JP2011209346A - Display device, drive control method of the same, and electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device for setting an arbitrary display color in a display area by a simple structure and a simple control method and switching between a 2D image and a 3D image, a drive control method of the display device, and an electronic device.SOLUTION: The display device 100 includes an image display part 110, and a parallax barrier setting part 120. In the image display part 110, a plurality of light emitting pixels PIX arranged two-dimensionally on a display panel 111 emits light at a luminance gray level corresponding to image data, to display a gradation image on the display panel 111. In the parallax barrier setting part 120, a predetermined voltage is applied to a stripe electrode E1 of a parallax barrier setting panel 121, for black line display, to form a parallax barrier. In this way, the gradation image displayed on the display panel 111 is observed as a stereoscopic image through the parallax barrier setting panel 121.

Description

  The present invention relates to a display device, a drive control method thereof, and an electronic device, and in particular, a display device including a light emitting panel in which a plurality of pixels each having a light emitting element are arranged, a drive control method thereof, and the display device are mounted. It relates to electronic equipment.

  2. Description of the Related Art In recent years, thin, lightweight, power-saving liquid crystal display devices and organic electroluminescence (hereinafter abbreviated as “organic EL”) as monitors for thin televisions and personal computers, and as display devices for mobile phones and portable music players. ) The spread of display devices is remarkable. In particular, a light-emitting element type display device including a display panel (light-emitting panel) in which a plurality of pixels having light-emitting elements are arranged in a matrix like an organic EL display device has attracted attention. Here, as a light emitting element applicable to a light emitting element type display device, for example, an organic EL element, an inorganic EL element, a light emitting diode (LED), and the like are known.

  In such display devices, various display methods are known. For example, a mono-color display method for displaying image information by monochromatic light emission, an area color display method (or block color display method) for displaying an arbitrary light emission color for each specific area in the display area, There are full-color display methods for performing color display using the three primary colors of light.

  Here, in the full color display method, each pixel arranged on the display panel needs to display one of the three colors of red (R), green (G), and blue (B). As a method for realizing such a full color display, a light emitting element provided in each pixel emits light in any one of RGB colors, and a combination of these three color pixels performs a full color display is known. Yes. In addition, there is also known one that performs full-color display by disposing RGB color filter layers on the front surface (view side) of a display panel made of a light emitting element that emits white light. The structure of a display device to which such a full color display method is applied is described in, for example, Patent Document 1 and the like.

JP 2009-205929 A

  By the way, in the display device, it may be required to change the display color depending on the application. However, in the mono-color display method, although the gradation can be expressed, the display color cannot be changed. Also in the area color display method, since the color development is fixed in advance for each area, the display color for each area cannot be changed. On the other hand, in the full-color display method, the display color can be changed by a combination of RGB three-color pixels, but it is necessary to form each pixel so as to have different RGB colors. For example, in a display panel using an organic EL element as a light emitting element, it is necessary to form an organic layer (light emitting layer) of the organic EL element provided in each pixel so as to emit light in any of RGB. Therefore, the full-color display method has a problem that the panel structure and the manufacturing method are complicated, and it is difficult to reduce the cost of the product.

  Further, in recent years, thin televisions and displays capable of displaying stereoscopic images (3D images) have attracted attention. Such a stereoscopic display system is usually employed in a display or monitor of a full color display system. That is, a stereoscopic display type display that can change the color development by a monocolor display type has not been known. In addition, a display that can switch between a planar image (2D image) and a stereoscopic image with a simple control method has not been known.

  Therefore, in view of the above-described problems, the present invention can set an arbitrary display color in the display area with a simple configuration and control method, and can switch between a 2D image and a 3D image, and a drive thereof. It is an object to provide a control method and an electronic device.

  The display device according to claim 1 displays a gradation image by arranging a plurality of light emitting pixels that emit predetermined monochromatic light and emitting each of the light emitting pixels with a luminance gradation according to image data. An image display unit including a display panel, and a light shielding unit arranged on the side of the display panel on which light emitted from each light emitting pixel is emitted and arranged at equal intervals by applying a first voltage And a parallax barrier setting unit provided with a parallax barrier setting panel for forming a parallax barrier made of

According to a second aspect of the present invention, in the display device according to the first aspect, the parallax barrier setting panel includes transparent first electrodes arranged at equal intervals between substrates disposed opposite to each other, and the first A liquid crystal layer having a transparent common electrode that is commonly opposed to one electrode, and a liquid crystal molecule sealed between the first electrode and the common electrode, the first electrode, By applying the first voltage for setting the parallax barrier between the common electrode and changing the alignment state of the liquid crystal molecules, the light shielding portion is formed in the region where the first electrodes are arranged. It is characterized by doing.
According to a third aspect of the present invention, in the display device according to the first aspect, the parallax barrier setting unit includes a polarizing plate outside the parallax barrier setting panel, and the parallax barrier setting panel is disposed to face the parallax barrier setting panel. Transparent first electrodes arranged at equal intervals between the substrates, transparent second electrodes arranged in the gaps of the first electrodes, the first electrode and the second electrode A liquid crystal layer having a transparent common electrode facing each other in common, and liquid crystal molecules sealed between the first electrode, the second electrode, and the common electrode, and the first electrode By applying the first voltage for setting a parallax barrier between the common electrode and the common electrode, the alignment state of the liquid crystal molecules is changed, so that the light-shielding portion in the region where the first electrodes are arranged Forming a display color between the second electrode and the common electrode. The wavelength of light transmitted through the polarizing plate and the parallax barrier setting panel in a region where the second electrodes are arranged by changing the alignment state of the liquid crystal molecules by applying a predetermined second voltage A distribution is set.
According to a fourth aspect of the present invention, in the display device according to the third aspect, the first voltage applied between the first electrode and the common electrode is the same voltage value as the second voltage. And setting the wavelength distribution of light transmitted through the polarizing plate and the parallax barrier setting panel in a region where the first electrodes are arranged by changing the alignment state of the liquid crystal molecules. And
According to a fifth aspect of the present invention, in the display device according to the third or fourth aspect, in the parallax barrier setting panel, a light transmission region through which the monochromatic light emitted from the display panel is transmitted is divided into a plurality of regions. The first electrode and the second electrode are individually provided in each of the divided regions, and the first voltage and the second voltage are individually applied to each of the divided regions. To do.
According to a sixth aspect of the present invention, in the display device according to the first to fifth aspects, an organic electroluminescence element is applied to the light emitting pixel as a light emitting element that emits the monochromatic light.
An electronic apparatus according to a seventh aspect of the invention is characterized in that the display device according to any one of the first to sixth aspects is mounted.

  According to an eighth aspect of the present invention, there is provided a drive control method for a display device, which displays a gradation image on a display panel by causing a plurality of light emitting pixels to emit light in a single color with a luminance gradation corresponding to image data. By applying a first voltage to transparent first electrodes arranged at equal intervals on a parallax barrier setting panel disposed on the side from which the light emitted from each light emitting pixel is emitted, the first voltage is applied. A light shielding portion is formed in a region where the electrodes are arranged, and the gradation image is displayed as a stereoscopic image by transmitting through the parallax barrier formed of the light shielding portion.

According to a ninth aspect of the present invention, in the display device drive control method according to the eighth aspect, the transparent second array arranged in the gaps of the first electrodes arranged at equal intervals on the parallax barrier setting panel. By applying a second voltage to the electrodes, a wavelength distribution of light transmitted through the parallax barrier setting panel is set in a region where the second electrodes are arranged, and the gradation image is set to the parallax barrier setting panel. The stereoscopic image is displayed in a predetermined display color corresponding to the image data.
A tenth aspect of the present invention is the display device drive control method according to the ninth aspect, wherein the first voltage applied to the first electrode is set to the same voltage value as the second voltage. A wavelength distribution of light transmitted through the parallax barrier setting panel in the area where the first electrode is arranged and the area where the second electrode is arranged, and setting the gradation image as the parallax barrier setting panel The gradation image is displayed in a predetermined display color corresponding to the image data.
An eleventh aspect of the present invention is the display device drive control method according to the ninth or tenth aspect, wherein the first electrode and the second electrode in any region of the parallax barrier setting panel are connected to the first electrode. The gradation image or the stereoscopic image is displayed in a predetermined display color corresponding to the image data in the arbitrary region by applying a voltage and the second voltage.

  According to the present invention, an arbitrary display color can be set in the display area with a simple configuration and control method, and a 2D image and a 3D image can be switched.

