JP2016151769A - Display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display panel capable of reducing the used amount of an infrared ray diffusion reflection material or an infrared ray absorption material as possible and easy-to-manufacture at a low cost.SOLUTION: The display panel constitutes a display control system together with an optical device which outputs non-visible light and receives the reflected non-visible light. The display panel has a diffusion reflection layer which has a surface configuration diffusing at least a part of non-visible light output from an optical device and reflects the same to an optical device. The surface of the display panel is formed with the diffusion reflection layer and is flattened in accordance with a predetermined rule in order to allow the optical device to identify a piece of positional information pointed on the display panel.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a display panel that forms a display control system together with an optical device that emits invisible light and receives reflected invisible light.

  A technique for reading a position information pattern representing a coordinate position on a plane of a display device using a pen-type reading device is known. The reading device receives the invisible light reflected by the display device after emitting the invisible light, and specifies the coordinate position indicated on the display device based on the received invisible light. For example, the Example using an optical film like patent document 1 is known.

JP 2008-209598 A

  In the configuration of the optical film of Patent Document 1, two types of functional materials having different properties of the infrared diffuse reflection material and the infrared absorption material are necessary. At this time, it is desirable that the infrared diffuse reflection material and the infrared absorption material are ideally completely transparent in the visible wavelength region. In practice, however, both infrared diffuse reflective materials and infrared absorbing materials have some reflection or absorption characteristics in the visible wavelength range. Therefore, there is a problem that the display device is slightly colored and the image quality of the display device is deteriorated. Therefore, it is desirable to reduce the amount of the infrared diffuse reflection material or infrared absorption material as much as possible.

  In addition, since two different types of functional materials are used, the cost of the materials is expensive, and the manufacturing process is complicated.

  The present disclosure has been made in view of the above problems, and provides a display panel that can reduce the amount of infrared diffuse reflective material or infrared absorbing material as much as possible, is cheaper, and is easier to manufacture. .

  In order to solve the above problems, a display panel of the present disclosure is a display panel that forms a display control system together with an optical device that emits invisible light and receives reflected invisible light, and is emitted from the optical device. A diffuse reflection layer having a surface shape for diffusing at least a part of the invisible light and reflecting to the optical device; and position information formed on the surface of the diffuse reflection layer, the optical device pointing on the display panel Is a display panel in which the surface shape is flattened according to a predetermined rule.

  Preferably, the region where the surface shape is flattened is a region where dots formed according to a predetermined rule are formed in the diffuse reflection layer.

  Preferably, in the diffuse reflection layer, the planarization is performed by setting the surface roughness lower than the surface roughness of the peripheral region.

  According to the present disclosure, it is possible to reduce the usage amount of the infrared diffuse reflection material or the infrared absorption material as much as possible, and to provide a display panel that is cheaper and easier to manufacture.

The image figure which shows the external appearance of the display control system 100 The block diagram which shows the structure of the display control system 100 Sectional drawing of the display panel 210 concerning Embodiment 1. FIG. The expanded sectional view of the display panel 210 concerning Embodiment 1. FIG. Imaging image of dot pattern according to the first embodiment Diagram for explaining surface roughness Ry Enlarged image for explaining the dot pattern Schematic for explaining that the information obtained by quantifying the position of the dot 411 differs depending on the position of the dot 411. Flowchart showing operation of display control system 100

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

In addition, the inventor provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the claimed subject matter. .
(Embodiment 1)
FIG. 1 is an image diagram illustrating an appearance of a display control system 100 according to the first embodiment. The display control system 100 includes a display device 200 and an optical digital pen (hereinafter simply referred to as “digital pen”) 300. The display device 200 includes a display panel 210. On the surface of the display panel 210, a display surface capable of displaying an image or the like is defined.

