JP2005181831A - Display device and method for controlling display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of accurately controlling a display panel in accordance with a display area and displaying an image with an accurate amount of light in the display device where the display panel is controlled by optical addressing. <P>SOLUTION: The display device is provided with: a display panel 110; an optical system 120 for control light; scanning position detection parts 132, 134 for detecting that control light L is scanning the display area AR2 of the display panel 110; and a control part 130 provided with a scanning speed operation part for calculating the scanning speed of the control light L in each pixel. The control part 130 controls the optical system 120 for the control light L in accordance with an image signal only when the control light L is scanning the display area AR2 on the basis of the detection result from the scanning position detection parts 132, 134, and corrects, on the basis of the calculated scanning speed, the amount of the control light L modulated in accordance with the image signal so that a prescribed pixel exhibits a required gradation level. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device and a method for controlling the display device, and more particularly to a technology of a display device using a display panel that can be controlled by scanning light.

  Conventionally, a display device that displays an image by scanning a screen with laser light modulated in accordance with an image signal has been proposed. As a technique of a display device that displays an image by scanning a laser beam, for example, there is one proposed in Patent Document 1.

JP 2003-98601 A

  Here, in a display device that electrically accesses each pixel, it is considered that the display panel is controlled by scanning control light instead of electrical access. As a display device that is electrically accessed, for example, there is a display device that includes electroluminescence that emits light by current (hereinafter referred to as “EL”) or a display panel that uses liquid crystal that transmits or reflects illumination light depending on voltage. For example, if a display panel using EL is controllable with control light, the display panel can be controlled by scanning the display panel with control light according to an image signal. If the display panel can be controlled using control light regardless of electrical access, electrical wiring or the like for each pixel becomes unnecessary. For this reason, if the display panel can be controlled by the control light, the display panel can have a simple configuration. Control of the display panel by scanning the control light is hereinafter referred to as control by optical addressing.

  For example, the control light can be scanned in a two-dimensional direction by rotating a galvanometer mirror, as in the technique proposed in Patent Document 1 above. In order to scan the control light with a compact configuration, it is desirable to shorten the distance from the galvanometer mirror to the display panel. On the other hand, if the distance from the galvanometer mirror to the display panel is shortened, it is necessary to increase the angular range in which the galvanometer mirror is rotated in order to scan the entire area of the display panel with the control light. The galvanometer mirror rotates at high speed according to the image signal. The galvano mirror is rotated at a high speed and in a large angle range, and thus a burden is increased. Considering such a burden on the galvanometer mirror, it is desirable to reduce the angle range in which the galvanometer mirror rotates. In order to reduce the angle range in which the galvanometer mirror rotates, it is necessary to increase the spatial distance between the galvanometer mirror and the display panel, resulting in a large apparatus. In particular, when laser light is scanned in the casing, the depth of the casing when the display panel is in front is increased.

  For these problems, it is conceivable that the control light is incident on the display panel so as to have a tilt angle from an oblique direction. When the control light is incident from an oblique direction, the optical path from the galvanometer mirror to the display panel becomes longer than when the control light is incident on the display panel from a substantially vertical direction. Further, when the control light is incident from an oblique direction, the housing can be made thinner than when the control light is incident from a direction substantially perpendicular to the display panel.

  Let us consider scanning the control light in the same angle range as when the control light is incident on the display panel from an oblique direction when the control light is incident from a direction substantially perpendicular to the display panel. At this time, even when the control light is scanned onto a display panel having a substantially rectangular area, the scanning area of the control light does not become substantially rectangular, and widens as the position becomes farther from the position of the galvanometer mirror. It will be like a trapezoid. It can be considered that the control light can be incident on the substantially rectangular area of the display panel by adjusting the angle range in which the galvano mirror rotates so that the scanning area of the control light has a substantially rectangular shape. However, adjusting the angle range in which the galvanometer mirror rotates in accordance with the area of the display panel causes a large burden on the driving of the galvanometer mirror. Furthermore, the scanning speed of the control light increases as the position becomes farther from the position where the control light is scanned. As the scanning speed of the control light increases, the control light is dispersed over a wide area. When a difference occurs in the region where the control light is dispersed in this way, for example, even when the amount of the control light is made substantially constant, uneven brightness occurs. When uneven brightness occurs in the control light, uneven brightness also occurs in the display image. Such uneven brightness of the display image has nothing to do with the change in the image signal.

  As described above, when the control light is incident on the display panel from the oblique direction with the tilt angle, it is difficult to accurately control the display panel corresponding to the display area and display with the correct light amount. Problem arises. The present invention has been made in view of the above-described problems, and in a display device that controls a display panel by optical addressing, the display panel can be accurately controlled corresponding to the display area and can be displayed with an accurate light amount. An object of the present invention is to provide a display device and a control method for the display device.

  In order to solve the above-described problems and achieve the object, according to the present invention, a conductivity variable layer whose electrical conductivity changes according to the amount of control light is provided, and the conductivity is changed for each of a plurality of pixels. A display panel that displays an image by applying a corresponding current or voltage, a power source for applying a current or voltage to the display panel, and scanning a control light in a scanning area larger than the display area of the display panel A control light optical system for supplying control light to the display panel, a scanning position detection unit for detecting that the control light scans the display area of the display panel, and a detection result from the scanning position detection unit. A scanning speed calculation unit that calculates the scanning speed of the control light in each pixel, and a control unit that controls the optical system for the control light so as to modulate the light amount of the control light in accordance with the image signal. Is the scanning position detector Based on the detection result, the control light optical system is controlled in accordance with the image signal only when the control light scans the display area, and the control unit further controls the desired gradation for the predetermined pixel. It is possible to provide a display device that corrects the amount of control light modulated in accordance with an image signal based on the calculated scanning speed so as to achieve a level.

  According to the present invention, the scanning position detector detects that the control light is scanning the display area of the display panel. The control unit controls the control light optical system according to the image signal only when the control light scans the display area based on the detection result from the scanning position detection unit. The control light optical system supplies control light modulated according to the image signal only in the display area. In this case, if there is a display area in the scanning area, the control light modulated in accordance with the image signal is supplied only to the display area of the display panel even if the shape of the scanning area does not match the shape of the display area. The Even when the scanning area of the control light is trapezoidal, the control light can be supplied to the position of the substantially rectangular display area. The control unit can synchronize the timing at which the control light scans each pixel with the timing clock of the image signal based on the detection result from the scanning position detection unit. In this way, the control light optical system can be controlled in accordance with the image signal only when the control light scans the display area. Since it is only necessary to adjust the timing clock of the image signal based on the detection result from the scanning position detection unit, for example, compared with the case where the angle range in which the galvanometer mirror rotates is easily adjusted within the display area. Control light can be supplied.

  Further, according to the present invention, the scanning speed calculation unit calculates the scanning speed of the control light in each pixel based on the detection result by the scanning position detection unit. Then, the control unit corrects the amount of control light modulated according to the image signal based on the calculated scanning speed so that a predetermined gradation level is obtained for a predetermined pixel. For example, in a region where the scanning speed of the control light is high, the control unit performs correction for adding the current value. When the current values are added, the control light optical system supplies a larger amount of control light that is modulated in accordance with the image signal. By increasing the amount of control light, the brightness of the pixels in that region can be improved to a desired gradation level.

  In the region where the scanning speed of the control light is low, the control unit performs correction for subtracting the current value. When the current value is subtracted, the control light optical system supplies less control light that is modulated in accordance with the image signal. By reducing the amount of control light, the brightness of the pixels in that region can be reduced to a desired gradation level. In this way, a predetermined pixel is set to a predetermined gradation level. Since a predetermined pixel is set to a desired gradation level, accurate display can be performed corresponding to the image signal. Thereby, in the display device that controls the display panel by optical addressing, a display device that can accurately control the display panel corresponding to the display area and can display with an accurate light amount can be obtained.

  According to a preferred aspect of the present invention, it is desirable that the display panel has an EL layer that emits light with a current corresponding to the conductivity. When control light is incident on the conductivity variable layer, the display panel emits light according to the amount of control light. By scanning only the display area of the display panel with the control light corresponding to the image signal, the display area of the display panel can be accurately emitted. Further, the display panel can be made to emit light with an accurate light amount by correcting the light amount of the control light modulated in accordance with the image signal so as to obtain a desired gradation level for a predetermined pixel. As a result, it is possible to obtain a display device that can accurately emit light in the display area of the display panel and display it with an accurate light amount.