It is a schematic block diagram which shows one Embodiment of the display apparatus which concerns on this invention. It is a schematic block diagram which shows an example of the image display part applied to the display apparatus which concerns on 1st Embodiment. FIG. 3 is an equivalent circuit diagram illustrating a circuit configuration example of a light emitting pixel applied to the image display unit according to the first embodiment. It is a schematic block diagram which shows an example of the parallax barrier setting panel applied to the display apparatus which concerns on 1st Embodiment. It is a schematic plan view which shows the electrode provided in each board | substrate which comprises the parallax barrier setting panel applied to the display apparatus which concerns on 1st Embodiment. It is a conceptual diagram for demonstrating the display principle of the 3D image using the parallax barrier system applied to 1st Embodiment. It is a conceptual diagram which shows the example of a display of the image information in the display apparatus which concerns on 1st Embodiment. FIG. 3 is a conceptual diagram illustrating a driving state of a display panel and a parallax barrier setting panel when performing 3D image display in the display device according to the first embodiment. It is. It is a schematic block diagram which shows an example of the parallax barrier setting panel applied to the display apparatus which concerns on 2nd Embodiment. It is a schematic plan view which shows the electrode provided in each board | substrate which comprises the parallax barrier setting panel applied to the display apparatus which concerns on 2nd Embodiment. It is a figure for demonstrating the arrangement | positioning relationship of the polarizing plate and liquid crystal layer in the parallax barrier setting part which concerns on 2nd Embodiment. It is a figure which shows the relationship between the wavelength (lambda) of the transmitted light, and the transmittance | permeability I when the applied voltage to a liquid-crystal layer is changed in the parallax barrier setting part which concerns on 2nd Embodiment. It is a figure which shows an example of wavelength distribution of the white light light-emitted from the organic EL element provided in a display panel. It is a figure which shows the relationship between the voltage applied to the liquid crystal layer in the parallax barrier setting part which concerns on 2nd Embodiment, and the wavelength distribution of transmitted light. It is a conceptual diagram which shows the example of a display at the time of carrying out mono color display of 2D image in the display apparatus which concerns on 2nd Embodiment. It is a conceptual diagram which shows the drive state of the display panel and parallax barrier setting panel at the time of performing 2D image display in the display apparatus which concerns on 2nd Embodiment. It is a conceptual diagram which shows the example of a display at the time of carrying out the monochromatic display of 3D image in the display apparatus which concerns on 2nd Embodiment. It is a conceptual diagram which shows the drive state of the display panel at the time of performing 3D image display, and the parallax barrier setting panel in the display apparatus which concerns on 2nd Embodiment. It is a conceptual diagram which shows the example of a display at the time of carrying out area color display of the 2D image in the display apparatus which concerns on 2nd Embodiment. It is a conceptual diagram which shows the example of a display at the time of carrying out area color display of the 3D image in the display apparatus which concerns on 2nd Embodiment. It is a perspective view which shows the structural example of the digital camera to which the display apparatus which concerns on this invention is applied. It is a figure which shows the structural example of the mobile telephone to which the display apparatus which concerns on this invention is applied.

Hereinafter, embodiments of a display device, a drive control method thereof, and an electronic apparatus according to the present invention will be described in detail with reference to the drawings.
<First Embodiment>
(overall structure)

  FIG. 1 is a schematic configuration diagram showing an embodiment of a display device according to the present invention. Here, FIG. 1A is a schematic perspective view showing an example of a display device according to the present embodiment, and FIG. 1B is a display panel and a parallax barrier applied to the display device according to the present embodiment. It is principal part sectional drawing which shows a laminated structure with a setting panel. In FIG. 1A, the display panel and the parallax barrier setting panel are shown as being spaced apart for convenience of illustration, but as shown in FIG. 1B, they are in close contact with each other. It is desirable to have a laminated structure.

As shown in FIG. 1A, the display device 100 according to the present invention roughly includes an image display unit 110 and a parallax barrier setting unit 120.
As shown in FIG. 1A, the image display unit 110 generally includes a display panel (light emitting panel) 111 and a display drive control circuit 112. In the display panel 111, pixels including light emitting elements (hereinafter referred to as “light emitting pixels” for convenience) are two-dimensionally arranged on one side of the substrate, and drive signals and gradation signals supplied from the display drive control circuit 112 are displayed. Based on this, each light emitting pixel is caused to emit light at a luminance gradation corresponding to the image data. As a result, a gradation image corresponding to the image data is displayed on the display panel 111. Here, when a stereoscopic image (3D image) is displayed on the display device 100, a gradation image obtained by combining the right-eye image and the left-eye image is displayed on the display panel 111, as will be described later.

  The light emitted from each light emitting pixel of the display panel 111 is emitted to the visual field side (one surface side or the other surface side) of the image display unit 110. As the display panel 111 used for such an image display unit 110, for example, an organic EL display panel including an organic EL element as a light emitting element can be applied. Note that the display drive control circuit 112 may be partly or wholly formed on a substrate constituting the display panel 111, or may be mounted in the form of an IC chip. There may be.

  Here, the display panel 111 to which the organic EL display panel is applied is, for example, as shown in FIG. 1B, an organic EL whose illustration is omitted between transparent substrates 11 and 13 such as glass arranged facing each other. A light emitting layer 12 in which a plurality of light emitting pixels including elements are two-dimensionally arranged is provided. As is well known, an organic EL element has a pair of electrodes that sandwich an organic EL layer. When a voltage is applied between the electrodes, the organic EL layer emits light and emits light. In the present embodiment, the light emitting material of the organic EL layer is appropriately set so that light emitted from the organic EL layer (light emitting layer 12) becomes, for example, white light. In the display panel 111 according to the present invention, the light emitted from the organic EL layer is not limited to white light, and may be any single color light such as green light or red light. . In that case, a light emitting material corresponding to the monochromatic light is applied to the organic EL layer. Of the pair of electrodes of the light emitting layer 12, the electrode on the parallax barrier setting unit 120 side described later is a transparent electrode, which transmits light emitted from the organic EL layer and transmits the parallax barrier setting unit 120 (parallax barrier setting panel). 121) to the side. The display panel 111 and the light emitting pixels to which the organic EL display panel is applied will be described in detail later.

  The parallax barrier setting unit 120 generally includes a parallax barrier setting panel 121 and a barrier control circuit 122. The parallax barrier setting panel 121 is arranged on the visual field side of the image display unit 110, and displays a gradation image on the display panel 111 based on a drive signal supplied from the barrier control circuit 122 when displaying a 3D image. In synchronization with the display operation, a plurality of black lines arranged in parallel at a predetermined interval are displayed in an area (light transmission area; light transmission region) through which light emitted from the display panel 111 is transmitted. As a result, the parallax barrier setting panel 121 functions as a parallax barrier, and the gradation image displayed on the display panel 111 is visually separated from the visual field side into image components for the right eye and the left eye. As described later, for example, a transmissive liquid crystal display panel including a liquid crystal element as a display element can be applied to such a parallax barrier setting unit 120. The barrier control circuit 122 may be partly or entirely formed integrally on a substrate constituting the parallax barrier setting panel 121, or mounted in the form of an IC chip (driver chip). It may be what has been done.

  Here, a parallax barrier setting panel 121 to which a transmissive liquid crystal display panel is applied includes, for example, a liquid crystal layer between transparent substrates 21 and 23 such as glass arranged facing each other as shown in FIG. 22 is provided. Like the known liquid crystal display panel, the liquid crystal layer 22 includes liquid crystal molecules and an alignment film that sandwiches the liquid crystal molecules between a pair of transparent electrodes formed on the surface of the opposing transparent substrate. By applying a voltage between them, the alignment state of the liquid crystal molecules is controlled. Thereby, for example, when no voltage is applied between the transparent substrates, the light incident on the parallax barrier setting panel 121 is transmitted through the entire region, whereas when a predetermined voltage is applied, the liquid crystal molecules are aligned. Accordingly, the incident light is partially blocked. In particular, in the present embodiment, one side of the pair of transparent electrodes that sandwich the liquid crystal molecules is formed to be branched or divided so as to be arranged at a predetermined interval in a specific direction on the panel plane of the parallax barrier setting panel 121. Yes. When displaying a 3D image, by applying a voltage between the transparent electrodes, a plurality of black lines are displayed at predetermined intervals along a region where the pair of transparent electrodes are opposed to each other, thereby functioning as a parallax barrier. . Note that the parallax barrier setting panel 121 to which the transmissive liquid crystal display panel is applied and the display principle of the parallax barrier type 3D image will be described in detail later.