  On the display surface of the display panel 210, a dot pattern representing information on the position on the display panel 210 is provided. The digital pen 300 optically reads the dot pattern at the pen tip position, thereby detecting information on the position on the display panel 210 where the tip of the digital pen 300 is located (hereinafter also referred to as “position information”). be able to. The display device 200 and the digital pen 300 are in wireless communication, and the digital pen 300 transmits the detected position information to the display device 200. Thereby, the display apparatus 200 can grasp position information indicating the pen tip position of the digital pen 300 and performs various display controls.

  For example, assume that the tip of the digital pen 300 is moved on the display panel 210. At this time, the digital pen 300 detects continuous position information as a locus of the tip of the digital pen 300 from the dot pattern continuously read. The digital pen 300 sequentially transmits the detected position information to the display device 200. Thereby, the display device 200 can continuously display dots on the display panel 210 according to the locus of the tip of the digital pen 300. Using this function, the user can input characters, figures, and the like on the display panel 210 by handwriting with the digital pen 300.

[2. Configuration of Display Control System 100]
Next, the configuration of the display control system 100 will be described. FIG. 2 is a block diagram illustrating a configuration of the display control system 100.

  The display device 200 includes a display panel 210, a receiving unit 230, a display side microcomputer 240, and a display device side memory 250. The display device 200 may have other electrical configurations, but the description is omitted.

  The display panel 210 can display an image in accordance with control from the display control microcomputer 240. The display panel 210 can be realized by, for example, a liquid crystal display method or an organic EL method. Details of the layer structure of the display panel 210 will be described later.

  The receiving unit 230 receives a signal transmitted from the digital pen 300. The receiving unit 230 transmits the received signal to the display side microcomputer 240.

  The display-side microcomputer 240 includes a CPU and a memory. The display-side microcomputer 240 controls the content displayed on the display panel 210 based on the signal transmitted from the digital pen 300.

  The display device side memory 250 stores a program for operating the CPU of the display side microcomputer 240. The display-side microcomputer 240 can read and write information from the display device-side memory 250 as appropriate.

  Next, a detailed configuration of the digital pen 300 will be described with reference to FIG.

  The digital pen 300 includes a cylindrical main body case 310 and a pen tip portion 320 attached to the tip of the main body case 310. The digital pen 300 includes a pressure sensor 330, an objective lens 340, an image sensor 350, a pen side microcomputer 360, a pen side memory 390, a transmission unit 370, and an illumination unit 380 inside the main body case 310.

  The main body case 310 has the same outer shape as a general pen and is formed in a cylindrical shape. The pen tip portion 320 is formed in a tapered shape. The tip of the pen tip 320 is rounded to the extent that the surface of the display panel 210 is not damaged. Note that the shape of the pen tip portion 320 is preferably a shape that allows the user to easily recognize an image displayed on the display panel 210.

  The pressure sensor 330 is built in the main body case 310 and connected to the proximal end portion of the pen tip portion 320. The pressure sensor 330 detects the pressure applied to the pen tip portion 320 and transmits the detection result to the pen-side microcomputer 360. Specifically, the pressure sensor 330 detects the pressure applied from the display panel 210 to the pen tip portion 320 when the user enters characters or the like on the display panel 210 using the digital pen 300. The pressure sensor 330 is used, for example, when determining whether or not the user intends to input using the digital pen 300.

  The irradiation unit 380 is provided at the tip of the main body case 310 and in the vicinity of the pen tip unit 320. The irradiation part 380 is comprised by infrared LED, for example. The irradiation unit 380 is provided to irradiate infrared light from the front end of the main body case 310 when the user's input intention is determined based on the detection result of the pressure sensor 320.

  The objective lens 340 causes the image sensor 350 to form an image of light incident from the pen tip side. The objective lens 340 is provided at the distal end portion of the main body case 310 and in the vicinity of the pen tip portion 320. When infrared light is irradiated from the irradiation unit 380 with the tip of the digital pen 300 facing the display surface of the display device 200, the infrared light is incident on the display panel 210 and diffusely reflected in the display panel 210. As a result, part of the infrared light transmitted through the display panel 210 returns to the digital pen 300 side. Infrared light that is emitted from the irradiation unit 380 and diffusely reflected by the display device 200 is incident on the objective lens 340. The image sensor 350 is provided on the optical axis of the objective lens 340. Therefore, the infrared light that has passed through the objective lens 340 is imaged on the imaging surface of the image sensor 350.