  Moreover, according to the preferable aspect of this invention, it has the light source for illumination light which supplies illumination light, a display panel has a drive part driven by applying the voltage according to electrical conductivity, and a drive part is It is desirable to drive the illumination light so that it is transmitted or reflected. When the control light is incident on the variable conductivity layer, the display panel is driven according to the amount of the control light. The drive unit transmits or reflects illumination light according to the amount of control light. In the display device, the drive unit displays an image by transmitting or reflecting illumination light in accordance with the amount of control light. By driving the control light corresponding to the image signal only to the display area of the display panel, the drive unit can be driven accurately. By accurately driving the drive unit, it is possible to accurately transmit or reflect illumination light. Further, an image can be displayed with an accurate light amount by correcting the light amount of the control light modulated in accordance with the image signal so as to obtain a desired gradation level for a predetermined pixel. Thereby, the display apparatus which can transmit or reflect illumination light correctly and can display with an exact light quantity can be obtained.

  Moreover, as a preferable aspect of the present invention, it is desirable that the scanning position detector is an optical sensor. By using the optical sensor, the control light for scanning the position of the optical sensor can be accurately detected. Thereby, it is possible to accurately detect that the control light is scanning the display area of the display panel.

  Moreover, as a preferable aspect of the present invention, the control light optical system rotates about a predetermined two axes to be in a first direction and a second direction substantially orthogonal to the first direction. The display panel includes a scanning unit that scans the control light, and the display panel includes a substantially rectangular display region having sides substantially parallel to the first direction and sides substantially parallel to the second direction, and an outer edge of the display region. The scanning unit scans the control light in the first direction and then scans in the first direction at a predetermined spatial interval in the second direction. By repeating this, the control light is scanned in the display area and the non-display area, the optical sensors are the first optical sensor and the second optical sensor, and the first optical sensor is Provided on the optical path of the control light incident on the non-display area near one side of the display area substantially parallel to the second direction; Sa is preferably provided on the optical path of control light incident on the non-display area in the vicinity of another side of the display region facing the one side.

  The first optical sensor and the second optical sensor are provided at positions corresponding to the vicinity of the sides of the display area of the display panel. For this reason, the first optical sensor and the second optical sensor detect the control light when entering the display area from the non-display area and the control light when entering the non-display area from the display area. Thereby, it can be detected that the control light is scanning the display area of the display panel.

  Further, as a preferred aspect of the present invention, it is desirable that the control unit controls the control light optical system so as to scan the non-display area of the display panel with a substantially constant amount of control light. When the control light scans the non-display area, the control light can be set to a substantially constant light amount that is not related to the image signal. By scanning the control light on the non-display area of the display panel, it is possible to cause the optical sensor provided corresponding to the non-display area to detect the control light. Thereby, it can be detected that the control light is scanning the display area of the display panel. Further, if the light amount of the control light is made substantially constant when scanning the non-display area, a period in which the light amount of the control light becomes substantially constant at a constant frequency is provided during operation of the display device. By monitoring and feeding back the amount of control light at this time, it is possible to control the output amount of the control light from the control light optical system to be constant.

  Moreover, as a preferable aspect of the present invention, the display panel includes a display area and a non-display area provided at an outer edge of the display area, and the scanning position detection unit includes a voltage detection electrode that detects a voltage, A voltage detection unit that detects a voltage applied to the voltage detection electrode, and the voltage detection electrode is provided in the non-display area on the side opposite to the side on which the control light is incident, and in the conductivity variable layer. It is desirable that they are provided in contact with each other. When the control light is scanned on the conductivity variable layer in the non-display area, a voltage corresponding to the conductivity of the conductivity variable layer is applied to the voltage detection electrode. If the voltage applied to the voltage detection electrode is configured to be detected by the voltage detection unit, the control light for scanning the position of the non-display area where the voltage detection electrode is provided can be accurately detected.

  When the control light scans the non-display area, the control light can be set to a substantially constant light amount that is not related to the image signal. By scanning the control light in the non-display area of the display panel, the voltage detection unit can detect the voltage applied to the voltage detection electrode provided corresponding to the non-display area. Thereby, the voltage detection part can detect that the control light is scanning the inside of the display area of a display panel. If the amount of control light is substantially constant when the control light scans the non-display area, a period in which the amount of control light becomes substantially constant at a certain frequency is provided during operation of the display device. By monitoring and feeding back the amount of control light during the period when the control light scans the non-display area, it is possible to control the output amount of the control light from the control light optical system to be constant.

  Further, as a preferred aspect of the present invention, the control light optical system reciprocates around a predetermined two axes and rotates to thereby rotate the second direction substantially orthogonal to the first direction. The display panel has a substantially rectangular display region having sides substantially parallel to the first direction and sides substantially parallel to the second direction, and a display panel. And a non-display area provided at an outer edge of the area. The scanning unit scans the control light in the first direction, and then scans the control light in the second direction with a predetermined spatial interval in the first direction. By repeating the scanning to the display area, the control light is scanned in the display area and the non-display area, and the scanning speed calculator scans each pixel in accordance with the position of the control light in the second direction. It is desirable to calculate the speed.

  For example, consider a case where control light is incident on the approximate center position of the display panel with a tilt angle from a position below the normal line at the approximate center position of the display panel. The control light scans in the horizontal direction, which is the first direction, and then scans again in the horizontal direction at a predetermined spatial interval in the vertical direction, which is the second direction. When the control light is incident on the display panel from an oblique direction, the scanning speed of the control light in the region corresponding to one pixel increases as the position becomes farther from the position of the scanning unit. In this case, the incident position of the control light becomes a position farther from the scanning unit as it goes to the upper side of the display panel. The scanning speed of the control light in the horizontal direction increases as the scanning position of the control light goes upward. In addition, the incident position of the control light is closer to the scanning unit as it goes to the lower side of the display panel. The scanning speed of the control light in the horizontal direction decreases as the scanning position of the control light goes downward. Thus, the scanning speed of the control light in the first direction varies depending on the position in the second direction.

  The scanning speed calculation unit calculates the scanning speed in each pixel corresponding to the position of the control light in the second direction. The scanning speed calculation unit can obtain data related to the position of the control light in the second direction from the detection result of the scanning position detection unit. For example, the time during which the control light scans in the first direction from one end to the other end of the display area varies depending on the position of the control light in the second direction. This time can be detected by using, for example, a first optical sensor and a second optical sensor. The scanning speed calculation unit can obtain data relating to the position of the control light in the second direction from the time during which the control light scans the display area in the first direction.

  For example, the scanning speed of each pixel calculated by the scanning speed calculation unit becomes larger as the scanning position of the control light obtained from the detection result of the scanning position detection section is higher on the display panel. On the contrary, the scanning speed becomes smaller as the scanning position of the control light obtained from the detection result of the scanning position detector is lower on the display panel. Thus, by calculating the scanning speed at each pixel corresponding to the position of the control light in the up-down direction as the second direction, the scanning speed at each pixel can be calculated easily and accurately.

  Moreover, as a preferable aspect of the present invention, it is desirable that the scanning speed calculation unit further calculates the scanning speed in each pixel corresponding to the position of the control light in the first direction. The scanning unit repeatedly scans the control light in the first direction and then scans in the first direction again at a predetermined spatial interval in the second direction. When the scanning unit reciprocally rotates in this way, the scanning speed of the control light when scanning the central portion of the display area is scanned when the control light is scanned in the first direction. It becomes larger than the scanning speed. At this time, while the control light scans in the first direction, the closer to the center position in the first direction, the higher the scanning speed of the control light. Further, the closer to both ends in the first direction, the lower the scanning speed of the control light. Thus, the scanning speed of the control light in the first direction varies depending on the position in the first direction.

  The scanning speed calculation unit calculates the scanning speed in each pixel corresponding to the position of the control light in the first direction. The scanning speed at each pixel calculated by the scanning speed calculator is larger as the scanning position of the control light is closer to the center of the display panel. On the contrary, the scanning speed becomes smaller as the scanning position of the control light is closer to the both ends of the display panel. Thus, by calculating the scanning speed at each pixel corresponding to the position of the control light in the first direction, the scanning speed at each pixel can be calculated easily and accurately.

  As a preferred aspect of the present invention, it is desirable that the scanning speed calculation unit calculates the scanning speed at each pixel by using an interpolation value calculated from the detection result by the scanning position detection unit. The scanning unit repeatedly scans the control light in the first direction and then scans in the first direction at a predetermined spatial interval in the second direction. The scanning unit reciprocally rotates to scan the control light repeatedly in the first direction. If the angular range in which the scanning unit rotates is substantially constant, the relationship between the angular position of the scanning unit and time can be expressed by a sine function. The relationship between the position of the control light in the first direction and time is obtained from this sine function.