  Further, in the parallax barrier setting unit 120 according to the present embodiment, polarizing plates 24 and 25 are provided outside the parallax barrier setting panel 121 having the substrates 21 and 23 facing each other with the liquid crystal layer 22 interposed therebetween. . The polarizing plates 24 and 25 are arranged so as to transmit only light having a predetermined polarization direction with respect to the rubbing direction of the alignment films adjacent to each other. Here, by further providing a circularly polarizing plate between the display panel 111 and the polarizing plate 24 and shifting the phase by, for example, λ / 4, the parallax barrier setting panel 121 is transmitted from the viewing side and incident on the display panel 111. The external light reflected by the display panel 111 is not transmitted to the visual field side, and reflection of the external light can be prevented.

Next, each configuration of the display device described above will be specifically described.
(Image display part)
FIG. 2 is a schematic configuration diagram illustrating an example of an image display unit applied to the display device according to the present embodiment. Here, a case where an organic EL display panel corresponding to a known active matrix driving method is applied as the image display unit applied to the present embodiment will be described. 2 shows a configuration in which the display drive control circuit 112 is provided separately from the display panel 111. As described above, part or all of the display drive control circuit 112 is provided on the substrate of the display panel 111. May be provided.

  As shown in FIG. 2, the image display unit 110 roughly includes a display panel 111 provided with a display area (display area) 12A on one surface side of the substrate 11 and light emitting pixels PIX arranged in the display area 12A as image data. And a display drive control circuit 112 having a driver function for emitting light at a luminance gradation according to the.

  As shown in FIG. 2, the display area 12 </ b> A of the display panel 111 is provided with a pixel array in which a plurality of light emitting pixels PIX having organic EL elements are two-dimensionally arranged. The pixel array is sealed by a substrate 13 (sealing substrate; not shown in FIG. 2; see FIG. 1B) disposed opposite to the substrate 11. That is, the pixel array provided in the display area 12A corresponds to the light emitting layer 12 described above. On the substrate 11 around the display area 12A, lead lines Lre are provided for electrically connecting the light emitting pixels PIX arranged in the display area 12A and the display drive control circuit 112.

  The display drive control circuit 112 has an IC chip form, for example, and is connected to each light emitting pixel PIX in the display area 12A directly or via a film substrate (flexible print substrate; FPC) or the like. ing. The display drive control circuit 112 has a driver function for causing at least each light emitting pixel PIX in the display area 12A to emit white light with a predetermined luminance gradation according to image data. Note that the display drive control circuit 112 may include a control function for controlling the driver function. Here, also in the parallax barrier setting unit 120 to be described later, the barrier control circuit 122 for driving the parallax barrier setting panel 121 has a control function. These control functions include those that generate and supply a control signal for driving the display panel 111 or the parallax barrier setting panel 121 based on the image data. It may be configured as a (system controller). As such a control circuit, for example, a circuit having a form of an IC chip can be applied.

(Luminescent pixel)
Next, the light emitting pixels PIX arranged in the display area 12A of the display panel 111 described above will be described with reference to the drawings.
FIG. 3 is an equivalent circuit diagram illustrating a circuit configuration example of a light emitting pixel applied to the image display unit according to the present embodiment.

  For example, as shown in FIGS. 3A and 3B, the light emitting pixel PIX applied to the present embodiment includes a light emission driving circuit (pixel circuit) DC and an organic EL element OEL which is a current driving type light emitting element. It is equipped with. The light emission drive circuit DC has a circuit configuration including one or more transistors (functional elements) and a capacitor. Further, the light emission drive circuit DC generates a light emission drive current having a current value corresponding to the image data, and supplies the light emission drive current to the organic EL element OEL. The organic EL element OEL emits white light with a luminance gradation corresponding to the image data based on the light emission drive current supplied from the light emission drive circuit DC.

  An example of the light emission drive circuit DC includes transistors Tr11 and Tr12 and a capacitor Cs as shown in FIG. 6A, for example. The transistor Tr11 has a gate terminal connected to the selection line Ls, a drain terminal connected to the data line Ld, and a source terminal connected to the contact N11. The transistor Tr12 has a gate terminal connected to the contact N11, a drain terminal connected to the power supply line La, and a source terminal connected to the contact N12. The capacitor Cs is connected between the gate terminal (contact N11) and the source terminal (contact N12) of the transistor Tr12. Here, the power supply line La is connected to a predetermined high potential power supply (power supply voltage Vsa).

  Further, the organic EL element OEL has an anode (a pixel electrode serving as an anode electrode described later) connected to a contact N12 of the light emission driving circuit DC, and a cathode (a counter electrode serving as a cathode electrode described later) connected to a predetermined low potential power source ( Reference voltage Vsc; for example, ground potential Vgnd).

  Here, for the transistors Tr11 and Tr12 shown in FIG. 3A, for example, an n-channel amorphous silicon thin film transistor or a polysilicon thin film transistor can be applied. The capacitor Cs may be a parasitic capacitance formed between the gate and the source of the transistor Tr12, or in addition to the parasitic capacitance, a separate capacitive element is connected in parallel between the contact N11 and the contact N12. There may be.

  The drive control operation in the light emitting pixel PIX having the circuit configuration as shown in FIG. 3A is first performed by a selection driver function provided in the display drive control circuit 112 shown in FIG. 2 during a predetermined selection period. A selection voltage (Vsel) of a selection level (high level) is applied to the selection line Ls from the part via the lead-out line Lre. As a result, the transistor Tr11 is turned on, and the light emitting pixel PIX is set to the selected state. In synchronization with this timing, the gradation voltage Vdata corresponding to the image data is applied from the data driver function unit provided in the display drive control circuit 112 to the data line Ld via the lead line Lre. As a result, a potential corresponding to the gradation voltage Vdata is applied to the contact N11 (that is, the gate terminal of the transistor Tr12) via the transistor Tr11.

  At this time, the current value of the drain-source current of the transistor Tr12 (that is, the light emission drive current flowing through the organic EL element OEL) is determined by the potential difference between the drain-source and the gate-source. That is, in the light emission drive circuit DC shown in FIG. 3A, the current value of the current flowing between the drain and source of the transistor Tr12 is controlled by the gradation voltage Vdata.

  Therefore, the transistor Tr12 is turned on in a conductive state according to the potential of the contact N11 (that is, the gradation voltage Vdata), and the transistor Tr12 and the organic EL element OEL are connected from the power supply line La to which the high potential side power supply voltage Vsa is applied. Through this, a light emission driving current having a predetermined current value flows in the reference voltage Vsc (ground potential Vgnd) on the low potential side. As a result, the organic EL element OEL emits white light with a luminance gradation corresponding to the gradation voltage Vdata (that is, image data). At this time, charges are accumulated (charged) in the capacitor Cs between the gate and the source of the transistor Tr12 based on the gradation voltage Vdata applied to the contact N11.

  Next, in a non-selection period after the end of the selection period, a selection voltage Vsel of a non-selection level (low level) is applied from the selection driver function unit of the display drive control circuit 112 to the selection line Ls. As a result, the transistor Tr11 is turned off and the light emitting pixel PIX is set to a non-selected state. At this time, the electric charge accumulated in the capacitor Cs is held, whereby the potential difference between the gate and the source of the transistor Tr12 is held, and a voltage corresponding to the gradation voltage Vdata is applied to the gate terminal (contact N11) of the transistor Tr12. Applied.

  Accordingly, as in the above selection state, a light emission drive current having a current value similar to that of the light emission operation state flows from the power supply line La to the organic EL element OEL via the transistor Tr12, and the light emission operation state is continued. This light emitting operation state is controlled so as to continue, for example, for one frame period until the gradation voltage Vdata corresponding to the next image data is written. Then, by sequentially executing such a drive control operation for every light-emitting pixel PIX two-dimensionally arranged in the display area 12A for each row, luminance gradation corresponding to image data is displayed from the entire display area 12A. White light (or any single color light) is emitted to the parallax barrier setting unit 120.

  In addition, another example of the light emission drive circuit DC includes transistors Tr21 and Tr22, a transistor Tr23, and a capacitor Cs as shown in FIG. 3B, for example. The transistor Tr21 has a gate terminal connected to the selection line Ls, a drain terminal connected to the power supply line La, and a source terminal connected to the contact N21. The transistor Tr22 has a gate terminal connected to the selection line Ls, a source terminal connected to the data line Ld, and a drain terminal connected to the contact N22. The transistor Tr23 has a gate terminal connected to the contact N21, a drain terminal connected to the power supply line La, and a source terminal connected to the contact N22. The capacitor Cs is connected between the gate terminal (contact N21) and the source terminal (contact N22) of the transistor Tr23.

