Portable phone

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a mobile phone using a self-luminous type display panel such as an organic EL panel and a non-light emitting type display panel such as a liquid crystal panel as a display panel.

【0002】

[Conventional technology]

As a display panel used in recent mobile phones, there is a self-luminous type display panel such as an organic EL panel. Organic EL panels are expected to display high-quality images such as self-luminous light emission, high-efficiency light emission, high-speed response, full color, and wide viewing angle. In addition, since it is self-luminous, it does not require a backlight or front light unlike a liquid crystal panel, and can be made thinner than a liquid crystal panel.

【0003】

However, since the image cannot be displayed in the reflection mode like the liquid crystal panel, the image quality is greatly impaired by the influence of the surface reflection of the organic EL panel by the external light (hereinafter referred to as the external light) in the bright surroundings.

【0004】

Hereinafter, a conventional mobile phone using an organic EL panel as a display panel will be described.

【0005】

12 and 13 are explanatory views of a conventional mobile phone using an organic EL panel. In FIG. 12, FIG. 12 (a) is a front view of the mobile phone, and FIG. 12 (b) is a central sectional view of the mobile phone. 50 is a mobile phone, 51 is an organic EL panel, 52 is a push button, 53 is a speaker, 54 is a circuit board, 55 is a flexible sheet for EL, and 56 is a button switch.

【0006】

FIG. 13 shows an exploded perspective view of the organic EL panel 51, where 61 is a transparent substrate, 62 is a cushion material, 63 is a windshield, 64 is an organic EL layer, and 65 is a rear glass.

【0007】

The circuit board 54 is equipped with a group of electronic circuits that perform various signal processing, a button switch 56 that operates as a switch function by a push button 52, and the like. The organic EL panel 51 is mounted on the circuit board 54. Information about the display of the organic EL panel 51 is given from the circuit board 54 via the flexible sheet 55. The transparent substrate 61 of the organic EL panel 51 is attached to the housing of the mobile phone 50. The cushion material 62 is attached to cushion the impact on the windshield 63 and the rear glass 65 when the mobile phone 50 is dropped or a mechanical impact is applied. As the transparent substrate 61, a polymer substrate that does not break or crack even when mechanical pressure is applied from the outside is used.

【0008】

Next, the operation will be described.

【0009】

The light emission of the organic EL panel 51 is generated at the portion of the organic EL layer 64 sandwiched between the windshield 63 and the rear glass 65. The organic EL layer 64 is made of a low molecular weight or high molecular weight organic light emitting material. Transparent electrodes (not shown) are vapor-deposited on the organic EL layer 64 side of the windshield 63 and the rear glass 65 in an orthogonal shape. When a voltage of a predetermined magnitude is applied between the transparent electrodes, the organic EL layer 64 emits light, and the light passes through the windshield 63 and is emitted forward. Each transparent electrode forms a matrix structure, and a scanning signal and an image signal are applied to the corresponding electrodes. At the same time, the organic EL layer 64 at the intersection where the voltage is applied emits light, and the image information is displayed.

【0010】

In this way, the organic EL panel 51 emits light with high efficiency in the organic EL layer 64, so that a high-brightness image can be displayed, and the organic EL layer 64 can respond at high speed, so that it is suitable for displaying a moving image. There is. Further, since the emission of the organic EL layer 64 is completely diffused light, it has a wide viewing angle characteristic.

【0011】

However, when the surrounding environment is bright, when the bright outside light passes through the transparent substrate 61 and hits the surface of the windshield 63, the reflected light becomes brighter than the brightness emitted by the organic EL layer 64, so that the contrast is blurred. The display image becomes unclear. If the organic EL layer 64 emits brighter light than the reflected light of the outside light by the transparent substrate 61 and the windshield 63, the displayed image becomes clearer, but the power consumption increases steadily, so that the battery consumption becomes severe and the mobile phone There was a big problem that the usage time was shortened.

【0012】

The present invention has solved such a problem, and an object of the present invention is to provide a mobile phone capable of displaying high image quality according to the ambient brightness and having low power consumption.

【0013】

[Means for solving problems]

The mobile phone of the present invention is characterized in that it is equipped with at least one self-luminous display panel and one non-luminous display panel.

【0014】

It is preferable that the plurality of display panels are mounted on the same plane.