  The scanning speed calculation unit calculates the scanning speed of the control light in each pixel by using an interpolation value calculated from the detection result by the scanning position detection unit. From the detection result of the scanning position detector and the sine function, the relationship between the scanning position of the control light in the display area of the display panel and time can be obtained. From the relationship between the scanning position of the control light and the time, the time during which the control light scans each pixel arranged in parallel in the first direction is obtained as an interpolation value. If the length of each pixel is divided by the time for which the control light scans the pixel, the scanning speed for each pixel can be obtained. In this way, the scanning speed calculation unit calculates the scanning speed of the control light in the first direction in each pixel as the interpolation value. The scanning speed calculation unit can obtain the scanning speed of each pixel from the detection result of the scanning position detection unit. Thereby, the scanning speed in each pixel can be calculated easily and accurately.

  Furthermore, according to the present invention, a variable conductivity layer whose electrical conductivity changes according to the amount of control light is provided, and an image is generated by applying a current or voltage corresponding to the conductivity to each of a plurality of pixels. And a control light supply step of supplying the control light to the display panel by scanning the control light in a scanning area larger than the display area of the display panel. A scanning position detecting step for detecting that the display area of the display panel is scanned, a scanning speed calculating step for calculating the scanning speed of the control light in each pixel based on the detection result in the scanning position detecting step, And a light amount modulation step for modulating the light amount of the control light in the control light supply step according to the image signal. In the light amount modulation step, control is performed based on the detection result in the scanning position detection step. Only when the display area is scanned, the light amount of the control light is modulated in accordance with the image signal, and further, in the light amount modulation step, the image signal is converted into a desired gradation level for a predetermined pixel. Accordingly, it is possible to provide a control method for a display device, in which the amount of control light that is modulated in response is corrected based on the calculated scanning speed.

  In the scanning position detecting step, it is detected that the control light is scanning the display area of the display panel. Further, in the light amount modulation step, the control light is modulated in accordance with the image signal only when the control light is scanning the display area based on the detection result in the scanning position detection step. The control light optical system supplies control light modulated according to the image signal only in the display area. Further, in the scanning speed calculation process, the scanning speed of the control light in each pixel is calculated based on the detection result in the scanning position detection process. By calculating the scanning speed of the control light in each pixel, the amount of control light is corrected based on the scanning speed of the control light. Thereby, in a display device that controls the display panel by optical addressing, the display panel can be accurately controlled in correspondence with the display area, and can be displayed with an accurate light amount.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 shows a top configuration of a display device 100 according to Embodiment 1 of the present invention. In this embodiment, first, a schematic configuration of the display device 100 and optical addressing of the display panel 110 will be described, and then a configuration for controlling the control light optical system 120 will be described. The display device 100 includes a display panel 110, a control light optical system 120, a control unit 130, and a power source 140. The display panel 110 displays an image by causing a later-described organic EL layer to emit light. The control light optical system 120 includes a control light source 122, a galvanometer mirror 124, and a control light optical system drive unit 125.

  The control light source 122 supplies beam-shaped light, for example, control light L that is laser light. As the control light source 122, for example, a semiconductor laser element or a surface emitting laser element provided with a modulator can be used. The control light source 122 modulates and supplies the intensity of the control light L according to the image signal from the control unit 130. The control light L from the control light source 122 is reflected in the direction of the display panel 110 by the galvanometer mirror 124. The galvanometer mirror 124 can be created by, for example, MEMS (Micro Electro Mechanical Systems) technology. The galvanometer mirror 124 scans the control light L in two directions, that is, the X direction and the Y direction, by rotating around the X axis and the Y axis, which are predetermined two axes substantially orthogonal to each other.

  The rotation of the galvanometer mirror 124 is controlled by the control unit 130 according to the image signal. The control light optical system driving unit 125 drives the control light source 122 and the galvanometer mirror 124 according to the image signal from the control unit 130. In this way, the control light optical system 120 scans the surface of the display panel 110 with the control light L. As the control light L, an ultraviolet laser, a visible light laser, or an infrared laser can be used. Further, not only laser light but also beam-like light, for example, light from a light emitting diode element (LED) may be used as the control light L.

  FIG. 2 shows the galvanometer mirror 124 and the display panel 110 when the display device 100 is viewed from the side. When viewed from the side surface of the display device 100, the control light L is incident at a predetermined tilt angle θ from a position below the normal line N at a substantially central position of the display panel 110 to a substantially central position of the display panel 110. The galvanometer mirror 124 is provided at a position where the control light L is incident on the display panel 110 at a tilt angle θ from an oblique direction. As described above, when the control light L from the galvanometer mirror 124 is incident obliquely at the tilt angle θ, the distance in the Z-axis direction between the galvanometer mirror 124 and the display panel 110 is reduced. Since the galvanometer mirror 124 can be provided near the display panel 110 in the Z-axis direction, the display device 100 can be thinned.

  Further, when the control light L is incident at the tilt angle θ, the optical path between the galvanometer mirror 124 and the display panel 110 is compared with the case where the control light L is incident from a direction substantially perpendicular to the display panel 110. Can be long. Since the optical path from the galvanometer mirror 124 to the display panel 110 becomes longer, the angular range in which the galvanometer mirror 124 rotates can be reduced. The galvanometer mirror 124 rotates at high speed according to the image signal. For this reason, when the control light L is incident on the display panel 110 at the tilt angle θ, the optical path from the galvanometer mirror 124 to the display panel 110 can be made long, so that the driving load of the galvanometer mirror 124 can be reduced. As described above, when the control light L is incident on the display panel 110 at the tilt angle θ, the display device 100 can be made thinner than when the control light L is incident on the display panel 110 from a substantially vertical direction. The driving load of the galvanometer mirror 124 can be reduced.

  Returning to FIG. 1, the display panel 110 includes a display area AR <b> 1 where an image is displayed and a non-display area AR <b> 2 provided at the outer edge of the display area AR <b> 1. The display area AR1 is an area having a substantially rectangular shape including a side substantially parallel to the Y direction that is the first direction and a side substantially parallel to the X direction that is the second direction substantially orthogonal to the Y direction. On the surface of the display panel 110 on the side where the control light optical system 120 is provided, a first optical sensor 132 and a second optical sensor 134 which are scanning position detection units are provided. The first optical sensor 132 and the second optical sensor 134 detect that the control light L is scanning the display area AR <b> 2 of the display panel 110. As the first optical sensor 132 and the second optical sensor 134, for example, a photodiode can be used. The first optical sensor 132 and the second optical sensor 134 are each connected to the control unit 130.

  FIG. 3 shows the display device 100 showing the configuration of the display panel 110 in detail. The substrate 201 is a parallel plate made of an optically transparent glass member, polymer member, or the like. On the substrate 201, an optically transparent first transparent electrode layer 202 and a conductivity variable layer 203 are sequentially stacked. The first transparent electrode layer 202 can be composed of an ITO film. The conductivity variable layer 203 changes the electrical conductivity by the control light L transmitted through the first transparent electrode layer 202. For example, amorphous silicon (hereinafter referred to as “a-Si”) or a photosensitive organic film can be used for the conductivity variable layer 203. For example, it is desirable that a-Si contains hydrogen. Further, a-Si is formed by a vapor deposition method (CVD method). In a state where the control light L is not irradiated at all, a-Si functions as an insulating member having an electrical conductivity of approximately zero (that is, a resistance value of approximately infinite). In contrast, when a-Si is irradiated with the control light L, the conductivity increases (that is, the resistance value decreases) according to the amount of light. The region where the conductivity changes in the variable conductivity layer 203 is a region of the first transparent electrode layer 202 irradiated with the control light L.

  An organic EL layer 204 is provided on the conductivity variable layer 203. The organic EL layer 204 is configured by laminating a hole transport layer, an organic light emitting layer, and an electron transport layer (not shown). As a material for the hole transport layer, for example, a triazole derivative can be used. For the organic light emitting layer, for example, a benzothiazole compound can be used. For the electron transport layer, for example, an electron transport compound such as a diphenylquinone derivative can be used. Note that a hole transport material and an electron transport material may be mixed in the organic light emitting layer without providing the hole transport layer and the electron transport layer. When a current flows through the organic EL layer 204, holes from the hole transport layer and electrons from the electron transport layer are combined in the organic light emitting layer. The fluorescent material of the organic light emitting layer is excited by energy generated when holes and electrons are combined. When the excited fluorescent material returns to the ground state, a light emission phenomenon occurs, and light is generated from the organic light emitting layer.

