JP2013068707A - Display device and image display terminal having the display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device preventing crosstalk in three-dimentional display.SOLUTION: A liquid crystal monitor 28 for configuring a display device includes a display panel 210; and two parallax barriers 710 and 720 formed in two layers. When both eyes of a user of the display device are at ideal positions, both eyes are defined as a left eye 730 and a right eye 740. The parallax barrier 710 for preventing the crosstalk is formed between the display panel 210 and the parallax barrier 720. As one example, if assuming a distance from the display panel 210 to the parallax barrier 710 as b; an interval between the parallax barrier 710 and the parallax barrier 720 as a distance c; the width of the parallax barrier 710 as x, and the width of the parallax barrier 720 as m, an expression X:m=(b+c) is established, and the width x is defined as x=m*b/(b+c).

Description

  The present invention relates to a technique for displaying a three-dimensional image, and more particularly to a technique for displaying a three-dimensional image while reducing crosstalk.

  Conventionally, in the case of an apparatus for displaying a three-dimensional image using a single parallax barrier, crosstalk occurs when the position where the image is viewed is shifted. In order to suppress the crosstalk, for example, a method of increasing the width of the parallax barrier is known. However, in this method, when the formation of the parallax barrier is turned on (three-dimensional image display mode), the overall luminance may decrease more than necessary. Furthermore, a part (subpixel) of the specific color hidden by the parallax barrier is hidden, and the specific color is reduced and visually recognized. Therefore, the display quality of the three-dimensional image is also lowered. For example, the original image changes color in the three-dimensional display mode.

  For example, Japanese Patent Application Laid-Open No. 6-105341 (Patent Document 1) discloses a technique for “realizing stereoscopic vision from any arbitrary direction”. Japanese Patent Application Laid-Open No. 2008-1111905 (Patent Document 2) discloses a “display element that reduces the range of the direction in which image crosstalk occurs and can easily display only correct images” (Patent Document 2). ).

JP-A-6-105341 JP 2008-111905 A

  However, the technique disclosed in Japanese Patent Application Laid-Open No. 2008-111905 is directed to a display element that can display different images in each direction when observed from different directions (paragraph 0001 of Patent Document 2). Therefore, when the same user visually recognizes an image, there is a problem that the technique cannot be applied as it is.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a display device in which occurrence of crosstalk is suppressed.

  Another object is to provide an image display terminal having a display device in which occurrence of crosstalk is suppressed.

  According to an embodiment, a display device capable of displaying an image in three dimensions includes a display unit for displaying an image, a first forming unit for forming a parallax barrier that partially shields the display unit, A second forming means for forming a parallax barrier that partially shields the display means is provided between the display means and the first forming means. The width of the parallax barrier formed by the second forming means is smaller than the width of the parallax barrier formed by the first forming means.

  Preferably, the number of parallax barriers formed by the second forming unit is larger than the number of parallax barriers formed by the first forming unit.

  Preferably, the first forming unit forms at least three parallax barriers in one direction. Among the three parallax barriers, one parallax barrier is formed by the second forming unit between the second parallax barrier between the first parallax barrier and the third parallax barrier and the display unit. ing. Two parallax barriers formed by the second forming unit are formed between the first parallax barrier and the display unit and between the third suggestion barrier and the display unit, respectively.

  According to another embodiment, an image display terminal having any of the display devices described above is provided.

According to a certain situation, the occurrence of crosstalk is suppressed.
The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention taken in conjunction with the accompanying drawings.

3 is a block diagram illustrating a hardware configuration of display device 100. FIG. It is a figure showing the outline of the structure of the liquid crystal monitor 200 which has a conventional structure and can display in three dimensions. It is a figure showing the visual recognition aspect in case the both eyes which visually recognize the liquid crystal monitor 200 shown by FIG. 2 have shifted | deviated to the right side from the ideal position. It is a figure showing the outline of a structure of the liquid crystal monitor 28 with which the display apparatus 100 which concerns on this Embodiment is provided. It is a figure showing the case where the parallax barriers 510 and 520 are formed as a one-layer parallax barrier about the display apparatus in a certain situation. It is a figure showing the outline | summary of a structure of the liquid crystal monitor 28 of the display apparatus 100 which concerns on this Embodiment. It is a figure showing the relationship between the display panel 210 and the two parallax barriers 710 and 720 formed in two layers. It is a figure for demonstrating the difference in the parallax formed according to the presence or absence of the parallax barrier 812 among sub parallax barriers (SPB) 810, 811, 812, 813. It is a figure for demonstrating parallax in the case where the user's right eye of the display apparatus 100 has shifted | deviated to the right side from the standard position, and when the user's left eye has shifted | deviated to the left side from the standard position. It is the figure which expanded and represented a part of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 1, a hardware configuration of display device 100 according to the present embodiment will be described. FIG. 1 is a block diagram illustrating a hardware configuration of display device 100. In one aspect, the display device 100 is, for example, a mobile phone, a smartphone, a laptop PC (Personal Computer), a tablet PC, an electronic book, a PDA (Personal Digital Assistant), a portable game machine, or other terminal device. It is realized as a terminal device capable of three-dimensional display.