  Further, the organic EL element OEL has an anode (a pixel electrode serving as an anode electrode) connected to the contact N22 of the light emission driving circuit DC and a cathode (a cathode electrode and a cathode electrode) as in the light emitting pixel PIX illustrated in FIG. Is connected to a predetermined low potential power source (reference voltage Vsc; for example, ground potential Vgnd).

  The drive control operation in the light emitting pixel PIX having such a circuit configuration is first selected from the selection driver function unit of the display drive control circuit 112 to the selection line Ls in the writing operation (selection period) to the light emission pixel PIX. By applying the level (high level) selection voltage Vsel, the light emitting pixel PIX is set to the selected state. At this time, a power supply voltage Vsa of a non-emission level (voltage level equal to or lower than the reference voltage Vsc; for example, a negative voltage) is applied from the power supply driver function unit provided in the display drive control circuit 112 to the power supply line La via the lead-out wiring Lre. ing. In this state, the gradation voltage Vdata set to a negative voltage value corresponding to the image data is supplied from the data driver function unit of the display drive control circuit 112 to the data line Ld. As a result, the transistors Tr21 to Tr23 are turned on, and the write current corresponding to the potential difference generated between the gate and source of the transistor Tr23 is transferred from the power supply line La to the data line Ld via the transistor Tr23, the contact N22, and the transistor Tr22. Flow in the direction.

  At this time, charges corresponding to the potential difference generated between the contacts N21 and N22 are accumulated in the capacitor Cs and held as a voltage component. Further, the power supply line La is applied with a power supply voltage Vsa of a non-light emitting level that is equal to or lower than the reference voltage Vsc, and further, a write current is set to flow from the light emitting pixel PIX to the data line Ld. As a result, the potential applied to the anode (contact N22) of the organic EL element OEL is lower than the cathode potential (reference voltage Vsc). Therefore, no current flows through the organic EL element OEL, and the organic EL element OEL Does not emit light (non-emission operation). Such a writing operation is sequentially executed for each row for all the light-emitting pixels PIX that are two-dimensionally arranged in the display area 12A.

  Next, in the light emission operation (non-selection period) after the end of the write operation, the selection driver function unit of the display drive control circuit 112 applies the selection voltage Vsel of the non-selection level (low level) to the selection line Ls, thereby emitting light. Pixel PIX is set to a non-selected state. Thereby, the transistors Tr11 and Tr12 are turned off. At this time, since the charge accumulated in the above-described write operation is held in the capacitor Cs, the transistor Tr23 maintains the on state. A power supply voltage Vsa having a light emission level (a voltage level higher than the reference voltage Vsc) is applied from the power supply driver function unit of the display drive control circuit 112 to the power supply line La, whereby the transistor Tr23 and the contact N22 are connected from the power supply line La. Thus, a predetermined light emission drive current flows through the organic EL element OEL.

  At this time, the voltage component held by the capacitor Cs corresponds to a potential difference when a write current corresponding to the gradation voltage Vdata is caused to flow in the transistor Tr23. Therefore, the light emission drive current flowing through the organic EL element OEL The current value is approximately the same as the current. Thereby, the organic EL element OEL of each light emitting pixel PIX emits white light with a luminance gradation corresponding to the image data (gradation voltage Vdata) written at the time of the writing operation, so that the entire display area 12A changes to the image data. The white light (or any single color light) with the corresponding luminance gradation is emitted to the parallax barrier setting unit 120.

  As described above, according to the image display unit 110 according to the present embodiment, the light emitting pixels PIX arranged in the display area 12A of the display panel 111 are based on the drive signal and image data supplied from the display drive control circuit 112. By emitting light at a predetermined luminance gradation, a gradation image composed of white light (or any single color light) is displayed.

  Here, in the present embodiment, when the 3D image is displayed on the display device 100 as the gradation image displayed in the display area 12A, the image components for the right eye and the left eye are arranged in the column direction of the display area 12A. A plurality of divided images for the right eye and for the left eye are arranged so as to be alternately adjacent in the row direction (left and right direction in FIG. 2) and displayed simultaneously.

  Note that the pixel circuit (light emission drive circuit DC) shown in FIGS. 3A and 3B applies the gradation voltage Vdata having a voltage value corresponding to the image data to the light emitting element of each light emitting pixel PIX. The case has been described in which a circuit configuration corresponding to a voltage designation type gradation control method in which a light emission driving current according to image data is supplied to perform light emission operation at a desired luminance gradation has been described. The pixel circuit applicable to the present invention is not limited to this. For example, by supplying a gradation current having a current value corresponding to the image data, the light emitting element of each light emitting pixel corresponds to the image data. It may be provided with a circuit configuration corresponding to a current designation type gradation control method in which a light emission driving current is supplied to perform light emission operation at a desired luminance gradation.

(Parallax barrier setting unit)
FIG. 4 is a schematic configuration diagram illustrating an example of a parallax barrier setting panel applied to the display device according to the present embodiment. Here, a case where a known transmissive liquid crystal display panel is applied as the parallax barrier setting panel applied to the present embodiment will be described. In FIG. 4, for the sake of clarity, the electrodes provided on the substrate and the sealing seal are hatched for the sake of convenience. Further, for the convenience of illustration, the substrate 23 serving as the counter substrate is omitted. FIG. 5 is a schematic plan view showing electrodes provided on each substrate constituting the parallax barrier setting panel shown in FIG. FIG. 5A is a schematic plan view showing the stripe electrode provided on the substrate 21 side, and FIG. 5B is a schematic plan view showing the common electrode provided on the substrate 23 side.

  As shown in FIG. 1B, the parallax barrier setting panel 121 provided in the parallax barrier setting unit 120 is arranged with transparent substrates 21 and 23 facing each other, and the liquid crystal layer 22 is interposed between the substrates 21 and 23. Is provided. More specifically, as illustrated in FIG. 4, the parallax barrier setting panel 121 transmits light through which white light (or any single color light) emitted from the image display unit 110 (display panel 111) described above is transmitted. Area 22A is set. Here, the light transmission area 22 </ b> A is set to have substantially the same extent so as to correspond to the display area 12 </ b> A set on the display panel 111.

  As shown in FIGS. 4 and 5A, the light transmission area 22A of the substrate 21 has a striped electrode extending in the vertical direction of the drawing (corresponding to the column direction) (hereinafter referred to as “striped electrode”). A plurality of first electrodes E1 are arranged at equal intervals in the horizontal direction of the drawing (corresponding to the row direction). Further, as shown in FIG. 4, the stripe electrode E1 is connected to a predetermined control voltage (first voltage) V1 via a single connection terminal Ts1.

On the other hand, as shown in FIGS. 4 and 5B, the substrate 23 facing the substrate 21 has a single solid electrode (hereinafter referred to as “common electrode”) Ec at least over substantially the entire light transmission area 22A. Is provided. Further, as shown in FIG. 4, the common electrode Ec is connected to the ground potential via one or a plurality of lead lines Lrc and connection terminals Tc1, Tc2 provided on the substrate 21 side. Here, the stripe electrode E1 and the common electrode Ec are, for example, tin-doped indium oxide (ITO) or zinc-doped indium oxide (Indium).
Zinc Oxide) or other transparent electrode material.

  4 and 5, the parallax barrier setting panel 121 has a liquid crystal between the substrates 21 and 23 in the region including the light transmission area 22A, in which the substrate 21 and the substrate 23 are bonded via the sealing seal 26. Is sealed.

  Although not shown in FIG. 4, the barrier control circuit 122 performs control to apply the above-described control voltage V1 to the stripe electrode E1 according to, for example, image data. In particular, in the present embodiment, when displaying a normal 2D image, the barrier control circuit 122 does not apply the control voltage V1 to the stripe electrode E1, and covers the entire light transmission area 22A including the stripe electrode E1. The white light (or any single color light) emitted from the display panel 111 is transmitted almost directly to the visual field side. On the other hand, when displaying a 3D image, the barrier control circuit 122 applies the control voltage V1 to the stripe electrode E1 and causes the parallax barrier setting panel 121 to function as a parallax barrier. Here, the control voltage V1 is set to a voltage signal whose polarity is inverted at a constant period in order to drive the liquid crystal with alternating current.

The principle of 3D image display using the parallax barrier setting unit 120 having such a configuration will be described below.
FIG. 6 is a conceptual diagram for explaining the display principle of a 3D image using the parallax barrier method applied to the present embodiment. In FIG. 6, the same components as those of the display device 100 described above will be described with the same reference numerals. Here, FIG. 6 shows the positional relationship between the display device 100 (the display panel 111 and the parallax barrier setting panel 121) and the user USR as viewed from above.