【0015】

It is preferable that at least one of the plurality of display panels is mounted on different planes.

【0016】

The self-luminous type display panel preferably comprises an organic EL panel.

【0017】

The non-emission type display panel preferably comprises a liquid crystal panel.

【0018】

It is preferable to provide a changeover switch for switching and displaying the display image on the display panel of a different type.

【0019】

It is preferable to include an optical sensor for detecting the brightness of the surrounding environment and a control means for switching the display image to the display panel of a different type when the optical sensor detects a change in light.

【0020】

It is preferable that it can be folded from the central part of the main body.

【0021】

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the mobile phone of the present invention will be described in detail with reference to the drawings.

【0022】

Hereinafter, an embodiment of the mobile phone of the present invention will be described with reference to FIGS. 1 to 3.

【0023】

In FIG. 1, 1 is a mobile phone, 3 is a liquid crystal panel, 4 is a flexible sheet for liquid crystal, and 5 is a flexible sheet for EL. As the organic EL panel 51, the same one as the mobile phone shown in FIG. 13 can be adopted.

【0024】

FIG. 2 shows an exploded perspective view of the liquid crystal panel 3, where 22 is a transparent substrate, 23 is a cushioning material, 24 is a front polarizing plate, 25 is a front glass, 26 is a liquid crystal, 27 is a rear glass, and 28 is a rear. The polarizing plate, 29, is a reflecting plate.

【0025】

FIG. 3 is a basic electric block diagram for explaining the function of FIG.

【0026】

As shown in FIG. 1, the mobile phone of the present invention uses both the organic EL panel 51 and the liquid crystal panel 3 as display panels. The liquid crystal panel 3 displays an image in a reflection mode. Since no backlight is required, the operation of the liquid crystal panel 3 alone requires less power consumption, and the battery consumption is reduced, so that the mobile phone can be used for a long time. The use of the organic EL panel 51 is suitable when the surrounding environment is dark and the emission brightness may be low. In this case, the power consumption may be particularly low, so that the battery consumption is low. In the reflection mode of the liquid crystal panel 3, the image quality is poor and cannot be used when the surrounding environment is dark.

【0027】

Further, in the use of the organic EL panel 51, when the surrounding environment is bright and the outside light becomes strong, it is conceivable to emit high brightness for a short time to perform a clear display in order to minimize battery consumption. .. In this case, since the usage time of the mobile phone is short, the reduction of battery consumption is not a concern. When the surrounding environment is bright like this, the image is usually displayed by the reflection mode of the liquid crystal panel 3, and when the surrounding environment is dark or the surrounding environment is bright but the image is displayed for a short time, the image is displayed by the organic EL panel 51. To do. As a result, a clear image display can be provided, and a mobile phone that can be used for a long time can be realized because the battery consumption is small.

【0028】

Next, an operation mode in which the screen becomes bright in the reflection mode of the liquid crystal panel 3 will be described. The liquid crystal 26 is a TN liquid crystal, and transparent electrodes (not shown) are deposited on the inner surfaces of the windshield 25 and the rear glass 27 at right angles to each other via the liquid crystal 26. The external light entering from the transparent substrate 22 side becomes, for example, P light of one polarized light when it reaches the liquid crystal 26 by passing through the front polarizing plate 21. When no voltage is applied between the transparent electrodes (when there is no display information), the liquid crystal molecules of the liquid crystal 26 are twisted by 90 degrees, so the P light of the polarized light that has passed through the front polarizing plate 24 is the liquid crystal 26. It will be twisted 90 degrees by passing through. Therefore, the polarized light after passing through the liquid crystal 26 becomes S light, and passes through the rear polarizing plate 28 whose polarization plane is orthogonal to the front polarizing plate 24. The polarized light of the S light that has reached the reflector 29 is reflected by the reflector 29 and passes through the rear polarizing plate 28 with the same polarized light. The light that has passed through is twisted 90 degrees again by the liquid crystal 26, and when it reaches the front polarizing plate 24, it is in a state of being polarized into P light. Therefore, the polarized light of the P light passes through the front polarizing plate 24. The light reaches the human eye through the transparent substrate 22. That is, the screen becomes bright.

