WO2011074331A1 - 座標センサ及び表示装置 - Google Patents
座標センサ及び表示装置 Download PDFInfo
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- WO2011074331A1 WO2011074331A1 PCT/JP2010/068993 JP2010068993W WO2011074331A1 WO 2011074331 A1 WO2011074331 A1 WO 2011074331A1 JP 2010068993 W JP2010068993 W JP 2010068993W WO 2011074331 A1 WO2011074331 A1 WO 2011074331A1
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- WIPO (PCT)
- Prior art keywords
- light
- image display
- light emitting
- wavelength selective
- reflection mirror
- Prior art date
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- 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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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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
- G02F1/13338—Input devices, e.g. touch panels
Definitions
- the present invention relates to a coordinate sensor that detects the designated coordinates of an object to be detected such as a finger or a pen, and a display device including the coordinate sensor.
- a display device with a touch panel has been developed that has a touch panel (coordinate sensor) function that can detect the touched position when the panel surface is touched with a finger or an input pen. Has been.
- a display device with a touch panel a display device using a so-called resistive film type or capacitive type touch panel has been mainly used.
- a special panel for position detection is required, which causes a problem that the entire device becomes thick. Further, providing such a touch panel on the screen (display area) of the display device causes a problem that visibility is lowered.
- a bus line (scanning signal wiring and display data signal wiring) of a display element such as a TFT (Thin Film Transistor) is used as a bus line of the light receiving element (scanning). If display and sensing are performed in a time-sharing manner together with signal wiring and data readout wiring), the operation speed is limited.
- an optical scanning touch panel integrated display device has been developed, and these do not cause a problem of a decrease in aperture ratio or a restriction on operation speed.
- the optical scanning touch panel integrated display device refers to a display device that scans the surface of the panel with light and detects the position of the finger by detecting blocking of the light by a finger or the like.
- Patent Document 1 describes the above-described optical scanning touch panel integrated display device.
- FIG. 11 is a schematic diagram showing the overall configuration of the display device.
- a light emitting element is formed outside both corners of one short side (right side in the figure) of a rectangular display screen 100 touched by an indicator (recognized object) S such as a finger or a pen.
- Optical transmission / reception units 101a and 101b each having an optical system including 111a and 111b, light receiving elements 113a and 113b, polygon mirrors 116a and 116b, and the like are provided.
- a retroreflective sheet 102 is provided outside the three sides excluding the right side of the display screen 100.
- the scanning of the projection light by the light transmitting / receiving unit 101b will be described.
- the projection light from the light transmission / reception unit 101b is shielded by the light shielding member 170 provided so that the light projected from the light transmission / reception unit 101b does not enter the light transmission / reception unit 101a from the scanning start position where it directly enters the light receiving element 113b.
- 11 is scanned counterclockwise in FIG. 11 and reaches a position (Ps) that is reflected by the tip of the retroreflective sheet 102. Thereafter, the projection light is reflected by the retroreflective sheet 102 until reaching the position (P1) reaching one end of the indicator S. And until the position (P2) reaching the other end of the indicator S, the transmitted light is blocked by the indicator S, and after passing the position (P2), until the scanning position (Pe), The transmitted light is reflected by the retroreflective sheet 102.
- the light receiving element 113b detects reflected light from the retroreflective sheet 102, and detects a range in which the light receiving level is smaller than a predetermined threshold as a blocking range where the light beam is blocked by a finger or a pen. It has become.
- the margin voltage is determined based on fluctuations in the amount of light received due to noise in the light receiving system, digitizing errors during A / D conversion, accumulated time-series received light data, and the like.
- Patent Document 1 has a problem that it is difficult to set an accurate threshold value when the indicator S is present.
- the scanning light is turned off and the received light amount is detected by the light receiving elements 113a and 113b. Since the threshold value is set based on the detection result, it is possible to set the threshold value from which the influence of ambient ambient light has been removed. As a result, it is said that the detection accuracy of the indicator S can be improved.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a coordinate sensor that does not depend on changes in ambient light and can easily detect the position of a recognized object, and the coordinate sensor. It is to provide a display device.
- Another object of the present invention is to provide a coordinate sensor that facilitates accurate position detection of a recognized object even when ambient light is high, and a display device including the coordinate sensor.
- the coordinate sensor of the present invention is: A light emitting element;
- a line sensor in which a plurality of light receiving elements are arranged includes at least two line sensors respectively arranged along the X-axis direction and the Y-axis direction, The light received from the light emitting element and passed through the image display area of the image display body is received by the light receiving element, whereby the indicated coordinates of the detection target in the image display area are determined by the amount of light received by the light receiving element.
- a coordinate sensor for detecting changes Between the light emitting element and the light receiving element, there is provided a wavelength selection unit for selectively making the light from the light emitting element incident, The wavelength selection unit has at least one function of selectively reflecting, selectively transmitting, selectively reflecting and transmitting light emitted from the light emitting element. To do.
- the wavelength selection unit for selectively allowing the light from the light emitting element to enter between the light emitting element and the light receiving element. This makes it difficult for ambient ambient light to enter the light receiving element.
- the coordinate detection is less susceptible to the ambient ambient light.
- the above-described wavelength selective section that selectively reflects and transmits is not only the above-described selective reflection and transmission but also the selective reflection and the selective transmission. (For example, two combinations of a band-pass mirror and a band-pass filter).