  As shown in FIG. 6, when displaying a 3D image on the display device 100, first, on the display panel 111 of the image display unit 110, the image information to be displayed is divided into a plurality along the column direction. The generated right-eye and left-eye image components (indicated by “R” and “L” in the drawing) are arranged so as to be alternately adjacent in the row direction (left-right direction in FIG. 6) and are displayed simultaneously. On the other hand, in the parallax barrier setting panel 121 of the parallax barrier setting unit 120, the control voltage V1 is applied to the stripe electrode E1 shown in FIG. 4, and the region along the stripe electrode E1 in the light transmission area 22A is shown in FIG. As shown in the figure, for example, a black line is displayed as the light shielding portion 121s, and a slit-like parallax barrier is formed. As a result, the right-eye and left-eye image components displayed on the display panel 111 are transmitted to the visual field side through the slit of the parallax barrier, and the right-eye image component “R” is visually recognized by the right eye of the user USR. The left eye image component “L” is visually recognized by the left eye. At this time, the image displayed on the display panel 111 passes through the parallax barrier formed by the parallax barrier setting panel 121 and is visually recognized by the user USR with a predetermined parallax. Is recognized as a stereoscopic image.

(Image display operation)
Next, an image display operation (drive control operation) and display example of image information in the display device 100 having the above-described configuration will be described with reference to the drawings.

  FIG. 7 is a conceptual diagram illustrating a display example of image information in the display device according to the present embodiment, and FIG. 8 is a display panel and parallax barrier setting when performing 3D image display in the display device according to the present embodiment. It is a conceptual diagram which shows the drive state of a panel. Here, in FIGS. 7A and 7B, a 2D display gradation image displayed on the display panel 111 and a 3D display gradation image based on the display principle described in FIG. In order to clarify that they are different from each other, each image component of “R” and “L” constituting the gradation image for 3D display is indicated by a stripe pattern for convenience (second implementation described later) Same in form). In FIG. 8, the display panel 111 indicates that light is emitted with different luminance gradations by using different dot hatching for the sake of convenience (the same applies to the second embodiment described later).

  In the above-described display device 100, when performing 2D image monochromatic display, as shown in FIG. 7A, in the display panel 111, each light-emitting pixel PIX emits white light with a luminance gradation based on image data. By performing (or any single color emission), the gradation image IMx is displayed. Further, in the parallax barrier setting panel 121, a state in which the control voltage V1 is not applied to the stripe electrode E1, that is, a state in which no voltage is applied to the liquid crystal layer 22, is set, as shown in FIG. The entire area of the light transmission area 22A including the electrode E1 is set in a transparent state. Thereby, white light (or any single color light) emitted from the display panel 111 passes through the light transmission area 22 </ b> A almost as it is and is emitted to the visual field side of the display device 100. Based on the emitted light, the monochromatic image IMa having a luminance gradation corresponding to the image data and having a single display color (white or any single color) is displayed in 2D on the display unit 10A of the display device 100. It is visually recognized by the user.

  When the display device 100 performs monochromatic display of a 3D image, as shown in FIG. 7B, in the display panel 111, each light emitting pixel PIX emits white light with a luminance gradation based on the image data. The gradation image IMy is displayed by (or any single color light emission). Here, as described above, when a 3D image is displayed, the 2D image based on the image data is divided into a plurality of image components along the column direction as shown in FIG. 3D floors are displayed by simultaneously arranging the image components (indicated by “R” and “L” in the figure) so as to be alternately adjacent to each other in the row direction (left and right direction in FIG. 8). A tone image IMy is generated. Further, in the parallax barrier setting panel 121, a state in which the control voltage V1 is applied to the stripe electrode E1, that is, a state in which a voltage is applied to the liquid crystal layer 22, is set, and thus along the stripe electrode E1 in the light transmission area 22A. A black line is displayed in the region to form the light shielding portion 121s, and a slit-like parallax barrier is formed. As a result, the right-eye and left-eye image components of the 3D gradation image IMy displayed on the display panel 111 are transmitted to the visual field side through the slit of the parallax barrier, and are displayed on the visual field side of the display device 100. Emitted. Then, based on the emitted light, the display unit 10A of the display device 100 has a luminance gradation corresponding to the image data and a single display color (white or any single color) having a predetermined parallax. The color image IMb is displayed and visually recognized as a 3D image by the user.

  As described above, according to the present embodiment, it is possible to realize a monocolor display type display capable of switching between display of 2D images and 3D images with a relatively simple configuration and control method.

<Second Embodiment>
Next, a second embodiment of the display device according to the present invention will be described with reference to the drawings. Here, about the structure equivalent to 1st Embodiment mentioned above, the same code | symbol is attached | subjected, the description is simplified, and the structure peculiar to this embodiment is demonstrated in detail.

  In the first embodiment described above, the gradation image displayed by causing the display panel 111 to emit light with white light or any single color light is transmitted through the parallax barrier setting panel 121, thereby allowing a 2D image or a 3D image to be displayed. The case where mono-color display is performed has been described. In the second embodiment, a 2D image display or a 3D image display with an arbitrary display color is performed by transmitting a gradation image obtained by causing the display panel 111 to emit white light through the parallax barrier setting panel 121. It is characterized by.

The display device according to the second embodiment includes an image display unit 110 and a parallax barrier setting unit 120, as in the first embodiment described above.
Similar to the first embodiment, the image display unit 110 includes a display panel 111 in which a plurality of light emitting pixels PIX are two-dimensionally arranged on a substrate, and each light emitting pixel emits light with a luminance gradation corresponding to image data. By doing so, a gradation image corresponding to the image data is displayed. Here, when a 3D image is displayed on the display device 100, as described above, a gradation image in which the images for the right eye and the left eye are combined is displayed on the display panel 111.

  Similar to the first embodiment (see FIG. 1A), the parallax barrier setting unit 120 includes a parallax barrier setting panel 121 that functions as a parallax barrier when displaying a 3D image on the display device 100, and the parallax. And a barrier control circuit 122 that drives and controls the barrier setting panel 121. Here, in the parallax barrier setting unit 120 according to the present embodiment, the parallax barrier setting panel 121 has a function of setting the display color of the image information when performing monocolor display in addition to the function as the parallax barrier described above. Have. Hereinafter, the parallax barrier setting unit 120 (particularly, the parallax barrier setting panel 121) will be described in detail.

(Parallax barrier setting unit)
FIG. 9 is a schematic configuration diagram illustrating an example of a parallax barrier setting panel applied to the display device according to the present embodiment. In FIG. 9, for the sake of clarity, the electrodes provided on the substrate and the sealing seal are hatched for the sake of convenience. FIG. 10 is a schematic plan view showing electrodes provided on each substrate constituting the parallax barrier setting panel shown in FIG. FIG. 10A is a schematic plan view showing the stripe electrode provided on the substrate 21 side, and FIG. 10B is a schematic plan view showing the common electrode provided on the substrate 23 side.

  As the parallax barrier setting panel 121, a transmissive liquid crystal display panel can be applied as in the above-described embodiment (see FIG. 1B), and between the transparent substrates 21 and 23 arranged facing each other. A liquid crystal layer 22 is provided. More specifically, as shown in FIGS. 9 and 10A, each of the light transmission areas 22A of the substrate 21 constituting the parallax barrier setting panel 121 extends in the vertical direction (column direction) in the drawing. A plurality of stripe electrodes E1 and E2 are arranged alternately and at equal intervals in the horizontal direction (row direction) in the drawing. That is, the stripe electrode E1 is arranged at a predetermined interval on the substrate 21 as in the first embodiment described above, and the stripe electrode (second electrode) E2 is provided in each gap between the stripe electrodes E1. Arranged at intervals. As shown in FIG. 9, the stripe electrode E1 is connected to a predetermined control voltage V1 via the connection terminal Ts1, and the stripe electrode E2 is connected to a predetermined control voltage (second voltage) via the connection terminal Ts2. Connected to V2. Here, the control voltages V1 and V2 are set to voltage signals whose polarities are inverted at a constant period in order to drive the liquid crystal with alternating current.

  On the other hand, as shown in FIGS. 9 and 10B, the substrate 23 facing the substrate 21 has a single common electrode at least over substantially the entire light transmission area 22A, as in the first embodiment described above. Ec is provided. As shown in FIG. 9, the common electrode Ec is connected to the ground potential via a lead wire Lrc provided on the substrate 21 side and connection terminals Tc1, Tc2. Here, also in this embodiment, the stripe electrodes E1 and E2 and the common electrode Ec are formed of a transparent electrode material such as ITO. In addition, the substrate 21 and the substrate 23 are bonded via a sealing seal 26, and the liquid crystal is sealed between the substrates 21 and 23 in a region including the light transmission area 22A.

