60 μm, for example. The phosphor layer 6 is translucent.

  The phosphor paste is obtained by dispersing phosphor particles in a binder. The phosphor is obtained by adding a small amount of a luminescent center element to an inorganic composition as a base material. As the inorganic composition, ZnS, CaS or the like is used. As the luminescent center element, for example, a metal element such as Cu or Mn is used. The emission color of the phosphor layer 6 is determined by the combination of the inorganic composition and the emission center element.

  The dielectric layer 7 is a short-circuit preventing layer between the first and second electrodes 3 and 4, and also functions as an adhesion layer (adhesive layer) for integrating the upper and lower layers, as described above. Since a part of the light emitted from the phosphor layer 6 is reflected by the second electrode 4 and irradiated to the first electrode 3 side, the dielectric layer 7 also has light transmittance.

Next, with reference to FIGS. 2 to 5, the control unit 30 that causes the panel unit 2 described above to be driven to emit light and function as a touch panel will be described.
As shown in FIG. 2, an AC power supply 10 is connected between the first divided electrodes 3 a and 3 b of the first electrode 3 and the second divided electrodes 4 a and 4 b of the second electrode 4. Further, resistors R are respectively provided between the first divided electrodes 3 a and 3 b and the second divided electrodes 4 a and 4 b and the AC power supply 10. The resistor R has a function of limiting the current flowing between the first electrode 3 and the second electrode 4 when the panel unit 2 is driven to emit light, and will be described later in detail, but also functions as a touch panel. In FIG. 4, the sensor also has a function as a detection resistor for detecting that a specific divided area is pressed.

  As shown in FIG. 2, each of the resistors R is provided with press detection units 11, 12, 13, and 14 that detect a current flowing through each resistor R as a change in voltage and output a detection signal. As shown in FIG. 3, the press detection units 11, 12, 13, and 14 include a current-voltage converter 15 that converts the current flowing through the resistor R into a voltage as representatively shown in the structure of the press detection unit 11. ing. The current-voltage converter 15 is controlled to function or stop functioning according to a control signal G given from a detection control unit 20 described later. The voltage signal output from the current-voltage converter 15 is supplied to the comparator 16 and compared with a predetermined reference voltage. The voltage value of the reference voltage is set to a voltage value generated in the resistor R when the divided region of the panel unit 2 corresponding to the press detection unit 11 and the resistor R is not pressed. Accordingly, when the voltage signal exceeds the reference voltage, that is, when it is considered that there is a change (increase) in voltage exceeding the predetermined threshold value in the resistor R, the comparator 16 outputs the detection signal O to the coordinate detection unit 25 described later. Output to.

  As shown in FIG. 3, the reference voltage to be compared with the voltage signal in the comparator 16 is given by a capacitor 19 connected to a comparison voltage terminal 18 via a resistor 17 or the like. The output side of the current / voltage converter 15 is connected to the capacitor 19 via a switch 21. When necessary, the current / voltage converter 15 is given a control signal G to function, and an operation panel (not shown) or the like is connected. By applying the selection signal Sel to the switch 21 by operation and closing the contact (position indicated by a solid line in FIG. 3), the electric charge sufficient to generate the necessary reference voltage described above can be stored in the capacitor 19. .

  The timing at which the switch 21 is closed and the necessary charge is accumulated in the capacitor 19 is set when the AC power supply 10 is turned on (starting up) in order to use the inorganic EL panel 1 or when the panel unit 2 is used. It is conceivable that the value of the current flowing through the circuit changes due to deterioration of the dielectric layer 7 or the like, or that the charge of the capacitor 19 is discharged for some reason and a desired reference voltage cannot be obtained.

