JP2010049143A - Display device - Google Patents

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Publication number
JP2010049143A
JP2010049143A JP2008214994A JP2008214994A JP2010049143A JP 2010049143 A JP2010049143 A JP 2010049143A JP 2008214994 A JP2008214994 A JP 2008214994A JP 2008214994 A JP2008214994 A JP 2008214994A JP 2010049143 A JP2010049143 A JP 2010049143A
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Japan
Prior art keywords
display
image
display unit
light
display device
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Pending
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JP2008214994A
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Japanese (ja)
Inventor
Katsuhiko Oba
雄彦 大場
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Panasonic Corp
パナソニック株式会社
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Priority to JP2008214994A priority Critical patent/JP2010049143A/en
Publication of JP2010049143A publication Critical patent/JP2010049143A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device whose display surface comprising a plurality of layers can be viewed simultaneously, and which has excellent responsiveness and low power consumption. <P>SOLUTION: The display device includes: an electronic paper 102 which reflects light on the display surface to display an image; a transparent EL display unit 101 which is arranged on the display surface side of the electronic paper 102, has optical transparency when light is not emitted, and displays the image when light is emitted; and a CPU 311 which allows at least either the electronic paper 102 or the transparent EL display unit 101 to display the image according as a predetermined event occurs. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device including a reflective display unit that performs visible display using reflected light incident on the display surface from the front side of the display surface, and more particularly to a display device including a plurality of display layers.

  As a display device that can be used to display an image or the like in a portable electronic device or the like, there are a liquid crystal display, an organic EL (Organic Electro-Luminescence) display, electronic paper, and the like.

  In particular, when electronic paper is used as a display device, power is not consumed except when the display content is rewritten. For example, it is very useful for portable electronic devices that operate using battery power as a power source, such as mobile phone terminals. Convenient to. However, electronic paper generally has a slow response speed, and it takes time to rewrite display contents. Accordingly, electronic paper is not suitable as a display device for applications such as displaying moving images.

  Therefore, conventionally, a liquid crystal display or an organic EL display has been adopted as a display device used for a mobile phone terminal or the like. However, since liquid crystal displays and organic EL displays always consume power when they are displayed, even when displaying an image that does not change like a still image, if it is displayed continuously for a long time, , Battery consumption becomes violent. Also, the display disappears when the power is turned off.

  Thus, for example, Patent Document 1 discloses a technique for continuing display when the power is turned off. Specifically, it has been proposed that a liquid crystal panel and electronic paper are stacked on the same electrode substrate and a predetermined screen is displayed on the electronic paper when the power is turned off.

JP 2006-139145 A

  If the technology disclosed in Patent Document 1 is adopted, two display devices, a liquid crystal panel and electronic paper, are stacked, so that they can be used properly, and even when the power is turned off, the display is made with electronic paper. Can continue.

  However, in the technique disclosed in Patent Document 1, a liquid crystal panel and electronic paper are laminated on the same electrode substrate, and these are controlled simultaneously, so that the liquid crystal panel and electronic paper are separately provided. Cannot be displayed at the same time.

  In addition, since neither the liquid crystal panel nor the electronic paper emits light, the display of the electronic paper becomes difficult to see when the display device is used in a relatively dark place. Therefore, the display contents may be difficult to see unless separate illumination is prepared for displaying electronic paper or a liquid crystal panel.

  It is an object of the present invention to provide a display device that can simultaneously display a plurality of layers of display surfaces and has high responsiveness and low power consumption.

  The display device of the present invention is disposed on the display surface side of the reflective display unit that reflects light on the display surface and displays an image, and has light transmittance when not emitting light, and when emitting light. A light transmissive light emitting display unit that displays an image, and a display control unit that displays an image on at least one of the reflective display unit and the light transmissive light emitting display unit in response to occurrence of a predetermined event.

  According to this display device, it is possible to view a plurality of layers of display surfaces at the same time, and it is possible to reduce the power consumption with good responsiveness. For example, a light-transmitting light-emitting display unit is disposed above the reflective display unit, and the light-transmitting light-emitting display unit transmits light when not emitting light. It is possible to simultaneously view both the content of the image displayed on the display unit and the display content of the reflective display unit that is seen through the light-transmitting light-emitting display unit. In addition, since the display control unit designates a display destination device for displaying information such as an image in the reflective display unit and the light transmissive light emitting display unit based on the occurrence of an event, there are various display devices. It can be displayed in a display form. As the event, for example, an incoming event, an event that occurs in response to a user input operation, an event that occurs periodically by a timer, or the like is assumed.

  The display device of the present invention further includes an image storage unit that stores a still image and a moving image as an image to be displayed on the display unit, and the display control unit displays the still image on the reflective display unit, and the light A moving image is displayed on the transmissive light emitting display unit.

  According to this display device, when a predetermined event occurs, a still image is displayed on the reflective display unit, and a light-transmitting light-emitting display unit displays a moving image. Therefore, the user overlaps the display unit with two layers. In this state, a moving image and a still image can be viewed simultaneously. For this reason, it is possible to change the appearance of a still image using a moving image, to express the sense of depth of display content by two-layer display, and to mix display colors by superimposing upper and lower display colors. .

  Further, the display device of the present invention includes an image storage unit that stores an image, the display control unit extracts a moving image from the image, and a still image other than the extracted moving image is displayed on the reflective display unit. The extracted moving image is displayed on the light transmission type light emitting display unit.

  According to this display device, for example, when a special image in which a still image and a moving image are combined is displayed, such as an image that expresses a motion by switching a plurality of image elements alternately or sequentially. The still image elements can be displayed on the reflective display unit, and the moving image elements can be displayed on the light transmissive light emitting display unit. The reflective display unit has a relatively slow response speed of display, and it is difficult to display moving image elements clearly, but the light-transmitting light-emitting display unit has a higher response speed than the reflective display unit. It is possible to display a clear moving image by rewriting data of moving image elements at high speed.

  In the display device of the present invention, the display control unit displays an image on the reflective display unit and displays an image for illumination on the light transmission type light emitting display unit.

  According to this display device, when a predetermined event occurs, a still image to be displayed is displayed on the reflective display unit, and for example, a part of display cells (for example, a rectangle at the periphery of the screen) are displayed on the light-transmitting light-emitting display unit. The illumination image is displayed so that the light emission state is displayed on the light-transmitting light-emitting display unit, so that the surface of the reflective display unit on the lower side can be illuminated. it can. Therefore, the still image displayed by the reflective display unit can be displayed brightly when an event occurs.

