WO2017068891A1 - Dispositif d'affichage à fonction de détection de pression - Google Patents

Dispositif d'affichage à fonction de détection de pression Download PDF

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Publication number
WO2017068891A1
WO2017068891A1 PCT/JP2016/076935 JP2016076935W WO2017068891A1 WO 2017068891 A1 WO2017068891 A1 WO 2017068891A1 JP 2016076935 W JP2016076935 W JP 2016076935W WO 2017068891 A1 WO2017068891 A1 WO 2017068891A1
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WO
WIPO (PCT)
Prior art keywords
display device
liquid crystal
crystal display
electrode
upper electrode
Prior art date
Application number
PCT/JP2016/076935
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English (en)
Japanese (ja)
Inventor
敦夫 井上
裕次 渡津
裕孝 阪井
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日本写真印刷株式会社
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Publication of WO2017068891A1 publication Critical patent/WO2017068891A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the present invention relates to a display device with a press detection function for detecting stress using a capacitive touch panel.
  • the methods (A) and (B) involve the deformation of the structure disposed on the upper part of the display, and thus there is a problem that the display image is distorted due to Newton rings or the like.
  • examples of elastic bodies having good distortion characteristics include a body, but there is a problem that the visibility of display images is hindered because it causes a decrease in light transmittance and an increase in haze value. .
  • an object of the present invention is to provide a display device with a press detection function that solves the above-described problems and that does not disturb the display image when pressed and has good visibility of the display image.
  • the present invention is configured as follows.
  • a liquid crystal display device having a cover glass plate on the top
  • the liquid crystal display device has a frame-like wall portion that supports the periphery of the cover glass plate of the liquid crystal display device and supports the liquid crystal display device, and a flat bottom portion that is opposed to the bottom surface of the liquid crystal display device.
  • a liquid crystal display device storage section constituting a storage space for storing the display device;
  • the row electrode is composed of a lower electrode that is disposed at the bottom of the liquid crystal display device storage portion and includes a plurality of row electrodes and a plurality of column electrodes, and an upper electrode provided in the liquid crystal display device.
  • a capacitance-type press detection device that detects a pressing force based on a change in capacitance between the column electrode and the column electrode.
  • a liquid crystal display device having a cover glass plate on the top
  • the liquid crystal display device has a frame-like wall portion that supports the periphery of the cover glass plate of the liquid crystal display device and supports the liquid crystal display device, and a flat bottom portion that is opposed to the bottom surface of the liquid crystal display device.
  • a liquid crystal display device storage section constituting a storage space for storing the display device;
  • a lower electrode disposed on the bottom of the liquid crystal display device storage portion and an upper electrode provided on the liquid crystal display device, the capacitance change between the lower electrode and the upper electrode
  • a display device with a pressure detection function comprising a capacitance type pressure detection device for detecting a pressing force based on the capacitance.
  • the press detection device since the press detection device is incorporated in the portion inside the display unit of the liquid crystal display device, the pressing force transmitted from the cover glass plate to the liquid crystal display device when the cover glass plate is pressed.
  • the capacitance changes between the electrodes, and the pressing force can be detected by the pressing detection device based on the change. Therefore, the visibility of the display image is not impaired.
  • FIG. 1 It is a longitudinal cross-sectional view of the display apparatus with a press detection function concerning embodiment of this invention. It is a disassembled perspective view of the display apparatus with a press detection function of FIG. It is a circuit diagram when the TFT electrode of the display device with a pressure detection function in FIG. 1 functions as an original liquid crystal electrode. It is a circuit diagram when the TFT electrode of the display device with a pressure detection function of FIG. 1 functions as an upper electrode of the capacitance type pressure detection device. It is explanatory drawing which shows the example of the electric field line between adjacent row electrodes and column electrodes. It is explanatory drawing, such as an upper electrode and a lower electrode of the press detection apparatus of the display apparatus with a press detection function of FIG. 1 concerning the modification of embodiment of this invention.
