JP2011007956A - Writing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the time required to display a hand-written image in a display medium on which an image is written by irradiation of light.SOLUTION: When a postscript apparatus 3 is moved from a point P1 to a point P2, a first pixel group below a line connecting the point P1 and the point P2 together outputs light to the display medium 21 during the period when an orientation state of cholesteric liquid crystal of the display medium 21 is changed and stabilized. The position of a point P21 is predicted as the position to which the postscript apparatus 3 moves, and light is output from a second pixel group below the line connecting the point P2 and the point P21 together for a time shorter than that when the first pixel group outputs light. When the postscript apparatus 3 then moves to the point P21, the second pixel group outputs light, and the region at which the light arrives is already irradiated with light and the reflectance is lowered. Therefore, the time until the change in the orientation state of the cholesteric liquid crystal is short, and a user feels that the time required to display trajectory of the postscript apparatus 3 is short.

Description

  The present invention relates to a writing device.

  Patent Document 1 discloses a system for recording an image with a pen on optical writing type electronic paper. In this system, when the pen is moved on the surface of the electronic paper, the trajectory of the pen movement is stored. Then, light is emitted to the electronic paper according to the locus, and an image indicating the locus of the pen is superimposed on the image already displayed on the electronic paper.

JP 2007-241405 A

  An object of the present invention is to shorten the time until a handwritten image is displayed in a display medium on which an image is written by light irradiation.

  A writing apparatus according to a first aspect of the present invention includes a voltage applying unit that applies a voltage to a display medium whose display changes according to light irradiation and an applied voltage, and an operation that moves on the surface of the display medium. A detecting means for detecting the position of the child, and a position for changing the display in the display medium is specified using the position detected by the detecting means, and at least a predetermined first time required for changing the display; Irradiating the specified position with light, specifying the predicted position after movement of the operating element using the position detected by the detecting means, and for a second time shorter than the first time, In the display medium, there is provided a light irradiation means for irradiating light to a region between the position of the operation element and the predicted position.

  According to a second aspect of the present invention, in the writing device according to the first aspect, the display medium has a reflectivity of outside light at a position irradiated with light, and the second time includes the second time, The time for changing the reflectance is shorter than a predetermined time required for stabilizing the changed reflectance.

  According to a third aspect of the present invention, in the writing device according to the second aspect, the region irradiated with light during the second time has a width from the position of the operator toward the predicted position. Is characterized by widening.

  According to a fourth aspect of the present invention, in the writing device according to the second or third aspect, the writing unit specifies a moving speed of the operation element, and the region of the area is determined according to the specified speed. It is characterized by having different areas.

  According to a fifth aspect of the present invention, in the writing device according to any one of the second to fourth aspects, the region irradiated with light during the second time is determined from the position of the operation element. It is characterized in that the amount of light emitted is made different toward the predicted position.

According to the first aspect of the present invention, when changing the display of the display medium on which the image is written by light irradiation, the light is irradiated only to the position corresponding to the movement locus of the operation element on the display medium. In comparison, the time until the handwritten image is displayed can be shortened.
According to the second aspect of the present invention, it is possible to prevent the display from changing in the portion where the light is irradiated for the second time.
According to the third aspect of the present invention, it is possible to shorten the time until the handwritten image is displayed even if the operator moves to a position shifted from the predicted position.
According to invention of Claim 4, even if the moving speed of an operation element is quick, time until a handwritten image is displayed can be shortened.
According to the fifth aspect of the present invention, the time until the handwritten image is displayed can be shortened as the position where the operator is likely to move.

The figure which showed the apparatus of the system which concerns on one Embodiment of this invention. FIG. 3 is a block diagram showing a hardware configuration of the additional recording device 3. 3 is a schematic diagram of a cross section of the display medium 21. The figure which showed the relationship between the voltage applied to a display layer, and the reflectance of a display layer. The figure which showed the relationship between the energy of the light irradiated to the photosensitive layer, and the reflectance of a display layer. The figure which showed the relationship between the voltage applied to the conductive layer, and the reflectance of a display layer. 2 is a schematic diagram of the inside of the writing device 1. FIG. 3 is a block diagram showing a hardware configuration of the writing device 1. The figure which showed the voltage which the voltage application part 103 applies to a conductive layer. The figure for demonstrating operation | movement of embodiment. The figure for demonstrating operation | movement of embodiment. The figure for demonstrating operation | movement of embodiment. The figure for demonstrating operation | movement of embodiment. The figure for demonstrating the modification of this invention.

[Embodiment]
(overall structure)
FIG. 1 is a diagram showing the appearance of a display device 2, a writing device 1, and a write-once device 3 according to an embodiment of the present invention.