【0029】

The operation mode in which the liquid crystal panel 3 becomes dark in the reflection mode will be described. The external light entering from the transparent substrate 22 side becomes, for example, polarized light of one P light when it reaches the liquid crystal 26 by passing through the front polarizing plate 24. When a voltage corresponding to the information to be displayed is applied between the transparent electrodes, the liquid crystal 26 eliminates the 90-degree twist only in the portion where the voltage is applied to both ends, and the polarized light P passing through the front polarizing plate 24 is the liquid crystal. You will go straight through 26. Therefore, the polarized light of the P light that has passed through the liquid crystal 26 cannot pass through the rear polarizing plate 28 whose polarization plane is arranged orthogonal to the front polarizing plate 24, and as a result, the reflected light from the reflecting plate 29. However, the screen becomes dark because it does not reach the human eye. In this way, the image is displayed in the reflection mode of the liquid crystal.

【0030】

Here, the liquid crystal in the TN mode has been described, but a ferroelectric liquid crystal, a semi-ferroelectric liquid crystal, or the like may be used.

【0031】

The operation mode for displaying an image on the organic EL panel 51 is the same as the operation mode used for a conventional mobile phone.

【0032】

Next, switching between the image display displayed on the organic EL panel 51 and the liquid crystal panel 3 will be described with reference to FIG. Normally, when the surrounding environment is bright, the image is displayed in the reflection mode of the liquid crystal panel 3. When the surrounding environment becomes dark, the mode shifts to the image display mode on the self-luminous organic EL panel 51. This is because the image quality is overwhelmingly better. Switching of the display panel for displaying image information can be realized by the operator pressing a predetermined push button 52a. Now suppose that the surrounding environment has changed from a bright place to a dark place. That is, the image displayed on the organic EL panel 51 is projected from the liquid crystal panel 3. First, by pressing the pushbutton 52a, a pulse signal is transmitted to the controller 62 on the circuit board 54 through the corresponding button switch 56a. By the signal, the controller 62 blocks the image information that has been sent to the liquid crystal panel 3 through the liquid crystal flexible sheet 4 and sends it to the EL flexible sheet 5. That is, a predetermined synchronization signal and image signal for displaying an image on the organic EL panel 51 are transmitted to the flexible sheet 5 for EL. By receiving this signal, the organic EL panel 51 displays normal image information. On the other hand, when the surrounding environment changes from a dark state to a bright state, the display panel on which the image should be displayed can be switched by pressing the push button 52a in the same manner. That is, when the push button 52a is pressed, a pulse signal is applied to the controller 62 on the circuit board 54 through the corresponding button switch 56a as before. The controller 62 determines that this pulse signal is a switching signal, blocks the image information that has been sent to the organic EL panel 51 through the flexible sheet 5 for EL, and sends the information to the flexible sheet 4 for liquid crystal. As a result, the image information is displayed on the liquid crystal panel 3. In this way, the display panel can be selected by pressing the push button 52a depending on the ambient brightness. As shown in Figure 1, two display panels,

【0033】

4 and 5 are diagrams showing other embodiments of the present invention. In this embodiment, the screens of the liquid crystal panel 3 and the organic EL panel 51 are automatically switched by using an optical sensor. FIG. 4 shows an example in which the optical sensor 11 is attached to the surface of the mobile phone 1. FIG. 5 is a basic electrical block diagram for explaining the function of FIG. Now, assuming that the surrounding environment has changed from a bright place to a dark place, the optical sensor 11 outputs the same instruction generated by pressing the push button 52a. That is, when the ambient brightness changes from a bright state to a dark state, the signal S from the optical sensor 11₁(= 1) is output to the controller 62. The controller 62 blocks the image information that has been sent to the liquid crystal panel 3 through the liquid crystal flexible sheet 4 by the signal, and sends the image information to the EL flexible sheet 5. Since a predetermined synchronization signal and image signal for displaying an image on the organic EL panel 51 are transmitted to the flexible sheet 5 for EL, the organic EL panel 51 can display normal image information. Become. On the other hand, when the surrounding environment changes from a dark state to a bright state, the signal S from the optical sensor 11₀(= 0) is output to the controller 62. The controller 62 determines that this pulse signal is a switching signal, blocks the image information that has been sent to the organic EL panel 51 through the flexible sheet 5 for EL, and sends the information to the flexible sheet 4 for liquid crystal. As a result, the image information is displayed on the liquid crystal panel 3. In this way, by using the optical sensor 11, the display panel can be automatically switched according to the ambient brightness.