  The display device 100 includes a communication device 13, a tuner 12, antennas 14 and 15, a CPU (Central Processing Unit) 10, an audio signal processing circuit 11, a positioning processing unit 25, and a positioning signal receiving front end unit 24. A GPS (Global Positioning System) antenna 23, a camera 17, a speaker 27, a flash memory 18, a RAM (Random Access Memory) 19, a ROM (Read Only Memory) 20, a liquid crystal monitor 28, and a backlight 29 A microphone 26, an LED (Light Emitting Diode) 30, a memory card driving device 21, a data communication I / F (Interface) 31, and a vibrator 32. A memory card 22 can be attached to the memory card drive device 21.

  The antenna 14 receives one-seg broadcasting and other television broadcasting signals. The tuner 12 selects a program in accordance with an instruction from the CPU 10 and transmits a video signal and an audio signal to the CPU 10. In other aspects, the antenna 14 may receive a radio broadcast.

  The signal received by the antenna 15 is subjected to front-end processing by the communication device 13, and the processed signal is sent to the CPU 10. The CPU 10 executes a process for controlling the operation of the display device 100 based on a command given to the display device 100. The CPU 10 executes a predetermined process based on the signal sent from the communication device 13 and sends the processed signal to the audio signal processing circuit 11. The audio signal processing circuit 11 performs predetermined signal processing on the signal, and sends the processed signal to the speaker 27. The speaker 27 outputs sound based on the signal.

  The microphone 26 receives an utterance to the display device 100 and sends a signal corresponding to the uttered voice to the voice signal processing circuit 11. The audio signal processing circuit 11 executes a predetermined process for a call based on the signal, and sends the processed signal to the CPU 10. The CPU 10 converts the signal into data for transmission, and sends the converted data to the communication device 13. The communication device 13 generates a signal for transmission using the data and transmits the signal to the antenna 15.

  The flash memory 18 stores data sent from the CPU 10. In addition, the CPU 10 reads data stored in the flash memory 18 and executes a predetermined process using the data.

  The RAM 19 temporarily holds data generated by the CPU 10 based on an operation performed on the button 16. The ROM 20 stores a program or data for causing the display device 100 to execute a predetermined operation. The CPU 10 reads the program or data from the ROM 20 and controls the operation of the display device 100.

  The memory card drive device 21 reads data stored in the memory card 22 and sends it to the CPU 10. Conversely, the memory card drive device 21 writes the data output by the CPU 10 into the empty area of the memory card 22.

  The audio signal processing circuit 11 executes signal processing for a call as described above. In the example illustrated in FIG. 1, the CPU 10 and the audio signal processing circuit 11 are illustrated as separate configurations, but in other aspects, the CPU 10 and the audio signal processing circuit 11 may be configured as an integral unit. Good.

  The liquid crystal monitor 28 displays an image defined by the data based on the data acquired from the CPU 10. For example, the attributes (still file name, performer, performance time, etc.) of still images, moving images, documents, music files stored in the flash memory 18 are displayed. In one aspect, the liquid crystal monitor 28 can display a two-dimensional image and a three-dimensional image. The display of the three-dimensional image is realized, for example, by forming a parallax barrier, but other methods may be used for the three-dimensional display. In another aspect, the liquid crystal monitor 28 may be a touch panel display. In this case, the mechanism of the touch panel is not particularly limited. The mode of the means for displaying an image is not limited to the liquid crystal monitor 28, and may be a monitor using an organic EL (Electro Luminescence) panel, for example.

  The backlight 29 supplies light to the liquid crystal monitor 28 by emitting light. In one aspect, the backlight 29 can increase or decrease the amount of light based on a control signal from the CPU 10.

  The LED 30 realizes a predetermined light emission operation based on a signal from the CPU 10. For example, when the LED 30 can display a plurality of colors, the LED 30 emits light in a color associated with data included in a signal output from the CPU 10. The mode of light emission (interval, number of light emission colors, blinking pattern, etc.) is not particularly limited.

