JP5793099B2 - Display device, electronic device and control circuit - Google Patents

Description

  The present disclosure relates to a display device, an electronic device, and a control circuit.

  A technique is known in which light is spatially separated using a lenticular lens, and a displayed image is divided into a plurality of viewpoint images and presented to an observer. Such a technique is used in, for example, a stereoscopic display device that presents an image in which parallax is given to the left and right eyes of an observer, a directional display device that displays an image that varies depending on the observation direction, and the like.

  In such a display device, a technique for electronically configuring a lenticular lens using liquid crystal or the like is also known. Such a technique is described in Patent Document 1, for example. By doing in this way, there exists an advantage that the pitch, direction, etc. of a lenticular lens can be adjusted freely, for example.

JP2011-164527A

  In the lenticular lens, a plurality of cylindrical lenses are arranged. A plurality of viewpoint images are observed by these lenses refracting light corresponding to each pixel displaying an image in the left-right direction.

  However, for example, when the viewpoint image is observed from various directions, the focus of the lens is not aligned with the pixel, and the image quality of the observed image may be deteriorated.

  Therefore, the present disclosure proposes a new and improved display device, electronic apparatus, and control circuit that can optimize the focal length of a lens in a lenticular lens type display device.

According to the present disclosure, the lens unit includes a lens having a variable focal length, and spatially separates the light corresponding to the pixels arranged on the display surface by the lens, and the information indicating the position of the observer A lens control unit that controls the lens unit to change the focal length of the lens for each portion of the lens unit so that the focal length of the lens increases as the angle of the line of sight of the observer with respect to the lens increases. Is provided.

Also, according to the present disclosure, includes a lens focal length is variable, information indicating a lens unit which spatially separates the light corresponding to the pixels arranged on the display surface by the lens, the position of the observer And the focal length of the lens is changed for each portion of the lens portion so that the focal length of the lens increases as the angle of the line of sight of the observer with respect to the lens increases. An electronic apparatus having a display device including a lens control unit is provided.

Also, according to the present disclosure, it includes a lens focal length is variable, includes a lens control unit for controlling the lens unit to be spatially separated light corresponding to the pixels arranged on the display surface by the lens, The lens control unit is configured such that, based on information indicating the position of the observer, the lens unit is provided for each part of the lens unit such that the focal length of the lens increases as the angle of the line of sight of the observer with respect to the lens increases. A control circuit is provided for changing the focal length.

  For example, there is a lens whose focal length is variable, such as a liquid crystal lens or a liquid lens. When a lens unit such as a lenticular lens is realized by such a lens, if the focal length of each lens constituting the lens unit is controlled based on information indicating the position of the observer, even if the position of the observer changes, It is possible to maintain a state where each observed pixel is in focus.

  As described above, according to the present disclosure, the focal length of a lens can be optimized in a lenticular lens type display device.

1 is a diagram schematically illustrating a configuration of a display device according to a first embodiment of the present disclosure. FIG. 3 is a diagram illustrating configurations of an LCD and a liquid crystal lens of the display device according to the first embodiment of the present disclosure. It is a figure which shows the focal distance of a lenticular lens when a display apparatus is observed from the front. It is a figure which shows the focal distance of a lenticular lens when a display apparatus is observed from diagonally. It is a figure for demonstrating the outline | summary of the focal distance change in 1st Embodiment of this indication. 6 is a diagram for describing a configuration for changing a focal length of a liquid crystal lens in the first embodiment of the present disclosure. FIG. It is a figure showing an example of electrode arrangement of a liquid crystal lens in a 1st embodiment of this indication. It is a figure which shows the intensity profile of the depth direction of the liquid-crystal lens shown in FIG. It is a figure which shows the intensity | strength profile in the lens width direction of the liquid crystal lens shown in FIG. It is a graph which shows the simulation result of the phase difference of the liquid crystal lens shown in FIG. It is a graph which shows the simulation result of the phase difference of the liquid crystal lens shown in FIG. It is a figure for demonstrating the modification of 1st Embodiment of this indication. It is a figure for demonstrating the structure which changes the focal distance of a liquid lens in 2nd Embodiment of this indication. It is a figure which shows the external appearance of the electronic device which has a display apparatus which concerns on embodiment of this indication. It is a figure which shows the external appearance of the electronic device which has a display apparatus which concerns on embodiment of this indication. It is a figure which shows the external appearance of the electronic device which has a display apparatus which concerns on embodiment of this indication.

  Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

The description will be made in the following order.
1. 1. First embodiment 1-1. Schematic configuration of display device 1-2. Focal length of lenticular lens 1-3. Configuration in which focal length is variable 1-4. Configuration example of liquid crystal lens 1-5. Modification 1-6. Summary of Embodiments 2. Second embodiment 3. 3. Embodiment related to electronic device Supplement

(1. First embodiment)
(1-1. Schematic configuration of display device)
First, a schematic configuration of a display device according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram schematically illustrating a configuration of a display device according to the first embodiment of the present disclosure. FIG. 2 is a diagram illustrating configurations of the LCD and the liquid crystal lens of the display device according to the first embodiment of the present disclosure.

  Referring to FIG. 1, the display device 100 includes an LCD (Liquid Crystal Display) 110, a liquid crystal lens unit 120, a control circuit 130, and an image acquisition unit 140. The display device 100 is a stereoscopic display device that presents a viewpoint image having parallax to the left and right eyes of an observer by spatially separating light of an image displayed on the LCD 110 by the liquid crystal lens unit 120. The configuration of the display device 100 can be easily applied to, for example, a directional display device that presents different viewpoint images to a plurality of observers with different positions. That is, the embodiment related to the directional display device can be realized in the same manner as the embodiment related to the stereoscopic display device described below.

  Referring also to FIG. 2, the LCD 110 includes polarizing plates 111 and 115, a terminal substrate 112, a liquid crystal layer 113, and a color filter substrate 114. The LCD 110 displays an image with pixels arranged on the display surface. A TFT (Thin Film Transistor) and a transparent pixel electrode are disposed on the terminal substrate 112, and a voltage is applied to the liquid crystal layer 113 between the transparent common electrode formed on the color filter substrate 114 side. Accordingly, the transmission of light from a backlight (not shown) is controlled for each region corresponding to each color of the color filter formed on the color filter substrate 114, and the color of each pixel is expressed. The LCD 110 and the liquid crystal lens unit 120 are bonded together using an adhesive (not shown).

  The liquid crystal lens unit 120 includes a terminal substrate 121, a liquid crystal layer 122, and a counter substrate 123. The liquid crystal lens unit 120 is an example of a lens unit that spatially separates light corresponding to pixels. The transparent electrode arranged on the terminal substrate 121 applies a voltage to the liquid crystal layer 122 between the transparent electrode arranged on the counter substrate 123 side and changes the refractive index of light of the liquid crystal layer 122 for each region. . As a result, the liquid crystal layer 122 equivalently generates the same lens effect as the lenticular lens in which cylindrical lenses are arranged. FIG. 2 shows a cylindrical lens 122L that is equivalently realized. The light corresponding to each pixel of the LCD 110 is spatially separated by each cylindrical lens 122L, and the displayed image is divided into two viewpoint images for displaying a stereoscopic image.

  The control circuit 130 is realized by software or hardware by, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), or a DSP (Digital Signal Processor), and is displayed. Each part of the apparatus 100 is controlled. The control circuit 130 may operate according to a program stored in a storage device (not shown) or a removable recording medium. In the present embodiment, the control circuit 130 realizes a function including the display control unit 131 and the lens control unit 132.

  The display control unit 131 controls display on the LCD 110. The display control unit 131 displays an image on the LCD 110 based on, for example, image data stored in a storage device or a removable recording medium, image data received by broadcast waves, or image data distributed by streaming via a network. Is displayed. In the present embodiment, the display control unit 131 causes the LCD 110 to display an image in which the viewpoint images are alternately arranged corresponding to the spatial separation of the light of each pixel by the liquid crystal lens unit 120.