The display device 2 is a reflective display device that displays an image by reflecting light from a lighting fixture or external light such as sunlight. The display device 2 has a rectangular and plate shape, a display layer having a cholesteric liquid crystal, a photosensitive layer having a photoconductor that generates a charge in response to light, and a conductive layer sandwiching the display layer and the photosensitive layer. A display medium 21 in which layers are stacked is provided.
When the display device 2 is irradiated with light by the writing device 1 in a state where a pulsed voltage is applied to the conductive layer, the alignment state of the cholesteric liquid crystal at the position irradiated with the light changes. Then, the display layer is divided into a portion that transmits external light and a portion that reflects external light in accordance with light irradiation, and displays an image.

  The additional recording device 3 having the same shape as a writing instrument such as a pen is an operator used when additional writing of a handwritten image on the display medium 21, so that the writing device 1 can detect the position of the additional recording device 3. , An infrared output unit 33 that outputs infrared rays, and an ultrasonic output unit 34 that outputs ultrasonic waves.

The writing device 1 is a device that writes and displays an image on the display device 2 placed on the writing device 1. The writing device 1 includes a terminal electrically connected to the conductive layer of the display device 2, and a writing unit that irradiates light to the display medium 21 of the display device 2, and the conductive layer of the display device 2 through the terminal. The display device 2 is irradiated with light while applying a voltage to cause the display device 2 to display an image.
The writing device 1 also includes a sensor 104b that detects infrared rays output from the additional recording device 3 and sensors 104a and 104c that detect ultrasonic waves output from the additional recording device 3 in order to detect the position of the additional recording device 3. ing. The writing device 1 detects the position of the additional recording device 3 based on the signals output from these sensors, and detects the position of the additional recording device 3 that has moved on the surface of the display medium 21.

(Configuration of appending device 3)
FIG. 2 is a block diagram showing a hardware configuration of the appending device 3.
The infrared output unit 33 includes a light emitting diode that outputs infrared rays, and outputs infrared rays at a predetermined cycle under the control of the control unit 31. The ultrasonic output unit 34 includes an element that outputs ultrasonic waves, and outputs ultrasonic waves in synchronization with infrared rays output from the infrared output unit 33 under the control of the control unit 31. The switch 35 is a switch for switching between output / non-output of infrared rays and ultrasonic waves, and is connected to the control unit 31.
The control unit 31 includes a so-called microcomputer including a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), an input port, and an output port. The ROM stores a control program for controlling each unit. When the control program is executed by the CPU, each unit of the write-once apparatus 3 is controlled, and infrared and super The output / non-output of the sound wave is controlled.

(Configuration of display device 2)
FIG. 3 is a diagram schematically showing a cross section of the display medium 21 included in the display device 2. The display medium 21 has a configuration in which a substrate layer, a conductive layer, a display layer, a colored layer, a photosensitive layer, and a laminate layer are laminated, and the shape of each layer is rectangular. As shown in FIG. 3, the side on which the substrate layer 201 </ b> A is disposed is the side on which the user visually recognizes the image and the additional recording device 3 is in contact (display surface side), and the substrate layer 201 </ b> C is disposed. The side on which the light is output from the writing device 1 is irradiated (the writing surface side).

  The substrate layers 201 </ b> A, 201 </ b> B, and 201 </ b> C are layers that protect a portion that displays an image and maintain the shape, and the substrate layer 201 </ b> A and the substrate layer 201 </ b> C are exposed on the surface of the display device 2. The substrate layer 201B plays a role of insulating between the conductive layer 202B and the conductive layer 202C. In this embodiment, each substrate layer is formed of polyethylene terephthalate that transmits light. However, the material of each substrate layer is not limited to polyethylene terephthalate, and has transparency and insulating properties. Any other material may be used.

In the present embodiment, the conductive layers 202A, 202B, 202C, and 202D are formed of indium tin oxide, are transparent, transmit light, and have conductivity. Note that each conductive layer is not limited to indium tin oxide as long as it is transparent and transmits light, and has conductivity, and other materials may be used.
The conductive layer 202A is in contact with the writing surface side of the substrate layer 201A, and the conductive layer 202B is in contact with the display surface side of the substrate layer 201B. The conductive layer 202C is in contact with the writing surface side of the substrate layer 201B, and the conductive layer 202D is in contact with the display surface side of the substrate layer 201C.
The conductive layer 202A is connected to the terminal 203A, the conductive layer 202B is connected to the terminal 203B, the conductive layer 202C is connected to the terminal 203C, and the conductive layer 202D is connected to the terminal 203D. The terminals 203 </ b> A to 203 </ b> D are terminals to which a voltage is applied from the writing device 1, and are arranged so as to be exposed on the surface of the display device 2.