  The display area AR2 of the display panel 110 is an area where the organic EL layer 204 is provided. A plurality of pixels are provided in the display area AR2. The display panel 110 displays an image by the organic EL layer 204 emitting light for each of a plurality of pixels. The plurality of pixels can be provided by providing a partition in the organic EL layer 204 or the like. Each pixel has an R light pixel that supplies red light (hereinafter referred to as “R light”), a G light pixel that supplies green light (hereinafter referred to as “G light”), and blue light. (Hereinafter referred to as “B light”).

  The organic light emitting layer of each color light pixel contains a different fluorescent material for each color light. The organic light emitting layer of each color light pixel generates light in different wavelength regions because the amount of energy generated when each fluorescent material returns from the excited state to the ground state. Then, when light in different wavelength regions is generated, each color light pixel generates R light, G light, and B light, respectively. Thus, by providing the R light pixel, the G light pixel, and the B light pixel, a full-color image can be obtained. Note that the pixels are not provided in the non-display area AR1 of the display panel 110.

  The second transparent electrode layer 205 can be composed of an ITO film, like the first transparent electrode layer 202. On the second transparent electrode layer 205, a protective layer 206 made of an optically transparent member similar to the substrate 201 is provided. As a method for stacking the layers constituting the display panel 110, a resistance heating vacuum deposition method, an electron beam heating vacuum deposition method, a sputtering method, an ion plating method, a casting method, a spin coating method, or the like can be used as appropriate.

  The power source 140 is connected between the first transparent electrode layer 202 and the second transparent electrode layer 205. The power supply 140 supplies a current to the display panel 110 in order to cause the organic EL layer 204 to emit light. The control light optical system 120 is provided on the substrate 201 side with respect to the display panel 110. Then, the control light L reflected from the galvanometer mirror 124 toward the display panel 110 is incident on the substrate 201 side surface of the display panel 110. The control light optical system 120 scans the surface of the substrate 201 of the display panel 110 with the control light L.

  Next, a configuration for optical addressing of the display panel 110 will be described. The control light L from the control light optical system 120 passes through the substrate 201 of the display panel 110 and the first transparent electrode layer 202 and enters the conductivity variable layer 203. When the control light L having an intensity corresponding to the image signal enters the conductivity variable layer 203, the electrical conductivity of the portion at the incident position of the control light L increases according to the amount of the control light L. Strictly speaking, the region where the conductivity of the conductivity variable layer 203 changes tends to spread around the irradiation position in proportion to the intensity of the control light L and its irradiation time. Here, it is assumed that the control light L is scanned at high speed by the galvanometer mirror 124, and that the conductivity only changes in the vicinity of the region irradiated with the control light L.

  As the conductivity of the conductivity variable layer 203 increases, one electrode of the power supply 140 connected to the first transparent electrode layer 202 is connected to the first transparent electrode layer 202 and the conductivity variable layer 203. Via, it is electrically connected to the organic EL layer 204. The other electrode of the power supply 140 is connected to the second transparent electrode layer 204. The conductivity of the variable conductivity layer 203 changes according to the amount of control light L that has passed through the first transparent electrode layer 202. When the conductivity of the conductivity variable layer 203 changes according to the amount of control light L, a current corresponding to the amount of control light L flows through the organic EL layer 204. When the current according to the amount of the control light L flows, the organic EL layer 204 can emit light according to the control light L. Furthermore, by controlling the position where the control light L is incident using the control light optical system 120, the organic light emitting layer 204 can emit light for each pixel in accordance with the image signal, and an image can be displayed.

  Next, a configuration for controlling the control light optical system 120 will be described. FIG. 4 shows the configuration of the display panel 110 viewed from the galvanometer mirror 124 side. The galvanometer mirror 124 scans the control light L in the Y direction, which is the first direction, and then sets a predetermined spatial interval in the X direction, which is the second direction, and reverses the Y direction in the Y direction. Scan in the direction. For example, the control light L that has scanned the position x1 in the X direction in the Y direction minus moves in the X direction by the interval | x1-x2 |, and scans the position x2 in the X direction in the plus direction in the y direction. The predetermined spatial interval in the X direction at this time is, for example, a length corresponding to one pixel. In this way, the control light L repeats scanning in the Y direction and movement in the X direction.

  As described above, the galvanometer mirror 124 (see FIG. 2) causes the control light L to enter the display panel 110 from the lower side with the tilt angle θ. For this reason, when the galvano mirror 124 is rotated in substantially the same angular range when the control light L is scanned in the Y direction, the scanning area AR3 expands widely as the position becomes farther from the position of the galvano mirror 124. It has a trapezoidal shape. As shown in FIG. 4, the control light L scans in a meandering scanning locus S in a trapezoidal scanning area AR3 larger than the display area AR1 of the display panel 110.

  Each of the first sensor 132 and the second sensor 134 has a strip shape having a longitudinal direction in the X direction. The first optical sensor 132 is provided in the non-display area AR1 in the vicinity of one side m1 of the display area AR2 substantially parallel to the X direction. The second photosensor 134 is provided in the non-display area AR1 in the vicinity of the other side m2 of the display area AR2 facing the side m1. The first sensor 132 and the second sensor 134 are both provided so that the length in the longitudinal direction is substantially the same as the length of the side m1 and the side m2, or slightly longer than the length of the side m1 and the side m2. ing.

  For example, when the control light L scans the position x1 in the X direction in the y direction, the control light L passes through the first optical sensor 132 and the second optical sensor 134. The control light L scans the display area AR2 between when the control light L passes through the first optical sensor 132 and when the control light L passes through the second optical sensor 134. After the control light L passes through the second optical sensor 134, when the control light L passes through the second optical sensor 134 again at the position x2, and when the control light L passes through the first optical sensor 132. The control light L scans the display area AR2.

  The first optical sensor 132 and the second optical sensor 134 detect the control light L, so that the control light L scans the display area AR2 during the time during which the control light L is detected by each other. Is detected. The first optical sensor 132 and the second optical sensor 134 repeat this at any position in the X direction, and detect that the control light L is scanning the display area AR2. In this way, the first optical sensor 132 and the second optical sensor 134 can detect that the control light L is scanning the display area AR <b> 2 of the display panel 110.

  A configuration for correcting the control light L by the control unit 130 (see FIG. 1) will be described using the circuit shown in FIG. The control unit 130 includes a timing correction unit 510 and a light amount correction unit 520. Based on the detection results from the first optical sensor 132 and the second optical sensor 134, the timing correction unit 510 displays an image only when the control light L is scanning the display area AR2 (see FIG. 4). The control light source 122 (see FIG. 1) is controlled in accordance with the signal PS. The clock generation unit 512 generates a timing clock signal in synchronization with the timing at which the control light L is detected by the first optical sensor 132 and the second optical sensor 134. Then, the clock synthesis unit 514 combines the input image signal PS and the timing clock signal from the clock generation unit 512, and outputs a signal P1 to the calculation unit 530. With this output signal P1, the control unit 130 can control the light source 122 for control light according to the image signal PS only when the control light L scans the display area AR2.

  6 shows the output of the light source 122 for control light when the control light L is scanning the position x1 in the X direction shown in FIG. 4 in the Y direction, and the first optical sensor 132 and the second optical sensor 134. The example of a timing with the output of is shown. FIG. 7 shows the output of the control light source 122 when the control light L is scanning the position xn in the X direction in the Y direction, and the outputs of the first light sensor 132 and the second light sensor 134. An example of timing is shown. 6 and 7, the vertical axis represents the output amount and the horizontal axis represents time t. By correcting the output timing of the image signal PS, the control unit 130 outputs the image signal PS only when the control light L is scanning the display area AR2. As shown in FIGS. 6 and 7, the control light source 122 supplies the control light L having a light amount corresponding to the image signal PS only when the control light L scans the scanning area AR2. it can.

  The light amount correction unit 520 corrects the light amount of the control light L that is modulated according to the image signal PS based on the scanning speed so that a predetermined gradation level is obtained for a predetermined pixel. The conductivity variable layer 203 (see FIG. 3) varies in conductivity depending on the irradiation time of the control light L in addition to the light amount of the control light L. For example, even if the amount of control light L is substantially constant, the amount of change in conductivity is considered to be small because the amount of light of control light L is dispersed in a wider region as the scanning speed of control light L is increased. Therefore, it can be considered that the conductivity can be accurately changed by increasing the amount of the control light L as the scanning speed increases.