  In addition, the display device of the present invention includes an illuminance sensor that detects ambient illuminance of the display device, and the illuminance detected by the illuminance sensor when the display control unit displays an image on the reflective display unit. Is equal to or less than a predetermined value, an image for illumination is displayed on the light transmissive light emitting display unit.

  According to this display device, when the display device is used in a relatively dark place, the illuminance detected by the illuminance sensor is reduced, and accordingly, the display control unit displays a display cell as a part of the light transmissive light emitting display unit. In order to display an image for illumination such that the light emitting state is in a light emitting state, the light emitted from the light transmissive light emitting display unit illuminates the surface of the reflective display unit positioned below the other light device. A bright display can be performed without using.

  In the display device of the present invention, when the display control unit switches the display unit from one of the reflection type display unit and the light transmission type light emitting display unit to display the image, the reflection type The image is corrected based on a difference between a display characteristic of the display unit and a display characteristic of the light transmissive light emitting display unit.

  According to this display device, display characteristics (hue, saturation, contrast, brightness, etc.) change between when the display target image is displayed on the reflective display unit and when displayed on the light-transmitting light-emitting display unit. Can be suppressed. That is, since the reflective display unit and the light transmissive light emitting display unit have different structures, the display characteristics of the two are also different from each other. If the same image data is displayed as it is, the display contents of the reflective display unit and the light transmission A difference in display characteristics occurs between the display contents of the light emitting display unit and a change in the image that is visible to the user when the image display destination device is switched. Therefore, the display control unit uses the correction value based on the difference between the display characteristic of the reflective display unit and the display characteristic of the light transmissive light emitting display unit to correct the data of the display target image and switch the corrected data. Display on the reflective display unit as the display unit or the light-transmitting light-emitting display unit.

  In the display device of the present invention, when the display control unit displays the first image on the reflective display unit and displays the second image on the light transmissive light emitting display unit, the reflective display unit And a display range in which discontinuity occurs between the first image and the second image, and the first image and the second in the display range. A correction value that equalizes the image is calculated, and at least one of the first image and the second image is corrected based on the correction value.

  According to this display device, it is possible to suppress color unevenness caused by simultaneously viewing the first image and the second image. Hue, saturation, and contrast in each displayed image due to differences in the structure of the reflective display unit and the light-transmitting light-emitting display unit, display positions, display characteristics due to the effect of overlapping of both display units, etc. Although there is a possibility that color unevenness may occur due to the occurrence of discontinuous areas such as luminance, such color unevenness can be prevented by performing the above correction.

  In addition, the display device of the present invention includes a stereoscopic optical member that stereoscopically displays an image displayed by the reflective display unit, and the stereoscopic optical member includes the reflective display unit and the light transmissive light emission. It is arrange | positioned between display parts.

  According to this display device, since the stereoscopic optical member is disposed between the reflection type display unit and the light transmission type light emission display unit, the user can change the reflection type display unit from above the light transmission type light emission display unit. When viewing the displayed image, parallax occurs between the image seen by the right eye and the image seen by the left eye due to the influence of light refraction at the boundary surface of the stereoscopic optical member. Therefore, the image displayed on the reflective display unit can be shown to the user in three dimensions.

  In the display device of the present invention, the light-transmitting light-emitting display unit has an uneven shape on a surface opposite to the display surface, and the opposite surface of the light-transmitting light-emitting display unit and the reflective display unit A light transmissive layer filled with a light transmissive material different from the light transmissive material constituting the light transmissive light emitting display portion is provided.

  According to this display device, for example, a plurality of kamaboko-shaped uneven shapes are formed side by side on the back surface (non-display surface) of the light-transmitting light-emitting display unit, and the light-transmitting light-emitting display unit has the uneven shape. Since the light transmitting material different from the light transmissive material constituting the light transmissive light emitting display portion is filled between the back side surface and the reflective display portion, the user can use the light transmissive light emitting display portion. When an image displayed on the reflective display unit is viewed from above, parallax occurs between the image seen on the right eye and the image seen on the left eye due to the influence of light refraction at the uneven boundary surface. Therefore, the image displayed on the reflective display unit can be shown to the user in three dimensions.

  In addition, the display device of the present invention includes a stereoscopic optical member that stereoscopically displays an image displayed by the reflective display unit, and the stereoscopic optical member is on the display surface side of the light transmissive light emitting display unit. Is arranged.

  According to this display device, since the stereoscopic optical member is disposed, for example, on the front side surface of the light transmissive light emitting display portion, the user can view the light transmissive light emitting display portion from above the light transmissive light emitting display portion. When viewing the image displayed on the reflective display unit, parallax occurs between the image seen on the right eye and the image seen on the left eye due to the influence of light refraction at the boundary surface of the stereoscopic optical member. Therefore, the image displayed on the reflection type display unit and the light transmission type light emitting display unit can be shown to the user in three dimensions.

  In the display device of the present invention, when the display control unit switches the display unit from one of the reflective display unit and the light transmission type light emitting display unit to display the image, the stereoscopic display is displayed. A focal length determined based on the protruding shape of the optical member for viewing, a distance from the stereoscopic viewing optical member to the display surface of the light transmission type light emitting display, and a display of the reflective viewing display from the stereoscopic viewing optical member The image is corrected according to the distance to the surface.

  According to this display device, both the image displayed on the light transmission type light emitting display unit and the image displayed on the reflection type display unit can be clearly displayed as a stereoscopic image. That is, the protruding shape of the stereoscopic optical member has a predetermined focal point, and the distance from the stereoscopic optical member to the light-transmitting light-emitting display unit and the distance from the stereoscopic optical member to the reflective display unit Therefore, if the same image is displayed on the light transmission type light emitting display unit and the reflection type display unit, one of the images may be displayed in a blurred state due to the influence of defocusing. There is. Therefore, the display control unit switches the display destination device (light transmission type light emitting display unit, reflection type display unit) from the focal length and the stereoscopic optical member to the display surface of the light transmission type light emitting display unit. A desired image display can be performed by correcting the data of the display target image according to the distance and the distance from the stereoscopic optical member to the display surface of the reflective display unit.

  In the display device of the present invention, the reflective display unit is electronic paper.

  According to this display device, it is possible to view a plurality of layers of display surfaces at the same time, and furthermore, since no illumination is required even during display in a relatively bright place, power consumption can be reduced.