The display layer 204B in contact with the writing surface side of the conductive layer 202A, the display layer 204G in contact with the writing surface side of the display layer 204B, and the display layer 204R in contact with the writing surface side of the conductive layer 202C are made of cholesteric liquid crystal or It is a layer made of a plurality of materials such as a resin that transmits light, and has a structure in which cholesteric liquid crystal is dispersed in the resin.
In cholesteric liquid crystal, liquid crystal molecules are twisted and aligned in a spiral shape, and the alignment is changed by an electric field to change to a state of reflecting light of a specific wavelength or a state of transmitting light. In the present embodiment, the cholesteric liquid crystal of the display layer 204B reflects blue light (light having a wavelength in the range of 400 nm to 500 nm), and the cholesteric liquid crystal of the display layer 204G has green light (wavelength of 500 nm to 600 nm). The cholesteric liquid crystal of the display layer 204R is adjusted to reflect red light (light having a wavelength in the range of 600 nm to 700 nm), but the light reflected by each display layer Is not limited to those described above. A cholesteric liquid crystal material may be selected so as to reflect light in a predetermined wavelength band that is different for each display layer.
In addition, the resin used in each display layer has a function of holding cholesteric liquid crystal and suppressing liquid crystal flow (change in image), and is not soluble in liquid crystal material or compatible with liquid crystal. A polymer material using a liquid as a solvent is used. In addition, the resin used for each display layer has a strength that can withstand external force and is transmissive to light.

The photosensitive layer 205R in contact with the display surface side of the conductive layer 202B and the photosensitive layer 205BG in contact with the display surface side of the conductive layer 202D are layers in which a photoelectric effect occurs. In this embodiment, the charge generation layer 2051 is formed. , 2053 and a charge transport layer 2052, and a charge generation layer 2051, a charge transport layer 2052, and a charge generation layer 2053 are stacked in this order.
When the photosensitive layer is irradiated with light, the resistance value of the portion irradiated with the light decreases. The voltage applied to the conductive layer sandwiching the display layer and the photosensitive layer is divided between the display layer and the photosensitive layer, but when the resistance value of the photosensitive layer decreases, the voltage division ratio changes and the voltage applied to the display layer increases. To do.

The charge generation layer 2051 and the charge generation layer 2053 are layers that absorb light and generate photocarriers. The charge generation layer 2051 affects the amount of photocarriers flowing from the conductive layer on the display surface side to the conductive layer on the irradiation side, and the charge generation layer 2053 is a conductive layer on the display surface side from the conductive layer on the irradiation side. The amount of optical carriers flowing in the direction of
The charge transport layer 2052 is a layer having a function of drifting in the direction of an electric field generated by a voltage applied to the conductive layer by injecting photocarriers generated in each charge generation layer.
In the present embodiment, the charge generation layer of the photosensitive layer 205R includes a red charge generation material (for example, dibromoanthanthrone) and absorbs blue to green light. The charge generation layer of the photosensitive layer 205BG has blue and green charge generation materials (for example, titanyl phthalocyanine) and absorbs red light.

The laminate layer 207 between the photosensitive layer 205R and the display layer 204G and between the photosensitive layer 205BG and the display layer 204R is provided for the purpose of absorbing unevenness and bonding when the display layer is bonded to the colored layer. Layer. The laminate layer 207 is made of a polymer material having a low glass transition point, and a material that can adhere and bond the display layer and the photosensitive layer by heat or pressure is selected. Further, it is transparent to at least incident light.
As a material used for the laminate layer 207, an adhesive polymer material (for example, urethane resin, epoxy resin, acrylic resin, silicone resin) can be used.

In the display medium 21 in which these layers are laminated, the cholesteric liquid crystal in the display layer has a planar phase as the applied voltage increases when the initial state before the voltage is applied is the planar phase. When the initial state is the focal conic phase, the focal conic phase and the homeotropic phase are changed in the order of the focal conic phase and the homeotropic phase.
When the voltage is removed in the focal conic phase state, the cholesteric liquid crystal maintains the focal conic phase state, and when the voltage is removed in the homeotropic phase state, the cholesteric liquid crystal changes from the homeotropic phase to the planar phase. Change and keep the planar phase state.

  4A and 4B are diagrams showing the relationship between the voltage applied to the entire display layer via the conductive layer and the photosensitive layer and the reflectance of light in the display layer. Curve R in a) shows the relationship between the applied voltage and the light reflectance in the display layer 204R. A curve G in FIG. 4B shows the relationship between the applied voltage and the reflectance of light in the display layer 204G, and a curve B in FIG. The relationship with the reflectance of the light in the display layer 204B is shown.

  In the display layer 204B, when the voltage threshold when changing from the planar phase or the focal conic phase to the focal conic phase is Vb1, and the voltage threshold when changing from the focal conic phase to the homeotropic phase is Vb2, the voltage before conducting the voltage removal becomes conductive. When the voltage applied through the layer and the photosensitive layer is Vb2 or more, the cholesteric liquid crystal becomes a planar phase after voltage removal and reflects blue light in the outside light. On the other hand, when the voltage applied through the conductive layer and the photosensitive layer before voltage removal is a voltage between Vb1 and Vb2, the cholesteric liquid crystal becomes a focal conic phase after voltage removal and transmits external light. To do.