  The data communication I / F 31 accepts attachment of a data communication cable. The data communication I / F 31 sends a signal output from the CPU 10 to the cable. Alternatively, the data communication I / F 31 sends data received via the cable to the CPU 10.

  The vibrator 32 oscillates at a frequency set in the flash memory 18 based on a command output from the CPU 10.

  The GPS antenna 23 receives a signal transmitted from a GPS satellite and sends the received signal to the positioning signal reception front end unit 24. The positioning signal reception front end unit 24 performs pattern matching based on each signal received from at least three (preferably four or more) GSP satellites, and the code pattern included in each signal and the code held by the display device 100 When the pattern matches, the signal is sent to the positioning processing unit 25.

  The positioning processing unit 25 performs positioning processing using the signal, and calculates the position of the display device 100 that has received the signal. The CPU 10 displays the calculation result on the liquid crystal monitor 28. In one aspect, the liquid crystal monitor 28 may display the position information (for example, latitude, longitude, altitude, etc.) of the display device 100 calculated by the positioning processing unit 25 so as to overlap the map. In another aspect, the liquid crystal monitor 28 may display an image of a place taken by the camera 17 and position information of the place in an overlapping manner.

  In display device 100 according to the present embodiment, in one aspect, camera 17 is arranged on the center line of the display area of liquid crystal monitor 28. The center line corresponds to, for example, a symmetry axis when the display area is line symmetric.

  The CPU 10 detects the positions of both eyes of the user of the display device 100 based on the imaging result by the camera 17. When the CPU 10 detects that the positions of both eyes are in a predetermined position for visually recognizing an image displayed in three dimensions, the first parallax barrier is formed in the liquid crystal monitor 28 as the first forming unit 50. However, the second parallax barrier is not formed as the second forming portion 51. Thereby, the parallax barrier can be selectively configured.

  With reference to FIG. 2, the structure of the liquid crystal monitor according to a certain aspect will be described. FIG. 2 schematically shows the structure of a liquid crystal monitor 200 having a conventional configuration and capable of three-dimensional display. The example shown in FIG. 2 represents a state in which the liquid crystal monitor 200 is visually recognized by both eyes at an ideal position, for example.

  The liquid crystal monitor 200 includes a display panel 210 and parallax barriers 220, 221 and 222. Both eyes of the user of the liquid crystal monitor 200 are shown as a left eye 230 and a right eye 240, for example. At this time, when the parallax barriers 220, 221, and 222 are formed, the left eye 230 can visually recognize the left image dots 250, 252, and 254. On the other hand, since the right eye 240 is blocked by the parallax barriers 220, 221 and 222, the left image dots 250, 252 and 254 cannot be visually recognized. Conversely, the right image dots 251, 253, and 255 are visually recognized by the right eye 240, but are not visually recognized by the left eye 230 because they are blocked by the parallax barriers 220, 221, and 222.

  A case where the positions of both eyes of the user are shifted to the right will be described with reference to FIG. FIG. 3 is a diagram showing a visual recognition mode when both eyes viewing the liquid crystal monitor 200 shown in FIG. 2 are shifted to the right from the ideal position.

  Specifically, in one aspect, the user's eyes are shown as a left eye 231 and a right eye 241. At this time, for example, a part 310 of the left image dot 250 is not visually recognized by the left eye 231 because it is blocked by the parallax barrier 220. On the other hand, since the part 310 is not hindered by the parallax barrier 220 with respect to the right eye 241, an image for left eye display is visually recognized by the right eye 241.

  Similarly, a part 311 of the right image dot 251 is not obstructed by the parallax barrier 220 with respect to the left eye 231. Therefore, the image for the right eye is visually recognized by the left eye 231 and crosstalk occurs. On the other hand, since the part 311 is hindered by the parallax barrier 221 with respect to the right eye 241, a part of the image output for the right eye is not visually recognized by the right eye 241. For this reason, the quality of the image displayed in three dimensions is reduced. Similarly, crosstalk also occurs for some of the image dots 312, 313, 314, and 315.

  With reference to FIG. 4, the structure of the display device according to the present embodiment will be described. FIG. 4 is a diagram showing an outline of the configuration of the liquid crystal monitor 28 provided in the display device 100 according to the present embodiment. The liquid crystal monitor 28 includes a display panel 210, parallax barriers 410, 411, 412, 413, 414, and parallax barriers 420, 421, 422. Here, the parallax barriers 420, 421, and 422 may correspond to the parallax barriers 220, 221, and 222 of the liquid crystal monitor 200 having a conventional configuration capable of displaying a three-dimensional image. On the other hand, the parallax barriers 410, 411, 412, 413, and 414 are added to the display device 100 according to the present embodiment in order to improve the quality of an image displayed in three dimensions.