  • FIG. 1 It is a longitudinal cross-sectional view of the display apparatus with a press detection function of FIG. 1 concerning another modification of embodiment of this invention. It is a longitudinal cross-sectional view of the display apparatus with a press detection function of FIG. 1 concerning the 1st modification of embodiment of this invention. It is a longitudinal cross-sectional view of the display apparatus with a press detection function of FIG. 1 concerning the 2nd modification of embodiment of this invention. It is a longitudinal cross-sectional view of the display apparatus with a press detection function of FIG. 1 concerning the 3rd modification of embodiment of this invention. It is a longitudinal cross-sectional view of the display apparatus with a press detection function of FIG. 1 concerning the 4th modification of embodiment of this invention.
  • the display device 40 with a pressure detection function includes a liquid crystal display device 5, a liquid crystal display device housing portion 6, and a capacitive pressure detection device 10. It is prepared and configured.
  • the liquid crystal display device 5 is an IPS liquid crystal display device as an example, and has a cover glass plate 21 on the upper part.
  • the cover glass plate 21 has rigidity, but can be bent slightly downward when pressed with a finger or the like.
  • the liquid crystal display device 5 includes a cover glass plate 21, an upper polarizing plate 18, a color filter 17, a liquid crystal cell 16, a TFT electrode 20 that functions as a liquid crystal electrode, a glass substrate 15, a lower polarizing plate 19, a conductive plate.
  • the light plate 14, the reflection plate 13, and the LED 12 are included.
  • the cover glass plate 21 projects in a bowl shape around the liquid crystal display device main body 5 a from the upper polarizing plate 18 to the reflection plate 13.
  • the TFT electrode 20 is electrically connected to the first control unit 5C of the liquid crystal display device 5, outputs a drive signal to the TFT electrode 20, and controls the ON or OFF of the TFT electrode 20.
  • the liquid crystal display device storage section 6 has a storage space 3b for storing the liquid crystal display device 5 inside thereof.
  • the storage space 3b faces at least the frame-like wall portion 3a that supports the periphery of the cover glass plate 21 of the liquid crystal display device 5 to suspend and support the liquid crystal display device 5, and the bottom surface (back surface) of the liquid crystal display device 5.
  • a flat bottom portion 4a arranged in a horizontal direction.
  • the liquid crystal display device housing section 6 is generally composed of a frame-shaped frame member 3 having an arbitrary shape such as a quadrangle.
  • the frame member 3 is made of metal or synthetic resin.
  • a rectangular plate-like partition plate 4 made of metal such as stainless steel that functions as a bottom portion 4a having a flat upper surface and has a metal shielding function is fixed to an intermediate portion of the frame member 3.
  • the lower end of the frame member 3 is fixed to the upper end of the case 1. Therefore, the control board 7 for controlling the operation of the display device 40, the battery 2, and the like are accommodated in the space between the lower part of the partition plate 4, the lower part of the frame member 3, and the case 1.
  • the storage space 3b described above is constituted by the upper part of the partition plate 4 and the upper part of the frame member 3.
  • the capacitance-type press detection device 10 includes a lower electrode 31 fixedly disposed on the bottom 4a of the storage unit 6, an upper electrode 32 provided in the liquid crystal display device 5, a lower electrode 31, and an upper electrode 32. It is comprised with the 2nd control part 10C electrically connected by (flexible printed circuit board) etc. Therefore, the press detection device 10 determines at least the pressing force, for example, the pressing force and the pressing position (input position) based on the change in the capacitance between the lower electrode 31 and the upper electrode 32, in the second control unit 10 ⁇ / b> C. It is detected by.
  • the TFT electrode 20 is also used as the upper electrode 32 as shown in FIG. That is, the TFT electrode 20 is usually composed of a large number of divided electrodes, and when the divided electrodes of the TFT electrode 20 function as liquid crystal electrodes, respectively, the drive signals from the first control unit 5C are used individually. ON or OFF is controlled.