  The image sensor 350 outputs an image signal obtained by converting an optical image formed on the imaging surface into an electrical signal to the pen-side microcomputer 360. The image sensor 350 is configured by, for example, a CCD image sensor or a CMOS image sensor. As will be described in detail later, the display panel 210 has a dot pattern formed of dots 411. The dots 411 are formed of a material that absorbs infrared light (a material with low transmittance with respect to infrared light). Therefore, the infrared light hardly returns to the digital pen 300 from the dots 411 constituting the dot pattern. On the other hand, more infrared light returns from the area between the dots 411 than from the area of the dots 411. As a result, an optical image in which the dot pattern is expressed in black is captured by the image sensor 350.

  The pen-side microcomputer 360 specifies position information on the display panel 210 of the digital pen 300 based on an image signal generated by imaging by the image sensor 350. Specifically, the pen-side microcomputer 360 acquires the pattern shape of the dot pattern from the image signal generated by imaging by the image sensor 350, and specifies the position of the pen tip 320 on the display panel 210 based on the pattern shape. .

  The pen side memory 390 stores a program for operating the CPU of the pen side microcomputer 360. The pen side microcomputer 360 can read and write information from the pen side memory 390 as appropriate.

  Transmitter 370 transmits the signal to the outside. Specifically, the transmission unit 370 transmits the position information specified by the pen-side microcomputer 360 to the reception unit 230 of the display device 200 that is a wireless communication partner.

[3. Details of Configuration of Display Panel 210]
Next, details of the configuration of the display panel 210 will be described. FIG. 3 is a cross-sectional view of the display panel 210 according to the first embodiment.

  As shown in FIG. 3, the display panel 210 includes an optical film 400, a touch sensor glass 440, a liquid crystal panel 450, and a backlight device 460.

  The optical film 400 includes a transparent adhesive layer 431, an infrared reflective layer 432, and an uneven base material 433.

  The upper part in the figure of the concavo-convex base material 433 is a user-side surface and is a smooth surface. The upper portion of the uneven substrate 433 in the drawing may be coated with a hard coat material on a smooth surface for the purpose of protection and scratch prevention.

  The concavo-convex base material 433 has a concavo-convex surface 434 having a fine concavo-convex shape in which an inclination at a predetermined angle with respect to a reference surface is defined in order to improve infrared reflection performance. As an example, in the concavo-convex base material 433, when the absolute angle (<90 °) at which each concavo-convex shape of the concavo-convex surface 434 is inclined with respect to the reference surface is an absolute inclination angle θ, the absolute inclination angle θ of the concavo-convex surface 434 is 25 The distribution rate f (° = 25 °) at 0.5 ° is 0.5 (% / °) or more, and the absolute inclination angle θ of the uneven surface 434 is 40 ° or more in the effective total area of the uneven substrate 433. The ratio of the projected area occupied by a certain region is set to 20% or less. Here, the distribution rate f (θ) is expressed by the following equation.

(Equation 1)
Distribution rate f (θ) = (ds / Sa) / dθ (1)
Sa represents the effective total area of the uneven substrate 433. The effective total area is the total projected area of a region (effective surface) where the uneven shape of the uneven surface 434 is formed substantially uniformly. dθ represents a minute angle in the vicinity of the absolute inclination angle θ. ds indicates a projected area occupied by a region where the absolute inclination angle of the uneven surface 434 is in the range of θ to θ + dθ within the effective plane. The projected area is not the area of the curved surface along the concavo-convex shape of the concavo-convex surface 434 but the area of the plane projected on the flat surface (reference surface) obtained by averaging the concavo-convex surface 434.