  In the display device of the present invention, the light transmission type light emitting display unit is a transparent EL display.

  According to this display device, it is possible to view a plurality of layers of display surfaces at the same time, and furthermore, it is possible to display with excellent response performance.

  In the display device of the present invention, the stereoscopic optical member is a lenticular lens.

  According to this display device, at least the image of the reflective display unit can be displayed in a three-dimensional manner.

  Moreover, the portable terminal device of the present invention includes any one of the above display devices.

  According to this portable terminal device, it is possible to switch the display mode for displaying moving images and still images between a plurality of display units based on an incoming event or the like, and it is possible to reduce the power consumption with good responsiveness. it can.

  According to the present invention, it is possible to provide a display device capable of simultaneously viewing a plurality of layers of display surfaces and having high responsiveness and low power consumption. In other words, by designating the light-transmitting light-emitting display unit as the image display destination, it is possible to clearly display even a fast moving image because of its good response, and the reflection display unit is specified as the image display destination. Therefore, power consumption can be suppressed.

  A display device and a mobile terminal device according to an embodiment of the present invention will be described below with reference to the drawings.

  A display device according to an embodiment of the present invention includes a main display unit that displays a main operation screen, a TV viewing screen, a mail screen, and the like, and a sub display unit that displays a standby screen, an incoming call display, and the like. The display device in this embodiment is a mobile terminal device such as a mobile phone, and the sub display unit is attached to the outside of the casing of the mobile terminal device.

  FIG. 1 is an exploded perspective view illustrating an example of a configuration of a sub display unit in the embodiment of the present invention. In the display device according to the embodiment of the present invention, for example, a sub display unit 10A having a structure as shown in FIG. 1 is used as one display means. In the display device according to the embodiment of the present invention, it is assumed that the sub display units 10B, 10C, and 10D having the structure shown in FIG. 2 are used instead of the sub display unit 10A. The sub display units 10B, 10C, and 10D are modifications of the sub display unit 10A. FIG. 2 is a cross-sectional view in the thickness direction showing the configuration of the sub display portions 10A, 10B, 10C, and 10D in the embodiment of the present invention.

  As shown in FIGS. 1 and 2, the sub display unit 10 </ b> A includes a transparent EL display 101 and electronic paper 102, and the transparent EL display 101 is stacked above the electronic paper 102 (display surface side). Configured.

  The transparent EL display 101 is an example of a light-transmitting light-emitting display unit that has light transmittance when not emitting light and displays an image when light is emitted, and a known technique can be used. For example, the transparent EL display 101 includes a light emitting layer, an insulating layer, a transparent electrode, and a glass substrate, and the light emitting layer emits light in accordance with a voltage applied to the transparent electrode and can perform display. Moreover, since the light emitting layer has light emitting layers of, for example, R (red), G (green), and B (blue) colors, visible information such as images can be displayed. Since the response speed of the display is very fast, it can be used for displaying moving images and can display color images.

  The electronic paper 102 is an example of a reflective display unit that reflects light on a display surface and displays an image, and a known technique can be used. The electronic paper 102 can maintain display even when the power is turned off. The electronic paper 102 has, for example, R (red), G (green), and B (blue) liquid crystal layers sealed with cholesteric liquid crystal capable of storing display states, and electrodes and transparent films above and below each liquid crystal layer. Are arranged respectively. By applying a voltage to each liquid crystal layer through the electrodes, the alignment state of the liquid crystals can be changed and the display contents can be updated. In addition, a light absorption layer is disposed on the back surface of the electronic paper 102 (the back surface of the display surface).

  When displaying using the sub-display unit 10A, not only can the images be displayed on both the transparent EL display 101 and the electronic paper 102, but also the images displayed on both can be displayed in an overlapping manner. . That is, with respect to the transparent EL display 101, the display contents of the electronic paper 102 arranged on the lower side are transmitted as they are except for the portion that emits light by display, so the transparent EL display 101 and the electronic paper are transmitted from the user. 102, the display contents of both can be seen. That is, the user can also view the display content of the transparent EL display 101 and the display content of the electronic paper 102 in an overlapping manner.

  Next, with respect to the sub display unit 10B, which is a modification of the sub display unit 10A, as shown in FIG. 2, a lenticular lens 103 is disposed between the transparent EL display 101 and the electronic paper 102 to form a three-layer structure. It is configured.

  The lenticular lens 103 is made of a light-transmitting material (for example, a transparent resin), and is formed in a shape in which a cylinder is divided in half, that is, a kamaboko shape, and extends in a direction perpendicular to the paper surface of FIG. A plurality of the protruding portions 103a are arranged in the horizontal direction in FIG. The desktop of the lenticular lens 103 is not particularly limited to the kamaboko shape, and may be anything that enables at least the following three-dimensional display. For example, it may have a triangular prism shape extending in the depth direction of FIG. 2 and a shape in which many are arranged in the horizontal direction of FIG.

  When the user views the display content of the electronic paper 102 from above the lenticular lens 103, a parallax occurs between the image seen on the right eye and the image seen on the left eye. Refer to FIG. 3 for the optical path of light passing through the lenticular lens 103. FIG. 3 is a schematic diagram illustrating an example of an optical path in each of the sub display units 10A, 10B, and 10C. That is, when light is refracted at the boundary surface of the peripheral surface of each of the semi-cylindrical protrusions 103a, it is affected by this shape, so that it is positioned between the light path of the image shown in the right eye and the path of the image shown in the left eye. Deviation occurs. That is, even when the user views the same part on the electronic paper 102 with his left and right eyes, the position between the position on the electronic paper 102 of the image seen on the right eye and the position on the electronic paper 102 of the image seen on the left eye There will be a difference. Therefore, by displaying independent contents on the electronic paper 102 based on the position of the image shown on the right eye of the user and the position of the image shown on the left eye, it is possible to show independent images on the right eye and the left eye of the user. As a result, the display content can be displayed three-dimensionally.

  That is, when the sub display unit 10B is used, since the lenticular lens 103 is disposed above the electronic paper 102, a display form in which an image displayed on the electronic paper 102 can be viewed stereoscopically by the user is possible. .