  The lens control unit 132 controls the liquid crystal lens unit 120. As described above, the liquid crystal lens unit 120 applies a voltage to the liquid crystal layer 122 to change the refractive index of light for each region. For example, the lens control unit 132 controls the applied voltage to adjust the focal length of the lenticular lens that is equivalently realized by the liquid crystal lens unit 120. An example of adjustment of the focal length of the lenticular lens by the lens control unit 132 will be described later.

  The image acquisition unit 140 is an example of an observation position information acquisition unit that acquires information on the observation position of the display device 100. In the present embodiment, the image acquisition unit 140 is an interface connected to an imaging device that acquires an image of an observer of the display device 100. The control circuit 130 has a function of executing image processing on the image acquired by the image acquisition unit 140 and specifying the position of the observer (for example, expressed by coordinates set in the space around the display device 100). Furthermore, you may have.

  In another embodiment, the observation position information acquisition unit is not necessarily an image acquisition unit. For example, the observation position information acquisition unit may be a sensor that detects the position of the observer using infrared rays or the like. For example, when the display device 100 is mounted on a mobile device, a three-dimensional acceleration sensor that detects the inclination of the housing of the mobile device may be used as the observation position information acquisition unit (for example, the housing is If it is tilted, it is determined that the observer is in a position to observe the display device 100 obliquely).

  Alternatively, the observation position information acquisition unit may recognize the position of the observer based on an operation input from the observer or the like. In this case, for example, selection of an observation direction such as “view from the left”, “view from the front”, and “view from the right” may be provided as an operation command of the device having the display device 100.

  In the present embodiment, the lens control unit 132 controls the liquid crystal lens unit 120 based on information on the observation position of the image acquired by the image acquisition unit 140, and the lenticular lens equivalently realized in the liquid crystal lens unit 120. Change the focal length. For example, the lens control unit 132 may determine the focal length with reference to a table stored in a ROM, a storage device, or the like that associates the coordinate information of the observer with the focal length of the lenticular lens. At this time, the lens control unit 132 may change the focal length of each cylindrical lens included in the lenticular lens uniformly, or may set a different focal length for each cylindrical lens as described later.

(1-2. Focal length of lenticular lens)
Next, the focal length of the lenticular lens will be described with reference to FIG. 2, FIG. 3, and FIG. FIG. 3 is a diagram illustrating the focal length of the lenticular lens when the display device is observed from the front. FIG. 4 is a diagram illustrating the focal length of the lenticular lens when the display device is observed obliquely.

Referring to FIG. 2, when the viewing angle when observing the display device 100 is θ1, assuming that the viewing angle after being refracted by being incident on the counter substrate 123 is θ2, the observation is made through the cylindrical lens 122L. The pixels to be processed are pixels that are shifted by Δx = d ₀ · tan θ 2 from the pixels in front of the cylindrical lens 122L (d ₀ is the shortest distance from the principal point of the cylindrical lens 122L to the display surface). Accordingly, the optimum focal length d in this case is d ₀ · cos ⁻¹ (θ2).

For example, when d ₀ = 710 μm under certain conditions, the optimum focal length d when the angle θ1 = 60 ° is 870 μm. Thus, there is a large difference in the optimum focal length d between the case where the display device 100 is observed from the front and the case where the display device 100 is observed from an oblique direction.

The above phenomenon is the same even when the order of the value of d ₀ is different, for example. For example, when d ₀ = 7100 μm, the optimum focal length when the angle θ1 = 60 ° is 8700 μm.

  3 and 4 are diagrams for explaining the change in the optimum focal length as described above over a wider range.

  First, in the state shown in FIG. 3, the observer is located near the front of the display device. In the illustrated example, light that is observed by the observer's left eye eL and right eye eR via each of the three cylindrical lenses 122L1 to 122L3 is shown. For example, for the light observed by the left eye eL through the cylindrical lens 122L1, the distance from the cylindrical lens 122L1 to the observed pixel, that is, the optimum focal length is d1. The optimum focal length is d2 for the light observed by the right eye eR via the cylindrical lens 122L1.