  As described above, the galvanometer mirror 124 (see FIG. 2) causes the control light L to enter the display panel 110 from the lower side with the tilt angle θ. For this reason, when the galvano mirror 124 is rotated in substantially the same angular range when the control light L is scanned in the Y direction, the scanning speed of the control light L in one pixel is determined by the display panel 110 from the position of the galvano mirror 124. It gets bigger as you go further. When the galvano mirror 124 is reciprocally rotated, the scanning speed when the control light L scans the center of the scanning area AR3 is the scanning speed when the control light L scans both ends of the scanning area AR3. It becomes large compared. As described above, even during the scanning of the control light L in the Y direction, a difference may occur in the scanning speed of the control light L. The light amount correction unit 520 corrects the light amount of the control light L based on such a difference in scanning speed. In order to correct the light amount of the control light L so that the predetermined pixel has a desired gradation level, the light amount correction unit 520 accurately calculates the scanning speed of the control light L in the predetermined pixel in the scanning speed calculation unit 522. There is a need to.

  The scanning speed calculation unit 522 calculates the scanning speed of the control light L in each pixel based on the detection results of the first optical sensor 132 and the second optical sensor 134. Here, calculation of the scanning speed of the control light L in each pixel by the scanning speed calculation unit 522 will be described. The scanning speed calculation unit 522 calculates the scanning speed corresponding to the position of the control light L in the Y direction and the position of the control light L in the X direction. First, calculation of the scanning speed corresponding to the position of the control light L in the Y direction will be described. When the control light L is incident on the display panel 110 at the tilt angle θ, the scanning speed of the control light L in one pixel increases as the position of the display panel 110 becomes farther from the position of the galvanometer mirror 124.

  Referring to FIG. 4, when the control light L is incident on the display panel 110 in an oblique direction from the lower side, for example, the position x1 on the upper side of the display panel 110 is a position on the lower side of the display panel 110. It is a position farther than xn. For this reason, the time required for the control light L to scan the display area AR2 in the Y direction is shorter when the control light L is at the position x1 than when the control light L is at the position xn. Comparing FIG. 6 and FIG. 7, the time t1 for scanning the display area AR2 at the position x1 is shorter than the time tn for scanning the display area AR2 at the position xn. Here, assuming that the number of pixels parallel in the Y direction at the position x1 and the position xn is the same, the scanning speed of the control light L at the pixel parallel to the position x1 is the control light at the pixel parallel to the position xn. Greater than L scanning speed.

  As described above, the scanning speed of the control light L increases as the position of the display panel 110 becomes farther from the position of the galvanometer mirror 124. Therefore, the scanning speed calculation unit 522 calculates the scanning speed according to the positions x1 to xn of the control light L in the X direction. Assuming that the rotation speed of the galvanometer mirror 124 is substantially constant, the time t during which the control light L scans the display area AR2 in the Y direction is substantially constant at each position x1 to xn. Therefore, the position of the control light L in the X direction can be obtained from the time t when the control light L scans the display area AR2 based on the detection results of the first optical sensor 132 and the second optical sensor 134. .

  Next, calculation of the scanning speed corresponding to the position of the control light L in the Y direction will be described. When the galvano mirror 124 is reciprocally rotated, the scanning speed of the control light L increases as it approaches the center of the display area AR2 while the control light L scans in the Y direction. Further, the closer to both ends in the Y direction, the lower the scanning speed of the control light L. Thus, the scanning speed of the control light L in the Y direction differs depending on the position in the Y direction. Therefore, the scanning speed calculation unit 522 calculates the scanning speed according to the position of the control light L in the Y direction.

  The calculation of the scanning speed corresponding to the position of the control light L in the Y direction will be described with reference to FIG. The galvanometer mirror 124 reciprocally rotates in order to scan the control light L repeatedly in the Y direction. Assuming that the angular range in which the galvano mirror 124 rotates is substantially constant, the angular position θ of the galvano mirror 124 when scanning the control light L in the Y direction and the time t are expressed as a sine function as shown in FIG. Can be expressed as In the graph shown in FIG. 8, the vertical axis represents the angular position θ of the galvano mirror 124, and the horizontal axis represents time t. The angular position θ of the galvanometer mirror 124 is represented by 0 at the center of the angle range in which the galvanometer mirror 124 rotates, and + θ and −θ at both ends of the angle range in which the galvanometer mirror 124 rotates.

  The black dots on the graph indicate the angular position θ of the galvanometer mirror 124 at the time when the control light L is detected by the first optical sensor 132 and at the time when the control light L is detected by the second optical sensor 134. For example, the control light L scans the display area AR2 between the time ta when the control light L is detected by the first light sensor 132 and the time tb when the control light L is detected by the second light sensor 134. ing. The position of the control light L in the Y direction corresponds to the angular position θ of the galvanometer mirror 124. Therefore, the relationship between the time t and the position of the control light L in the Y direction can be obtained by the sine function shown in FIG.

  The scanning speed calculation unit 522 calculates the scanning speed of the control light L in each pixel using the interpolation value calculated from the detection results of the first optical sensor 132 and the second optical sensor 134. From the detection results of the first optical sensor 132 and the second optical sensor 134 and the sine function shown in FIG. 8, the relationship between the scanning position of the control light L in the display area AR2 and the time t can be obtained. it can. From the relationship between the scanning position of the control light L and the time t, the scanning speed calculation unit 522 obtains the time during which the control light L scans each pixel arranged in parallel in the Y direction as an interpolation value. If the length of the pixel in the Y direction is divided by the time during which the control light L scans the pixel, the scanning speed for each pixel can be obtained. In this way, the scanning speed calculation unit 522 calculates the scanning speed for each pixel based on the detection results of the first optical sensor 132 and the second optical sensor 134. Note that the graph shown in FIG. 8 is for explanation of calculating the scanning speed, and the relationship between the position of the control light L and the time in the actual display device 100 may be different from the illustration.

  The correction value calculation unit 524 calculates a light amount correction value based on the scanning speed calculated by the scanning speed calculation unit 522. For example, the correction value calculation unit 524 may calculate a light amount correction value in proportion to the scanning speed, or may store a light amount correction value corresponding to the scanning speed in advance. The memory 526 stores a target value for the amount of light emitted from the display panel 110. The target value is corrected according to the scanning speed by adding the signal from the memory 526 to the output from the correction value calculation unit 524. The memory 526 adds the output from the correction value calculation unit 524, and then outputs the signal P2 to the calculation unit 530. Based on the output signal P2, the control unit 130 corrects the light amount of the control light L modulated according to the image signal PS based on the scanning speed so that a predetermined gradation level is obtained for a predetermined pixel.

  The calculation unit 530 calculates a current value based on the output P1 from the timing correction unit 510 and the output P2 from the light amount correction unit 520. Then, the calculation unit 530 outputs the calculation result to the control light optical system driving unit 125 (see FIG. 1). In this way, the control light source 122 is controlled by the control unit 130 to scan the control light L at an accurate position corresponding to the display area AR2 and to display the display panel 110 with an accurate light amount. The

  A specific example of control of the control light source 122 by the controller 130 will be described with reference to FIGS. 9 and 10. FIG. 9 shows a control example of the control light source 122 at the position x1 shown in FIG. The control unit 130 controls the control light source 122 according to the image signal only when the control light L scans the display area AR2. The control light source 122 performs output according to the image signal at a time t1 when the control light L scans the display area AR2. Further, the control unit 130 corrects the light amount of the control light L that is modulated according to the image signal based on the calculated scanning speed.

  The control unit 130 calculates the scanning speed of the control light L in each pixel based on the detection results of the first optical sensor 132 and the second optical sensor 134. The scanning speed of the control light L is calculated based on the position x1 in the X direction and the position in the Y direction. The graph of the scanning speed of the control light L shown in FIG. 9 shows the relationship between the calculated scanning speed and time t. Then, as shown in FIG. 9, a correction value of the light amount of the control light L is calculated based on the calculated scanning speed. The graph of the light amount correction value of the control light L shown in FIG. 9 shows the relationship between the calculated light amount correction value of the control light L and time t. Here, the control unit 130 obtains the detection results of the first optical sensor 132 and the second optical sensor 134 at a position adjacent to the position x1, for example, a position x0 outside the area of the display panel 110, so that the position x1 is detected. A correction value of the light amount of the control light L can be calculated. In the same manner, for the position x2, for example, the correction value of the light quantity of the control light L can be calculated based on the detection results of the first optical sensor 132 and the second optical sensor 134 at the position x1. .