  • FIG. 2B is a circuit diagram when the TFT electrode 20 functions as an original liquid crystal electrode. Each divided electrode of the TFT electrode 20 is connected to a gate drive circuit 20b and a drain drive circuit 20c via the switching circuit 20a. And connected to each.
  • FIG. 2C is a circuit diagram when the TFT electrode 20 functions as the upper electrode 32 of the capacitance-type press detection device 10, and all the divided electrodes of the TFT electrode 20 are connected via the switching circuit 20a. It is connected (grounded) to the GND potential and is not connected to the gate drive circuit 20b and the drain drive circuit 20c.
  • the gate drive circuit 20b and the drain drive circuit 20c are provided in the first control unit 5C of the liquid crystal display device 5.
  • the capacitance-type press detection device 10 is configured by utilizing the gap 11 formed between the bottom surface and at least the gap interposed between the upper electrode 32 and the lower electrode 31.
  • the gap 11 is formed of an air layer as an example, and functions as a dielectric that allows the upper electrode 32 disposed in the liquid crystal display device 5 to be curved.
  • a specific example of the gap 11 is a gap of about 0.1 mm to 2 mm, and an example is a gap of 0.5 mm.
  • the second control unit 10C of the press detection device 10 acquires a constant voltage section of the drive signal from the first control unit 5C of the liquid crystal display device 5. Since the voltage greatly fluctuates in the section when the voltage of the drive signal is from ON to OFF and the section when the voltage of the drive signal is from OFF to ON, the second control in the press detection device 10 occurs. It is not used for the detection operation by the unit 10C. That is, the second control unit 10C detects the capacitance by using the TFT electrode 20 as the upper electrode 32 only during the voltage constant interval of the drive signal acquired from the first control unit 5C of the liquid crystal display device 5. I am doing so.
  • the first control unit 5C of the liquid crystal display device 5 and the second control unit 10C of the press detection device 10 are connected to the third control unit 40C of the display device 40, respectively. Therefore, based on the result of the pressure detection by the second control unit 10C of the pressure detection device 10, the display of the liquid crystal display device 5 is controlled via the first control unit 5C by the control operation of the third control unit 40C. The operation of the device 40 is controlled.
  • the shape of the lower electrode 31 can be an electrode having a predetermined pattern.
  • the upper electrode 32 and the lower electrode 31 are shown in FIG.
  • the TFT electrode 20 is used as the upper electrode 32
  • all the divided electrodes of the upper electrode 32 are set to the ground potential. Therefore, the shape of the upper electrode 32 is simplified and shown as one electrode in FIG. This shape is shown in FIG. 3 as electrodes having a predetermined pattern.
  • the predetermined pattern in FIG. 3 is, for example, a type that can detect a plurality of pressed points, and therefore, a series of rhombic row electrodes 51 parallel to each other, and a series of rhombic column electrodes 52 parallel to each other, Are orthogonal to each other to form a lattice pattern shape. That is, the patterned electrode illustrated in FIG. 3 as the lower electrode 31 is laid out in accordance with a rhombus pattern formation arrangement in which electrodes in which rows and columns overlap are formed in a rhombus pattern. In this example, the row electrodes 51 and the column electrodes 52 are arranged so as to be on the same plane or as close to the same plane as possible. In the example shown in FIG.
  • the large rhombus portions 51a and 52b of the non-overlapping row electrode 51 and the column electrode 52 can be coplanar, and the narrow connection portions 51b and columns of the overlapping row electrodes.
  • the narrow connecting portions 52b of the electrodes can be separated by a thin layer of dielectric between them.
  • the narrow connection portion 51b of the row electrode or the narrow connection portion 52b of the column electrode may be a jumper that enables avoidance of contact between the row electrode and the column electrode.