  Therefore, in this case, for example, the focal length of the cylindrical lens 122L1 may be set to an average value of the distance d1 and the distance d2. Similarly, the focal length of the cylindrical lens 122L2 can be set to an average value of, for example, the optimum focal length d3 for the left eye and the optimum focal length d4 for the right eye. Further, the focal length of the cylindrical lens 122L3 can be set to an average value of, for example, the optimum focal length d5 for the left eye and the optimum focal length d6 for the right eye. Thus, in the illustrated state, the focal length of the cylindrical lens 122L becomes close to the optimum focal length for each of the left eye eL and the right eye eR, and a stereoscopic image with good image quality can be provided.

  On the other hand, in the state shown in FIG. 4, the observer is moving rightward in the figure from near the front of the display device. As a result, for each of the cylindrical lenses 122L1 to 122L3, the pixel observed through the lens changes, and thus the optimum focal length also changes. For example, the optimum focal length of light observed by the left eye eL via the cylindrical lens 122L1 is d1 'longer than d1 in the example of FIG. In addition, the optimum focal length of light observed by the right eye via the cylindrical lens 122L1 is d'2 longer than d2.

  Therefore, in this case, when the focal length of the cylindrical lens 122L1 is set to an average value of the distance d1 and the distance d2, the focal point of the cylindrical lens 122L1 is positioned in front of the display surface where the observed pixel is located. To do. That is, the pixel observed through the cylindrical lens 122L1 is observed in a defocused state. The same applies to the cylindrical lens 122L2.

  In this way, when the pixel is observed in a defocused state, it may be observed that crosstalk may occur or the image may be colored due to the difference in the apparent light collection width for each pixel. There is a possibility that the image quality of the stereoscopic image is deteriorated.

  Therefore, in the display device 100 according to the present embodiment, the lens control unit 132 controls the liquid crystal lens unit 120 based on the information on the position of the observer acquired using the image acquisition unit 140, and each cylindrical lens 122L is controlled. Change the focal length. For example, the lens control unit 132 may change the focal length of each cylindrical lens 122 </ b> L when it is detected that the position of the observer has changed based on information from the image acquisition unit 140.

(1-3. Configuration in which focal length is variable)
Next, a configuration in which the focal length of the lenticular lens is made variable in the display device according to the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram for describing an overview of a change in focal length in the first embodiment of the present disclosure. FIG. 6 is a diagram for describing a configuration for changing the focal length of the liquid crystal lens in the first embodiment of the present disclosure.

  FIG. 5 shows a case where the pixels 113a to 113c are observed through the cylindrical lens 122L included in the lenticular lens equivalently realized by the liquid crystal layer 122 of the liquid crystal lens unit 120. In the figure, the case where the focal length does not change is shown as (a), and the case where the focal length changes is shown as (b).

  In the example of (a), the focal length of the cylindrical lens 122L is fixed at the distance to the pixel 113c. In this case, when the pixels 113a and 113b are observed, the focal point of the cylindrical lens 112L is not positioned on the display surface. That is, the pixels 113a and 113b are observed in a defocused state. In this case, the quality of the observed stereoscopic image may be deteriorated as described above.

  Therefore, in the display device 100 according to the present embodiment, as shown in FIG. 5B, in the case where each of the pixels 113a to 113c is observed, the distance between the cylindrical lens 122L and the observed pixel is approached. The focal length of the cylindrical lens 122L is changed. Thereby, when each pixel is observed, the focal point of the cylindrical lens 122L can be positioned on the display surface, that is, the focal length of the cylindrical lens can be matched with the optimum focal length. Therefore, in the display device 100, even when the observation position changes, the image quality of the observed stereoscopic image can be maintained satisfactorily.

  FIG. 6 shows a configuration of a liquid crystal lens that enables the change in focal length as described above. As described above, the liquid crystal lens unit 120 equivalently generates a lens effect by changing the refractive index of light for each region by applying a voltage to the liquid crystal layer 122. Therefore, in the present embodiment, the lens control unit 132 changes the applied voltage when the pixel 113c is observed (a) and when the pixel 113a is observed (b).