  By doing so, it is possible to impart infrared diffuse reflection characteristics to the uneven substrate 433. Then, the infrared light emitted from the illumination unit 380 built in the digital pen 300 can be caused to cause the concavo-convex base material 433 to make the infrared reflected light enter the image sensor 350 built in the digital pen 300. In addition, said uneven | corrugated shape is an example and you may form uneven | corrugated shape by other conditions.

  The uneven surface 434 of the uneven substrate 433 is provided with a plurality of flat regions 435 in a pattern according to the rule of the dot pattern. The flat region 435 is designed such that its surface roughness is smaller than the surface roughness of the uneven surface 434 of the uneven substrate 433. The flat region 435 is formed by patterning a transparent resin material on the surface of the concavo-convex base material 433 by a printing method or the like. Or you may perform a shaping | molding process or a transfer process on a transparent base material using the metal mold | die etc. in which the uneven | corrugated area | region and the flat area | region were formed previously. One dot pattern is formed by a set of dots 411 indicated by a plurality of flat regions 435 in the unit area 213, which will be described in detail later.

  The infrared reflection layer 432 is made of a material that reflects infrared light while transmitting visible light. The infrared reflection layer 432 is formed so as to cover the uneven surface 434 and the entire flat region 434 of the uneven substrate 433. Specifically, the infrared reflective layer 432 is formed by alternately stacking a plurality of optical materials having different refractive indexes by a sputtering film forming method or the like.

  The transparent adhesive layer 431 is an adhesive layer made of a transparent medium that bonds the uneven substrate 433 in which the uneven surface 434 and the flat region 434 are covered with the infrared reflective layer 432 and the touch sensor glass 440. The transparent adhesive layer 431 is formed of a material that transmits both visible light and infrared light. The transparent adhesive layer 431 has a refractive index substantially equal to the refractive index of the material of the concave-convex base material 433 and the flat region 435 group.

  The touch sensor glass 440 is a glass including a sensor that detects contact of a finger by a user's touch operation on the display panel 210 with a known technique. The touch sensor glass 440 is disposed on the back surface of the optical film 400 (the bottom surface in FIG. 3).

  The liquid crystal panel 450 is a device that displays an image based on visible light irradiation using the backlight device 460 as a light source by controlling the orientation of liquid crystal molecules. The liquid crystal panel 450 includes a color filter layer 451 including a black matrix 453, a liquid crystal layer, and the like. The black matrix 453 forms, for example, a lattice structure (pixel structure) that partitions the RGB color filters 452. On the back surface of the liquid crystal panel 450, a backlight device 460 for irradiating the liquid crystal panel 450 with light is disposed. The liquid crystal panel 450 applies a voltage for changing the liquid crystal alignment of the liquid crystal layer based on display control by the display-side microcomputer 240. Accordingly, the liquid crystal panel 450 controls the amount of light transmitted from the backlight device 460 and executes various display operations. The liquid crystal panel 450 is disposed on the back surface of the touch sensor glass 440 (the lower surface in FIG. 3).

FIG. 4 is an enlarged cross-sectional view of the display panel 210 according to the first embodiment. FIG. 4 (A)
A detailed view of the flat region 435 is shown in FIG.

  The flat region 435 is formed in a pattern on the surface of the concavo-convex surface 434 of the concavo-convex substrate 433 by a resin transparent in the visible wavelength range by a photolithography method, a screen printing method, a gravure printing method, an ink jet method, or the like. This transparent resin is usually formed using a liquid material. And after forming, it hardens | cures by heat drying or ultraviolet irradiation. At this time, since it is in a liquid state immediately after it is formed on the concavo-convex base material 433, the surface is leveled and becomes a flat shape.

  Note that the transparent resin used for the flat region 435 may be added with a material that is transparent in the visible region and absorbs infrared rays. Since the display panel 210 has the flat region 435 formed on the surface of the concavo-convex surface 434, reading with the digital pen 300 is possible without adding an infrared absorbing material. Therefore, the effect of improving the contrast can be obtained even by adding an infrared absorbing material in a very small amount.