  Next, as for the sub display unit 10C, the transparent EL display 101B is arranged above the electronic paper 102 in the same manner as the sub display unit 10A. In addition, the transparent EL display 101B is formed by arranging a large number of concave recesses 101Ba on the lower surface, and the light formed between the recess 101Ba of the transparent EL display 101B and the surface of the electronic paper 102. The space as the transmission layer is filled with a transparent material as the sealing material 104 and sealed. Further, a light-transmitting material different from that of the transparent EL display 101B is used as the light-transmitting material of the sealing material 104 so that light is refracted on the surface (boundary surface) of the recess 101Ba. Accordingly, in the sub display unit 10C, the concave portion 101Ba of the transparent EL display 101B having the same shape as the lenticular lens 103 functions in the same manner as the lenticular lens 103, and similarly to the case of the sub display unit 10B, A parallax occurs for a user who views the display on the electronic paper 102. Accordingly, even when the sub display unit 10C is used, the display on the electronic paper 102 can be three-dimensionally displayed. Note that, like the sub display portion 10B, the semi-cylindrical convex portion is an example, and may be a triangular prism shape.

  Next, with respect to the sub display unit 10D, the transparent EL display device 101 is disposed above the electronic paper 102 in the same manner as the sub display unit 10A, and the lenticular lens 103 is further disposed above the transparent EL display device 101. It is arranged and has a three-layer structure. Accordingly, in the case of the sub display unit 10D, due to the influence of light refraction at the lenticular lens 103, parallax occurs not only for the display on the electronic paper 102 but also for the display on the transparent EL display 101. When the sub display unit 10D is used, the display device performs a special image processing as shown in FIG. 13 to be described later, so that a desired three-dimensional display is displayed on both the transparent EL display device 101 and the electronic paper 102. Is possible.

  An example of the configuration of a display device provided with the above-described sub display unit 10A is shown in FIG. FIG. 4 is a block diagram showing a configuration example of an electric circuit of the display device including the sub display unit 10A shown in FIG. Further, this display device may be configured by using any one of the above-described sub display units 10B, 10C, and 10D instead of the sub display unit 10A.

  The display device shown in FIG. 4 includes a liquid crystal display panel 303 (hereinafter also referred to as a main display unit 303) used as a main display unit and the above-described sub display unit 10A.

  For example, in the case of a mobile phone terminal having a foldable casing, the main display unit 303 is disposed on the upper surface of the casing that is exposed when the casing is open, and the casing is closed when the casing is closed. It is assumed that the sub-display unit 10A is arranged on the surface appearing at. Thereby, the user can see the display content of the sub display unit 10A when the case is closed, and can see the display content of the liquid crystal display panel 303 when the case is open.

  The display device shown in FIG. 4 includes a display control controller 304 and a display control controller 305 for controlling the display of the sub display unit 10A, and further a display control controller 306 for controlling the display of the liquid crystal display panel 303. Is equipped.

  The display control controller 304 includes a row driver and a column driver for controlling the transparent EL display 101, and the display control controller 305 includes a source driver and a gate driver for controlling the electronic paper 102. The display controller 306 includes a source driver and a gate driver for controlling the liquid crystal display panel 303. Note that the display controller 305 and the display controller 306 can be integrated.

  Regarding the elements other than the display elements, as shown in FIG. 4, a program holding memory (ROM) 307, a memory (RAM) 308, a wireless unit 309, a microprocessor (CPU) 311, an operation unit 312, a camera unit 313, and an illuminance sensor 314 Is equipped.

  The microprocessor 311 controls the overall operation of the display device, and in particular performs display processing. In the display process, control is performed so that an image is displayed on at least one of the electronic paper 102 and the transparent EL display 101 in response to the occurrence of a predetermined event. The program holding memory 307 holds in advance a program prepared in advance to be executed by the microprocessor 311, data necessary for executing the program, and the like. The memory 308 is used for temporarily storing data, images, and the like generated by the microprocessor 311. This image includes still images and moving images.

  The wireless unit 309 has a function of performing wireless communication with a mobile phone base station and the like, and transmits and receives data such as images to and from any other station connected to a predetermined public line. Used for. The operation unit 312 includes a large number of buttons, switches, and the like, and is used to receive user input operations and give instructions to the microprocessor 311. The camera unit 313 has a function of capturing an image of an arbitrary subject according to a user instruction and outputting image data such as a still image or a moving image obtained. The illuminance sensor 314 is provided to detect the illuminance of external light in the vicinity of the sub display unit 10 </ b> A and the main display unit 303.

  The display control controllers 304, 305, and 306 are each connected to the microprocessor 311 via the bus 310. Accordingly, the microprocessor 311 can control the display of the transparent EL display 101 and the electronic paper 102 of the sub display unit 10A and the main display unit 303 via the display control controllers 304, 305, and 306. The bus 310 includes an address bus, a data bus, and a plurality of control signal lines. 4 is supplied with a power supply voltage generated by the output of a battery mounted on the display device.

  Next, display processing in the display device shown in FIG. 4 will be described with reference to FIGS. 5 to 7 are flowcharts showing the contents of the display update processing (A, B, C) for the basic display operation in the display device shown in FIG. This display processing is realized by the control of the microprocessor 311 shown in FIG.

  The content of the basic display update process regarding the display operation of the sub display unit 10A of the display device shown in FIG. 4 is shown in FIG. “Display update processing A” shown in FIG. 5, that is, steps S401 to S407, is processing for updating a still image (photograph or the like) displayed on the electronic paper 102 of the sub display unit 10A as a custom jacket.

  In step S401, the microprocessor 311 monitors the state of the operation unit 312 and identifies whether a predetermined key (custom jacket image update key) has been operated by the user. When the operation of this key is detected, the process proceeds to step S402.

  In step S402, the microprocessor 311 monitors an input operation on the operation unit 312 and selects a new image according to the user's input operation in order to specify an image to be selected after switching (after update).

  In step S403, the microprocessor 311 writes the image data selected in step S402 in a predetermined position on the memory 308 as an image to be displayed on the electronic paper 102.

  In step S <b> 404, the microprocessor 311 starts control of the display controller 305 in order to update the display content of the electronic paper 102.

  In step S405, the microprocessor 311 writes the new image data stored in the memory 308 in step S403 to each display cell of the electronic paper 102 via the display controller 305. For example, the alignment state of each display cell is selected in order, a voltage is applied between the electrodes of the selected display cell, the alignment state of the cholesteric liquid crystal is changed according to the contents of the image data, and the display is switched.

  In step S <b> 406, the updated image is displayed on the electronic paper 102 as a result of completion of writing to all the display cells on the electronic paper 102.

  In step S407, since there is no need to supply power to the electronic paper 102 other than when the display content is rewritten, the updated image is displayed on the electronic paper 102 in step S406. Turn off the power.