  More specifically, in the case of (a), the lens control unit 132 shortens the focal length of the cylindrical lens 122L by controlling the applied voltage to be larger as a whole. On the other hand, in the case of (b), the lens control unit 132 increases the focal length of the cylindrical lens 122L by controlling the applied voltage to be smaller as a whole.

  A specific example of setting the applied voltage for changing the focal length in this way will be described in more detail in the following configuration example of the liquid crystal lens.

(1-4. Configuration Example of Liquid Crystal Lens)
Next, a configuration example and a simulation result of the liquid crystal lens in the present embodiment will be described with reference to FIGS. FIG. 7 is a diagram illustrating an example of the electrode arrangement of the liquid crystal lens according to the first embodiment of the present disclosure. FIG. 8 is a diagram showing an intensity profile in the depth direction of the liquid crystal lens shown in FIG. FIG. 9 is a diagram showing an intensity profile in the lens width direction of the liquid crystal lens shown in FIG. 10 and 11 are graphs showing simulation results of the phase difference of the liquid crystal lens shown in FIG.

  Referring to FIG. 7, in the liquid crystal lens unit 120, one cylindrical lens 122L is equivalent to the transparent electrodes e2 to e8 disposed on the terminal substrate 121 and the common transparent electrode e1 disposed on the counter substrate 123 side. Is realized. The potential difference between the transparent electrodes e2 to e8 and the common transparent electrode e1 is set so that, for example, the refractive index of the liquid crystal layer 122 is larger near the center of the cylindrical lens 122L and smaller near the end.

  As an example, when the focal length of the cylindrical lens 122L is to be changed between 710 μm and 850 μm, for example, a voltage may be applied to each electrode as shown in Table 1 below.

  In addition, said numerical value is an example and an actual numerical value changes with the materials and thickness of a liquid crystal layer, for example. The number of electrodes corresponding to one lens is not limited to the above example, and can be set arbitrarily.

  FIG. 8 is a diagram showing the intensity profile in the depth direction of the cylindrical lens that is equivalently realized by applying the voltage as described above, based on the result of the simulation. According to this result, in the example (a) in which the focal length is set to 710 μm, the condensing point is located near d = 710 μm. In the example of (b) in which the focal length is set to 850 μm, the condensing point is located near d = 850 μm. This result indicates that it is possible to equivalently realize lenses having different focal lengths by controlling the voltage applied to the liquid crystal lens.

  FIG. 9 is a diagram showing an intensity profile in the lens width direction of the cylindrical lens that is equivalently realized by applying the voltage as described above, based on the result of the simulation. According to this result, in the example of (a) in which the focal length is set to 710 μm, the light intensity near the center of the lens shows a sharp peak at the position where the distance from the lens is 710 μm. On the other hand, in the example of (b) in which the focal length is set to 850 μm, the light intensity near the center of the lens shows a sharp peak at a distance of 850 μm from the lens. This result indicates that it is possible to equivalently realize lenses having different focal lengths by controlling the voltage applied to the liquid crystal lens.

  FIG. 10 is a graph showing a simulation result of the phase difference of the cylindrical lens that is equivalently realized by applying the voltage as described above in comparison with an ideal phase difference distribution at each focal length. The unit of phase difference shown in the graph is π. According to this result, the phase difference distribution close to the ideal phase difference distribution can be realized in both the example of (a) in which the focal length is set to 710 μm and the example of (b) in which the focal length is set to 850 μm. I understand.

  FIG. 11 is a graph showing the simulation results of the phase difference of the cylindrical lens equivalently realized by applying the voltage as described above, with the results at the respective focal lengths superimposed. According to this result, it is understood that the phase difference distribution optimized for different focal lengths can be realized by adjusting the voltage applied to the liquid crystal layer.

(1-5. Modification)
Next, a modification of the present embodiment will be described with reference to FIG. FIG. 12 is a diagram for describing a modification example of the first embodiment of the present disclosure.