  As another form of forming the flat region 435, as shown in FIG. 4 (B), a mold in which a concavo-convex region and a plurality of flat region groups are formed in advance is prepared, and the transparent base material is collectively molded or Alternatively, batch transfer processing may be performed using a transparent ultraviolet curable resin or the like on a transparent substrate.

  FIG. 5 is a captured image diagram of the dot pattern according to the first embodiment. The infrared light emitted from the illumination unit 380 of the digital pen 300 enters from the smooth surface side of the transparent uneven base 433 and reaches the infrared reflection layer 432. The light reaching the uneven surface 434 of the uneven substrate 433 in contact with the infrared reflective layer 432 is diffusely reflected by the uneven shape, and a part of the reflected light returns to the image sensor 350 of the digital pen 300. On the other hand, the infrared light that has reached the flat region 435 that forms the dot pattern on the infrared reflection layer 434 is specularly reflected by the flat region 435 and does not return to the image sensor 350 of the digital pen 300. Therefore, the image sensor 350 of the digital pen 300 captures an image darkened in a dot pattern.

  Details of the surface roughness of the flat region 435 will be described. The flatness of the flat region 435 is set to be lower than the surface roughness of the concavo-convex surface 434 which is a diffusive concavo-convex region around the flat region 435. The surface roughness referred to here is defined by Ry, which is generally called the maximum height.

  FIG. 6 is a diagram for explaining the surface roughness Ry. Ry is Rp + Rv obtained by extracting only the reference length L in the direction of the average line from the roughness curve of the concavo-convex surface 434, and measuring the interval between the peak line and the valley bottom line of the extracted part in the height direction of the roughness curve. It is expressed in micrometer as a unit. However, when obtaining Ry, it should be noted that only a reference length is extracted from a portion where there are no irregularly high peaks and low valleys that are regarded as scratches or burrs.

  As described above, on the surface of the concavo-convex surface 434 of the diffusive concavo-convex substrate 433, the flat region 435 in which the region according to the rule of the dot pattern is flattened was formed. In the flat region 435, the light diffusibility is low and specular reflection is performed. And the optical film 400 of the structure by which the whole surface of the uneven | corrugated surface 434 and the flat area | region 435 was coat | covered with the infrared reflective layer 432 of visible light transmission and infrared-light reflectivity was invented. With this configuration, the infrared light emitted from the digital pen 300 is specularly reflected in the flat region 435 according to the rule of the dot pattern, becomes dark without returning to the digital pen 300 side, and in the region of the uneven surface 434 outside the flat region 435. It is diffusely reflected and returns to the digital pen 300 side to brighten. Therefore, a sufficient contrast image can be obtained by the brightness difference between the inner and outer regions of the flat region 435 according to the dot pattern rule.

  Since the display panel 210 has a simple configuration of a transparent base material having a diffusive uneven shape and a flat pattern region and an infrared light reflection layer, the display panel 210 is easy to manufacture and can realize functions at low cost.

[4. Details of dot pattern]
Details of the dot pattern will be described below. FIG. 7 is an enlarged view of the optical film 400 as viewed from the front. In FIG. 7A and FIG. 7B, in order to explain the position of the dot 411 of the dot pattern, on the optical film 400, a virtual line (a line that does not actually exist on the optical film 400) is shown. , A first reference line 414 and a second reference line 415 are described. The first reference line 414 and the second reference line 415 are orthogonal to each other. In FIG. 7, a plurality of first reference lines 414 and a plurality of second reference lines 415 form a lattice.