  Next, “display update process B” shown in FIG. 6, that is, steps S408 to S414, is a process for displaying a moving image or the like on the transparent EL display device 101 in accordance with the occurrence of a predetermined event.

  In step S408, the microprocessor 311 identifies whether a predetermined event has occurred. For example, the state of the wireless unit 309 is monitored, and whether the wireless unit 309 has received an incoming call from another station is identified as the occurrence of an event. If an event occurrence is detected, the process proceeds to step S409.

  In step S409, the microprocessor 311 specifies data such as a specific moving image previously associated with the event that has occurred.

  In step S410, the microprocessor 311 writes the data such as the moving image specified in step S409 at a predetermined position on the memory 308 as an image to be displayed on the transparent EL display 101.

  In step S411, the microprocessor 311 starts control of the display controller 304 in order to update the display content of the transparent EL display device 101.

  In step S412, the microprocessor 311 writes the new image data stored in the memory 308 in step S410 into each display cell of the transparent EL display device 101 via the display controller 304. For example, the display contents are switched by selecting each display cell in order and adjusting the light emission on / off, the light emission amount, and the light emission color of the display cell selected according to the content of the image data.

  In step S <b> 413, the updated image is displayed on the transparent EL display 101 as a result of completion of writing to all the display cells on the transparent EL display 101. The process for updating the display of the transparent EL display 101 is completed in step S414, but the supply of the power supply voltage to the transparent EL display 101 is continued as long as the display is performed.

  Next, “display update process C” shown in FIG. 7, that is, steps S415 to S421, is a process for automatically illuminating the display of the electronic paper 102 when the user uses the display device in a dark place. is there.

  In step S415, the microprocessor 311 uses the illuminance sensor 314 to measure the illuminance in the usage environment of the display device. Then, the detected illuminance is compared with a predetermined threshold value to identify whether it is a dark place. If it is a dark place, the process proceeds to step S416.

  In step S416, the microprocessor 311 identifies image data prepared in advance for lighting the electronic paper 102 in a dark place. As an example of this image data, it is conceivable to use an image in which the shape of a square shape, that is, an area of a rectangular outline portion (area corresponding to the peripheral part of the screen) is displayed brightly.

  In step S417, the microprocessor 311 writes the image data specified in step S416 at a predetermined position on the memory 308 as an image to be displayed on the transparent EL display device 101.

  In step S418, the microprocessor 311 starts control of the display controller 304 in order to update the display content of the transparent EL display device 101.

  In step S419, the microprocessor 311 writes the new image data (data for illumination) stored in the memory 308 in step S417 to each display cell of the transparent EL display device 101 via the display controller 304. For example, the display contents are switched by the same method as the process in the display update process B.

  In step S <b> 420, the updated image is displayed on the transparent EL display 101 as a result of completion of writing to all the display cells on the transparent EL display 101. That is, the image displayed on the transparent EL display 101 emits light, for example, at a portion corresponding to a rectangular outline, and this light illuminates the surface of the electronic paper 102 positioned below. Function as. The process for updating the display on the transparent EL display 101 is completed in step S421, but the supply of the power supply voltage to the transparent EL display 101 is continued for a while. Note that when a predetermined time has elapsed since the start of illumination, the supply of the power supply voltage to the transparent EL display 101 may be stopped in order to turn off the illumination.

  A display example when the processing shown in FIG. 7 is executed is shown in FIG. That is, a still image is displayed on the electronic paper 102. In order to illuminate the display brightly, the peripheral portion 800 of the screen of the transparent EL display 101 is simultaneously emitted in a square shape, and this is illuminated on the electronic paper 102. It is used as. The display content of the electronic paper 102 can be confirmed in parts other than the peripheral part 800.

  As described above, the display device according to the present embodiment executes the “display update process A” illustrated in FIG. 5, so that the still image (photograph or the like) displayed on the electronic paper 102 can be switched according to a user instruction. Further, since “display update processing B” shown in FIG. 6 is executed, a moving image or the like can be automatically displayed on the transparent EL display device 101 when an event such as an incoming call occurs. Further, since the “display update process C” shown in FIG. 7 is executed, when used in a dark place, the illumination display displayed on the transparent EL display 101 is provided without newly providing an external illumination device. Since the lower electronic paper 102 is illuminated by the image, the still image displayed on the electronic paper 102 is clearly visible to the user. Since electronic paper generally has a high display contrast, no illumination is required when used in a bright environment.

  Furthermore, in order to realize display functions in various display forms, the microprocessor 311 executes the display processing shown in FIGS. 8 to 13 as necessary. 8 to 13 are flowcharts showing the contents of display processing for various displays in the display device shown in FIG. Each operation shown in FIGS. 8 to 13 will be described below.

  In step S11 shown in FIG. 8, the microprocessor 311 identifies whether a predetermined event has occurred. Specifically, a still image on the electronic paper 102 is displayed, a moving image on the transparent EL display 101 is displayed at the same time, and a display form is started so that both can be seen by the user in a state where both the displays are overlapped. Therefore, it is identified whether or not an event assigned in advance (for example, detection of an incoming call) has occurred. If occurrence of an event is detected, the process proceeds to step S12.

  In step S12, the microprocessor 311 acquires still image data DA to be displayed on the electronic paper 102. In step S13, the microprocessor 311 acquires moving image data DB to be displayed on the transparent EL display device 101. These image data are stored in the RAM 308, for example.

  In step S14, the microprocessor 311 displays the still image data DA on the electronic paper 102. In step S15, the microprocessor 311 displays the moving image data DB on the transparent EL display device 101. The details of step S14 are the same as steps S403 to S407 in FIG. 5, and the details of step S15 are the same as steps S410 to S414 in FIG.

  By executing the processing shown in FIG. 8, it is possible to display the sub-display unit 10A in the form as shown in FIG. 14, for example. The example shown in FIG. 14 represents an example in which the display form is switched between a standby state and an incoming time in a mobile phone as a display device. That is, in the waiting state 1401 shown on the left side of FIG. 14, the transparent EL display 101 is in a non-display state, and the electronic paper 102 displays a still image representing a “starry sky” landscape. In the incoming state 1402 shown on the right side of FIG. 14, the character string “incoming” is displayed on the transparent EL display 101 while the still image representing the “starry sky” landscape is displayed on the electronic paper 102. The moving images representing the scenery of the meteor's movement trajectory are displayed in a superimposed state at the same time. In this case, since the display of the lower electronic paper 102 can be seen through the transparent EL display 101 at the non-display portion of the transparent EL display 101, the user can see both images superimposed. it can.