- the coordinate sensor of the present invention includes a light emitting element, and a line sensor in which a plurality of light receiving elements are disposed, and at least two line sensors respectively disposed along the X-axis direction and the Y-axis direction.
- the light receiving element emits the light emitted from the image display body and passes through the image display area of the image display body, so that the indicated coordinates of the detection target in the image display area are detected by the change in the amount of light received by the light receiving element.
- (B ') shows a wavelength region with a high transmittance of the transmission filter, and (c) shows a signal light in which ambient light is removed by the wavelength selective reflection mirror or the transmission filter. Only the effect that is extracted is shown.
- FIG. 1 is a schematic diagram showing a schematic configuration of the liquid crystal display device 1.
- a liquid crystal display device As shown in FIG. 1, in a liquid crystal display device 1, an active matrix substrate 2 and a counter substrate 3 are arranged to face each other, and a liquid crystal layer (not shown) is provided between these substrates 2 and 3 as a sealing material. It is enclosed by.
- a chip 14 is provided in the frame region of the active matrix substrate 2 using a COG (Chip On Glass) technology, and an A / D conversion circuit, a gate / source drive circuit, and the like are mounted on the chip 14, for example. Yes.
- the chip 14 is connected to an external circuit by an FPC (flexible printed circuit) 15 through an anisotropic conductive film.
- the chip 14 is provided in the frame region of the active matrix substrate 2 using the COG technology.
- the present invention is not limited to this.
- the chip 14 may be formed using the COF (Chip On FPC) technology. It may be used directly on the FPC 15.
- the upper side means a side opposite to the side where the FPC 15 is provided in the liquid crystal display device 1.
- the line sensor 13 includes a light receiving element 13s (see FIG. 5) and a line sensor detection circuit 16 (see FIG. 5) as will be described in detail later.
- the wavelength selective reflection mirror 11 is molded or formed to be a 45 ° mirror with respect to light from the light emitting diode 10 as a light emitting element described later. Since the prism having the polished slope is used, the wavelength selective reflection mirror 11 and the line sensor 13 are configured to overlap in plan view, but the present invention is not limited to this.
- Two light emitting diodes 10 are arranged as light sources (light emitting elements) for the coordinate sensor at both corners outside the lower side of the display region R1 of the liquid crystal display device 1.
- the two light emitting diodes 10 are used as the light source for the coordinate sensor. However, if light can be irradiated so as to cover the entire coordinate input region R1 of the coordinate sensor,
- the arrangement position and the number are not particularly limited.
- the light emitting diode 10 is preferably irradiated with invisible light such as infrared light or ultraviolet light so as to cover the entire surface of the coordinate input region R1 of the coordinate sensor. That is, the light emitting element preferably emits light in a wavelength region other than the visible region. Thereby, the coordinates (indicated coordinates) of the recognition object as the detection object can be detected without irradiating invisible light and affecting the display state of the liquid crystal display device 1.
- the wavelength selective reflection mirror 11 preferably reflects only the light emitted from the light emitting diode 10 and guides it to the light receiving surface 13 a of the line sensor 13. Thereby, light (for example, environmental light) other than the light emitted from the light emitting diode 10 can be prevented from entering the light receiving surface 13a of the light receiving element 13s.
- the light from fluorescent lamps and the light under dim ambient light outdoors contain almost no infrared light or ultraviolet light. Therefore, when the light emitting diode 10 emits infrared light or ultraviolet light, only the light emitted from the light emitting diode 10 can be more reliably guided to the light receiving surface 13a of the light receiving element 13s.
- the wavelength selective reflection mirror 11 is disposed and only the light emitted from the light emitting diode 10 is reflected.
- a transmission filter may be disposed on a light receiving mirror that does not have a wavelength selective reflection function. This transmission filter transmits only the light irradiated by the light emitting diode 10, and the light is reflected by the light receiving mirror and enters the light receiving surface 13 a of the line sensor 13. Thereby, light (for example, environmental light) other than the light irradiated from the light emitting diode 10 can be prevented from entering the light receiving surface 13 a of the line sensor 13.
- the line sensor 13 and the wavelength on the light receiving surface 13a of the line sensor 13 are disposed outside the upper, left, and right sides of the display area (coordinate input area of the coordinate sensor) R1 of the liquid crystal display device 1.
- the selective reflection mirror 11 is arranged, the arrangement position and the number of the wavelength selective reflection mirror 11 and the line sensor 13 are not particularly limited, and the light emission characteristics, the arrangement position, the number, and the like of the light emitting diode 10 are taken into consideration. And can be determined as appropriate.
- the line sensor 13 is preferably arranged along at least two sides in order to detect the (x, y) coordinates (input coordinates) of the place touched by the recognized object.
- FIG. 2 is a cross-sectional view illustrating a schematic configuration of the liquid crystal display device 1.
- a backlight 8 is provided on one surface of a liquid crystal panel 7 constituting the main part of the image display body, and a protective plate 9 is provided on the other surface.
- the surface of the protective plate 9 is an image display surface.
- the active matrix substrate 2 and the counter substrate 3 are arranged to face each other, and the liquid crystal layer 4 is sealed between the substrates 2 and 3 by a sealing material.