  Each dot 411 is arranged around the intersection of the first reference line 221 and the second reference line 222. That is, each dot 411 is arranged in the vicinity of each lattice point. FIG. 8 is a diagram showing an arrangement pattern of dots 411. Each dot 411 has an X direction from the intersection of the first reference line 414 and the second reference line 415 when the extending direction of the first reference line 414 is the X direction and the extending direction of the second reference line 415 is the Y direction. It is disposed at a position offset (shifted) to the plus side or the minus side along the direction or the Y direction. Specifically, in the optical film 400, the dot 411 takes any one of the arrangements shown in FIGS. In the arrangement of FIG. 8A, the dot 411 is arranged at a position above the intersection of the first reference line 414 and the second reference line 415. When this arrangement is digitized, it is represented by “1”. In the arrangement of FIG. 8B, the dot 411 is arranged at a position on the right side of the intersection of the first reference line 414 and the second reference line 415. When this arrangement is digitized, it is represented by “2”. In the arrangement of FIG. 8C, the dot 411 is arranged at a position below the intersection of the first reference line 414 and the second reference line 415. When this arrangement is digitized, it is represented by “3”. In the arrangement of FIG. 8D, the dot 411 is arranged at a position on the left side of the intersection of the first reference line 414 and the second reference line 415. When this arrangement is digitized, it is represented by “4”. As described above, each dot 411 is represented by a numerical value from “1” to “4” in the digital pen 300 according to the arrangement pattern.

  Then, as shown in FIG. 7B, one dot pattern is formed by 36 dots 411 included in the unit area 213 with 6 dots × 6 dots as one unit area 213. By arranging each of the 36 dots 411 included in the unit area 213 in any one of “1” to “4” shown in FIG. 8, a huge number (6 dots × 6 dots) having different information from each other is obtained. Can be formed as one unit area (4 to the 36th power).

[5. Display Operation of Display Control System 100]
Subsequently, a display operation of the display control system 100 configured as described above will be described. FIG. 9 is a flowchart showing the flow of the display operation. In the following, a case where the user performs a pen input (entry) on the display device 200 using the digital pen 300 will be described.

  First, the display device 200 and the digital pen 300 constituting the display control system 100 are turned on. As a result, the display-side microcomputer 240 is supplied with power from a power source (not shown) and completes initial operations for executing various operations. Similarly, the pen-side microcomputer 360 is supplied with power from a power supply (not shown), and completes initial operations for executing various operations. The display device 200 and the digital pen 300 establish wireless communication with each other. As a result, communication from the transmission unit 370 of the digital pen 300 to the reception unit 230 of the display device 200 is enabled.

  Subsequently, the pen-side microcomputer 360 of the digital pen 300 starts monitoring the pressure acting on the pen tip portion 320 (S500). This pressure is detected by the pressure sensor 330. When the pressure is detected by the pressure sensor 330 (Yes in S500), the pen-side microcomputer 360 determines that the user is pen-inputting characters or the like to the display panel 210 of the display device 200, and the irradiation unit 380 Infrared light irradiation is started. While the pressure is not detected by the pressure sensor 330 (while No in S500 continues), the pen-side microcomputer 360 repeats step S500.

  Next, the configuration including the objective lens 340 and the image sensor 350 detects a dot pattern formed on the display panel 210 at the pen tip position (S510). Here, the infrared light irradiated from the irradiation unit 380 is diffusely reflected in the display panel 210, and a part of the infrared light returns to the digital pen 300 side.

  Infrared light returning to the digital pen 300 side hardly transmits the dots 411 of the dot pattern. Infrared light that has mainly passed through the region between the dots 411 reaches the objective lens 340. The infrared light is received by the image sensor 350 through the objective lens 212. The objective lens 340 is disposed on the display panel 210 so as to receive reflected light from the position indicated by the pen tip portion 320. As a result, the dot pattern at the indicated position of the pen tip portion 320 on the display surface of the display panel 210 is imaged by the image sensor 350. Thus, the configuration including the objective lens 340 and the image sensor 350 optically reads the dot pattern. An image signal generated by the imaging of the image sensor 350 is transmitted to the pen side microcomputer 360.