  FIG. 15 shows another display example when the processing shown in FIG. 8 is executed. A display form 1501 shown on the left side of FIG. 15 represents a standby state in a mobile phone as a display device, and displays a still image including a “snowman's image and an incoming mail figure” on the electronic paper 102, An image that appears stereoscopically is displayed using the parallax generated by the lenticular lens 103 included in the sub display units 10B to 10D. A display form 1502 shown on the right side of FIG. 15 represents an event occurrence such as an incoming call on a mobile phone as a display device, and a moving image representing snowfall is further superimposed on the still image display shown on the left side. it's shown. The snowfall moving image is displayed on the transparent EL display 101 in consideration of the response speed.

  Further, still another display example when the processing shown in FIG. 8 is executed is shown in FIG. A display form 1601 shown on the left side of FIG. 16 represents a standby state in a mobile phone as a display device, and displays a still image including a “pattern representing a state of waves on the water surface” on the electronic paper 102 and a sub-display. Images that appear stereoscopically are displayed using parallax generated by the lenticular lens 103 included in the units 10B to 10D. Further, a display form 1602 shown on the right side of FIG. 16 represents the occurrence of an event such as an incoming call on a mobile phone as a display device, and a moving image representing fluctuation of the water surface is further displayed on the still image display shown on the left side. Overlaid. The moving image of the water surface fluctuation is displayed on the transparent EL display 101 in consideration of the response speed.

  Next, in step S21 shown in FIG. 9, the microprocessor 311 identifies whether a predetermined event has occurred. Specifically, it is identified whether an event that newly displays some image on the electronic paper 102 or an event that indicates updating the display content of the electronic paper 102 has occurred.

  In step S <b> 22, the microprocessor 311 displays image data to be displayed on the electronic paper 102. The details of this process are the same as steps S403 to S407 shown in FIG.

  In step S23, the microprocessor 311 identifies whether or not the transparent EL display 101 is in a non-display state. If the transparent EL display 101 is in a non-display state, the microprocessor 311 proceeds to the next step S24.

  In step S24, the microprocessor 311 acquires image data for illumination that is prepared in advance. As an example of this image data, it is conceivable to use an image in which the shape of a square shape, that is, an area of a rectangular outline portion (area corresponding to the peripheral part of the screen) is displayed brightly.

  In step S25, the microprocessor 311 displays the illumination image data acquired in step S24 on the transparent EL display 101. The details of this process are the same as steps S417 to S421 shown in FIG.

  That is, since the processing shown in FIG. 9 is executed, when the image is newly displayed on the electronic paper 102 or the image displayed on the electronic paper 102 is rewritten, a part of the transparent EL display 101 is displayed. Since light is emitted to illuminate the surface of the electronic paper 102, the display on the electronic paper 102 can be illuminated at this time regardless of whether or not it is a dark place.

  Next, in step S31 shown in FIG. 10, the microprocessor 311 identifies whether a predetermined event has occurred. Specifically, it is identified whether an event for switching the display destination of the display target image from the transparent EL display 101 to the electronic paper 102 or from the electronic paper 102 to the transparent EL display 101 has occurred. If an event occurs, the process proceeds to step S32.

  In step S32, the microprocessor 311 acquires data regarding display characteristics (hue, saturation, contrast, brightness, etc.) of the display device before switching (electronic paper 102 or transparent EL display 101) from the ROM 307 as display characteristic data D1. .

  Further, in step S33, the microprocessor 311 uses the ROM 307 as display characteristic data D2 as data relating to display characteristics (hue, saturation, contrast, luminance, etc.) of the switching destination display device (transparent EL display device 101 or electronic paper 102). get. These data are stored in advance in the ROM 307 as constants.

  In step S34, the microprocessor 311 generates a correction value based on the difference between the display characteristic data D1 and D2.

  In step S35, the microprocessor 311 corrects the image data (hue, saturation, contrast, brightness, etc.) displayed on the pre-switching display device using the correction values.

  In step S36, the microprocessor 311 ends the display of the display device before switching, and displays the image data corrected in step S35 on the switching destination display device.

  Since the electronic paper 102 and the transparent EL display 101 have different structures and the like, it is inevitable that a difference occurs between the display characteristics of the electronic paper 102 and the display characteristics of the transparent EL display 101. Therefore, for example, when the display destination of an image is switched to the transparent EL display 101 from a state in which an image is displayed on the electronic paper 102, display contents (hue, saturation) that can be seen by the user due to the influence of the difference in display characteristics. , Contrast, brightness, etc.). However, when the processing shown in FIG. 10 is executed, the image data is corrected after using the correction values generated based on the display characteristics of the display device before switching and the display characteristics of the switching destination display device, and then the switching destination. Since an image is displayed on the display device, changes in display contents (hue, saturation, contrast, brightness, etc.) associated with switching of the display destination can be greatly suppressed.

  Next, in step S41 shown in FIG. 11, the microprocessor 311 identifies whether or not a predetermined event has occurred. Specifically, it is identified whether an event for displaying some image on the transparent EL display device 101 or the electronic paper 102 (for example, a user input operation or an incoming call) has occurred. If an event occurs, the process proceeds to step S42.

  In step S <b> 42, the microprocessor 311 identifies whether the display destination of the display target image is the electronic paper 102. If the display destination is the electronic paper 102, the process proceeds to step S43.

  In step S43, the microprocessor 311 analyzes the content of the image data to be displayed and identifies whether or not a moving image is included in the image data. Image data to be displayed is stored in the RAM 308, for example.

  For example, two types of image elements (for example, graphics) can be alternately displayed for display, or three or more image elements can be sequentially switched for display to display a moving image such as an animation. it can. Further, it is also possible to display an image that combines a moving image and a still image that realize such display. However, since the response speed of the electronic paper 102 is slow, it is not suitable for displaying moving images or moving images. Therefore, when it is detected that the moving image as described above is included in the image data to be displayed, the process proceeds from step S43 to S44 in order to perform a special process.

  In step S44, the microprocessor 311 extracts a moving image from the image data to be displayed.

  In step S <b> 45, the microprocessor 311 deletes the moving image from the image data to be displayed and displays only the remaining data on the electronic paper 102.