- FIG. 5 is a block diagram showing a schematic configuration of the line sensor of the present embodiment.
- a lower polarizing plate 6 is provided on the other surface of the active matrix substrate 2.
- the line sensor 13 is provided in the same process as the process of forming the pixel TFT provided on the active matrix substrate 2. Therefore, the line sensor 13 is provided on the pixel TFT formation surface (active element formation surface) of the active matrix substrate 2. However, the line sensor 13 is not necessarily provided on the active matrix substrate 2.
- a color filter layer 3a On one surface of the counter substrate 3 facing the active matrix substrate 2, a color filter layer 3a, a counter electrode (not shown), and an alignment film (not shown) are stacked. On the other surface of the counter substrate 3, an upper polarizing plate 5 and a protective plate 9 are laminated in this order.
- a material that can protect the liquid crystal panel 7 without reducing the visibility of the display region R ⁇ b> 1 of the liquid crystal display device 1 for example, an acrylic transparent material can be used, but is not limited thereto. Absent.
- a light emitting diode 10 is disposed at the end of the protective plate 9, and the light emitting diode 10 emits light along the surface of the protective plate 9 so as to cover the entire surface of the coordinate input region R ⁇ b> 1.
- a wavelength selective reflection mirror 11 as an optical path changing unit is provided. Yes.
- the wavelength selective reflection mirror 11 is a mirror that reflects only the light irradiated by the light emitting diode 10 and guides it to the light receiving surface 13a of the pair of line sensors 13 that are arranged to face the wavelength selective reflection mirror 11.
- the facing arrangement means that the mirror is arranged so that the light emitted from the light emitting diode 10 is reflected by the wavelength selective reflection mirror 11 and can enter the light receiving surface 13 a of the line sensor 13. Means that.
- an air layer 17 is formed between the protective plate 9 and the upper polarizing plate 5.
- a light-shielding film (not shown) is formed at a location where the air layer 17 is interposed, so that ambient light or the like can be more reliably prevented from entering the line sensor 13. .
- the air layer 17 may be filled with, for example, glue, and the protective plate 9 and the liquid crystal panel 7 may be in close contact with each other. Even in this case, by inserting a light shielding film at a position between the protective plate 9 and the upper polarizing plate 5, it is possible to suppress the incidence of ambient light or the like on the line sensor 13.
- a light shielding film 12 is formed on each of the light emitting diode 10 and the wavelength selective reflection mirror 11.
- the amount of light emitted from the light emitting diode 10 directly incident on the viewer side of the liquid crystal display device 1 can be suppressed.
- the amount of light other than light emitted from the light emitting diode 10 (for example, ambient light) is incident on the light receiving surface 13 a of the line sensor 13 is suppressed. can do.
- a backlight 8 for irradiating the liquid crystal panel 7 with light is disposed on the back side of the liquid crystal panel 7.
- the backlight 8 includes a plurality of white LEDs as light sources.
- FIG. 3A is a cross-sectional view showing a schematic configuration of the peripheral portion of the wavelength selective reflection mirror 11, and FIGS. 3B to 3D are schematic views of the main part of FIG. is there.
- a light shielding film 12a is provided on the wavelength selective reflection mirror 11 as an eave.
- the light shielding film 12a as the eaves makes it difficult for light other than the light emitted from the light emitting diode 10 (for example, ambient light) to directly hit the wavelength selective reflection mirror 11, It becomes difficult to enter the light receiving surface 13 a provided in the line sensor 13.
- the wavelength selective reflection mirror 11 Since the wavelength selective reflection mirror 11 is provided, only the light emitted from the light emitting diode 10 is selectively reflected among the light incident on the wavelength selective reflection mirror 11 as shown in FIG. , And enters the light receiving surface 13a of the line sensor 13.
- a black member having an unevenness that completely blocks light and absorbs light is optimal.
- a member made of black paint (print) can be used as a shape, but is not limited thereto.
- the length h1 of the light shielding film 12a extended as the eaves varies depending on the use environment of the user.
- FIG. 9 is a graph showing the relationship between the ambient illuminance and h1 / h2, which is the ratio of the length h1 of the light-shielding film 12a extended as an eaves necessary for light shielding to the height h2 of the wavelength selective reflection mirror 11. .
- the ambient illuminance and h1 / h2 are linear.
- the length h1 of the light shielding film 12a necessary for light shielding is preferably not less than 2 times and not more than 6 times the height h2 of the wavelength selective reflection mirror 11.
- the amount of light other than the light emitted from the light emitting diode 10 (for example, ambient light) directly hits the wavelength selective reflection mirror 11 can be sufficiently reduced.
- the counter substrate 3 made of a glass substrate or the like has a thickness of 0.2 mm
- the upper polarizing plate 5 has a thickness of 0.3 mm
- the air layer 17 has a thickness of 0.5 mm
- the protective plate 9 has a thickness of 0.
- the wavelength selective reflection mirror 11 has a thickness (height) h2 of 0.5 mm
- the light shielding film 12a has a length h1 of 1.5 mm
- the sealing material 18 has a thickness of 0.1 mm.
- the amount of light other than the emitted light for example, ambient light
- the protective plate 9 and the wavelength selective reflection mirror 11, and the wavelength selective reflection mirror 11 and the light shielding film 12 a are bonded together by a sealing material 18.