As shown in FIG. 2, the control unit 30 outputs the control signals G (G _X1 , G _X2 , G _y1 , G _y2 ) to the press detection units 11 to 14, respectively. A detection control unit 20 for outputting detection signals O (O _X1 , O _X2 , O _y1 , O _y2 ) from 11 to 14 is provided. The detection control unit 20 includes two press detection units 11 and 12 connected to the two first divided electrodes 3 a and 3 b of the first electrode 3, and two second divided electrodes 4 a and 4 b of the second electrode 4. The control signal G is sequentially output at a predetermined cycle with respect to the combination of the four types of press detection units by the two press detection units 13 and 14 connected to. Accordingly, the divided regions (1) to (4) are provided for each combination of the first divided electrodes 3a and 3b and the second divided electrodes 4a and 4b corresponding to the four divided regions (1) to (4) of the panel unit 2. The presence / absence of a detection signal O (O _X1 , O _X2 , O _y1 , O _y2 ) indicating whether or not there has been a pressure on can be periodically checked.

With reference to the timing chart of FIG. 4, control of the press detection parts 11-14 by the detection control part 20 mentioned above is demonstrated.
The detection control unit 20 sets two times corresponding to each of the divided areas (1) to (4), with one cycle corresponding to the number of divided areas (1) to (4) (4 in this embodiment). A control signal G is output to each pressing detection unit. In the detection time of the divided area (1), the divided area (1) is constituted by the first divided electrode 3a and the second divided electrode 4a, and therefore the press detection unit 11 connected to the first divided electrode 3a. Is _supplied with a control signal G _X1 and a control signal G _y1 is applied to the pressure detection unit 13 connected to the second divided electrode 4a. If there is an operator's contact in the divided area (1) at this time, and the divided area (1) is turned ON, as indicated by the broken line at the same position in FIG. The detection signal O _X1 is output, and the detection signal O _y1 is output from the press detection unit 13.

Similarly, in the detection time of the divided region (2), it is the first divided electrode 3b and the second divided electrode 4a that constitute the divided region (2), so the pressure connected to the first divided electrode 3b The control signal G _X2 is given to the detection unit 12, and the control signal G _y1 is given to the press detection unit 13 connected to the second divided electrode 4a. If there is an operator's contact in the divided area (2) at this time, the detection signal O _X2 is output from the pressure detection unit 12 and the pressure is detected as indicated by the broken line at the same position in FIG. The detection signal O _y1 is output from the unit 13.

Similarly, in the detection time of the divided region (3), it is the first divided electrode 3a and the second divided electrode 4b that constitute the divided region (3), so the pressure connected to the first divided electrode 3a A control signal G _X1 is given to the detection unit 11, and a control signal G _y2 is given to the press detection unit 14 connected to the second divided electrode 4b. If there is an operator's contact in the divided area (3) at this time, the detection signal O _X1 is output from the pressure detection unit 11 as indicated by the broken line at the same position in FIG. The detection signal O _y2 is output from the unit 14.

Similarly, in the detection time of the divided region (4), it is the first divided electrode 3b and the second divided electrode 4b that constitute the divided region (4), so the pressure connected to the first divided electrode 3b The control signal G _X2 is given to the detection unit 12, and the control signal G _y2 is given to the press detection unit 14 connected to the second divided electrode 4b. If there is an operator's contact in the divided area (4) at this time, the detection signal O _X2 is output from the pressure detection unit 12 as shown by the broken line at the same position in FIG. The detection signal O _y2 is output from the unit 14.

According to the timing chart of FIG. 4, as indicated by “initial value setting” in the figure, initial values are set when the apparatus is started, which is the first stage of the time axis. This is an operation for generating a reference voltage by charging the capacitor 19 of the press detection units 11 to 14 described above with a necessary charge. That is, the selection signal Sel and the control signals G _X1 , G _X2 , G _y1 , G _y2 are given to all the press detection units 11 to 14 by an operation from a control panel (not shown). As a result, in each of the press detection units 11 to 14, direct current is supplied from the current-voltage converter 15, and the contact of the switch 21 is closed to accumulate necessary charges in the capacitor 19.