  Although not shown in FIG. 9, the barrier control circuit 122 performs control to apply the individual control voltages V1 and V2 to the stripe electrodes E1 and E2 described above, for example, according to image data. In particular, in the present embodiment, the barrier control circuit 122 applies the control voltages V1 and V2 set to the same voltage value to the stripe electrodes E1 and E2 when displaying a normal 2D image, The parallax barrier setting panel 121 is caused to function as a display color setting element. As a result, light having a wavelength distribution corresponding to the image data is extracted from the white light emitted from the display panel 111 over the entire light transmission area 22A including the stripe electrodes E1 and E2 of the parallax barrier setting panel 121. Transparent to.

  On the other hand, when displaying the 3D image, the barrier control circuit 122 applies the control voltage V1 for setting the parallax barrier to the stripe electrode E1, for example, and sets the region corresponding to the stripe electrode E1 in the light transmission area 22A. A black line is displayed, and the parallax barrier setting panel 121 functions as a parallax barrier, and the display voltage setting control voltage V2 is applied to the stripe electrode E2, and the area corresponding to the stripe electrode E2 in the light transmission area 22A And function as a display color setting element for changing and setting the wavelength distribution of the light passing through. Here, the display principle of the 3D image using the parallax barrier setting panel 121 as the parallax barrier is as described in the first embodiment.

(Display color setting operation)
Here, the display color setting operation (transmission wavelength setting principle) using the parallax barrier setting panel 121 as a display color setting element in the parallax barrier setting unit 120 having the above-described configuration will be described below. Here, description will be made with reference to FIGS. 1 and 9 shown in the first embodiment as appropriate.

  When no voltage is applied between the stripe electrodes E1 and E2 provided on the substrates 21 and 23 of the parallax barrier setting panel 121 and the common electrode Ec facing each other, or a voltage lower than the threshold voltage of the liquid crystal layer 22 is applied. When applied, the parallax barrier setting panel 121 is set so that the entire light transmission area 22A including the stripe electrodes E1 and E2 is transparent. Here, the white light emitted from the display panel 111 of the image display unit 110 is first converted into linearly polarized light by the polarizing plate 24 and transmitted through the substrate 21, and then polarized according to the orientation of the liquid crystal molecules in the liquid crystal layer 22. In this state, the light further passes through the substrate 23 and the polarizing plate 25. Therefore, in this case, the white light emitted from the display panel 111 is transmitted through the polarizing plate 24, the substrate 21, the liquid crystal layer 22, the substrate 23, and the polarizing plate 25 in the light transmission area 22A almost as they are, thereby displaying the display device. The light is emitted to the 100 field of view.

  On the other hand, when the control voltages V1 and V2 (here, V1 = V2) set to voltage values higher than the threshold voltage of the liquid crystal layer 22 are applied between the stripe electrodes E1 and E2 and the common electrode Ec, The liquid crystal molecules are gradually aligned in the direction perpendicular to the substrates 21 and 23. Accordingly, the linearly polarized light that has been transmitted through the polarizing plate 24 and the substrate 21 and entered the liquid crystal layer 22 has its polarization state changed according to the alignment state of the liquid crystal molecules, and is sequentially transmitted through the substrate 23 and the polarizing plate 25. Thus, light having a specific wavelength and a specific intensity is emitted to the field of view.

  That is, by controlling the voltage applied to the liquid crystal layer 22, the wavelength distribution of the light transmitted through the parallax barrier setting panel 121 and emitted to the field of view is changed to substantially the entire light transmission area 22A (strictly speaking, the light transmission It can be controlled by the region corresponding to the stripe electrodes E1 and E2 in the area 22A). Accordingly, it is possible to arbitrarily control the display color of the image information based on the wavelength distribution of the light transmitted through the parallax barrier setting unit 120 and to allow the parallax barrier setting panel 121 to function as a display color setting element. .

The display color setting operation (transmission wavelength setting principle) in the present embodiment will be described in more detail.
FIG. 11 is a diagram for explaining the arrangement relationship between the polarizing plate and the liquid crystal layer in the parallax barrier setting unit according to the present embodiment. FIG. 12 is a diagram illustrating a relationship between the wavelength λ of the transmitted light and the transmittance I when the voltage applied to the liquid crystal layer is changed in the parallax barrier setting unit according to the present embodiment. FIG. 13 is a diagram illustrating an example of a wavelength distribution of white light emitted from an organic EL element provided in the display panel, and FIG. 14 is an application to a liquid crystal layer in the parallax barrier setting unit according to the present embodiment. It is a figure which shows the relationship between a voltage and the wavelength distribution of transmitted light.

As shown in FIG. 1, the transmittance I with respect to the wavelength λ of the light transmitted through the parallax barrier setting unit 120 having the panel structure in which the liquid crystal layer 22 is disposed between the polarizing plates 24 and 25 is expressed by the following equation (1) and It is represented by the formula (2).
I = I ₀ · {cos ² α-sin ² β · sin ² (β + α) · sin ² (π · Δn · d / λ)} (1)
Δn = d · {(ns ² −n 0 ² · sin ² θ) ^0.5 − (np ² −n0 ² · sin ² θ) ^0.5 } (2)

  Here, as shown in FIG. 11, α is an angle formed by the linearly polarized light transmitted by the two polarizing plates 24 and 25 (that is, the transmission axis 24ax of the polarizing plate 24 and the transmission axis 25ax of the polarizing plate 25 are formed. Angle). As shown in the first embodiment, the polarizing plate 24 is configured to be rotatable by applying a circular polarizing plate, whereby the angle α can be changed by adjusting the mounting angle. Β is an angle formed between the axis of linearly polarized light transmitted through the liquid crystal layer 22 and the phase advance axis 22ax (that is, the angle formed between the phase advance axis 22ax of the liquid crystal layer 22 and the transmission axis 25ax of the polarizing plate 25). . Further, d is the thickness of the liquid crystal layer 22, and Δn is a phase difference between the fast axis direction and the slow axis direction of the liquid crystal layer 22. ns, np, and n0 are the refractive indexes of the extraordinary light, ordinary light, and air of the liquid crystal layer 22, and θ is the tilt angle of the liquid crystal molecules.

  In the above equations (1) and (2), when the angles α and β are fixed at arbitrary angles, the change characteristic of the transmittance I shown in the above equation (1) with respect to the wavelength λ is the tilt angle θ of the liquid crystal molecules, That is, it depends on the voltage applied to the liquid crystal layer 22 that determines the alignment state of the liquid crystal molecules. For example, when homogeneous liquid crystal is applied to the liquid crystal layer 22 and the voltage applied to the liquid crystal layer 22 is changed, the wavelength λ (nm) of light transmitted through the parallax barrier setting unit 120 (parallax barrier setting panel 121) and transmission The relationship with the rate I is shown as in FIG. Here, the angle α shown in the equation (1) is set to π / 2 (= 90 °), and the angle β is set to π / 4 (= 45 °). As shown in FIG. 12, the wavelength distribution of light transmitted through the parallax barrier setting panel 121 can be changed by changing the voltage applied to the liquid crystal layer 22.

  More specifically, FIG. 13 shows an actual wavelength distribution of white light emitted from the organic EL elements OEL arranged on the display panel 111 of the image display unit 110. Further, when the applied voltage to the liquid crystal layer 22 is changed, the wavelength distribution of white light emitted from the organic EL element OEL shown in FIG. 13 is transmitted through the parallax barrier setting unit 120 (parallax barrier setting panel 121). The wavelength distribution of the light is shown as in FIG.

  As shown in FIG. 13, the white light emitted from the organic EL element OEL includes light in a wide range of wavelengths including blue light having a wavelength of about 450 nm, green light having a wavelength of about 520 nm, and red light having a wavelength of about 650 nm. Yes. Here, as shown in FIG. 12, the wavelength distribution of the light transmitted through the parallax barrier setting panel 121 can be changed by changing the voltage applied to the liquid crystal layer 22. Therefore, when white light from the display panel 111 enters the parallax barrier setting unit 120 (parallax barrier setting panel 121), as shown in FIG. 14, the transmitted voltage is set by setting the applied voltage to 0 V, for example. It can be set to white light, the transmitted voltage can be set to red light by setting the applied voltage to 1.8V, for example, and the transmission light can be set to 2.3V by setting the applied voltage to, for example, The light can be set to green light, and the transmitted light can be set to blue light by setting the applied voltage to 3.7 V, for example.

  Therefore, since the voltage applied to the liquid crystal layer 22 is controlled by arbitrarily setting the voltage values of the control voltages V1 and V2 applied to the stripe electrodes E1 and E2, the parallax barrier setting unit 120 (parallax barrier setting panel 121) By controlling the wavelength distribution of the light transmitted through the light, it is possible to display image information having a luminance gradation corresponding to the image data and having a predetermined display color.