  The control unit 130 controls the control light source 122 based on the correction value of the light amount of the control light L. The output value of the control light source 122 is corrected from the value indicated by the broken line in FIG. 9 to the value indicated by the solid line. The control light source 122 is controlled so that the amount of light increases at both ends of the display area AR2 at the position x1 based on the position x1 in the X direction. The control light source 122 is controlled so that the amount of light is further increased based on the position in the Y direction at the center of the display area AR2.

  FIG. 10 shows a control example of the control light source 122 at the position xn shown in FIG. The control light source 122 performs output according to the image signal at a time tn when the control light L scans the display area AR2. Further, the output of the control light source 122 is controlled based on the scanning speed of each pixel, similarly to the control light L at the position x1. Here, the output of the control light source 122 is compared between the position x1 shown in FIG. 9 and the position xn shown in FIG. At the position x1, the output of the control light source 122 is controlled so that the amount of light increases at both ends of the display area AR2.

  On the other hand, at the position xn, the output of the control light source 122 at both ends of the display area AR2 hardly changes compared to before the light amount is corrected according to the position in the X direction. Also at the position xn, the control light source 122 is controlled so as to increase the amount of light in the central portion of the display area AR2, similarly to the position x1. Further, the amount of change in the light amount of the control light L while the control light L scans the position xn is larger than the amount of change in the light amount of the control light L while scanning the position x1. By controlling the control light source 122 in this way, the control unit 130 can cause predetermined pixels of the display panel 110 to emit light at a desired gradation level.

  The control light source 122 supplies the control light L modulated according to the image signal only in the display area AR2. In this case, if there is a display area AR2 in the scan area AR3, even if the shape of the scan area AR3 and the shape of the display area AR2 do not match, only the display area AR2 of the display panel 110 is modulated according to the image signal. The control light L is supplied. Even when the scanning area AR3 of the control light L is trapezoidal, the control light L can be supplied to the position of the substantially rectangular display area AR2. By supplying the control light L to the position of the substantially rectangular display area AR2 and accurately controlling the display panel 110, the display area AR2 of the display panel 110 can be caused to emit light accurately.

  Based on the detection results from the first optical sensor 132 and the second optical sensor 134, the control unit 130 can match the timing at which the control light L scans each pixel with the timing clock of the image signal. In this way, the control light optical system 120 can be controlled in accordance with the image signal only when the control light L is scanning the display area AR2. Since the timing clock of the image signal may be adjusted based on the detection results from the first optical sensor 132 and the second optical sensor 134, for example, compared with the case where the angular range in which the galvano mirror rotates is adjusted. Thus, the control light L can be easily supplied into the display area AR2.

  The control unit 130 corrects the light amount of the control light L that is modulated according to the image signal based on the calculated scanning speed. In the region where the scanning speed of the control light L is high, the control unit 130 performs correction for adding the current value. When the current values are added, the control light source 122 supplies a larger amount of control light L that is modulated in accordance with the image signal. By increasing the amount of control light, the light emitted from the pixel can be brightened to a desired gradation level.

  In the region where the scanning speed of the control light L is low, the control unit 130 performs correction for subtracting the current value. When the current value is subtracted, the control light source 122 supplies a smaller amount of control light L that is modulated in accordance with the image signal. By reducing the light amount of the control light L, the brightness of the emitted light of the pixel can be reduced to a desired gradation level. Thus, in the display panel 110, the light emitted from a predetermined pixel is set to a desired gradation level. When the light emitted from a predetermined pixel is set to a desired gradation level, it is possible to reduce unevenness in brightness of a display image that is not related to the image signal, and to perform accurate display corresponding to the image signal. Thereby, in the display apparatus 100 which controls the display panel 110 by optical addressing, the display area AR2 of the display panel 110 can be caused to emit light accurately and can be displayed with an accurate light amount.

  9 and 10, in the non-display area AR1 of the display panel 110, the control light source 122 can set the control light L to a substantially constant light amount regardless of the image signal. When the control light L is scanned on the non-display area AR1 of the display panel 110, the first light sensor 132 and the second light sensor 134 can detect the control light L. Further, if the light amount of the control light L is substantially constant in the non-display area AR1, a period in which the light amount of the control light L becomes substantially constant at a constant frequency during the operation of the display device 100 is provided. By performing monitoring and feedback of the light amount of the control light L at this time, the output amount of the control light L from the control light optical system 120 can be controlled to be constant.

  Monitoring and feedback of the light amount of the control light L is performed by a light amount sensor 541 and an APC (automatic power control) circuit 543 shown in the circuit of FIG. The APC circuit 543 controls the control light source 122 so that the amount of light of the control light source 122 becomes substantially constant in accordance with a signal from the light amount sensor 541. The calculation result in the APC circuit 543 is added to or subtracted from the calculation result of the calculation unit 530. The control light source 122 is controlled according to the output from the calculation unit 530 and the output from the APC circuit 543. Note that at least one of the first optical sensor 132 and the second optical sensor 134 serving as the scanning position detection unit may function as the light amount sensor 541.

(Modification)
FIG. 11 shows a schematic configuration of a display device 1100 that is a modification of the first embodiment. The same parts as those of the display device 100 are denoted by the same reference numerals, and redundant description is omitted. The display device 1100 of this modification is the same as the display device 100 described above in that it includes a first optical sensor 1132 and a second optical sensor 1134. As described above, the first optical sensor 132 and the second optical sensor 134 of the display device 100 are provided in the non-display area AR1 of the display panel 110. On the other hand, in the display device 1100 of the present modification, the first optical sensor 1132 and the second optical sensor 1134 are on the optical path of the control light L between the galvanomirror 124 and the display panel 110. It is characterized by.

  FIG. 12 shows the positions of the first optical sensor 1132 and the second optical sensor 1134 and the display panel 110. The first optical sensor 1132 is provided on the optical path of the control light L that enters the non-display area AR1 in the vicinity of the side m1 of the display area AR2 that is substantially parallel to the X direction that is the second direction. The second optical sensor 1134 is provided on the optical path of the control light L incident on the non-display area AR1 near the other side m2 of the display area AR2 facing the side m1. As described above, even if the first optical sensor 1132 and the second optical sensor 1134 are provided on the optical path of the control light L incident on the non-display area AR1, the optical sensor 132 and the second optical sensor 132 of the display device 100 described above are provided. Similarly to the optical sensor 134, it can be detected that the control light L is scanning the display area AR2.

  FIG. 13 shows a schematic configuration of a display device 1300 according to the second embodiment of the present invention. The same parts as those of the display device 100 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The display device 1300 of this embodiment includes voltage detection electrodes 1331 and 1332 which are scanning position detection units, and voltage detection units 1337 and 1338.

  In the non-display area AR1 of the display panel 110, a first voltage detection electrode 1331 and a second voltage detection electrode 1332 are provided. The first and second voltage detection electrodes 1331 and 1332 are disposed on the conductivity variable layer 203 (see FIG. 2) on the side opposite to the side facing the control light optical system 120. Similarly to the first and second photosensors 132 and 134 of the first embodiment, the first and second voltage detection electrodes 1331 and 1332 are respectively opposed to the vicinity of the side of the display area AR2. Is provided. In the present embodiment, a configuration in which two voltage detection electrodes 1331 and 1332 are provided is shown, but a configuration in which a single voltage detection electrode is provided may be employed.

  A resistor 1333 is electrically connected between the first voltage detection electrode 1331 and the ground electrode 1335. A first voltage detection unit 1337 is electrically connected to both ends of the resistor 1333. The first voltage detector 1337 detects the voltage applied to the first voltage detection electrode 1331 by detecting the voltage across the resistor 1333. A resistor 1334 is electrically connected between the second voltage detection electrode 1332 and the ground electrode 1336. A second voltage detector 1338 is electrically connected to both ends of the resistor 1334. The second voltage detector 1338 detects the voltage applied to the second voltage detection electrode 1332 by detecting the voltage across the resistor 1334.

  Next, a configuration for controlling the control light source 122 will be described. The control light L scans the display panel 110 along a locus S that passes through the display area AR2 and the non-display area AR1 as in the display panel 110 of the first embodiment shown in FIG. The first voltage detector 1337 detects that the control light L is incident on the position of the first voltage detection electrode 1331 by detecting the voltage of the first voltage detection electrode 1331. The second voltage detector 1338 detects that the control light L is incident on the position of the second voltage detection electrode 1332 by detecting the voltage of the second voltage detection electrode 1332. By detecting the control light L as described above, the first and second voltage detectors 1337 and 1338 control the same as the first and second optical sensors 132 and 134 (see FIG. 1) of the first embodiment. It is detected that the light L is scanning the display area AR2. With this configuration, it is possible to accurately detect the control light L for scanning the position of the non-display area AR1 where the first and second voltage detection electrodes 1331 and 1332 are provided.