  • the rhombic column electrode 52 is represented by hatching a large number of dots.
  • the actual shape is not an aggregate of dots but is the same as that of the row electrode 51. It is a diamond-shaped flat plate.
  • the cover glass plate 21 of the display device 40 For the input operation, when a finger or the like comes into contact with the cover glass plate 21 of the display device 40, the cover glass plate 21 is slightly bent downward at the contact point. Then, the entire liquid crystal display device 5 is slightly curved, and the TFT electrode 20 of the liquid crystal display device 5 is also slightly curved. Since the TFT electrode 20 also serves as the upper electrode 32 of the press detection device 10, the bent portion of the upper electrode 32 approaches the lower electrode 31, thereby causing a fringe electric field between adjacent patterned electrodes of the lower electrode 31. Based on the interference by the upper electrode 32 of the line, the capacitance between adjacent patterned electrodes changes.
  • the current flowing through the column electrode 52 when a voltage is applied to the row electrode 51 is detected, while the current flowing through the row electrode 51 when a voltage is applied to the column electrode 52 is detected. Then, each current change due to the approach of the TFT electrode 20 is observed.
  • the TFT electrode 20 is grounded, and the excitation voltage is applied to the column electrode 52 (or the row electrode 51).
  • the fringe electric field lines are symmetrical (or substantially symmetrical) on both sides of the row electrode 51 and the column electrode 52, and on one side, the fringe electric field lines are directed toward the front surface (uppermost surface) of the display device 40.
  • the fringe electric field lines extend in a direction away from the front surface of the display device 40 (for example, the back surface side of the display device 40). Since the fringe electric field toward the front side of the display device 40 is obstructed by the TFT electrode 20, the measured capacitance between the row electrode 51 and the column electrode 52 tends to decrease.
  • the TFT electrode 20 moves toward the adjacent row electrode 51 and column electrode 52, thereby the display device 40.
  • a further portion of the front fringe field of the GaN is shorted or partially terminated by the grounded TFT electrode 20. Therefore, the current flowing through the column electrode 52 flows at least partially to the TFT electrode 20, so that the measured capacitance between the adjacent row electrode 51 and the column electrode 52 becomes equal to the row electrode 51 whose ground plane is adjacent. , And compared to the capacitance measured when not approaching the column electrode 52, it decreases slightly.
  • a change in capacitance between adjacent row electrode 51 and column electrode 52 can be detected by measuring the current coupled to row electrode 51 based on the excitation voltage applied to column electrode 52.
  • the current decreases when a large amount of current flows through the TFT electrode 20 as the TFT electrode 20 approaches the adjacent row electrode 51 and column electrode 52.
  • changes in capacitance can be detected.
  • the second control unit 10C determines whether or not an input to the display device 40 has been performed based on the detected change in capacitance, and which capacitance of the row electrode 51 or the column electrode 52 is determined.
  • the position of the input is determined based on whether it has changed. Thereby, for example, input at a plurality of positions can be detected.
  • the upper electrode 32 is also used as the TFT electrode 20, it is on the light guide path of the backlight and is therefore made of a transparent material.
  • the lower electrode 31 may be transparent or opaque, and is made of ITO, silver paste, copper foil, etc., and is arranged by any method such as direct application by tampo printing or pasting of a film in which an electrode is formed on an insulating sheet. Can do.
  • the pressing force is transmitted to the entire liquid crystal display device 5.
  • the pressing force is transmitted to the upper electrode 32 provided in the liquid crystal display device 5 to bend and deform. Due to the curved deformation of the upper electrode 32, the capacitance between the row electrode 51 and the column electrode 52 changes, and the pressing force can be detected by the pressing detection device 10.
  • the press detection device 10 is incorporated in a portion on the inner side of the display unit of the liquid crystal display device 5. That is, the upper electrode 32 of the press detection device 10 is provided as a part of the constituent members of the liquid crystal display device 5 below the liquid crystal cell 16 (inside the display portion (for example, the liquid crystal cell 16) (FIG. 1).