  In particular, in the parallax barrier setting unit 120 (parallax barrier setting panel 121) according to the present embodiment, since the stripe electrodes E1 and E2 are connected to the individual control voltages V1 and V2 as described above, the stripe electrodes The voltage applied to E1 and E2 (that is, the voltage applied to the liquid crystal layer 22 in the region corresponding to each of the stripe electrodes E1 and E2) can be set individually.

  Therefore, in the display device 100 according to the present embodiment, when performing 2D image monochromatic display, the control voltages V1 and V2 set to the same and arbitrary voltage values are applied to the stripe electrodes E1 and E2. Thus, the wavelength distribution of the light emitted toward the field of view is controlled over the entire light transmission area 22A including the stripe electrodes E1 and E2, and a 2D image corresponding to the image data is displayed in a predetermined display color (2D mono Color display).

  On the other hand, in the display device 100 according to the present embodiment, when mono-color display of a 3D image is performed, control voltages V1 and V2 set to individual voltage values are applied to the stripe electrodes E1 and E2, respectively. To do. That is, for example, by applying the parallax barrier setting control voltage V1 to the stripe electrode E1, a region corresponding to the stripe electrode E1 in the light transmission area 22A is displayed as a black line and functions as a parallax barrier. Further, for example, by applying a display voltage setting control voltage V2 to the stripe electrode E2, a region corresponding to the stripe electrode E2 in the light transmission area 22A (a region between black line displays corresponding to the stripe electrode E1). The wavelength distribution of the light that passes through is controlled to function as a display color setting element. As a result, a 3D image corresponding to the image data can be displayed in a predetermined display color (3D monocolor display). Specific display examples of these image information will be described later.

  In the verification of the wavelength distribution of the transmitted light, the case where the homogeneous liquid crystal is applied to the liquid crystal layer 22 has been described. However, the present invention is not limited to this. That is, the present invention may be applied to other liquid crystals such as IPS (in-plane switching) liquid crystal, TN liquid crystal, and STN liquid crystal.

(Image display operation)
Next, an image display operation (drive control operation) and display example of image information in the display device 100 having the above-described configuration will be described with reference to the drawings.

  FIG. 15 is a conceptual diagram illustrating a display example when a 2D image is monochromatically displayed in the display device according to the present embodiment, and FIG. 16 is a diagram when 2D image display is performed in the display device according to the present embodiment. It is a conceptual diagram which shows the drive state of this display panel and a parallax barrier setting panel. FIG. 17 is a conceptual diagram illustrating a display example when a 3D image is monochromatically displayed in the display device according to the present embodiment. FIG. 18 is a diagram illustrating 3D image display in the display device according to the present embodiment. It is a conceptual diagram which shows the drive state of the display panel and parallax barrier setting panel at the time of performing. FIG. 19 is a conceptual diagram showing a display example when 2D images are displayed in area color in the display device according to the present embodiment, and FIG. 20 is a diagram showing 3D images in the display device according to the present embodiment. It is a conceptual diagram which shows the example of a display at the time of performing color display. 15 to 20, the display panel 111 indicates that the display panel 111 emits light with different luminance gradations by different dot hatching, and the parallax barrier setting panel 121 displays light having different wavelength distributions. The fact that the transmission state is set is indicated by different line hatching.

  In the above-described display device 100, when performing monochromatic display of a 2D image, as shown in FIGS. 15A and 15B and FIG. 16, the display panel 111 has a luminance scale based on image data. Each light emitting pixel PIX emits white light in a tone, so that a gradation image IMx is displayed. In the parallax barrier setting panel 121, the stripe electrodes E1 and E2 are set to a state in which the display voltage setting control voltages V1 and V2 set to the same voltage value are applied to the stripe electrodes E1 and E2. It is set in a state where light having a specific wavelength distribution is transmitted through the entire light transmission area 22A. As a result, only the light having a wavelength distribution corresponding to a predetermined display color corresponding to the image data from the white light emitted from the display panel 111 is transmitted through the parallax barrier setting panel 121 to the visual field side of the display device 100. Emitted. Then, based on the emitted light, as shown in FIG. 15A or 15B and FIG. 16, the display unit 10A of the display device 100 has a luminance gradation according to the image data and a predetermined level. A monocolor image IMc composed of display colors is displayed in 2D and visually recognized by the user.

  When the display device 100 performs monocolor display of a 3D image, as shown in FIGS. 17A and 17B and FIG. 18, the display panel 111 has a luminance scale based on the image data. Each light emitting pixel PIX emits white light in a tone, so that a gradation image IMy is displayed. Here, as in the first embodiment, when displaying a 3D image, as shown in FIG. 18, the 2D image based on the image data is divided into a plurality of image components along the column direction, and the right eye By arranging each image component (indicated by “R” and “L” in the figure) corrected for the left eye or the left eye so as to be alternately adjacent to each other in the row direction (left and right direction in FIG. 18), A 3D gradation image IMy is generated. Further, in the parallax barrier setting panel 121, as shown in FIG. 18, the parallax barrier setting control voltage V1 is applied to the stripe electrode E1, thereby setting the stripe electrode E1 along the stripe electrode E1 in the light transmission area 22A. In this area, a black line is displayed as the light shielding part 121s, and a slit-like parallax barrier is formed. Further, in the parallax barrier setting panel 121, as shown in FIG. 18, the display color setting control voltage V2 is applied to the stripe electrode E2, thereby setting the stripe electrode E2 along the stripe electrode E2 in the light transmission area 22A. The region (that is, the region between the black line displays corresponding to the stripe electrode E1) is set to a state where light having a specific wavelength distribution is transmitted. Accordingly, light having a wavelength distribution corresponding to a predetermined display color corresponding to image data from white light having image components for the right eye and left eye of the 3D gradation image IMy displayed on the display panel 111. Only the light passes through the slit of the parallax barrier to the visual field side and is emitted to the visual field side of the display device 100. Then, based on the emitted light, as shown in FIG. 17 (a) or (b) and FIG. 18, the display unit 10A of the display device 100 has a luminance gradation according to the image data and a predetermined level. A monocolor image IMe having a display color and having a predetermined parallax is displayed and visually recognized as a 3D image by the user.

  By the way, in the monochromatic display operation of the 2D image according to the present embodiment, as shown in FIG. 15, light having a single wavelength distribution is transmitted over the entire light transmission area 22A of the parallax barrier setting panel 121. The case where the monochromatic image IMc having a single display color is displayed in 2D on the display unit 10A of the display device 100 has been described. The present invention is not limited to this display example. For example, as shown in FIG. 19, the light transmission area 22A of the parallax barrier setting panel 121 is divided into a plurality of areas, and light having a different wavelength distribution is obtained for each area. The gradation image IMz displayed on the display panel 111 so as to be transparent is displayed on the display unit 10A of the display device 100 as an area color display in 2D as a monocolor image IMd having different display colors for each region. It may be. Alternatively, a part of the gradation image displayed on the display panel 111 is transmitted to a specific area in the light transmission area 22A of the parallax barrier setting panel 121 so that light having a specific wavelength distribution is transmitted. The display unit 10A may perform area color display for 2D display as a monocolor image having different display colors.

  Further, in the monochromatic display operation of the 3D image according to the present embodiment, as shown in FIG. The case where the monochromatic image IMe consisting of a single display color is displayed in 3D on the display unit 10A of the display device 100 by transmitting light having the above has been described. The present invention is not limited to this display example. For example, as shown in FIG. 20, the light transmission area 22A of the parallax barrier setting panel 121 is divided into a plurality of areas, and light having a different wavelength distribution is obtained for each area. The color image IMv displayed on the display panel 111 is displayed on the display unit 10A of the display device 100 as a monocolor image IMf having different display colors for area color display. It may be. Alternatively, a part of the gradation image displayed on the display panel 111 is different from the display unit 10 </ b> A of the display device 100 by transmitting light having a specific wavelength distribution in a specific region in the light transmission area 22 </ b> A. An area color display for 3D display as a monocolor image composed of display colors may be performed.

  In order to realize the area color display of the 2D image as shown in FIG. 19 and the area color display of the 3D image as shown in FIG. 20, the light transmission area 22A of the parallax barrier setting panel 121 is divided. In each region (or in a specific region in the light transmission area 22A), stripe electrodes E1 and E2 having a structure as shown in FIG. 9 are individually provided and applied to the stripe electrodes E1 and E2 in each region. Although it is necessary to provide the barrier control circuit 122 that individually controls the voltage, according to the display device 100 having such a configuration, a display method is set for each arbitrary region, and a 2D image and a 3D image are mixed. A wide variety of image displays can be realized.