  In the state shown in FIG. 12, the observer is located away from the vicinity of the front of the display device. In the illustrated example, light that is observed by the observer's left eye eL and right eye eR via each of the three cylindrical lenses 122L1 to 122L3 is shown. For example, for the light observed by the left eye eL through the cylindrical lens 122L1, the distance from the cylindrical lens 122L1 to the observed pixel, that is, the optimum focal length is d11. For the light observed by the right eye eR via the cylindrical lens 122L1, the optimum focal length is d12. Similarly, optimum focal lengths d13 and d14 are defined for the cylindrical lens 122L2, and optimum focal lengths d15 and d16 are defined for the cylindrical lens 122L3.

  In this case, as shown in the drawing, when the line-of-sight angle is large, the difference in optimum focal length between the cylindrical lenses 122L becomes large. That is, the difference between the average value of the distance d11 and the distance d12 and the average value between the distance d15 and the distance d16 is, for example, the average value of the distance d1 ′ and the distance d2 ′ in the example of FIG. 4 and the distance d5 ′ and the distance. It is larger than the difference from the average value during d6 ′. Therefore, if the focal length is uniformly set for the entire lenticular lens equivalently realized in the liquid crystal lens unit 120, the defocusing of the pixels exceeds the allowable range for some cylindrical lenses 122L. there is a possibility.

  Therefore, in this modification, the lens control unit 132 of the display device 100 sets a different focal length for each portion of the liquid crystal lens unit 120. More specifically, the lens controller 132 gradually decreases the applied voltage in the order of the cylindrical lenses 122L3, 122L2, and 122L1, and sets a longer focal length. That is, if the focal length of the cylindrical lens 122L1 is f1, the focal length of the cylindrical lens 122L2 is f2, and the focal length of the cylindrical lens L3 is f3, then f1> f2> f3.

  According to this modification, for example, even in a larger display device 100, it is possible to prevent deterioration of the image quality of the observed stereoscopic image. For example, in a relatively small display device 100 mounted on a mobile device, the difference between the positions of the display surfaces as described above is not significant, and the focal length is set uniformly over the entire liquid crystal lens unit. In some cases, sufficient effects can be obtained.

(1-6. Summary of Embodiment)
In the first embodiment of the present disclosure described above, in the stereoscopic display device using the liquid crystal lens, the focal length of the liquid crystal lens changes according to the observation position of the image displayed on the display device. The focal length of the liquid crystal lens can be changed by adjusting the magnitude of the voltage applied to the liquid crystal layer. The information on the observation position of the image may be acquired by analyzing the image of the observer, for example, may be acquired from the detection result of another type of sensor, or by operation input of the observer or the like May be given.

  Thereby, for example, when the position where the image is observed changes in the display device, the focal length of the liquid crystal lens is changed in accordance with the change, and the pixel observed through the liquid crystal lens is kept in focus. As a result, it is possible to maintain a good image quality of the stereoscopic image.

  In the liquid crystal lens, a different focal length may be set for each portion. Thus, for example, even when the display device is large and the difference in the optimum focal length for each portion of the display surface is large, an appropriate focal length is set for each portion of the liquid crystal lens, and pixels with different positions are set. It is possible to prevent a difference in image quality between them.

(2. Second Embodiment)
Subsequently, a second embodiment of the present disclosure will be described with reference to FIG. FIG. 13 is a diagram for describing a configuration in which the focal length of the liquid lens is changed in the second embodiment of the present disclosure.

  As shown in FIG. 13, in this embodiment, a liquid lens is used instead of the liquid crystal lens. In other respects, the configuration of the present embodiment is substantially the same as that of the first embodiment, and a detailed description thereof will be omitted.

  The liquid lens unit 220 includes a terminal substrate 121, a liquid lens layer 222, and a counter substrate 123. The liquid lens unit 220 is an example of a lens unit that spatially separates light corresponding to pixels. In the liquid lens layer 222, a lens chamber formed by the electrode 222f and the insulating film 222e is filled with the first liquid 222o and the second liquid 222w. The first liquid 222o and the second liquid 222w are liquids having different refractive indexes of light and forming an interface between them. As a combination of such liquids, for example, the first liquid 222o may be oil and the second liquid 222w may be water.