【0034】

Further, according to the present invention, a clear moving image can be displayed. Since the organic EL can respond much faster than the liquid crystal, the organic EL panel 51 is clearer than the liquid crystal panel 3 when it comes to moving images. However, if the surroundings are bright, the contrast will decrease and it will be difficult to see. That is, the quality of the display image quality becomes a problem of the balance between the responsiveness of the liquid crystal and the low contrast due to the bright surroundings of the organic EL. In such a case, in the present invention, the display panel can be switched by using the function of the push button 52a which can switch the display panel according to the ambient brightness. Therefore, the display panel having the better display quality should be selected. Is possible.

【0035】

FIG. 6 is a diagram showing another embodiment of the present invention.

【0036】

The description so far has been about an example of displaying information on one of the display panels according to the ambient brightness, but in the present invention, it is also possible to display an image on both display panels at the same time. The simultaneous display will be described with reference to FIGS. 4 and 6. FIG. 6 is a basic electric block diagram for explaining the function of FIG. By pressing the push button 52b, the information displayed on one side can be displayed on the other display panel at the same time. That is, by pressing the pushbutton 52b, a signal S indicating both indications to the controller 62 on the circuit board 54 through the corresponding button switch 56b.₂Is transmitted. In response to the signal, the controller 62 simultaneously sends the image information that has been sent to the liquid crystal panel 3 through the liquid crystal flexible sheet 4 to the EL flexible sheet 5 at the same time. As a result, a predetermined synchronization signal and image signal for displaying an image on the flexible sheet 5 for EL are transmitted, and the same image as the liquid crystal panel 3 can be projected on the organic EL panel 51. As a result, even if the screen content changes frequently from a still image to a moving image or from a moving image to a still image, a screen with good image quality can be displayed without changing the display panel each time if simultaneous display is possible as in the present invention. Can be provided.

【0037】

FIG. 7 is a diagram showing still another embodiment of the present invention, and is a basic electric block diagram for explaining the function of FIG. 8, FIG. 9 (a), and FIG. 9 (b) are diagrams for explaining FIG. 7. It is desirable that the organic EL panel 51 and the liquid crystal panel 3 have the same display performance such as screen size, resolution, and number of display pixels, but even if they are not necessarily the same, display without deterioration of image quality is possible. For example, when the screen sizes are different as shown in FIG. 8, if the number of horizontal and vertical display pixels is the same, the display screens are projected in a similar shape, and the display can be performed without any omission of image information.

【0038】

Further, as shown in FIGS. 9A and 9B, even when the number of display lines on one display panel is less than the number of display lines on the other display panel, it is possible to display without missing information. This case will be described with reference to FIG. First, by pressing the pushbutton 52c, a pulse signal is transmitted to the controller 62 on the circuit board 54 through the corresponding button switch 56c. The controller 62 gives a synchronization signal and an image signal so that the display image on the display panel side, which has a small number of display lines displayed, scrolls to the upper part of the screen by the signal. As a result, on the display panel side where the number of vertical lines is insufficient as shown in FIGS. 9 (a) and 9 (b), the scroll image is displayed so as to sequentially protrude upward (in the direction of arrow A). To stop the scrolling function, press the pushbutton 52c again to apply the same pulse signal to the controller 62 on the circuit board 54 through the corresponding button switch 56c. The controller 62 determines this pulse signal as a stop signal, and gives a signal to the display panel side so as to stop the scroll display.

【0039】

Further, even if one has the characteristics of full-color display and the other has the characteristics of mono-color display, it is possible to display without missing information. That is, it can be realized by transmitting the information obtained by adding the red, green, and blue information for full-color display to the display panel of the mono-color display as the shading information by the controller 62.