  As described above, according to the present embodiment, it is possible to realize a monocolor display method or an area color display method display that can switch between the display of 2D images and 3D images with a relatively simple configuration and control method. Can do.

  In the present embodiment, the display color of the image information can be arbitrarily set by controlling the voltage applied to the parallax barrier setting panel 121. According to this, an arbitrary display color can be set in the entire display area or in an arbitrary area with a simple configuration and control method.

  In the present embodiment, an organic EL display panel that emits white light can be applied as the display panel 111. According to this, since a light emitting layer (organic EL layer) can be formed on a substrate using a light emitting material (organic material) of a single color, a process of separately coating the light emitting material corresponding to the light emitting color for each pixel. Do not need. Therefore, it is possible to realize a mono-color display method or an area color display-type display that has a simple panel structure, can reduce manufacturing costs, and can improve manufacturing yield. In addition, since a light-emitting layer is formed using a single light-emitting material, color shifts and luminance changes due to differences in light-emitting characteristics over time (life) caused by the material are unlikely to occur, and a display with a long product life is realized. can do.

  In each of the above-described embodiments, as the display panel 111 of the image display unit 110, an organic EL element OEL (light emitting layer 12) in which an organic EL layer is provided between a pair of electrodes is provided between the substrates 11 and 13. Only the panel structure formed is shown. The present invention is not limited to this, and may have, for example, a tandem structure (or stack structure) in which a plurality of organic EL elements are stacked between the substrates 11 and 13. Luminous efficiency (current efficiency) can be improved by applying such an organic EL element having a tandem structure. In the present invention, a dot matrix type liquid crystal display panel having a backlight, an inorganic EL display panel, or the like is applied as the display panel 111 of the image display unit 110 instead of the organic EL display panel described above. There may be.

<Electronic equipment>
Next, an example of an electronic apparatus to which the display device according to the above-described embodiment is applied will be described with reference to the drawings.

  As shown in the embodiment described above, the image display unit 110 in which the light emitting pixels PIX having the organic EL elements OEL are two-dimensionally arranged, and the parallax barrier setting unit 120 that controls the display state of the 2D image and the 3D image are provided. The display device 100 provided can be favorably applied as a display device for various electronic devices such as a digital camera, a mobile phone, digital audio, an electronic dictionary, a vehicle speedometer, and an advertising display.

FIG. 21 is a perspective view illustrating a configuration example of a digital camera to which the display device according to the present invention is applied, and FIG. 22 is a diagram illustrating a configuration example of a mobile phone to which the display device according to the present invention is applied.
In FIG. 21, the digital camera 210 roughly includes a main body 211, a lens unit 212, an operation unit 213, a display unit 214, and a shutter button 215. Here, the display unit 214 includes an icon display unit 214a, and a configuration equivalent to that of the display device 100 described in each embodiment described above is applied. According to this, since the 2D image and 3D image can be displayed in an arbitrary display color with a simple configuration and control method in the icon display unit 214a, the product quality and reliability are high, and the image display is diverse. A digital camera 210 with high visibility can be provided.

  In FIG. 22, the mobile phone 220 is roughly divided into an operation unit 221, an earpiece 222, a mouthpiece 223, a main display unit 224, a sub display unit 225, and a camera lens unit 226. Yes. Here, the main display unit 224 includes an icon display unit and an information display unit 224a. As the information display unit 224a and the sub display unit 225, a configuration equivalent to that of the display device 100 described in each of the above embodiments is applied. Yes. Even in this case, the information display unit 224a and the sub display unit 225 can display a 2D image or a 3D image in an arbitrary display color with a simple configuration and control method, so that the product quality and reliability are high. A mobile phone 220 with various image displays and high visibility can be provided.

DESCRIPTION OF SYMBOLS 10A Display part 11, 13, 21, 23 Substrate 12 Light emitting layer 12A Display area 22 Liquid crystal layer 24, 25 Polarizing plate 100 Display device 110 Image display part 111 Display panel 112 Display drive control circuit 120 Parallax barrier setting part 121 Parallax barrier setting panel 121s light-shielding part 122 barrier control circuit PIX light-emitting pixel OEL organic EL element E1, E2 stripe electrode Ec common electrode

Claims (11)

A plurality of light-emitting pixels that emit predetermined monochromatic light, and an image display unit including a display panel that displays a gradation image by causing each of the light-emitting pixels to emit light at a luminance gradation according to image data;
A parallax barrier setting panel that is arranged on a side from which light emitted from each light emitting pixel of the display panel is emitted and forms a parallax barrier composed of light-shielding portions arranged at equal intervals by applying a first voltage. A parallax barrier setting unit comprising:
A display device comprising: The parallax barrier setting panel includes transparent first electrodes that are arranged at equal intervals between substrates disposed opposite to each other, a transparent common electrode that faces the first electrodes in common, and the first electrodes A liquid crystal layer having a liquid crystal molecule sealed between one electrode and the common electrode,
The first electrode is arranged by changing the alignment state of the liquid crystal molecules by applying the first voltage for setting a parallax barrier between the first electrode and the common electrode. The display device according to claim 1, wherein the light shielding portion is formed in a region. The parallax barrier setting unit includes a polarizing plate outside the parallax barrier setting panel,
The parallax barrier setting panel includes transparent first electrodes arranged at equal intervals between substrates arranged opposite to each other, and transparent second electrodes arranged in gaps between the first electrodes. A transparent common electrode facing the first electrode and the second electrode in common, and liquid crystal molecules sealed between the first electrode, the second electrode, and the common electrode; A liquid crystal layer having
The first electrode is arranged by changing the alignment state of the liquid crystal molecules by applying the first voltage for setting a parallax barrier between the first electrode and the common electrode. Forming the light-shielding portion in the region,
A region where the second electrodes are arranged by applying a second voltage for setting a display color between the second electrode and the common electrode to change the alignment state of the liquid crystal molecules. The display device according to claim 1, wherein a wavelength distribution of light transmitted through the polarizing plate and the parallax barrier setting panel is set.   By setting the first voltage applied between the first electrode and the common electrode to the same voltage value as the second voltage, and changing the alignment state of the liquid crystal molecules, 4. The display device according to claim 3, wherein a wavelength distribution of light transmitted through the polarizing plate and the parallax barrier setting panel is set in a region where the first electrodes are arranged.   In the parallax barrier setting panel, a light transmission region through which the monochromatic light emitted from the display panel is transmitted is divided into a plurality of regions, and each of the divided regions includes the first electrode and the second electrode. 5. The display device according to claim 3, wherein the display device is provided separately, and the first voltage and the second voltage are individually applied to each of the divided regions.   6. The display device according to claim 1, wherein an organic electroluminescence element is applied to the light emitting pixel as a light emitting element that emits the monochromatic light.   An electronic apparatus comprising the display device according to claim 1 mounted thereon. Displaying a gradation image on a display panel by causing a plurality of light emitting pixels to emit light in a single color with a luminance gradation corresponding to the image data,
By applying a first voltage to the transparent first electrodes arranged at equal intervals on the parallax barrier setting panel arranged on the side where the light emitted from each light emitting pixel of the display panel is emitted, Drive control of a display device, wherein a light-shielding portion is formed in a region where the first electrodes are arranged, and the gradation image is displayed as a stereoscopic image by passing through a parallax barrier composed of the light-shielding portion. Method.   The second electrode is arranged by applying a second voltage to the transparent second electrodes arranged in the gaps of the first electrodes arranged at equal intervals on the parallax barrier setting panel. By setting the wavelength distribution of the light that passes through the parallax barrier setting panel in the region, and transmitting the gradation image through the parallax barrier setting panel, the stereoscopic image is displayed in a predetermined display color according to the image data. 9. The display device drive control method according to claim 8, wherein display is performed.   The first voltage applied to the first electrode is set to the same voltage value as the second voltage, and the region where the first electrode is arranged and the second electrode are arranged. By setting a wavelength distribution of light that passes through the parallax barrier setting panel in the region, and transmitting the grayscale image through the parallax barrier setting panel, the grayscale image is displayed in a predetermined display color according to the image data. The display control method for a display device according to claim 9, wherein the display control method is used.   The first voltage and the second voltage are applied to the first electrode and the second electrode in an arbitrary region of the parallax barrier setting panel, and the image data is applied to the arbitrary region according to the image data The display device drive control method according to claim 9 or 10, wherein the gradation image or the stereoscopic image is displayed in a predetermined display color.

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