  Further, assuming that the voltage threshold when the display layer 204G changes from the planar phase or the focal conic phase to the focal conic phase is Vg1, and the voltage threshold when the voltage changes from the focal conic phase to the homeotropic phase is Vg2, before voltage removal. When the voltage applied through the conductive layer and the photosensitive layer is Vg2 or more, the cholesteric liquid crystal becomes a planar phase after voltage removal and reflects green light in the outside light. On the other hand, when the voltage applied through the conductive layer and the photosensitive layer before voltage removal is a voltage between Vg1 and Vg2, the cholesteric liquid crystal becomes a focal conic phase after voltage removal and transmits external light. To do.

  Further, when the voltage threshold when changing from the planar phase or the focal conic phase to the focal conic phase in the display layer 204R is Vr1, and the voltage threshold when changing from the focal conic phase to the homeotropic phase is Vr2, before voltage removal. When the voltage applied through the conductive layer and the photosensitive layer is Vr2 or more, the cholesteric liquid crystal becomes a planar phase after voltage removal and reflects red light in the outside light. On the other hand, when the voltage applied through the conductive layer and the photosensitive layer before voltage removal is a voltage between Vr1 and Vr2, the cholesteric liquid crystal becomes a focal conic phase after voltage removal and transmits external light. To do.

  As described above, the cholesteric liquid crystal of each display layer has a threshold voltage (first threshold value (Vr1, Vg1, Vb1)) when the applied voltage changes from the planar phase (or focal conic phase) to the focal conic phase: display. When the reflectivity of the layer exceeds 10%), the voltage changes to the focal conic phase, and the voltage threshold (second) when the voltage value of the applied voltage changes from the focal conic phase to the homeotropic phase. When the threshold value (Vr2, Vg2, Vb2): voltage when the reflectance of the display layer becomes 90%, the phase changes to a homeotropic phase.

  Next, FIG. 5 is a graph showing the relationship between the light energy (exposure energy) irradiated to the photosensitive layer 205R when a voltage is applied to the conductive layer and the reflectance of the display layer 204B. As shown in FIG. 5, in the display layer, the reflectance of the display layer decreases as the exposure energy applied to the photosensitive layer increases. In other words, in order to change the alignment state of the cholesteric liquid crystal in the display layer to the focal conic phase so that external light is transmitted, it is necessary to supply exposure energy of a certain threshold value or more to the photosensitive layer. The exposure energy depends on the amount of light irradiated to the photosensitive layer and the exposure time. Therefore, when the exposure energy that changes the alignment state of the cholesteric liquid crystal is supplied to the photosensitive layer, the amount of light irradiated on the photosensitive layer is constant. If so, the exposure energy supplied to the photosensitive layer depends on the light irradiation time.

FIG. 6 is a graph showing the relationship between the voltage applied to the conductive layer and the reflectance of the display layer 204B when the photosensitive layer 205R is irradiated with a certain amount of light for each light irradiation time.
In FIG. 6, the graph connecting the points indicated by “■” is a graph when the voltage applied to the conductive layer is changed by setting the light irradiation time to 10 [ms], and the graph indicated by “◯”. These are graphs when the voltage applied to the conductive layer is changed with the light irradiation time of 20 [ms]. The graph indicated by “x” is a graph when the voltage applied to the conductive layer is changed with the light irradiation time being 40 [ms], and the graph indicated by “*” is the light irradiation time. It is a graph when changing the voltage applied to an electroconductive layer by setting to 60 [ms]. The graph indicated by “●” is a graph when the voltage applied to the conductive layer is changed with the light irradiation time being 100 [ms], and the graph indicated by “♦” is the light irradiation time. It is a graph when changing the voltage applied to a conductive layer by setting 200 to [ms].
Referring to FIG. 6, even when the amount of light applied to the photosensitive layer is constant and the voltage applied to the conductive layer is the same, the reflectance varies depending on the light irradiation time, and the reflection is increased as the light irradiation time increases. The rate is falling. In other words, even if the light amount is the same and the voltage applied to the conductive layer is the same voltage, the reflectance does not decrease if the light irradiation time is short. Thus, it is necessary to irradiate the photosensitive layer with light for a predetermined time or more.

(Configuration of writing device 1)
FIG. 7 is a schematic diagram of the inside of the writing device 1, and FIG. 8 is a block diagram showing the hardware configuration of the writing device 1.