- the end portions of the protective plate 9 and the upper polarizing plate 5 are bonded together with a sealing material 18.
- 3 is a fixing double-sided tape or the like, and is sufficiently thin with respect to the height h2 of the wavelength selective reflection mirror 11.
- an air layer 17 is interposed between the protective plate 9 and the upper polarizing plate 5.
- a light shielding film 12b as a light shielding member is provided on the surface of the protective plate 9 facing the air layer 17 and on the surface of the upper polarizing plate 5 facing the air layer 17 respectively.
- a black member having an unevenness that completely blocks light and absorbs light is optimal.
- a member made of black paint (print) can be used as a shape, but is not limited thereto.
- the light shielding film 12b is formed to have the same width as the width h1 of the light shielding film 12a at least in a region overlapping with the light shielding film 12a extending as an eave. Thereby, ambient light etc. can fully be shielded.
- the light shielding films such as the light shielding films 12a and 12b are collectively referred to as the light shielding film 12.
- a low reflection sheet 19 as a light shielding member is provided on the protective plate 9 in the vicinity of the wavelength selective reflection mirror 11.
- the low reflection sheet 19 means a sheet having a low reflectance with respect to light (for example, ambient light) other than light emitted from a light source such as the light emitting diode 10.
- the ambient light is less likely to be reflected by the low reflection sheet 19, so that the amount of ambient light incident on the wavelength selective reflection mirror 11 can be reduced. Therefore, it is possible to prevent light (for example, ambient light) other than light emitted from the light emitting diode 10 from entering the light receiving surface 13 a of the line sensor 13.
- a member that is black and has unevenness that completely blocks light and absorbs light is optimal, as with the light shielding films 12a and 12b.
- a member made of black paint (print) can be used as a shape, but is not limited thereto.
- the low reflection sheet 19 is formed in the same width as the width h1 of the light shielding film 12a in a region overlapping with the light shielding film 12a extended as an eaves in a plan view. Thereby, ambient light etc. can fully be shielded.
- a light shielding slit 30 is provided as a light shielding member in a region overlapping the light shielding film 12a as the eaves in a plan view.
- the incident part is a part where the signal light emitted from the light emitting diode 10 enters the wavelength selective reflection mirror 11.
- signal light incident at a shallow angle is transmitted.
- ambient light incident at a high angle is less likely to be transmitted by the light-shielding slit 30, so that the amount of ambient light incident on the wavelength selective reflection mirror 11 can be reduced. it can. Therefore, it is possible to prevent light (for example, ambient light) other than light emitted from the light emitting diode 10 from entering the light receiving surface 13 a of the line sensor 13.
- a member that is black and has unevenness that completely blocks light and absorbs light on the surface is optimal.
- a member made of black paint (print) can be used as a shape, but is not limited thereto.
- an incident direction can be limited, so that the space
- FIG. 10 is a graph showing the relationship between ambient illuminance and the number of slits of the light shielding slit 30 necessary for light shielding.
- the ambient illuminance and the number of light shielding slits 30 have a linear relationship.
- the number of the light shielding slits 30 necessary for light shielding is two. Thereby, ambient light etc. can fully be shielded.
- wavelength selective reflection mirror 11 will be described in more detail with reference to FIG.
- FIG. 4 is a waveform diagram for explaining the effect of the wavelength selective reflection mirror 11.
- the solid line indicates the light emitted from the light emitting diode 10, that is, the signal light, and the broken line indicates the ambient environment light.
- signal light and ambient environment light are congested under the usage environment of the liquid crystal display device 1.
- Ambient ambient light has a relatively broad wavelength range.
- the wavelength selective reflection mirror 11 having a function of selecting and reflecting a specific wavelength in incident light, only signal light can be efficiently extracted as shown in FIG. .
- the wavelength range of the signal light corresponds to the wavelength range with high reflectivity of the wavelength selective reflection mirror 11 shown in FIG.
- wavelength selective reflection mirror 11 is used in the present embodiment, a transmission filter (wavelength selective transmission filter) may be used as the wavelength selection unit.
- the wavelength range of the signal light corresponds to the wavelength range with high transmittance of the wavelength selective transmission filter shown in FIG.
- wavelength selective reflection mirror 11 and the wavelength selective transmission filter can be used in combination as the wavelength selection unit.
- the line sensor 13 as the coordinate sensor is provided with the wavelength selective reflection mirror 11, the light shielding film 12, the low reflection sheet 19, and the light shielding slit 30. Therefore, light (for example, ambient light) other than the light emitted from the light emitting diode 10 can be reliably prevented from entering the light receiving surface 13 a of the line sensor 13.
- five paths A to F are considered as paths through which ambient ambient light is incident on the light receiving surface 13a of the line sensor 13.
- the light receiving surface of the line sensor 13 It does not enter 13a.
- the light incident along the path E is less likely to be reflected by the low reflection sheet 19 formed on the upper surface of the protective plate 9, and therefore does not enter the wavelength selective reflection mirror 11.
- the light incident along the path F is blocked by the light blocking slit 30 formed in the vicinity of the incident portion of the wavelength selective reflection mirror 11 and does not enter the wavelength selective reflection mirror 11.