  Then, similarly to the display device 100 of the first embodiment, the control unit 1330 scans the display area AR2 with the control light L based on the detection results from the first and second voltage detection units 1337 and 1338. The control light source 122 is controlled according to the image signal only when In addition, the control unit 1330 corrects the light amount of the control light L that is modulated according to the image signal based on the calculated scanning speed so that a predetermined gradation level is obtained for a predetermined pixel. The scanning speed of the control light L in each pixel is calculated based on the detection results from the first and second voltage detectors 1337 and 1338. Thereby, in the display apparatus 100 which controls the display panel 110 by optical addressing, the display area AR2 of the display panel 110 can be caused to emit light accurately and can be displayed with an accurate light amount.

  When the control light L scans the non-display area AR1, the control light L can be set to a substantially constant light amount that is not related to the image signal. The first and second voltage detection units 1337 and 1338 are applied to the first and second voltage detection electrodes 1331 and 1332 by scanning the non-display area AR1 of the display panel 110 with the control light L. The voltage can be detected. Accordingly, the first and second voltage detection units 1337 and 1338 can detect that the control light L is scanning the display area AR2. Furthermore, if the light amount of the control light L is substantially constant when the control light L scans the non-display area AR1, the light amount of the control light L can be monitored and fed back. Accordingly, similarly to the display device 100 of the first embodiment, the control unit 1330 can perform control such that the output amount of the control light L from the control light source 122 is constant.

  FIG. 14 shows a schematic configuration of a display device 1400 according to the third embodiment of the present invention. The same parts as those of the display device 100 of the first embodiment are denoted by the same reference numerals, and redundant description is omitted. The display device 1400 of this embodiment is characterized in that a modulation unit 1410 that is a display panel modulates illumination light in accordance with an image signal. The display device 1400 includes an illumination light source unit 1401 provided with a plurality of light emitting diode elements (hereinafter referred to as “LEDs” as appropriate) that are solid state light emitting elements.

  The illumination light source unit 1401 includes an R light LED 1402R that supplies R light, a G light LED 1402G that supplies G light, and a B light LED 1402B that supplies B light. The illumination light supplied from the illumination light source unit 1401 passes through the field lens 1403 and then enters the modulation unit 1410 that is a display panel. The field lens 1403 has a function of illuminating the modulation unit 1410 in a telecentric manner, that is, a function of making the illumination light enter the modulation unit 1410 as parallel to the principal ray as much as possible. The display device 1400 forms an image of the illumination light source unit 1401 at the position of the entrance pupil 1407 of the projection lens 1405. For this reason, the modulation unit 1410 is Koehler illuminated by the illumination light supplied from the illumination light source unit 1401.

  The spatial light modulation device 1420 includes a modulation unit 1410 and a control light optical system 120. The modulation unit 1410 has a plurality of movable mirrors 1411 as drive units on the surface on the projection lens 1405 side. The movable mirror 1411 rotates according to the image signal. The plurality of movable mirrors 1411 are arranged in a substantially orthogonal lattice pattern on the plane of the modulation unit 1410 on the projection lens 1405 side. The modulation unit 1410 rotates the movable mirror 1411 according to the image signal to reflect the illumination light from the illumination light source unit 1401 in the direction of the projection lens 1405 or in a direction other than the projection lens 1405.

  The modulation unit 1410 expresses a gradation by changing the amount of light reflected by each movable mirror 1411 and incident on the entrance pupil 1407 of the projection lens 1405 according to the image signal. In this way, the modulation unit 1410 modulates the illumination light from the illumination light source unit 1401 according to the image signal. The projection lens 1405 projects the light modulated by the modulation unit 1410 onto the screen 1406. Note that the modulation unit 1410 includes a display area in which a plurality of movable mirrors 1411 are arranged, and a non-display area provided on the outer edge of the display area. A projected image is formed by modulating a plurality of movable mirrors 1411 provided in the display area according to an image signal.

Next, the configuration of the light control movable mirror device 1510 will be described with reference to FIG. The light control movable mirror device 1510 is configured to drive one movable mirror 1411. The light-controlled movable mirror device 1510 can be created by MEMS (Micro Electro Mechanical Systems) technology. The insulating layer 1504 is formed by a sputtering technique at a position on the conductivity variable layer 203 excluding a substantially central region. For the insulating layer 1504, for example, SiO ₂ can be used. An electrode 1505 is provided over the insulating layer 1504. The driving electrode 1506 is provided directly on the conductivity variable layer 203. The electrode 1605 and the driving electrode 1506 can be made of a conductive material such as aluminum (Al).

  The power source 1440 has one electrode connected to the transparent electrode layer 202 and the other electrode connected to the electrode 1505. Accordingly, the power source 1440 applies a predetermined voltage between the transparent electrode layer 202 and the electrode 1505. Over the electrode 1505, a movable mirror 1411 and a support portion 1507 for supporting the movable mirror 1411 so as to be movable are formed. The movable mirror 1411 can be made of a conductive material such as aluminum (Al). The support portion 1507 is a conductive flexible member or a conductive elastic member (such as a metal spring). Since the support portion 1507 has conductivity, the movable mirror 1411 and the electrode 1505 have the same potential through the support portion 1507.

  Next, control of the light control movable mirror device 1510 by the control light L will be described. The control light L enters the light control movable mirror device 1510 from the substrate 201 side. The movable mirror 1411 is driven by a predetermined force according to the potential difference between the driving electrode 1506 and the movable mirror 1411, for example, electrostatic force (attraction) F. The intensity of the electrostatic force F changes corresponding to the light amount of the control light L. The movable mirror 1411 takes a position state corresponding to the strength of the electrostatic force F. By changing the position state of the movable mirror 1411, the amount of light incident on the entrance pupil 1407 of the projection lens 1405 can be changed as described above. Therefore, by changing the amount of the control light L according to the image signal, it is possible to display a continuous change amount corresponding to the analog signal. Each light controllable movable mirror device 1510 of the modulation unit 1410 is controlled by optical addressing.

Next, a configuration for the control unit 1430 to control the control light source 122 will be described.
In the same manner as the control unit 130 (see FIG. 1) of the display device 100 of the first embodiment, the control unit 1430 scans the control light L in the display area of the modulation unit 1410 provided with the plurality of movable mirrors 1411. The control light source 122 is controlled according to the image signal only when Further, the control unit 1430 corrects the light amount of the control light L from the control light source 122 based on the scanning speed of the control light L.

  Modulator 1410 is driven by applying a voltage corresponding to the conductivity of variable conductivity layer 203. For this reason, when the conductivity changes due to the change in the scanning speed of the control light L, the voltage applied to the light control movable mirror device 1410 also changes in accordance with the change in the scanning speed of the control light L. For example, as the scanning speed of the control light L increases, the conductivity of the conductivity variable layer 203 decreases. When the conductivity of the conductivity variable layer 203 decreases, the voltage applied to the drive electrode 1406 decreases.

  When the voltage applied to the driving electrode 1406 is reduced, the potential difference between the driving electrode 1406 and the movable mirror 1411 is reduced, so that the electrostatic force F is also reduced. For this reason, when the scanning speed of the control light L increases, the amount of movement by which the movable mirror 1411 rotates may decrease. On the contrary, when the scanning speed of the control light L decreases, the amount of movement by which the movable mirror 1411 rotates may increase. As described above, when the scanning speed of the control light L changes, it may be difficult to drive the movable mirror 1411 according to the image signal. In particular, since the display device 1400 displays a continuous change amount corresponding to an analog signal, the amount of projection light changes due to a change in voltage.

  Similar to the display panel 110 of the first embodiment, the modulation unit 1410 is provided with a first optical sensor 132 that is a scanning position detection unit and a second optical sensor 134. Similar to the control unit 130 (see FIG. 1) of the display device 100 of the first embodiment, the control unit 1430 determines the amount of the control light L that is modulated according to the image signal based on the calculated scanning speed. To correct. For example, the control unit 1430 controls the light source 122 for control light so that the light amount of the control light L is increased for pixels with a high scanning speed of the control light L. By controlling the control light source 122 so as to correct the light quantity of the control light L, the modulation unit 1410 can be driven accurately according to the image signal. By driving the modulator 1410 accurately according to the image signal, the illumination light can be modulated accurately according to the image signal.