The writing unit 102 has a function of irradiating the display medium 21 with light, and is controlled by the control unit 101 to irradiate the photosensitive layers 205R and 205BG of the display medium 21 with light. This light has a peak intensity in the wavelength range of light absorbed by the photosensitive layer 205R and the photosensitive layer 205BG, and has a narrow bandwidth. Further, this light spectrum is a spectrum that contains a lot of energy in the wavelength region of the light absorbed by the photosensitive layers 205R and 205BG.
Specifically, the writing unit 102 includes a transmissive liquid crystal panel having a plurality of pixels configured with three colors of red, green, and blue, and a liquid crystal display 102A including a backlight that functions as a light source. The light output from the backlight passes through the liquid crystal panel and is applied to the writing surface side of the display device 2 fixed above the liquid crystal panel. The liquid crystal display 102A is controlled by the control unit 101 to control pixels that output light.

In addition, the structure which irradiates light to the display medium 21 is not limited to the structure mentioned above, As a light source, any one of a cold-cathode tube, a xenon lamp, a halogen lamp, EL (Electro Luminescence), and a light-guide plate, for example There is a light source that combines.
Further, the display medium 21 may be a surface emitting display device (for example, CRT (Cathode Ray Tube), PDP (Plasma Display Panel), EL, FED (Field Emission Display), or SED (Surface-conduction Electron-emitter Display)). You may irradiate light.

  The voltage application unit 103 includes a terminal connected to the terminal 203A and a terminal connected to the terminal 203B, and a circuit for applying a pulse voltage to the conductive layer 202A and the conductive layer 202B using these terminals. I have. The voltage application unit 103 includes a terminal connected to the terminal 203C and a terminal connected to the terminal 203D, and applies a pulsed voltage to the conductive layer 202C and the conductive layer 202D using these terminals. .

  The sensor unit 104 includes a sensor 104b that detects infrared rays output from the additional recording device 3, and sensors 104a and 104c that detect ultrasonic waves output from the additional recording device 3. When the sensor 104b detects infrared rays, the sensor 104b outputs a signal indicating that the infrared rays have been detected to the control unit 101. Further, when detecting the ultrasonic wave, the sensors 104a and 104c output a signal indicating that the ultrasonic wave has been detected to the control unit 101.

The operation unit 106 includes a liquid crystal display 106A that displays an image and a touch panel 106B that is transparent and disposed on the surface of the liquid crystal display 106A. A screen for operating the writing device 1 is displayed on the liquid crystal display 106A under the control of the control unit 101. The touch panel 106 </ b> B outputs a signal indicating the position touched by the user to the control unit 101.
The storage unit 107 includes a nonvolatile memory, and stores position data indicating the position of the additional recording device 3 moved on the surface of the display device 2.

  The control unit 101 has a so-called microcomputer including a CPU, a ROM, a RAM, an input port, an output port, and the like. The ROM stores a control program for controlling each unit. When the control program is executed by the CPU, each unit of the writing device 1 is controlled. Further, when the control program is executed, a function of detecting the position of the additional recording device 3 and storing position data indicating the detected position is realized. Further, when the control program is executed, an additional recording function for displaying a handwritten image on the display device 2 using the additional recording device 3 is realized.

(Operation of the embodiment)
Next, in this embodiment, the operation when displaying a handwritten image on the display medium 21 by the additional recording device 3 will be described.
First, the display device 2 is mounted on the writing device 1 as shown in FIG. 1, and the voltage application unit 103 and the terminals 203A to 203D are electrically connected.
Here, when an operation to initialize the screen of the display medium 21 is performed on the touch panel 106B, the control unit 101 first controls the voltage application unit 103 and the writing unit 102 to display the display layer 204B, the display layer 204G, and the display layer. The alignment state of the 204R cholesteric liquid crystal is changed to a planar phase.
Specifically, the voltage application unit 103 applies the alternating pulse voltage (hereinafter referred to as pulse voltage) illustrated in FIG. 9 to the terminal 203A and the terminal 203B. Here, the voltage divided from the conductive layer to the display layer 204B and the display layer 204G is equal to or higher than Vg2, and the alignment state of the display layer 204B and the display layer 204G is a homeotropic phase. After the alignment state becomes the homeotropic phase, the application of the pulse voltage to the conductive layer is stopped, the alignment state of the display layers 204B and 204G becomes the planar phase, and the display layer 204B is light of the blue wavelength in the external light. The display layer 204G is in a state of reflecting light having a green wavelength in external light.
Further, the voltage application unit 103 applies a pulse voltage to the terminal 203C and the terminal 203D. Here, the voltage applied to the display layer 204R is a voltage equal to or higher than Vr2, and the orientation state of the display layer 204R is a homeotropic phase. After the alignment state becomes the homeotropic phase, the application of the pulse voltage is stopped, the alignment state of the display layer 204R becomes the planar phase, and the display layer 204R reflects the light having the red wavelength in the external light. Become.