- the amount of ambient ambient light incident on the light receiving surface 13a of the line sensor 13 is greatly reduced, and thus the position of the recognized object can be accurately detected even when the ambient ambient light is high. is there.
- FIG. 5 is a block diagram showing a schematic configuration of the line sensor 13.
- the line sensor 13 includes light receiving elements 13 s arranged in one direction (one-dimensional array) and a line sensor detection circuit 16.
- the line sensor 13 is integrally formed on the outer periphery of the active matrix substrate 2 so that the light receiving surface 13a faces upward, as shown in FIG.
- the light receiving element 13s is formed at the same time as a circuit such as a pixel TFT on the same surface of the active matrix substrate 2 as a circuit such as a pixel TFT using a known semiconductor technology.
- the light receiving element 13s is formed by an optical sensor such as a photodiode or a phototransistor, and detects the amount of received light by taking out a current or charge according to the intensity of the received light to the outside.
- an optical sensor such as a photodiode or a phototransistor
- the light receiving element 13s is not particularly limited as long as it senses light emitted from the light emitting diode 10 which is a light source for indicating coordinate detection.
- a-Si amorphous silicon
- An optical sensor made of p-Si (polysilicon, polycrystalline silicon) or CG silicon (continuous grain silicon, continuous grain boundary crystalline silicon) can be used.
- the line sensor detection circuit 16 includes a shift register 20, a switching element 21, a detection line 22, and an A / D (analog-digital) conversion circuit 23.
- the shift register 20 generates a scanning signal for sequentially selecting the switching elements 21 when CLK (clock pulse) is input from the outside.
- the switching element 21 functions as a switch for taking out a current or a charge corresponding to the intensity of light received by the corresponding light receiving element 13 s to the detection line 22 in accordance with the scanning signal generated by the shift register 20.
- the signal on the detection line 22 is converted into a digital signal by the A / D conversion circuit 23 and output to a coordinate detection circuit (not shown).
- the coordinate detection circuit detects the position of the recognition object based on the digital signal.
- FIG. 6 is a block diagram showing a system configuration of the liquid crystal display device 1.
- the main control unit (host) 24 and the timing controller (T-CON) 25 are connected by an LVDS (Low Voltage Differential Signaling) method.
- LVDS Low Voltage Differential Signaling
- a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, an RGB data signal, a clock signal, and the like are transmitted.
- the timing controller 25 sends an RGB data signal to a source driving circuit (not shown) constituting a liquid crystal driving circuit (Display controller) 26 and a gate driving circuit (not shown) constituting the liquid crystal driving circuit 26. Control.
- a current or charge corresponding to the intensity of light received by the light receiving element 13s (not shown) provided in the liquid crystal panel 7 is converted into a digital signal by the A / D conversion circuit (ADC) 23. And is transmitted to a coordinate detection circuit (Recognition LSI) 27.
- the liquid crystal display device 1 includes a drive circuit (LED Driver) 29 that controls the light emitting diode 10 that is a light source for the coordinate sensor, and a drive circuit (LED Driver) 28 that controls the light emitting diode provided in the backlight 8. Is provided.
- the logic power supply circuit 31 supplies 1.8V or 3.0V power to the coordinate detection circuit 27 and the first power supply circuit (Power Supply for Sensor and display) 32.
- the first power supply circuit 32 supplies power to the liquid crystal drive circuit 26 and the line sensor 13.
- the second power supply circuit (Power Supply) 33 supplies power to the drive circuit 29 that controls the light emitting diode 10 that is a light source for the coordinate sensor and the drive circuit 28 that controls the light emitting diode provided in the backlight 8. Supply.
- the coordinate detection circuit 27 and the main control unit 24 can be connected by a connection method such as SPI (Serial Peripheral Interface), parallel, USB (Universal Serial Bus).
- SPI Serial Peripheral Interface
- USB Universal Serial Bus
- an interrupt signal (INT_B) is transmitted from the coordinate detection circuit 27 to the main control unit 24, and then the coordinate data is transmitted.
- the liquid crystal display device 1 converts the current or charge amount corresponding to the intensity of the light received by the light receiving element 13s into a digital signal by the line sensor detection circuit 16, and transmits the digital signal to the coordinate detection circuit 27 to be recognized.
- the coordinates are detected.
- FIG. 7 is a plan view schematically showing a schematic configuration of principal parts and a coordinate detection principle in the liquid crystal display device 1.
- the coordinate sensor includes a line sensor 13 and a wavelength selective reflection mirror 11 arranged on each line sensor 13 on the outside of the upper, left, and right sides of the display region R1.
- the light emitting diodes 10 are arranged at both corners outside the lower side of the display area R1 of the liquid crystal display device 1 as light sources for coordinate sensors (light sources for indicating coordinate detection).
- the opposing arrangement is, for example, a line sensor provided at a position where light incident on one wavelength selective reflection mirror can enter the light receiving surface after being reflected by the wavelength selective reflection mirror. Means placement.
- the light receiving element 13s provided in the line sensor 13 takes out a current or a charge amount corresponding to strong light to the outside.
- the position touched with a recognized object such as a finger can be obtained by triangulation.
- the two light emitting diodes 10 are made to emit light alternately, that is, while the light emitting diode 10 on the right side in the figure emits light, light is received using the line sensors 13 on the upper side and the left side in the figure.