  In step S46, the microprocessor 311 displays the moving image extracted in step S44 on the transparent EL display 101. Further, the display of the transparent EL display device 101 is periodically updated according to the content of the moving image, for example.

  In other words, by executing the processing shown in FIG. 11, when still image and moving image are included in the image data to be displayed, only the still image is displayed on the electronic paper 102, and the elements of the moving image are Since it is displayed on the transparent EL display device 101 having a fast response speed, even an image including a moving image can be clearly displayed.

  Next, in step S51 shown in FIG. 12, the microprocessor 311 identifies whether or not a predetermined event has occurred. Specifically, in order to display an image on the electronic paper 102 and display an image on the transparent EL display 101 at the same time, and start a display form in which both can be seen by the user in a state where both displays are superimposed. It is identified whether a pre-assigned event (for example, detection of incoming call) has occurred. If occurrence of an event is detected, the process proceeds to step S52.

  In step S52, the microprocessor 311 acquires the first display target image data DA to be displayed on the electronic paper 102, and in step S53, acquires the second display target image data DB to be displayed on the transparent EL display device 101. .

  That is, here, the image displayed on the electronic paper 102 (corresponding to DA) and the image displayed on the transparent EL display device 101 (corresponding to DB) are superimposed and displayed so as to be seen as one composite image from the user side. Assumes that. However, since the structure and the like of the electronic paper 102 and the transparent EL display 101 are different from each other, the display characteristics (hue, saturation, contrast, brightness, etc.) of the electronic paper 102 and the display characteristics of the transparent EL display 101 are not. A difference is inevitable. Therefore, in the composite image obtained by superimposing the image displayed on the electronic paper 102 and the image displayed on the transparent EL display device 101, a region where discontinuity occurs in the image may occur due to the influence of the difference in display characteristics. . For example, it is a case where specific images of the same color (C1) are included in the first display target image data DA and the second display target image data DB as the contents displayed at positions adjacent to each other on the composite image. However, the color of the image actually displayed as a visible image on the electronic paper 102 is slightly different from the color C1 (C2), and the image actually displayed as a visible image on the transparent EL display 101 is displayed. The color is also slightly different from C1 (C3), and there may be a difference between the display color (C2) of the electronic paper 102 and the display color (C3) of the transparent EL display 101. For this reason, a discontinuous region (color C2 and color C3 appear adjacent and discontinuous) is formed at a portion that should appear continuously in the same color (C1) on the composite image. It may be recognized by the user. In order to suppress the occurrence of this color unevenness, the processing after step S54 is executed.

  In step S54, the microprocessor 311 acquires data relating to the display characteristics (hue, saturation, contrast, brightness, etc.) of the electronic paper 102 from the ROM 307 as display characteristic data D1. In step S55, the microprocessor 311 acquires data relating to the display characteristics (hue, saturation, contrast, brightness, etc.) of the transparent EL display device 101 from the ROM 307 as display characteristic data D2. These data are stored in advance in the ROM 307 as constants.

  In step S56, the microprocessor 311 calculates the range of the region where the discontinuity occurs based on the acquired display characteristic data D1 and D2 and the contents of the display target image data (DA and DB). That is, when the display colors on the image data are the same and the images existing at positions adjacent to each other are included in both the image data (DA, DB), the corresponding portion may be discontinuous. It becomes a certain area (discontinuous occurrence area).

  In step S57, the microprocessor 311 sets a correction value for uniformizing the display in the discontinuity occurrence area obtained in step S56 for at least one of the first display target image data DA and the second display target image data DB. Include and correct image data. For example, when the display color on the display target image data (DA, DB) is C1, and the colors appearing on the electronic paper 102 and the transparent EL display 101 are C2 and C3, respectively, In order to make it difficult for the user to see the difference between the display colors C2 and C3, for example, the intermediate color (C4) between the display colors C2 and C3 is the boundary between the discontinuous occurrence regions in the first display target image data DA or the second display target image data DB. It is conceivable to write in the location.

  In step S58, the microprocessor 311 displays the first display target image data DA corrected in step S57 on the electronic paper 102. In step S59, the second display target image data corrected in step S57. DB is displayed on the transparent EL display 101.

  Therefore, when the image displayed on the electronic paper 102 and the image displayed on the transparent EL display device 101 are overlapped and shown to the user as one composite image, the transparent EL display is performed by executing the processing shown in FIG. The occurrence of uneven color based on the difference in display characteristics between the container 101 and the electronic paper 102 can be suppressed.

  Next, the process shown in FIG. 13 is a process suitable for the case where the sub display unit 10D is used instead of the sub display unit 10A among the sub display units 10B, 10C, and 10D that can display stereoscopically. is there. When the sub display unit 10D is used, both the image displayed on the transparent EL display 101 and the image displayed on the electronic paper 102 are affected by the refraction of light by the lenticular lens 103 disposed at the top. A three-dimensional image can be displayed. However, since the display surface of the transparent EL display 101 and the display surface of the electronic paper 102 are slightly displaced in the thickness direction, the distance between these display surfaces and the lenticular lens 103 is also different. Therefore, even when the same image is displayed on the transparent EL display 101 and the electronic paper 102, the display content of the transparent EL display 101 and the display on the electronic paper 102 that are visible to the user are affected by the influence of the focal length of the lenticular lens 103. There is a difference between the displayed contents. Therefore, the process shown in FIG. 13 is executed so that the display contents visible to the user do not change with the change of the image display destination.

  In step S61 shown in FIG. 13, the microprocessor 311 identifies whether a predetermined event has occurred. Specifically, it is identified whether an event for switching the display destination of the display target image from the transparent EL display 101 to the electronic paper 102 or from the electronic paper 102 to the transparent EL display 101 has occurred. If an event occurs, the process proceeds to step S62.

  In step S <b> 62, the microprocessor 311 acquires information regarding the focal length of the lenticular lens 103 from the ROM 307. Information about the focal length is stored in the ROM 307 in advance.

  In step S <b> 63, the microprocessor 311 acquires position information regarding the display surface of the transparent EL display device 101 and the display surface of the electronic paper 102 from the ROM 307. The position information is stored in the ROM 307 in advance.

  In step S64, the microprocessor 311 displays the position of the display surface in the pre-switching display device (electronic paper 102 or transparent EL display 101) and the display surface in the switching destination display device (transparent EL display 101 or electronic paper 102). A correction value is generated based on the position difference and the focal length of the lenticular lens 103.