  In the liquid lens layer 222, the surface tension of the first liquid 222o changes depending on the voltage applied to the electrode 222f. For example, as in the examples shown in FIGS. The shape of the interface changes. The liquid lens unit 220 makes the liquid lens layer 222 function as a lenticular lens using such properties. In the liquid lens unit 220, one lens does not necessarily have to be formed in one lens chamber as shown in the drawing, and one lens may extend across a plurality of lens chambers.

  As the configuration of the liquid lens unit, various known configurations as described in, for example, Japanese Patent Application Laid-Open No. 2011-095369 can be employed.

  In the display device according to the present embodiment, the lens control unit 132 controls the liquid lens unit 220 based on the information on the observation position of the image acquired by the image acquisition unit 140, and the lenticular lens realized by the liquid lens unit 220. Change the focal length. Here, the lens controller 132 changes the focal length of the lenticular lens by controlling the voltage applied to the electrode 222f and changing the interface shape of the first liquid 222o in each lens chamber.

  With this configuration, it is possible to set an appropriate lens focal length in accordance with a change in the position of the observer, as in the first embodiment. It is also possible to set different focal lengths for each part of the liquid lens and to prevent a difference in image quality between pixels having different positions.

(3. Embodiments related to electronic equipment)
Next, an example of an embodiment of the present disclosure relating to an electronic device will be described with reference to FIGS.

  FIG. 14 is a diagram illustrating an appearance of a television device that is an example of an electronic apparatus including the display device according to the embodiment of the present disclosure. The television device 10 includes an imaging unit 11, a display unit 12, and the like. The display unit 12 is realized using the display device according to the embodiment of the present disclosure as described in the above embodiment. Further, the image acquisition unit of the display device may acquire an observer's image from the imaging unit 11. The display unit 12 may be a touch screen.

  FIG. 15 is a diagram illustrating an appearance of a digital camera that is an example of an electronic apparatus including the display device according to the embodiment of the present disclosure. The digital camera 20 includes an imaging unit 21, a shutter button 22 that is an operation unit, a display unit 23, and the like. The display unit 23 is realized by using the display device according to the embodiment of the present disclosure as described in the above embodiment. The display unit 23 may be a touch screen. The digital camera 20 may further include a sub imaging unit 24 on the observer side of the display unit 23, and the image acquisition unit of the display device may acquire the observer's image from the sub imaging unit 24.

  FIG. 16 is a diagram illustrating an appearance of a mobile phone (smart phone) that is another example of the electronic apparatus including the display device according to the embodiment of the present disclosure. The mobile phone 30 includes an imaging unit 31, an operation button 32 that is an operation unit, a display unit 33, and the like. The display unit 33 is realized by using the display device according to the embodiment of the present disclosure as described in the above embodiment. The display unit 33 may be a touch screen. The mobile phone 30 may further include a sub imaging unit 34 on the observer side of the display unit 33, and the image acquisition unit of the display device may acquire the observer's image from the sub imaging unit 34.

(4. Supplement)
In the above-described embodiment, the embodiment of the display device using the LCD has been described. However, the embodiment of the present disclosure is not limited to this. For example, a self-luminous display such as an organic EL (Electro Luminescence) display may be used instead of the LCD. Further, the lens unit is not limited to the one using the liquid crystal lens or the liquid lens described above, and any lens unit may be used as long as a lens having a variable focal length is used.

  The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field of the present disclosure can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that it belongs to the technical scope of the present disclosure.