- the line sensor 13 on the upper side and the right side in the figure is used to receive light and detect the coordinates of the recognized object.
- FIG. 8 is a diagram for explaining a method of calculating a position touched with a recognized object such as a finger by triangulation.
- the (x, y) coordinate calculation method of the recognized object is divided into four cases depending on the area touched in the coordinate input area R1.
- the light emitting diode 10 located on the left side of the lower side in the figure (hereinafter referred to as “lower side”) is referred to as the light source 10a, and the light emitting diode 10 located on the right side of the lower side is referred to as the light source 10b.
- the coordinate input area R1 is divided into four areas formed by connecting diagonal lines
- the right side in the figure (hereinafter referred to as “right side”) is used as the base, and the coordinate input area R1 indicated by the intersection of the diagonal lines is used.
- a region indicated by a triangle having a center point (hereinafter simply referred to as “center point”) as a vertex is referred to as region A.
- the upper side hereinafter referred to as “upper side”
- the left side hereinafter referred to as “left side”
- the lower side of the coordinate input region R1 in the figure are set as the bottom side, and the above-mentioned center point is the vertex.
- Regions indicated by triangles are defined as region B, region C, and region D, respectively.
- the length of the upper side and the lower side of the coordinate input area R1 is “H”, and the length of the right side and the left side is “V”.
- a point (circled A shown in FIG. 8; hereinafter the same applies to points B to D)
- points B to D points in the area A
- the point A is viewed from the light source 10a.
- a shadow with respect to the light from the light source 10a is formed on the right side.
- a shadow with respect to the light from the light source 10b can be formed on the upper side.
- one long side can be set as the x coordinate and the one short side can be set as the y coordinate.
- the shadow by the light source 10a and the shadow by the light source 10b can both be on the upper side.
- the point B exists on a straight line (202) passing through the light source 10b and the point A.
- the following variables b ⁇ c Can be calculated in the same manner as below.
- the straight line (202) passing through is expressed by equation (2) using the coordinates x and y.
- C point when one point in the region C (hereinafter referred to as “C point”) is touched, a shadow by the light source 10a can be formed on the upper side, and a shadow by the light source 10b can be formed on the left side.
- the point C will be described as existing on a straight line (203) passing through the light source 10a and the point B. However, in this case as well, the following point is shown according to the position of the point C By changing each variable c ⁇ d, it can be calculated in the same manner as described below.
- the straight line (203) is expressed by the above equation (6) using the coordinates x and y.
- D point when one point in the region D (hereinafter referred to as “D point”) is touched, a shadow by the light source 10a can be formed on the right side, and a shadow by the light source 10b can be formed on the left side.
- the point D is described as being present at the intersection of a straight line (201) passing through the light source 10a and the A point and a straight line (204) passing through the light source 10b and the C point. Also in this case, the calculation can be performed in the same manner as described below by changing each variable a ⁇ d according to the position of the point D.
- a straight line (201) passing through the light source 10a and the point A and on a straight line (204) passing through the light source 10b and the point C a straight line (201) passing through the light source 10a and the point D and As described above, the straight line (204) passing through the light source 10b and the point D is represented by the above formula (1) and formula (10), respectively.
- the detection signal level (the amount of received light detection) of the line sensor 13 in which a shadow is generated is lower than the detection signal level of the line sensor 13 in a region that does not become a shadow.
- the designated coordinates of the recognized object can be detected by triangulation.
- the coordinate sensor of the present invention is
- the wavelength selection unit is a wavelength selection reflection mirror.
- the coordinate sensor of the present invention is
- the wavelength selection unit is a wavelength selective transmission filter.
- the wavelength selection unit can be easily formed by, for example, a bandpass mirror or a bandpass filter.
- the coordinate sensor of the present invention is The wavelength selective reflection mirror is provided in an optical path changing unit that changes an optical path of light that has passed through the image display area,
- the line sensor is disposed outside the image display area and has a light receiving surface parallel to the image display surface of the image display body,
- the optical path changing unit guides light that has passed through the image display area to a light receiving surface of a pair of line sensors,
- the wavelength selective reflection mirror is covered with an eaves extending in a direction parallel to the image display surface.
- the coordinate sensor of the present invention is The length of the eaves extending in the direction parallel to the image display surface is not less than 2 times and not more than 6 times the length of the wavelength selective reflection mirror in the direction perpendicular to the image display surface.
- the wavelength selective reflection mirror is covered with the eaves. Furthermore, the length of the eaves is at least twice the length (apparent height) in the direction perpendicular to the image display surface of the wavelength selective reflection mirror.
- the position of the recognized object can be detected more independently of changes in ambient light.
- the length of the eaves is 6 times or less the apparent height of the wavelength selective reflection mirror, it is difficult to affect the image display.
- the coordinate sensor of the present invention is The image display surface is provided with a light shielding member in a region overlapping the eaves in plan view.
- the coordinate sensor of the present invention is An air layer is provided between the image display surface and the light receiving surface of the line sensor, A light-shielding member is provided in a region that overlaps with the eaves in a plan view and in contact with the air layer.
- the light shielding member is provided in a region overlapping the eaves in plan view.
- the light shielding member is provided in the region in contact with the air layer, the light shielding member can be provided without increasing the thickness of the coordinate sensor.