  In one aspect, when both eyes of the user of the display device 100 are located at the left eye 430 and the right eye 440, images output from the display panel 210 are visually recognized by the left eye 430 and the right eye 440 through the parallax barriers 420, 421, and 422, respectively. The

  In another aspect, when the user's eyes are shifted to the left side from the ideal position as shown in the left eye 431 and the right eye 441, a part of the right image dot 251 in the image displayed by the display panel 210 is Since it is blocked by the parallax barrier 410, it is not visually recognized by the left eye 431. Similarly, a part 453 of the right image dot 253 and a part 455 of the right image dot 255 output for the right eye are blocked from the left eye 431 by the parallax barriers 412 and 414, respectively. Is not visually recognized by the left eye 431.

  On the other hand, the left image dots 250, 252, and 254 displayed for the left eye are not visually recognized by the right eye 441 because the portions 450, 452, and 454 are blocked by the parallax barriers 410, 412, and 414, respectively.

  Further, in another aspect, the same applies to the case where the user's eyes are shifted to the right side from the ideal position and shown as the left eye 432 and the right eye 442.

  FIG. 5 is a diagram illustrating a case where parallax barriers 510 and 520 are formed as a single-layer parallax barrier for a display device according to a certain aspect. When both eyes of the user are shown as the left eye 530 and the right eye 540, the image dots 500 and 502 for the left eye are visible to the left eye 530 but not to the right eye 540 due to the parallax barriers 510 and 520. Similarly, the image dots 501 and 503 for the right eye are visually recognized by the right eye 540 but are not visually recognized by the left eye 530 due to the parallax barriers 510 and 520.

  On the other hand, when the user's eyes are shown as the left eye 531 and the right eye 541, a part of the image dots 501 and 503 for the right eye that are not obstructed by the parallax barriers 510 and 520 can be visually recognized by the left eye 531. As a result, crosstalk LBX occurs. A part of the image dots 500 and 502 for the left eye can be visually recognized by the right eye 541. As a result, crosstalk RBX occurs.

  FIG. 6 is a diagram showing an outline of the configuration of the liquid crystal monitor 28 of the display device 100 according to the present embodiment. The liquid crystal monitor 28 further includes parallax barriers 550, 551, 552, 553, 554, and 555 in addition to the parallax barriers 510 and 520 shown in FIG. The parallax barriers 550, 551, 552, 553, 554, and 555 are configured between the parallax barriers 510 and 520 and the display panel 210.

  According to such a configuration, even when the left eye 530 and the right eye 540 in the standard position (that is, the front of the liquid crystal monitor 28) move to the left eye 531 and the right eye 541, they are visually recognized by the left eye 531 and the right eye 541. Crosstalk can be prevented by the parallax barriers 550, 551, 552, 553, 554, and 555.

  With reference to FIG. 7, the configuration of liquid crystal monitor 28 of display device 100 according to the present embodiment will be further described. FIG. 7 is a diagram illustrating a relationship between the display panel 210 and two parallax barriers 710 and 720 formed in two layers. When both eyes of the user of the display device 100 are in an ideal position, for example, the left eye 730 and the right eye 740 are defined.

  In the relationship shown in FIG. 7, the distance from the display panel 210 to the parallax barrier 710 is b. The distance between the parallax barrier 710 and the parallax barrier 720 is a distance c. Let d be the distance from the user's eyes to the parallax barrier 720. The width of the parallax barrier 710 is x, and the width of the parallax barrier 720 is m. At this time, the following relationship is established.

x: m = b: (b + c)
When this is deformed, the width x is obtained from the following equation.

x = m * b / (b + c) (1)
With reference to FIG. 8, the structure of the display apparatus 100 which concerns on this Embodiment is further demonstrated. FIG. 8 is a diagram for explaining a difference in parallax formed according to the presence or absence of the parallax barrier 812 among the sub parallax barriers (SPB) 810, 811, 812, and 813. The parallax barriers 820, 821, 822, and 823 correspond to parallax barriers formed in the same manner as a conventional display device capable of displaying a three-dimensional image (represented as a main parallax barrier “MPB (Main Parallax Barrier)”).