  Next, when the user operates the touch panel 106 </ b> B and performs an operation for instructing to start writing a handwritten image, the control unit 101 starts monitoring the signal output from the sensor unit 104. Further, the control unit 101 controls the voltage application unit 103 to apply a pulse voltage to the terminals 203A to 203D. Note that the pulse voltage applied from the terminals 203A and 203B is set to a voltage that is divided into the display layers 204B and 204G to make the voltage applied to Vb3, and the pulse voltage applied from the terminals 203C and 203D is a display voltage. The voltage applied to the layer 204R is set to a voltage that makes Vr3.

  Next, when the user positions the additional recording device 3 on the surface of the display device 2 and operates the switch 35, infrared rays are periodically output from the infrared output unit 33 and ultrasonic waves are periodically output from the ultrasonic output unit 34. Are output from the appending device 3. The infrared rays periodically output from the additional recording device 3 are detected by the sensor 104b, and the ultrasonic waves output in synchronization with the infrared rays from the additional recording device 3 are detected by the sensors 104a and 104c.

  When the sensor 104b detects infrared rays, a signal indicating that infrared rays have been detected is output to the control unit 101. When the sensors 104 a and 104 c detect the ultrasonic wave, a signal indicating that the ultrasonic wave has been detected is output to the control unit 101. The control unit 101 obtains the position of the write-once device 3 using mathematical trigonometry using the time difference between the signals output from the sensors and the distance between the sensors 104a and 104b stored in advance. Position data indicating the obtained position is generated. That is, each sensor and the control unit 101 function as a detection unit that detects the position of the additional recording device 3 located on the surface of the display medium 21. In addition, the control part 101 calculates | requires the position of the postscript apparatus 3 whenever a signal is input from a sensor, and produces | generates position data, whenever a position is calculated | required.

  The control unit 101 controls the liquid crystal display 102A based on the position represented by the position data. In the present embodiment, the control unit 101 previously stores the detected position of the additional recording device 3 and the position of the pixel of the liquid crystal display 102 </ b> A that outputs light corresponding to this position. The position of the pixel corresponding to the position of the additional recording device 3 is specified, and the liquid crystal display 102A is controlled so that light is output from the specified pixel.

  For example, as shown in FIG. 10, when the appending device 3 is located on the surface of the display medium 21 and the position data indicating the position of the point P1 on the display medium 21 is generated by the control unit 101, the control unit 101 Based on this position data, the pixel G1 below the point P1 in the liquid crystal display 102A is specified, and the liquid crystal display 102A is controlled so that light is output from the pixel G1. In this embodiment, the pixel G1 outputs light for a predetermined time necessary for changing the alignment state of the cholesteric liquid crystal and stabilizing the alignment state, and when this time elapses, the light output is performed. Is controlled to be stopped.

The light output from the pixel G1 of the liquid crystal display 102A enters the display medium 21 from the writing surface side. Of the light output from the pixel G1, light having a red wavelength causes a photoelectric effect in the photosensitive layer 205BG. Then, in the portion of the display layer 204R located above the region where the photoelectric effect is generated in the photosensitive layer 205BG, the applied voltage increases to a voltage between Vr1 and Vr2, and the alignment state of the cholesteric liquid crystal changes to the focal conic state. The phase shifts to the point P1, and the red light is transmitted.
Of the light output from the pixel, light of blue-green wavelength causes a photoelectric effect in the photosensitive layer 205R. Then, in a portion of the display layer 204B and the display layer 204G located above the region where the photoelectric effect is generated in the photosensitive layer 205R, the applied voltage increases to a voltage between Vg1 and Vb2, and the orientation of the cholesteric liquid crystal The state shifts to the focal conic phase, and the point P1 portion of the display layer 204B transmits blue light, and the point P1 portion of the display layer 204G transmits green light.
That is, since the external light is transmitted without reflecting at the point P1, the part below the point P1 is visually recognized by the user as black.

  Next, when the user moves the additional recording device 3 from the position of the point P1 to the position of the point P2 as shown in FIG. 11A, position data indicating the position of the additional recording device 3 after the movement is generated. . Based on the position data, the control unit 101 specifies the first pixel group below the line connecting the points P2 and P1 on the liquid crystal display 102A. Further, the control unit 101 predicts a position where the additional recording device 3 moves based on the position data of the point P1 and the position data of the point P2.

As shown in FIG. 11A, when the corner of the display medium 21 is the origin of coordinates, the coordinate of the point P1 is (x1, y1), and the coordinate of the point P2 is (x2, y2), control is performed. The unit 101 calculates a straight line L1 passing through the coordinates (x1, y1) and the coordinates (x2, y2).
Next, the control unit 101 sets the coordinates (x21, y21) of the point P21 at a predetermined distance in the opposite direction to the point P1 when viewed from the coordinates (x2, y2) on the straight line L1, and then the additional recording device 3 The position is calculated as the position to be moved (predicted position), and the second pixel group below the line connecting the coordinates (x2, y2) and the coordinates (x21, y21) is specified.