【0040】

10 and 11 are diagrams showing other embodiments of the present invention. 10 and 11 show an example in which one of the display panels is attached to a different surface of the main body. In FIG. 10, 57 is a push button, 58 is a bent portion, 59 is a connecting line, 60 is a first circuit board, and 61 is a second circuit board. The relationship between FIGS. 10 and 11 is such that the mobile phone 1 is opened and the organic EL panel 51 can be seen in FIG. FIG. 11 shows the mobile phone 1 in FIG. 10 folded in half using the bent portion 58. FIG. 11 (a) is a front view seen from the liquid crystal panel 3 side, and FIG. 11 (b) is a sectional view. The connection line 59 is a line that electrically connects the first circuit board 60 and the second circuit board 61. The push button 57 is a button that controls the display of the liquid crystal panel 3. Whether to display on the organic EL panel 51 or on the liquid crystal panel 3 is determined by the button 52a in the explanation of FIG. 1, but in FIG. 10, the push button 57 has the same function. The first circuit board 60 controls the image information of the liquid crystal panel 3, and the second circuit board 61 controls the image information of the organic EL panel 51. The electrical exchange between the first circuit board and the second circuit board is performed via the connection line 59. The usage of the display panel is the same as that described in Fig. 1, depending on the brightness of the surrounding environment. With such a configuration, the shape becomes compact, and the display panel can be seen even in the folded state, and the operability is excellent.

【0041】

Although the organic EL panel has been described here as the self-luminous type, the effect does not change even if a flat display panel such as a plasma display panel, a field emission panel, or an inorganic EL panel is used.

【0042】

[Effect of the invention]

Since the present invention is configured as described above, the following effects are obtained.

【0043】

The mobile phone according to claim 1 is a mobile phone equipped with a plurality of display panels, and since the display panel is composed of a self-luminous type and a non-light emitting type display panel, the display according to the ambient brightness. Panels can be selected, and mobile phones that can display high-quality images can be provided. Moreover, since the display is performed using a non-light emitting type display panel in a bright place, high image quality display can be performed with low power consumption.

【0044】

Since the mobile phone according to claim 2 has a display panel mounted on the same plane, it is possible to provide a mobile phone that is easy to see with less eye movement when switching display screens.

【0045】

Since the mobile phone according to claim 3 has at least one display panel mounted on different planes, it is possible to provide a mobile phone in which image information can be easily viewed.

【0046】

In the mobile phone according to claim 4, since the self-luminous display panel is composed of an organic EL panel, high-efficiency light emission, high-speed response, full color, and wide viewing angle can be achieved.

【0047】

In the mobile phone according to claim 5, since the non-light emitting type display panel is composed of a liquid crystal panel, it is possible to obtain a high-quality display in a bright place and save power.

【0048】

Since the display panel of the mobile phone according to claim 6 can be easily switched by the changeover switch, it is possible to provide a mobile phone capable of displaying images in a responsive manner.

【0049】

The mobile phone according to claim 7 can switch the display panel according to a change in ambient light by an optical sensor and a control means, so that it is possible to provide a mobile phone capable of displaying an image in a responsive manner. ..

【0050】

Since the mobile phone according to claim 8 can be folded from the central part of the main body, a compact mobile phone can be provided.

[Simple explanation of drawings]

[Figure 1]

It is sectional drawing which shows one Embodiment of the mobile phone of this invention.

[Figure 2]

It is an exploded perspective view of the liquid crystal panel of FIG.

[Fig. 3]

It is a basic electric block diagram for switching the display panel of the mobile phone of FIG.

[Fig. 4]

It is a figure for demonstrating another embodiment of the mobile phone of this invention.

[Fig. 5]

It is an exploded perspective view of the liquid crystal panel of FIG.

[Fig. 6]

It is a figure for demonstrating still another Embodiment of this invention.

[Fig. 7]

It is a figure for demonstrating still another Embodiment of this invention.

[Fig. 8]

It is a figure for demonstrating still another Embodiment of this invention.

[Fig. 9]

It is a figure for demonstrating still another Embodiment of this invention.

[Fig. 10]

It is a figure for demonstrating still another Embodiment of this invention.

[Fig. 11]

It is explanatory drawing which shows the state which the mobile phone of FIG. 10 is folded.

[Fig. 12]

It is explanatory drawing of the conventional mobile phone using the conventional organic EL panel.

[Fig. 13]

It is an exploded perspective view of the organic EL panel of FIG.

[Explanation of symbols]

1 mobile phone, 3 LCD panel, 4 LCD flexible sheet, 5 EL flexible sheet, 52,52a, 52b, 52c, 57 push button, 58 bend, 59 connection line.