  In step S65, the microprocessor 311 corrects the display target image data displayed on the pre-switching display device (the electronic paper 102 or the transparent EL display device 101) using the correction value. In other words, the content of the image data is corrected so that the content visible to the user does not change due to the difference in the position of the display surface.

  In step S66, the microprocessor 311 ends the display on the display device before switching (electronic paper 102 or the transparent EL display 101), and the image data corrected in step S65 is displayed on the switching destination display device (transparent EL display 101). Or displayed on the electronic paper 102).

  Note that the display device in the present embodiment may perform the processes in FIGS. 5 to 13 in combination according to the structure of the sub display unit 13, the surrounding environment of the display device, an event, and the like.

  In addition, the display device according to the present embodiment may include only the sub display units 10A to 10D as the display unit without providing the main display unit 303. Furthermore, the structure of the sub display units 10A to 10D may be applied to the main display unit.

  As described above, the display device according to the present invention can display the contents synthesized by superimposing the two screen displays, and can realize various display modes. For example, as a display device for a portable device such as a mobile phone terminal. Convenient to use. In particular, when displaying using electronic paper, power is not consumed except when rewriting the image, so battery consumption is avoided even when a still image used as a jacket is always displayed on the surface of the housing. be able to. Furthermore, a moving image can be clearly displayed by displaying it on a transparent EL display with a high response speed, and the transparent EL display can be used as a light source for illumination.

It is a disassembled perspective view which shows the structure of the sub display part in embodiment of this invention. It is sectional drawing of the thickness direction which shows the structure of each sub display part in embodiment of this invention. It is a schematic diagram which shows the example of the optical path in each sub-display part in embodiment of this invention. It is a block diagram which shows the structural example of the electric circuit of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display update process for the basic display operation | movement of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display update process for the basic display operation | movement of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display update process for the basic display operation | movement of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display process of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display process of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display process of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display process of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display process of the display apparatus in embodiment of this invention. It is a flowchart which shows an example of the display process of the display apparatus in embodiment of this invention. It is an external view which shows the example of a display of the subdisplay part in embodiment of this invention. It is an external view which shows the example of a display of the subdisplay part in embodiment of this invention. It is an external view which shows the example of a display of the subdisplay part in embodiment of this invention. It is an external view which shows the example of a display of the subdisplay part in embodiment of this invention.

Explanation of symbols

10A, 10B, 10C, 10D Sub display section 101, 101B Transparent EL display 102 Electronic paper 103 Lenticular lens 104 Sealing material 303 Liquid crystal display panel (main display section)
304, 305, 306 Display controller 307 Program holding memory (ROM)
308 Memory (RAM)
309 Wireless unit 310 Bus 311 Microprocessor (CPU)
312 Operation unit 313 Camera unit 314 Illuminance sensor

Claims (15)

  1. A reflective display unit that reflects light on the display surface and displays an image;
    A light-transmitting light-emitting display unit that is disposed on the display surface side of the reflective display unit, has light transmittance when not emitting light, and displays an image when emitting light;
    A display device comprising: a display control unit configured to display an image on at least one of the reflective display unit and the light transmissive light emitting display unit in response to occurrence of a predetermined event.
  2. The display device according to claim 1, further comprising:
    An image storage unit for storing still images and moving images as images to be displayed on the display unit;
    The display control unit displays a still image on the reflective display unit, and displays a moving image on the light transmissive light emitting display unit.
  3. The display device according to claim 1, further comprising:
    An image storage unit for storing images;
    The display control unit extracts a moving image from the image, displays a still image other than the extracted moving image on the reflective display unit, and displays the extracted moving image on the light transmissive light emitting display unit. Display device.
  4. The display device according to claim 1,
    The display control unit displays an image on the reflective display unit and displays an image for illumination on the light transmission type light emitting display unit.
  5. The display device according to claim 4, further comprising:
    Provided with an illuminance sensor for detecting the ambient illuminance of the display device,
    When the illuminance detected by the illuminance sensor is equal to or lower than a predetermined value when the display control unit displays an image on the reflective display unit, the display control unit displays an image for illumination on the light transmissive light emitting display unit. .
  6. The display device according to claim 1,
    The display control unit switches the display unit from one of the reflection type display unit and the light transmission type light emitting display unit to the other to display an image, and displays the display characteristics and the light transmission of the reflection type display unit. A display device that corrects the image based on a difference from display characteristics of a light emitting display unit.
  7. The display device according to claim 1,
    The display control unit displays the first image on the reflection type display unit and displays the second image on the light transmission type light emission display unit, and the display characteristics of the reflection type display unit and the light transmission type light emission. Based on the display characteristics of the display unit, a display range in which discontinuity occurs between the first image and the second image, and a correction value that equalizes the first image and the second image in the display range. A display device that calculates and corrects at least one of the first image and the second image based on the correction value.
  8. The display device according to claim 1, further comprising:
    An optical member for stereoscopic viewing that stereoscopically displays an image displayed by the reflective display unit;
    The stereoscopic optical member is disposed between the reflective display unit and the light-transmitting light-emitting display unit.
  9. The display device according to any one of claims 1 to 7,
    The light transmissive light emitting display unit has an uneven shape on the surface opposite to the display surface,
    A light transmissive layer filled with a light transmissive material different from a light transmissive material constituting the light transmissive light emitting display portion between the opposite surface of the light transmissive light emitting display portion and the reflective display portion. A display device comprising:
  10. The display device according to claim 1, further comprising:
    An optical member for stereoscopic viewing that stereoscopically displays an image displayed by the reflective display unit;
    The stereoscopic optical member is disposed on a display surface side of the light transmission type light emitting display unit.
  11. The display device according to claim 10,
    When the display control unit switches the display unit from one of the reflective display unit and the light transmission type light emitting display unit to display the image, the display control unit is based on the protruding shape of the stereoscopic optical member. In accordance with a fixed focal length, a distance from the stereoscopic optical member to the display surface of the light transmissive light emitting display unit, and a distance from the stereoscopic optical member to the display surface of the reflective display unit, A display device for correcting the image.
  12. The display device according to any one of claims 1 to 11,
    The reflective display unit is electronic paper.
  13. The display device according to any one of claims 1 to 11,
    The light transmissive light emitting display unit is a transparent EL display.
  14. The display device according to any one of claims 8 to 11,
    The stereoscopic optical member is a lenticular lens.
  15.   A portable terminal device comprising the display device according to claim 1.
JP2008214994A 2008-08-25 2008-08-25 Display device Pending JP2010049143A (en)

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