  As described above, the control unit 1430 corrects the light amount of the control light L modulated according to the image signal based on the scanning speed so that a predetermined gradation level is obtained for a predetermined pixel. Thereby, in the display apparatus 1400 which performs control by optical addressing, there is an effect that the movable mirror 1411 can be accurately driven. Even when the continuous change amount is displayed by the voltage as in the display device 1400, the change in the light amount due to the temperature change can be reduced, and the image can be displayed with an accurate light amount.

  Note that the display device 1400 of this embodiment is configured to include the movable mirror 1411 as a drive unit, but is not limited to the configuration in which the movable mirror 1411 is provided. Any drive unit that can be driven by voltage is applicable to the present invention. For example, a display device using a liquid crystal layer as a driving unit may be used. In the case where a liquid crystal layer is used as the driving unit, the display device can use either a configuration that transmits illumination light by driving the liquid crystal layer or a configuration that reflects illumination light. In addition, the illumination light source unit of the display device 1400 is not limited to the LED, and may be a semiconductor laser element, another solid light emitting element such as an electroluminescent (EL) element, a lamp other than the solid light emitting element, or the like. it can.

  As described above, the display device according to the present invention is useful when displaying a presentation or a moving image.

1 is a top view of a display device according to Embodiment 1 of the present invention. Explanatory drawing of the position of a galvanometer mirror and a display panel. Explanatory drawing of a display panel. Explanatory drawing of a display area, a non-display area, and a scanning area. The circuit diagram of a display apparatus. Explanatory drawing of the output of the light source for control lights, and the output of the 1st, 2nd optical sensor. Explanatory drawing of the output of the light source for control lights, and the output of the 1st, 2nd optical sensor. Explanatory drawing about calculation of scanning speed. Explanatory drawing of the example of control of the light source for control lights by a control part. Explanatory drawing of the example of control of the light source for control lights by a control part. FIG. 6 is a schematic configuration diagram of a display device according to a modified example of the first embodiment. Explanatory drawing of the position of a 1st, 2nd optical sensor and a display panel. The schematic block diagram of the display apparatus which concerns on Example 2 of this invention. FIG. 6 is a schematic configuration diagram of a display device according to Example 3 of the invention. The block diagram of a light control movable mirror device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Display apparatus, 110 Display panel, 120 Control light optical system, 122 Control light light source, 124 Galvanometer mirror, 125 Control light optical system drive part, 130 Control part, 132 1st optical sensor, 134 2nd light Sensor, 140 power supply, 201 substrate, 202 first transparent electrode layer, 203 conductivity variable layer, 204 organic EL layer, 205 second transparent electrode layer, 206 protective layer, 510 timing correction unit, 512 clock generation unit, 514 Clock synthesis unit, 520 light amount correction unit, 522 scanning speed calculation unit, 524 correction value calculation unit, 526 memory, 530 calculation unit, 541 light amount sensor, 543 APC circuit, 1100 display device, 1132 first optical sensor, 1134 second Optical sensor, 1300 display device, 1330 control unit, 1331 for first voltage detection Electrode, 1332 Second voltage detection electrode, 1333, 1334 Resistance, 1335, 1336 Ground electrode, 1337 First voltage detection unit, 1338 Second voltage detection unit, 1400 Display device, 1401 Illumination light source unit, 1402R LED for R light, LED for 1402G G light, LED for 1402B B light, 1403 field lens, 1405 projection lens, 1406 screen, 1406 driving electrode, 1407 entrance pupil, 1410 modulator, 1411 movable mirror, 1420 spatial light modulator , 1430 control unit, 1440 power supply, 1504 insulating layer, 1505 electrode, 1506 driving electrode, 1507 support unit, 1510 light control movable mirror device, AR1 non-display area, AR2 display area, L control light, θ tilt angle, N method Line, AR3 scan Area, S locus, m1, m2 side, x1, xn position, PS image signal, P1, P2 output, t1, tn time, F electrostatic force

Claims (11)

A display panel that includes a conductivity variable layer whose electrical conductivity changes according to the amount of control light, and displays an image by applying a current or voltage according to the conductivity for each of a plurality of pixels;
A power supply for applying a current or voltage to the display panel;
A control light optical system for supplying the control light to the display panel by scanning the control light in a scanning area larger than the display area of the display panel;
A scanning position detector that detects that the control light is scanning the display area of the display panel;
A scanning speed calculation unit that calculates a scanning speed of the control light in each pixel based on a detection result from the scanning position detection unit;
A control unit that controls the optical system for control light so as to modulate the amount of the control light according to an image signal,
The control unit controls the control light optical system according to the image signal only when the control light scans the display area based on the detection result from the scanning position detection unit. And
Further, the control unit corrects the light amount of the control light modulated according to the image signal based on the calculated scanning speed so that a predetermined gradation level is obtained for the predetermined pixel. A display device characterized by that.   The display device according to claim 1, wherein the display panel includes an electroluminescence layer that emits light by a current corresponding to the conductivity. An illumination light source for supplying illumination light;
The display panel has a drive unit that is driven by applying a voltage according to the conductivity,
The display device according to claim 1, wherein the driving unit is driven to transmit or reflect the illumination light.   The display device according to claim 2, wherein the scanning position detection unit is an optical sensor. The control light optical system scans the control light in a first direction and a second direction substantially orthogonal to the first direction by rotating about two predetermined axes. Have
The display panel includes a substantially rectangular display area having sides substantially parallel to the first direction and sides substantially parallel to the second direction, and a non-display provided on an outer edge of the display area. An area, and
The scanning unit repeatedly scans the control light in the first direction and then scans in the first direction at a predetermined spatial interval in the second direction. Scanning the control light in the display area and the non-display area,
The photosensors are a first photosensor and a second photosensor,
The first optical sensor is provided on an optical path of the control light incident on the non-display area in the vicinity of one side of the display area substantially parallel to the second direction,
The said 2nd optical sensor is provided on the optical path of the said control light which injects into the said non-display area | region in the vicinity of the other one side of the said display area facing the said one side. The display device described.   The display device according to claim 5, wherein the control unit controls the control light optical system to scan the control light having a substantially constant light amount in the non-display area of the display panel. The display panel comprises the display area and a non-display area provided at an outer edge of the display area,
The scanning position detection unit includes a voltage detection electrode that detects a voltage, and a voltage detection unit that detects a voltage applied to the voltage detection electrode,
4. The voltage detection electrode is provided in the non-display region on the side opposite to the side on which the control light is incident, in contact with the conductivity variable layer. The display device described. The control light optical system scans the control light in a first direction and a second direction substantially orthogonal to the first direction by rotating back and forth about two predetermined axes. Having a scanning unit,
The display panel includes a substantially rectangular display area having sides substantially parallel to the first direction and sides substantially parallel to the second direction, and a non-display provided on an outer edge of the display area. An area, and
The scanning unit repeatedly scans the control light in the first direction and then scans in the first direction at a predetermined spatial interval in the second direction. Scanning the control light in the display area and the non-display area,
The scanning speed calculation unit calculates the scanning speed of each pixel corresponding to the position of the control light in the second direction. Display device.   The display device according to claim 8, wherein the scanning speed calculation unit further calculates the scanning speed of each pixel corresponding to the position of the control light in the first direction.   10. The scanning speed calculation unit according to claim 8, wherein the scanning speed calculation unit calculates the scanning speed of each pixel by using an interpolation value calculated from the detection result of the scanning position detection unit. Display device. It has a conductivity variable layer whose electrical conductivity changes according to the amount of control light, and has a display panel that displays an image by applying a current or voltage according to the conductivity for each of a plurality of pixels. A display device control method comprising:
A control light supply step of supplying the control light to the display panel by scanning the control light in a scanning area larger than the display area of the display panel;
A scanning position detecting step of detecting that the control light is scanning the display area of the display panel;
A scanning speed calculation step of calculating a scanning speed of the control light in each pixel based on a detection result in the scanning position detection step;
A light amount modulation step of modulating the light amount of the control light in the control light supply step according to an image signal,
In the light amount modulation step, the light amount of the control light is modulated in accordance with the image signal only when the control light is scanning the display area based on the detection result in the scanning position detection step. ,
Further, in the light amount modulation step, the light amount of the control light modulated according to the image signal is corrected based on the calculated scanning speed so that a predetermined gradation level is obtained for the predetermined pixel. A control method for a display device.

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