As shown in FIG. 12, the control unit 101 controls the liquid crystal display 102A so that light is output from the identified first pixel group. Here, the first pixel group outputs light for a predetermined time necessary for changing the alignment state of the cholesteric liquid crystal and stabilizing the alignment state, and when this time elapses, the light output is reduced. Controlled to be stopped.
Further, the control unit 101 controls the liquid crystal display 102A so that light is output from the second pixel group. Here, the second pixel group outputs light for a time shorter than a predetermined time necessary for stabilizing the alignment state of the cholesteric liquid crystal, and the light output is stopped after this time has elapsed. Controlled.
That is, the writing unit 102 and the control unit 101 function as light irradiation means for irradiating the display medium 21 with light.

When the light output from the first pixel group reaches the display medium 21 and the alignment state of the cholesteric liquid crystal in the display layer changes, the first pixel group in the display medium 21 is the same as when the light is output from the pixel G1. The portion located above is visually recognized by the user as black.
On the other hand, when the light output from the second pixel group reaches the display medium 21, the portion of the display medium 21 located above the second pixel group is irradiated with light, so that the alignment state of the cholesteric liquid crystal changes. The reflectance decreases. However, since the light output from the second pixel group is irradiated only for a time shorter than a predetermined time necessary to stabilize the alignment state, the portion located above the second pixel group is finally Does not shift to the focal conic phase and is not visible to the user as black.

Next, as shown in FIG. 11B, when the additional recording device 3 moves to the position of the point P21, the control unit 101 obtains position data indicating the position of the point P21. Based on the position data, the control unit 101 specifies the first pixel group below the line connecting the points P21 and P2 on the liquid crystal display 102A.
Moreover, the control part 101 estimates the position where the additional recording apparatus 3 moves based on the position of the point P2 and the point P21. Here, as shown in FIG. 11B, when the coordinates of the point P2 are (x2, y2) and the coordinates of the point P21 are (x21, y21), the coordinates (x2, y2) and the coordinates ( A straight line L2 passing through x21, y21) is calculated.
Next, the control unit 101 sets the coordinates (x22, y22) of the point P22 at a predetermined distance in the opposite direction to the point P2 when viewed from the coordinates (x21, y21) on the straight line L2, and the appending device 3 thereafter The position is calculated as the moving position, and the second pixel group below the line connecting the coordinates (x21, y21) and the coordinates (x22, y22) is specified.

As illustrated in FIG. 13, the control unit 101 controls the liquid crystal display 102 </ b> A so that light is output from the identified first pixel group. Here, the first pixel group outputs light for a predetermined time necessary for changing the alignment state of the cholesteric liquid crystal and stabilizing the alignment state, and when this time elapses, the light output is reduced. Controlled to be stopped.
Note that the portion of the display medium 21 where the light output from the first pixel group arrives is already irradiated with light when the additional recording device 3 moves from the point P1 to the point P2, and the reflectance is reduced.
For this reason, when light is irradiated from the first pixel group, the time until the alignment state of the cholesteric liquid crystal changes to the focal conic phase is compared with a configuration in which light is not irradiated to the predicted position of movement of the additional recording device 3 The user of the appending device 3 is short and feels a short time until the locus of the appending device 3 is displayed.

  When the user moves the appending device 3 away from the display medium 21 and performs an operation for instructing the end of image writing on the touch panel 106B, the backlight of the liquid crystal display 102A is turned off. At this time, the portion of the locus on which the additional recording device 3 has moved is irradiated with light for a certain period of time and the orientation state of the cholesteric liquid crystal is in the focal conic phase, and is visually recognized as a black line image.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows.

In the above-described embodiment, the position of the additional recording device 3 is detected using infrared rays and ultrasonic waves, but the method of detecting the position of the additional recording device 3 is not limited to the method of the above-described embodiment. Absent.
For example, the writing device 1 may be configured such that a touch panel having the same area as the display medium 21 or an area larger than the area of the display medium 21 is positioned above the display device 2. Then, after the user places the display device 2 behind the touch panel, the user moves the tip of the additional recording device 3 while making contact with the touch panel, and the writing device 1 determines the position where the additional recording device 3 is in contact with the touch panel. It may be detected to control the liquid crystal display 102A.
Further, a touch panel is arranged on the display surface side of the display medium 21, and when the touch panel is placed on the writing device 1, the display device 2 and the writing device 1 are electrically connected. The writing device 1 is a signal output from the touch panel. The liquid crystal display 102 </ b> A may be controlled by detecting the contact position of the additional recording device 3.

  In the above-described embodiment, a light source may be provided at the tip of the additional recording device 3, and the light output from the light source may be irradiated onto the display medium 21. According to this configuration, light is emitted from the write-once device 3 in addition to the liquid crystal display 102A, and therefore, the locus of the write-once device 3 is displayed more quickly than the configuration in which light is emitted only by the liquid crystal display 102A. .