  • the lower electrode 31 is disposed on a member different from the liquid crystal display device 5 (the bottom 4a of the storage unit 6). For this reason, when the cover glass plate 21 is pressed, the capacitance between the row electrode 51 and the column electrode 52 changes due to the pressing force transmitted from the cover glass plate 21 to the liquid crystal display device 5, and the press is performed based on the change.
  • the detecting device 10 can detect the pressing force. For this reason, even if the deformation due to the pressing force occurs, the visibility of the display image is not impaired.
  • the capacitive touch panel is disposed on the upper side of the color filter of the liquid crystal display device as in the past, the transmittance is reduced, and the capacitive touch panel is disposed above the liquid crystal display device.
  • the press detection apparatus 10 is arrange
  • the upper electrode 32 is also used as the TFT electrode 20, there is no additional member to the existing structure, it is easy to manufacture, the number of constituent members can be reduced, and the overall thickness can be reduced. You can also. Therefore, in this embodiment, it can be made thinner than the conventional method.
  • the shape of the lower electrode 31 can be a simple rectangular plate electrode called a so-called solid pattern
  • the shape of the upper electrode 32 can also be a TFT electrode of the liquid crystal display device 5 as will be described later.
  • it may be a simple rectangular plate electrode called a so-called solid pattern. That is, when the shapes of the lower electrode 31 and the upper electrode 32 are respectively rectangular plate electrodes, it is possible to simply perform a pressing position detection operation at only one point.
  • the change in the capacitance between the row electrode 51 and the column electrode 52 is caused by the static change between the upper electrode 32 and the lower electrode 31. What is necessary is just to read as a change in electric capacity.
  • the upper electrode 32 and the lower electrode 31 are configured such that one electrode is a simple rectangular plate electrode called a so-called solid pattern and the other electrode is a predetermined pattern electrode (patterned electrode). It may be.
  • the upper electrode 32 also serves as the TFT electrode 20 of the liquid crystal display device 5, as shown in FIG. 2C, all the electrodes are dropped to the GND potential. In this case, only one point or a plurality of points can be detected by the pattern of the lower electrode 31.
  • the frame member 3 and the case 1 may be integrally configured as a casing regardless of the presence or absence of the partition plate 4.
  • the partition plate 4 is not provided, and the bottom of the case 1 or the bottom of the housing may function as the bottom 4a.
  • the gap 11 is not limited to one constituted by an air layer.
  • a foam layer 55 may be disposed instead of the air layer.
  • the foam layer 55 is a dielectric that allows the upper electrode 32 disposed in the liquid crystal display device 5 to be curved, and can forcibly ensure the gap 11.
  • the foam layer 55 is preferably one that increases the capacitance (in other words, increases the dielectric constant) and that hardly generates a repulsive force, and can be exemplified by a urethane foam.
  • the foam layer 55 can improve the dielectric constant more than the air layer, and can absorb shock.
  • the foam layer 55 can also be applied to the following modifications.
  • the upper electrode 32 can be disposed on the upper surface of the lower polarizing plate 19 of the liquid crystal display device 5 as shown in FIG.
  • the upper electrode 32 is made of a transparent material because it exists on the light guide path of the backlight on the upper surface of the lower polarizing plate 19.
  • the upper electrode 32 is closer to the lower electrode 31 than the TFT electrode 20, so that the electrostatic capacity is increased and a good SN ratio is obtained.
  • the pressure can be detected independently of the driving of the liquid crystal, so that the scanning speed for detecting the current change position at the time of detecting the pressure can be increased.
  • the upper electrode 32 can be disposed on the lower surface of the lower polarizing plate 19 of the liquid crystal display device 5 as shown in FIG.
  • the upper electrode 32 is made of a transparent material because it exists on the light guide path of the backlight on the lower surface of the lower polarizing plate 19.