  The image dot 801 corresponds to a part of the left eye image dot that can be visually recognized by the right eye 842 when the parallax barrier 812 is not provided. Here, the right eye 842 is shifted rightward from the right eye 840 at the standard position. The image dot 802 corresponds to a part of the left eye image dot that can be visually recognized by the left eye 831 when the parallax barrier 812 is not provided. Here, the left eye 831 is shifted to the left from the left eye 830 at the standard position.

  For example, the parallax barrier 812 is disposed between the line 850 and the line 860 that are incident on the left eye 830 and the right eye 840 at ideal positions.

  With reference to FIG. 9 and FIG. 10, the structure of the display apparatus 100 which concerns on this Embodiment is further demonstrated. 9 and 10 are diagrams for explaining parallax when the right eye of the user of the display device 100 is shifted to the right side from the standard position or when the left eye is shifted to the left side from the standard position. .

  The distance al corresponds to the amount of deviation from the left eye 730 at the ideal position, and specifically corresponds to the distance from the left eye 730 to the left eye 731 after movement. The distance ar corresponds to the amount of deviation from the right eye 740 at the ideal position, and specifically corresponds to the distance from the right eye 740 to the right eye 742. The distances b, c, and d are the same as the distances shown in FIG.

  The width er corresponds to the width of the crosstalk (RRX) when the right eye 740 at the ideal position moves rightward by the distance ar and is at the place indicated by the right eye 742. Similarly, the width el corresponds to the width (LLX) of the crosstalk when the left eye 730 at the ideal position moves by the distance al in the left direction and is at the place indicated by the left eye 731.

  At this time, the width x of the parallax barrier 710 necessary for preventing the crosstalk is obtained as follows, for example.

ar: er≈d: (b + c) (2)
al: el≈d: (b + c) (3)
er: xr = (b + c): c (4)
el: xl = (b + c): c (5)
x = xr + xl (6)
When Expressions (2) to (6) are modified, the width x of the parallax barrier 710 for preventing crosstalk is obtained as follows.

xr = er * c / (b + c)
= Ar * (b + c) * c / (d * (b + c))
= Ar * c / d (7)
xl = el * c / (b + c)
= Al * (b + c) * c / (d * (b + c))
= Al * c / d (8)
x = (ar * c + al * c) / d
As described above, the display device 100 according to the embodiment of the present invention has two layers of parallax barriers as parallax barriers for displaying a three-dimensional image. The second-layer parallax barrier formed between the existing parallax barrier and the display area is arranged so as to prevent the image from being visually recognized when the parallax barrier deviates from the standard position of the user of the display device 100. With such a configuration, occurrence of crosstalk is suppressed when both eyes of the user of the display device 100 are shifted to the left and right.

  In the present embodiment, a mode in which the parallax barriers 410, 411, 412, 413, and 414 configured as the second-layer parallax barriers are constantly formed is described. The application of the technical idea is not limited to such an aspect. For example, all or part of the parallax barriers 410, 411, 412, 413, 414 may be selectively formed based on a command from the CPU 10. According to such a configuration, it is possible to prevent the image dots from being obstructed more than necessary.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be applied to a terminal device that can display a three-dimensional image with a parallax barrier.

  11 audio signal processing circuit, 12 tuner, 13 communication device, 14, 15 antenna, 16 button, 17 camera, 18 flash memory, 19 RAM, 20 ROM, 21 memory card driving device, 22 memory card, 24 positioning signal reception front end Unit, 25 positioning processing unit, 26 microphone, 27 speaker, 28 liquid crystal monitor, 29 backlight, 32 vibrator, 100 display device, 210 display panel.

Claims (4)

A display device capable of displaying an image in three dimensions,
Display means for displaying an image;
First forming means for forming a parallax barrier that partially shields the display means;
A second forming means for forming a parallax barrier that partially shields the display means between the display means and the first forming means;
The display device, wherein a width of the parallax barrier formed by the second forming unit is smaller than a width of the parallax barrier formed by the first forming unit.   The display device according to claim 1, wherein the number of parallax barriers formed by the second forming unit is greater than the number of parallax barriers formed by the first forming unit. The first forming means forms at least three parallax barriers in one direction;
Among the three parallax barriers, one parallax barrier by the second forming unit is provided between the second parallax barrier between the first parallax barrier and the third parallax barrier and the display unit. Is formed,
Two parallax barriers are formed by the second forming unit between the first parallax barrier and the display unit, and between the third suggestion barrier and the display unit, respectively. The display device according to claim 1 or 2.   An image display terminal comprising the display device according to claim 1.

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