As shown in FIG. 2, the control unit 30 is provided with a coordinate detection unit 25. The coordinate detection unit 25 presses any divided area in the panel unit 2 from the combination of the detection signals O _X1 , O _X2 , O _y1 , O _y2 detected by the press detection units 11 to 14 under the control of the detection control unit 20. Judge whether it was done. That is, when the inorganic EL panel 1 is driven to emit light, the detection control unit 20 controls the press detection units 11 to 14 with the control signals G _X1 , G _X2 , G _y1 , and G _y2 . When the detection signals O _X1 , O _X2 , O _y1 , and O _y2 are output, the detection signals O _X1 , O _X2 , O _y1 , and O _y2 are input to the coordinate detection unit 25. The coordinate detection unit 25 includes a storage unit that stores data as shown in FIG. This data includes a combination of a plurality of types of outputs of the detection signals O _X1 , O _X2 , O _y1 , O _y2 of the press detection units 11 to 14 (1 is output, 0 is not same), and presence / absence of pressing of divided areas Or it is the table data which matched the number (area | region column) of the division area at the time of being pressed. The coordinate detection unit 25 collates the detection signals O _X1 , O _X2 , O _y1 , and O _y2 input from the press detection units 11 to 14 with the table data in FIG. It can be determined whether it has been pressed, or which of the divided areas has not been pressed. The determination result may be displayed on a display unit (not shown) or may be output by other notification means.

Next, the effect | action of the inorganic EL panel 1 in the structure demonstrated above is demonstrated.
When the inorganic EL panel 1 is turned on, the switch of the AC power supply 10 is turned on by operating an operation panel (not shown), and each of the first divided electrodes 3a and 3b and the second electrode 4 of the first electrode 3 is turned on. An AC voltage is applied between the second divided electrodes 4a and 4b. Of the phosphor layer 6 sandwiched between the first electrode 3 and the second electrode 4, only the portion of the insulating display pattern layer 5 corresponding to the display pattern provided with conductivity emits light. Light emission corresponding to the display pattern of the phosphor layer 6 can be observed through the first electrode 3 or the second electrode 4 having translucency.

  When the user touches the display surface of the inorganic EL panel 1 with a finger or the like, a part of the phosphor layer 6 corresponding to the touched divided region is pressed, the thickness is temporarily reduced, and the resistance value is reduced. Since the AC voltage of the AC power supply 10 is constant, the first divided electrode 3a or 3b and the second divided electrode 4a or 4b corresponding to the divided region are reduced by decreasing the resistance value of the phosphor layer 6 in the divided region. The value of the current flowing through increases. As a result, the voltage generated in the resistor R connected to the first divided electrode 3a or 3b and the voltage generated in the resistor R connected to the second divided electrode 4a or 4b both increase. If no other divided region is pressed, no change occurs in the voltage generated in the resistor R connected to the other first divided electrode and the second divided electrode. If the user's finger or the like moves away from the display surface, the shape of the phosphor layer 6 in the divided area touched is restored elastically, the thickness returns to the original value, and the resistance value also returns to the original value.

For example, a case where the operator touches the divided area (1) during driving will be described with reference to FIG. In the detection time of the divided region (1) in one cycle of scanning in FIG. 4, the detection control unit 20 gives the control signal G _X1 to the press detection unit 11 connected to the first divided electrode 3a and the second divided electrode. A control signal G _y1 is given to the pressure detection unit 13 connected to 4a. If the operator touches the divided area (1) at this time, the detection signals O _X1 are output from the pressure detection units 11 to 14 as shown by the broken lines at the same positions in FIG. A detection signal O _y1 is output from the detection unit 13.

The detection signals O _X1 and O _y1 are input to the coordinate detection unit 25. The coordinate detection unit 25 applies the case where the detection signals O _X1 and O _y1 are output at the same time to the table data shown in FIG. 5, and as a result, the divided region (1) is pressed because it corresponds to the combination of the second row from the top. Judge that it was done. The same determination is made when other divided areas are pressed.