- the coordinate sensor of the present invention is The wavelength selective reflection mirror is characterized in that a light-shielding slit is provided in a region overlapping the eaves in a plan view in the vicinity of an incident portion where light from the light emitting element is incident.
- the coordinate sensor of the present invention is The optical path changing unit and the line sensor are arranged along three sides of the image display body, and the light emitting elements are arranged at both ends of the remaining one side.
- the position touched with a recognition object such as a finger can be obtained by triangulation.
- the coordinate sensor of the present invention is The light emitting element emits light in a wavelength region other than a visible region.
- the light emitting element since the light emitting element emits light outside the visible light region, selection / separation with respect to ambient ambient light becomes easy.
- the display device of the present invention is The coordinate sensor is provided.
- the display device of the present invention is The display device includes a counter substrate and an active matrix substrate,
- the line sensor is provided on an active element formation surface of the active matrix substrate.
- the line sensor is provided on the active element forming surface of the active matrix substrate. Therefore, since the line sensor can be formed in the active element forming process, the line sensor can be easily formed.
- the present invention can be suitably used for a display device with a coordinate sensor function.
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Abstract
Description
発光素子と、
複数の受光素子が配置されてなるラインセンサが、X軸方向及びY軸方向に沿ってそれぞれ配置された少なくとも2つのラインセンサとを備え、
上記発光素子から発光され、画像表示体の画像表示領域を通過した光を上記受光素子で受光することにより、上記画像表示領域における検出対象物の指示座標を、上記受光素子で受光する受光量の変化によって検出する座標センサであって、
上記発光素子と、上記受光素子との間に、上記発光素子からの光を選択的に入射させるための波長選択部が設けられており、
上記波長選択部は、上記発光素子から発光された光を選択的に反射する、選択的に透過する、選択的に反射及び透過するのうちの少なくとも1つの機能を有していることを特徴とする。
〔実施の形態〕
本発明の一実施の形態について、図1~図10に基づいて説明すれば以下の通りである。
図1は、液晶表示装置1の概略構成を示す模式図である。
次に、液晶表示装置1の断面構成について、図2に基づいて説明する。図2は、液晶表示装置1の概略構成を示す断面図である。
以下、図3に基づいて、波長選択反射ミラー11の周辺部の構成についてさらに詳しく説明する。
以下、図5に基づいてラインセンサ13の構成についてさらに詳しく説明する。
以下、図6に基づいて液晶表示装置1のシステム構成について説明する。
以下、図7に基づいて、座標センサによる座標検出原理を説明する。
図8は、三角測量により指などの認識物でタッチした位置を算出する方法について説明するための図である。
y=a×x/H …(1)
で示される。
y=V(H-x)/(H-b) …(2)
で示される。
a×x/H=V(H-x)/(H-b) …(3)
が導かれる。
x=H2×V/(a×H-a×b+H×V) …(4)
y=y=a×H×V/(a×H-a×b+H×V) …(5)
で求められる。
y=V×x/c …(6)
で示される。
V×x/c=V(H-x)/(H-b) …(7)
が導かれる。
x=c×H/(H-b+c) …(8)
y=H×V/(H-b+c) …(9)
で求められる。
y=d-d×H×x …(10)
で示される。
V×x/c=d-d×H×x …(11)
が導かれる。
x=c×d×H/(c×d+H×V) …(12)
y=d×H×V/(c×d+H×V) …(13)
で求められる。
a×x/H=d-d×H×x …(14)
が導かれる。
x=d×H/(a+d) …(15)
y=a×d/(a+d) …(16)
で求められる。
上記波長選択部が、波長選択反射ミラーであることを特徴とする。
上記波長選択部が、波長選択透過フィルタであることを特徴とする。
上記波長選択反射ミラーが、上記画像表示領域を通過した光の光路を変更する光路変更部に設けられており、
上記ラインセンサは、上記画像表示領域の外側に配置され、かつ、上記画像表示体の画像表示面に平行な受光面を有しており、
上記光路変更部は、上記画像表示領域を通過した光を、それぞれ対となるラインセンサの受光面に導光し、
上記波長選択反射ミラーが、上記画像表示面と平行な方向に延設されたひさしで覆われていることを特徴とする。
上記ひさしの上記画像表示面と平行な方向に延設された長さは、上記波長選択反射ミラーの上記画像表示面と垂直な方向の長さの2倍以上、6倍以下であることを特徴とする。
上記画像表示面には、上記ひさしと平面視において重なる領域に、遮光部材が設けられていることを特徴とする。
上記画像表示面と、上記ラインセンサの受光面との間には、空気層が設けられており、
上記ひさしと平面視において重なる領域であって、上記空気層と接する領域に、遮光部材が設けられていることを特徴とする。