  • the upper electrode 32 is closer to the lower electrode 31 than the TFT electrode 20, so that the capacitance is increased and a good SN ratio is obtained.
  • the pressure can be detected independently of the driving of the liquid crystal, so that the scanning speed for detecting the current change position at the time of detecting the pressure can be increased.
  • the upper electrode 32 can also serve as the reflector 13 of the liquid crystal display device 5 as shown in FIG.
  • the upper electrode 32 does not exist on the light guide path of the backlight, and therefore can be made of the same material as the lower electrode 31.
  • the transmittance is not lowered, the number of members is reduced, the thickness is not increased as a whole, and it is possible to contribute to thinning.
  • the upper electrode 32 can be disposed on the lower surface of the reflection plate 13 of the liquid crystal display device 5 as shown in FIG.
  • the upper electrode 32 does not exist on the light guide path of the backlight, and thus can be made of the same material as the lower electrode 31.
  • an insulating layer that covers the dot-shaped protrusion 56 or the lower electrode 31 may be formed. .
  • the transmittance does not decrease and the manufacture is easy, and among the many modified examples described above, the distance between the upper electrode 32 and the lower electrode 31 is the shortest, and the capacitance is increased. A good S / N ratio can be obtained.
  • the display device with a press detection function according to the present invention has an excellent effect that the visibility of the display image is not impaired, the number of additional members to the existing structure is small, and the thickness can be reduced as compared with the conventional method. It is useful as a touch panel or the like.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Position Input By Displaying (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un dispositif d'affichage à fonction de détection de pression n'ayant pas d'effet de perturbation sur une image affichée lors d'un appui sur ce dernier et permettant d'afficher une image hautement visible. Le présent dispositif d'affichage comprend : un dispositif d'affichage à cristaux liquides 5 sur lequel est agencée une plaque de verre de recouvrement 21 ; une partie logement 6 de dispositif d'affichage à cristaux liquides qui comporte une paroi de type cadre 3a qui supporte le dispositif d'affichage à cristaux liquides par support de la périphérie de la plaque de verre de recouvrement du dispositif d'affichage à cristaux liquides et qui comporte un fond plat 4a disposé en regard du fond du dispositif d'affichage à cristaux liquides et qui, de plus, délimite un espace 3b de logement servant à loger le dispositif d'affichage à cristaux liquides ; et un détecteur de pression capacitif qui comprend une électrode inférieure 31 disposée au fond de la partie de logement et une électrode supérieure 32 disposée dans le dispositif d'affichage à cristaux liquides, et qui est conçu pour détecter une force d'appui sur la base d'une variation de la capacité entre l'électrode inférieure et l'électrode supérieure.
PCT/JP2016/076935 2015-10-23 2016-09-13 Dispositif d'affichage à fonction de détection de pression WO2017068891A1 (fr)

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JP2015208886A JP2017083942A (ja) 2015-10-23 2015-10-23 押圧検出機能付表示装置
JP2015-208886 2015-10-23

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TWI745584B (zh) 2017-04-20 2021-11-11 日商三井化學股份有限公司 壓電基材、力感測器及致動器
JP6592036B2 (ja) 2017-06-15 2019-10-16 Ｎｉｓｓｈａ株式会社 圧力検出装置及び情報入力装置
JP2020052631A (ja) * 2018-09-26 2020-04-02 株式会社デンソー タッチ入力装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008026420A (ja) * 2006-07-18 2008-02-07 Nec Corp 円偏光板、液晶表示装置、及び端末装置
JP5798700B1 (ja) * 2014-09-19 2015-10-21 株式会社 ハイヂィープ スマートフォン

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008026420A (ja) * 2006-07-18 2008-02-07 Nec Corp 円偏光板、液晶表示装置、及び端末装置
JP5798700B1 (ja) * 2014-09-19 2015-10-21 株式会社 ハイヂィープ スマートフォン

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