  Thus, according to the inorganic EL panel 1 of the present embodiment, the voltage is applied to each resistor R that also functions as a current limiting resistor for the first electrode 3 and the second electrode 4 using the AC power supply 10 for light emitting display. It is possible to determine which divided area of the display surface has been pressed by detecting the change in the pressure by the pressure detection units 11 to 14.

  Further, in the pressed divided region, a part of the phosphor layer 6 is pressed and becomes thin, so that the resistance value decreases. However, since the AC voltage of the AC power supply 10 is constant, the current value increases, and as a result. As shown in FIG. That is, the pushed divided area can be accurately determined by the coordinate detection unit 25, and if the pushed divided area is a light emitting portion, the portion emits light more brightly than the surrounding light emitting portions. The pressing of the divided area can be confirmed visually.

  As described above, according to the inorganic EL panel 1 of the present embodiment, the first electrode 3 and the second electrode 4 for driving light emission can be shared with the detection electrode for contact detection on the touch panel. There is no need to provide it. Further, the pressure detection resistor R can be shared with a current limiting resistor. Therefore, according to the present embodiment, the number of parts does not increase compared to the conventional case.

  In addition, according to the inorganic EL panel 1 of the present embodiment, unlike the conventional two-layer structure composed of the light emitting part and the touch panel part, it can be composed of only one layer of the inorganic EL panel that is the light emitting part. It can be made thinner than the panel.

  Furthermore, according to the inorganic EL panel 1 of the present embodiment, by dividing the electrode, it is possible to cut off the low impedance effect (parallel connection) of the light emitting part, and the influence on the non-light emitting part. Therefore, power consumption can be reduced. Furthermore, analog pressure detection is possible from the pressure and current change due to the structure.

  In addition, according to the inorganic EL panel 1 of the present embodiment, the current-voltage converter 15 of the press detection units 11 to 14 is connected from the detection control unit 20 in order to cause the press detection units 11 to 14 to output the detection signal O. The control signal G is controlled so as to operate only at a necessary timing. However, the current-voltage converter 15 of the press detection units 11 to 14 is always operated, and is controlled so that the output of the comparator 16 is turned on only at a necessary timing by the control signal G from the detection control unit 20. It is good to do.

DESCRIPTION OF SYMBOLS 1 ... Inorganic EL panel 2 ... Panel part 3 ... 1st electrode 3a, 3b ... 1st divided electrode 4 ... 2nd electrode 4a, 4b ... 2nd divided electrode 6 ... Phosphor layer 10 ... AC power supply 11-14 ... Pressure detection part 20 ... detection control unit 25 ... coordinate detecting section 30 ... control unit _{O, O X1, O X2,} O y1, O y2 ... detection signals _{G, G X1, G X2,} G y1, G y2 ... control signal R ... resistance

Claims (1)

An inorganic EL panel in which an insulating display pattern layer and a phosphor layer are laminated between a pair of electrodes, at least one of which has translucency,
A first electrode composed of a plurality of first divided electrodes divided in a first direction;
A second electrode composed of a plurality of second divided electrodes divided so as to be arranged in a second direction intersecting the first direction;
An insulating display pattern layer provided between the first electrode and the second electrode;
A phosphor layer provided between the first electrode or the second electrode and the display pattern layer;
AC power supply connected between each first divided electrode and each second divided electrode;
A plurality of resistors respectively provided between the first divided electrodes and the second divided electrodes and the AC power source;
A plurality of pressure detection units provided for each of the resistors, and detecting a change in voltage flowing through the resistors and outputting a detection signal;
A detection control unit that outputs a detection signal from each of the press detection units by sequentially outputting a control signal in a predetermined combination to each of the press detection units;
A coordinate detection unit for determining which position is pressed in the coordinates formed by the first electrode and the second electrode from a combination of detection signals detected by the respective press detection units under the control of the detection control unit;
An inorganic EL panel comprising:

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