The following configurations also belong to the technical scope of the present disclosure.
(1) a lens unit including a lens having a variable focal length, and spatially separating light corresponding to pixels arranged on a display surface by the lens;
A display device comprising: a lens control unit that controls the lens unit based on information indicating a position of an observer to change a focal length of the lens.
(2) The display device according to (1), wherein the lens control unit changes a focal length of the lens so as to approach a distance between the lens and the pixel observed through the lens.
(3) The display device according to (1) or (2), wherein the lens control unit changes a focal length of the lens when the position of the observer is changed.
(4) The display device according to any one of (1) to (3), wherein the lens control unit changes a focal length of the lens so as to be different for each part of the lens unit.
(5) The display device according to any one of (1) to (4), further including an observation position information acquisition unit that acquires information indicating the position of the observer.
(6) The display device according to (5), wherein the observation position information acquisition unit is an image acquisition unit that acquires an image of an observer.
(7) The display device according to (5), wherein the observation position information acquisition unit is a sensor that detects an inclination of a housing of a device including the display device.
(8) The display device according to (5), wherein the observation position information acquisition unit is an operation input unit that acquires an operation input that specifies a position of the observer.
(9) The lens is a liquid crystal lens,
The display device according to any one of (1) to (8), wherein the lens control unit controls an applied voltage of the liquid crystal lens.
(10) The lens is a liquid lens,
The display device according to any one of (1) to (8), wherein the lens control unit controls an applied voltage of the liquid lens.
(11) a lens unit that includes a lens having a variable focal length, and spatially separates light corresponding to pixels arranged on a display surface by the lens;
An electronic apparatus comprising: a display device including: a lens control unit that controls the lens unit based on information indicating a position of an observer to change a focal length of the lens.
(12) a lens control unit that includes a lens having a variable focal length, and controls a lens unit that spatially separates light corresponding to pixels arranged on a display surface by the lens;
The lens control unit is a control circuit that changes the focal length of the lens based on information indicating the position of the observer.

100 display device 110 LCD
DESCRIPTION OF SYMBOLS 120 Liquid crystal lens part 122 Liquid crystal layer 122L Cylindrical lens 130 Control circuit 131 Display control part 132 Lens control part 140 Image acquisition part 220 Liquid lens part 222 Liquid lens layer 10, 20, 30 Electronic device

Claims (11)

A lens unit including a lens having a variable focal length, and spatially separating light corresponding to pixels arranged on a display surface by the lens;
The lens unit is controlled based on information indicating the position of the observer, and the focal length of the lens increases as the angle of the line of sight of the observer with respect to the lens increases. And a lens control unit that changes a focal length of the lens. The display according to claim 1 , wherein the lens control unit changes a focal length of the lens so that a focal length of the lens approaches a distance between the lens and the pixel observed through the lens. apparatus. The display device according to claim 1, wherein the lens control unit changes a focal length of the lens when the position of the observer is changed. The display device according to claim 1, further comprising an observation position information acquisition unit that acquires information indicating the position of the observer. The display device according to claim 4 , wherein the observation position information acquisition unit is an image acquisition unit that acquires an image of the observer. The display device according to claim 4 , wherein the observation position information acquisition unit is a sensor that detects an inclination of a housing of a device having the display device. The display device according to claim 4 , wherein the observation position information acquisition unit is an operation input unit that acquires an operation input that specifies a position of the observer. The lens is a liquid crystal lens,
The display device according to claim 1, wherein the lens control unit controls an applied voltage of the liquid crystal lens. The lens is a liquid lens;
The display device according to claim 1, wherein the lens control unit controls an applied voltage of the liquid lens. A lens unit including a lens having a variable focal length, and spatially separating light corresponding to pixels arranged on a display surface by the lens;
The lens unit is controlled based on information indicating the position of the observer, and the focal length of the lens increases as the angle of the line of sight of the observer with respect to the lens increases. An electronic apparatus comprising: a display device including: a lens control unit that changes a focal length of the lens. A lens control unit that includes a lens having a variable focal length, and controls a lens unit that spatially separates light corresponding to pixels arranged on a display surface by the lens;
The lens control unit is configured so that, based on information indicating the position of the observer, the lens for each part of the lens unit such that the focal length of the lens increases as the angle of the line of sight of the observer with respect to the lens increases. A control circuit that changes the focal length of the lens.

Images