In the embodiment described above, the writing device 1 predicts the movement position of the additional recording device 3 using two positions among the detected positions of the additional recording device 3, but predicts the movement position of the additional recording device 3. The method to do is not limited to this method.
For example, the movement position of the appending device 3 may be predicted using three or more positions. When the movement position of the additional recording device 3 is predicted using three or more positions, the movement path of the additional recording device 3 is predicted using an n-order function, a spline curve, a Bezier curve, etc., and the position on the predicted route is determined. The moving position of the additional recording device 3 may be used.
When the movement position of the additional recording device 3 is predicted, the period of detecting the position of the additional recording device 3 and the movement distance of the additional recording device (for example, the latest position of the detected additional recording device 3 and the latest position one before the latest position). The movement speed of the write-once apparatus 3 may be calculated from the distance between the positions of the write-once apparatus 3 and the movement position of the write-once apparatus 3 may be predicted using this movement speed. Specifically, as the predicted moving speed increases, the predicted position after movement of the additional recording device 3 may be set to a position away from the position of the additional recording device 3. According to this configuration, even when the moving speed of the additional recording device 3 is fast, the time until the handwritten image is displayed can be shortened.

In the embodiment described above, when irradiating light from the position of the additional recording device 3 to the predicted position after the additional recording device 3 is moved, the linear region R is irradiated as shown in FIG. As shown in FIG. 14B, the area to be irradiated with light may be widened away from the position of the additional recording device 3. In this configuration, the shape of the region irradiated with light may be the shape shown in FIGS. 14C and 14D. 14A to 14D, the left end of the region R is the position of the additional recording device 3, and the right end of the region R is the predicted position after the additional recording device 3 is moved. According to these configurations, even if the additional recording device 3 moves to a position shifted from the predicted position, the time until the handwritten image is displayed can be shortened.
In the above-described embodiment, the amount of light to be irradiated may be reduced as the position of the appending device 3 is increased. According to this structure, the time until the handwritten image is displayed can be shortened as the position where the additional recording device 3 is likely to move.

  In the embodiment described above, the movement trajectory of the additional recording device 3 is displayed on the display medium 21, but the writing device 1 acquires image data representing an image from the computer device via a communication line, and the image of the acquired image data is acquired. May be displayed on the display medium 21. Also, not a communication line, but a magnetic recording medium (magnetic tape, magnetic disk (HDD (Hard Disk Drive), FD (Flexible Disk), etc.)), optical recording medium (optical disc (CD (Compact Disc)), DVD (Digital Versatile Disk). )), Etc.), a device for reading data stored in a recording medium such as a magneto-optical recording medium or a semiconductor memory is provided in the writing device 1, and the image data stored in the recording medium is read to display an image of the image data. Also good. Moreover, in these structures, you may add the movement locus | trajectory of the additional recording apparatus 3 with the operation | movement mentioned above with respect to the displayed image.

DESCRIPTION OF SYMBOLS 1 ... Writing apparatus, 2 ... Display apparatus, 3 ... Additional recording apparatus, 101 ... Control part, 102 ... Writing part, 102A ... Liquid crystal display, 103 ... Voltage application part, 104 ... sensor unit, 106 ... operation unit, 106A ... liquid crystal display, 106B ... touch panel, 107 ... storage unit, 21 ... display medium, 201A to 201C ... substrate layer, 202A to 202D ... conductive layer, 203A to 203D ... terminal, 204B, 204G, 204R ... display layer, 205R, 205BG ... photosensitive layer, 207 ... laminate layer, 31 ... control unit 33 ... Infrared output unit, 34 ... Ultrasonic output unit, 35 ... Switch

Claims (5)

Voltage application means for applying a voltage to a display medium whose display changes according to light irradiation and applied voltage;
Detecting means for detecting a position of an operator moving on the surface of the display medium;
The position where the display is changed in the display medium is specified by using the position detected by the detecting means, and at least a predetermined first time required for changing the display is transmitted to the specified position. Irradiate and specify the predicted position after movement of the operating element using the position detected by the detecting means, and for a second time shorter than the first time, the position of the operating element and the position on the display medium A light irradiation means for irradiating light to a region between the predicted position;
A writing device. In the display medium, the reflectance of external light changes at a position where light is irradiated,
2. The writing device according to claim 1, wherein the second time is a time for changing the reflectance and is shorter than a predetermined time required for stabilizing the changed reflectance. .   3. The writing apparatus according to claim 2, wherein a region irradiated with light during the second time is wider from the position of the operation element toward the predicted position. 4.   4. The writing apparatus according to claim 2, wherein the writing unit specifies a moving speed of the operation element and varies the area of the region according to the specified speed. 5.   The region irradiated with light during the second time varies the amount of light emitted as it goes from the position of the operating element toward the predicted position. Writing device as described in.

Images