上記波長選択反射ミラーにおいて、上記発光素子からの光が入射する入射部の近辺には、上記ひさしと平面視において重なる領域に、遮光スリットが設けられていることを特徴とする。
上記光路変更部および上記ラインセンサは、上記画像表示体の3辺に沿って配置され、残る1辺の両端部に上記発光素子が配置されていることを特徴とする。
上記発光素子は、可視領域以外の波長領域の光を出射することを特徴とする。
上記座標センサを備えていることを特徴とする。
上記表示装置は、対向基板とアクティブマトリクス基板とを備えており、
上記ラインセンサは、上記アクティブマトリクス基板のアクティブ素子形成面に設けられていることを特徴とする。
2 アクティブマトリクス基板
3 対向基板
4 液晶層
5 上側偏光板
6 下側偏光板
7 液晶パネル
8 バックライト
9 保護板
10 発光ダイオード (発光素子)
10a 光源
10b 光源
11 波長選択反射ミラー (波長選択部)
12 遮光膜
13 ラインセンサ
13a 受光面
13s 受光素子
14 チップ
15 FPC
16 ラインセンサ検出回路
17 空気層
18 シール材
19 低反射シート
20 シフトレジスタ
21 スイッチング素子
22 検出ライン
23 A/D変換回路
30 遮光スリット
Claims (12)
- 発光素子と、
複数の受光素子が配置されてなるラインセンサが、X軸方向及びY軸方向に沿ってそれぞれ配置された少なくとも2つのラインセンサとを備え、
上記発光素子から発光され、画像表示体の画像表示領域を通過した光を上記受光素子で受光することにより、上記画像表示領域における検出対象物の指示座標を、上記受光素子で受光する受光量の変化によって検出する座標センサであって、
上記発光素子と、上記受光素子との間に、上記発光素子からの光を選択的に入射させるための波長選択部が設けられており、
上記波長選択部は、上記発光素子から発光された光を選択的に反射する、選択的に透過する、選択的に反射及び透過するのうちの少なくとも1つの機能を有していることを特徴とする座標センサ。 - 上記波長選択部が、波長選択反射ミラーであることを特徴とする請求項1に記載の座標センサ。
- 上記波長選択部が、波長選択透過フィルタであることを特徴とする請求項1又は2に記載の座標センサ。
- 上記波長選択反射ミラーが、上記画像表示領域を通過した光の光路を変更する光路変更部に設けられており、
上記ラインセンサは、上記画像表示領域の外側に配置され、かつ、上記画像表示体の画像表示面に平行な受光面を有しており、
上記光路変更部は、上記画像表示領域を通過した光を、それぞれ対となるラインセンサの受光面に導光し、
上記波長選択反射ミラーが、上記画像表示面と平行な方向に延設されたひさしで覆われていることを特徴とする請求項2に記載の座標センサ。 - 上記ひさしの上記画像表示面と平行な方向に延設された長さは、上記波長選択反射ミラーの上記画像表示面と垂直な方向の長さの2倍以上、6倍以下であることを特徴とする請求項4に記載の座標センサ。
- 上記画像表示面には、上記ひさしと平面視において重なる領域に、遮光部材が設けられていることを特徴とする請求項4又は5に記載の座標センサ。
- 上記画像表示面と、上記ラインセンサの受光面との間には、空気層が設けられており、
上記ひさしと平面視において重なる領域であって、上記空気層と接する領域に、遮光部材が設けられていることを特徴とする請求項4から6のいずれか1項に記載の座標センサ。 - 上記波長選択反射ミラーにおいて、上記発光素子からの光が入射する入射部の近辺には、上記ひさしと平面視において重なる領域に、遮光スリットが設けられていることを特徴とする請求項4から7のいずれか1項に記載の座標センサ。
- 上記光路変更部および上記ラインセンサは、上記画像表示体の3辺に沿って配置され、残る1辺の両端部に上記発光素子が配置されていることを特徴とする請求項4から8のいずれか1項に記載の座標センサ。
- 上記発光素子は、可視領域以外の波長領域の光を出射することを特徴とする請求項1から9のいずれか1項に記載の座標センサ。
- 請求項1から10のいずれか1項に記載の座標センサを備えていることを特徴とする表示装置。
- 上記表示装置は、対向基板とアクティブマトリクス基板とを備えており、
上記ラインセンサは、上記アクティブマトリクス基板のアクティブ素子形成面に設けられていることを特徴とする請求項11に記載の表示装置。
Priority Applications (2)
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US13/515,296 US8736584B2 (en) | 2009-12-16 | 2010-10-26 | Coordinate sensor and display device |
BR112012015880-5A BR112012015880A2 (pt) | 2009-12-16 | 2010-10-26 | sensor de coordenadas e dispositivo de exibição |
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JP2009-285684 | 2009-12-16 | ||
JP2009285684 | 2009-12-16 |
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US (1) | US8736584B2 (ja) |
BR (1) | BR112012015880A2 (ja) |
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WO2014076992A1 (ja) * | 2012-11-13 | 2014-05-22 | 日本電気株式会社 | インターフェース装置、表示システム及び入力受付方法 |
CN109283510A (zh) * | 2018-08-17 | 2019-01-29 | 矽力杰半导体技术(杭州)有限公司 | 光感测装置和电子设备 |
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JP2014044679A (ja) * | 2012-08-28 | 2014-03-13 | Fujitsu Component Ltd | 座標検出装置 |
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- 2010-10-26 BR BR112012015880-5A patent/BR112012015880A2/pt not_active Application Discontinuation
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WO2014076992A1 (ja) * | 2012-11-13 | 2014-05-22 | 日本電気株式会社 | インターフェース装置、表示システム及び入力受付方法 |
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BR112012015880A2 (pt) | 2020-09-01 |
US20120249484A1 (en) | 2012-10-04 |
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