  Next, the pen side microcomputer 360 acquires the pattern shape of the dot pattern from the received image signal, and specifies the position of the pen tip on the display panel 210 based on the pattern shape (S520). Specifically, the pen side microcomputer 360 acquires the pattern shape of the dot pattern by performing predetermined image processing on the obtained image signal. Subsequently, the pen-side microcomputer 360 determines which unit area (6 dot × 6 dot unit area) from the arrangement of the dots 411 in the acquired pattern shape, and the position of the unit area from the dot pattern of the unit area. Specify coordinates (position information). The pen-side microcomputer 360 converts the dot pattern into position coordinates by a predetermined calculation corresponding to the dot pattern coding method.

  Then, the pen-side microcomputer 360 transmits the specified position information to the display device 200 via the transmission unit 370 (S530). Thereby, the display apparatus 200 can grasp the pen tip position of the digital pen 300.

  The position information transmitted from the digital pen 300 is received by the receiving unit 230 of the display device 300. The received position information is transmitted from the receiving unit 230 to the display-side microcomputer 240.

  When the display-side microcomputer 240 receives the position information, the display-side microcomputer 240 performs a display operation corresponding to the display surface on the display panel 210. Specifically, the display-side microcomputer 240 controls the display panel 210 so as to change the display content of the position corresponding to the position information in the display area of the display panel 210. In this example, since a character is input, a point is displayed at a position corresponding to the position information in the display area of the display panel 210. When the pen input with the digital pen 300 is continued, the display-side microcomputer 240 continuously acquires the position information. Thereby, following the movement of the pen tip portion 320 of the digital pen 300, dots can be continuously displayed at the position of the pen tip portion 320 on the display area of the display panel 210. That is, characters corresponding to the locus of the pen tip portion 320 of the digital pen 300 can be displayed on the display panel 210.

  In addition, although the above description demonstrated the case where a character was entered on a display surface, the usage of the display control system 100 is not restricted to this. Of course, not only characters (numbers etc.) but also symbols and figures can be entered, but the digital pen 300 can be used like an eraser to erase characters and figures displayed on the display panel 210. You can also. Furthermore, using the digital pen 300 like a mouse, the cursor displayed on the display panel 210 can be moved, or the icon displayed on the display panel 210 can be selected. In other words, a graphical user interface (GUI) can be operated using the digital pen 300.

  As described above, the first embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.

  Accordingly, among the components described in the accompanying drawings and the detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

  Moreover, since the above-mentioned embodiment is for demonstrating the technique in this indication, a various change, substitution, addition, abbreviation, etc. can be performed in a claim or its equivalent range.

  The present invention can be applied to a display panel that forms a display control system together with an optical device that emits invisible light and receives reflected invisible light.

DESCRIPTION OF SYMBOLS 100 Display control system 200 Display apparatus 210 Display panel 230 Reception part 240 Display side microcomputer 250 Display side memory 300 Digital pen 310 Main body case 320 Pen tip part 330 Pressure sensor 340 Objective lens 350 Image sensor 360 Pen side microcomputer 370 Transmission part 380 Illumination Unit 390 Pen side memory 400 Optical film 414 First reference line 415 Second reference line 430 Infrared reflective sheet 431 Transparent adhesive layer 432 Infrared reflective layer 433 Uneven substrate 434 Uneven surface 435 Flat region 440 Touch sensor glass 450 Liquid crystal panel 451 Color filter layer 452 Color filter 453 Black matrix 460 Backlight device

Claims (3)

A display panel that forms a display control system together with an optical device that emits invisible light and receives reflected invisible light,
A diffuse reflection layer having a surface shape for diffusing at least part of the invisible light emitted from the optical device, and reflecting to the optical device;
The surface shape is flattened according to a predetermined rule so that the optical device can identify the position information formed on the surface of the diffuse reflection layer and pointed on the display panel by the optical device. , Display panel.   The display panel according to claim 1, wherein the region where the surface shape is flattened is a region where dots formed according to the predetermined rule are formed in the diffuse reflection layer. The display panel according to claim 1, wherein in the diffuse reflection layer, the planarization is performed by setting the surface roughness lower than the surface roughness of the peripheral region.