JP5692546B2 - Image display device and image adjustment method - Google Patents

Description

  The present invention relates to an image display device and an image adjustment method.

  A projector that measures the illuminance around the projector and adjusts the color and brightness of the image according to the illuminance has been proposed. For example, in Japanese Patent Laid-Open No. 2006-267144, a threshold value of an illuminance sensor is selected according to the arrangement of the illuminance sensor with respect to the ground plane, and at least one of the luminance component and the color component of the video signal is changed according to the measurement value of the illuminance sensor. The projector to be used is described.

JP 2006-267144 A

  However, even if the projector installation state is the same and the illuminance around the projector is the same, the measured illuminance value may change when a different projector is applied. The method of selecting the threshold value of the illuminance sensor according to only the installation state is not sufficient.

  Some aspects of the present invention provide an image display device and an image adjustment method capable of accurately adjusting an image according to illuminance regardless of the applied image display device by solving the above-described problems. Is to provide.

  An image display device according to an aspect of the present invention includes at least one external light measurement unit that measures the illuminance of external light and generates a measurement value indicating the illuminance, and the external light is supplied to the external light measurement unit. A light guide for guiding, a storage unit that stores correction data indicating correction values for each type of the light guide that affects the measurement value, a correction unit that corrects the measurement value based on the correction data, and And an adjustment unit that adjusts at least one of the color and brightness of the image based on the measurement value.

  An image adjustment method according to one aspect of the present invention includes a computer having an image display device including at least one external light measurement unit and a light guide for guiding external light to the external light measurement unit. The external light measurement unit measures the illuminance of external light to generate a measurement value indicating the illuminance, stores correction data indicating a correction value for each type of the light guide that affects the measurement value, and the correction data Based on the above, the measurement value is corrected, and at least one of the color and brightness of the image is adjusted based on the corrected measurement value.

  According to the present invention, the image display device accurately adjusts the image according to the illuminance by correcting the measurement value according to the type of the light guide for guiding the external light to the external light measurement unit such as the illuminance sensor. It can be performed.

Further, the storage unit stores color mode data for each type of the light guide indicating correspondence between the illuminance and the color mode, and the adjustment unit is applied based on the measurement value and the color mode data. The color tone mode to be determined may be determined, and at least one of the color and brightness of the image may be adjusted according to the color tone mode.

  According to this, the image display device is applied by determining the color tone mode using the measured value corrected according to the type of the light guide and the color tone mode data corresponding to the type of the light guide. Regardless of this, it is possible to accurately adjust the image according to the illuminance.

  The image display device includes a determination unit, and the storage unit changes at least one of the minimum value and the maximum value of the illuminance corresponding to the color mode after the color mode to be applied once is determined. Hysteresis data indicating a value is stored, and the determination unit determines whether or not the measurement value is within a range corresponding to a color mode being applied in a state in which the change value is reflected, and the adjustment unit includes: When the measurement value is not within the range, a color tone mode to be newly applied is determined based on the color tone mode data, and at least one of the color and brightness of the image is adjusted according to the color tone mode, and the measurement If the value is within the range, the currently applied adjustment may be continued as the adjustment of the image.

  According to this, the image display apparatus can adjust the image appropriately even when the measured value of illuminance changes by using the hysteresis data.

  The image display device may include an update unit that updates at least one of the color tone mode data and the hysteresis data based on request information indicating a request for changing at least one of the color tone mode data and the hysteresis data.

  According to this, since the image display apparatus can determine the color tone mode or the like according to the actual use environment, it is possible to display a more appropriate image.

  The image display device may be formed as a projector, and the external light measurement unit may be provided on the top surface of the projector.

  According to this, since the projector can appropriately grasp the influence of ambient light, illumination, etc. regardless of the grounding state such as stationary or ceiling suspension, it is possible to accurately adjust the image according to the illuminance. it can.

1 is an external view of a projector according to a first embodiment. It is a figure which shows a part of AA 'cross section in FIG. It is a functional block diagram of the projector in a 1st Example. It is a figure which shows an example of a response | compatibility with the illumination intensity and color tone mode in the color tone mode data in the case of a home projector. It is a figure which shows an example of a response | compatibility with the illumination intensity and color tone mode in the color tone mode data in the case of a business projector. It is a flowchart which shows the image adjustment procedure in a 1st Example. It is a figure which shows an example of a response | compatibility with the illumination intensity and color tone mode after the 2nd time.

  Embodiments in which the present invention is applied to a projector will be described below with reference to the drawings. In addition, the Example shown below does not limit the content of the invention described in the claim at all. In addition, all of the configurations shown in the following embodiments are not necessarily essential as means for solving the problems described in the claims.

(First embodiment)
FIG. 1 is an external view of a projector 100 according to the first embodiment. A projector 100, which is a type of image display device, is a portable projector. A plurality of operation buttons 121, a zoom ring 122 for zoom adjustment, and a focus ring 123 for focus adjustment are provided on the upper surface facing the ground plane of the projector 100. An external light measurement unit 110 for measuring the illuminance of light (for example, illumination light such as a fluorescent lamp, sunlight, etc.) is provided.

  FIG. 2 is a diagram showing a part of the AA ′ cross section in FIG. 1. The external light measurement unit 110 includes a transparent cover 114, a light guide 116, and an illuminance sensor 112. The light guide 116 has a function of guiding light transmitted through the cover 114 from the gap of the housing 104 to the illuminance sensor 112, a function of preventing light from the light source of the projector 100 from entering the illuminance sensor 112, and the cover 114. A function for preventing the inside of the projector 100 from being confirmed is provided.

  The light guide 116 is integrated with the key top of the operation button 121 and is formed of plastic or the like. Further, the illuminance sensor 112 is provided on the substrate 106 on which the pressure-sensitive portion 108 of the operation button 121 and the like are provided.

  For example, when the color of the housing 104 is black, the color of the operation button 121 is also black, and the color of the light guide 116 is often black. For example, when the color of the housing 104 is white, the color of the operation button 121 is also white, and the color of the light guide 116 is often white. As shown in FIG. 2, the light transmitted through the cover 114 is reflected by the light guide 116 and is incident on the illuminance sensor 112, so that it is affected by the color of the light guide 116. Since the white light guide 116 has a higher reflectance than black, the measured value of the illuminance sensor 112 varies depending on the color of the light guide 116 even if the light is the same outside light.

  The projector 100 according to the present embodiment corrects the measurement value of the external light measurement unit 110 according to the type of the projector 100 (the type classified according to the color of the light guide 116), and thus the model of the projector 100 and the like. The influence on the measured value due to the difference is reduced.

  Further, as shown in FIG. 1, when the external light measurement unit 110 is arranged adjacent to the operation part, the measurement target region of the external light measurement unit 110 is covered during operation, and the measurement value changes. Therefore, a general projector tends to affect image brightness adjustment and the like. The projector 100 according to the present embodiment determines the color tone mode (color mode) using the history data of the measurement value, and further uses the hysteresis data when determining the color tone mode for the second and subsequent times, thereby changing the measurement value. The influence by is suppressed.

  Next, functional blocks of the projector 100 having such functions will be described. FIG. 3 is a functional block diagram of the projector 100 according to the first embodiment. The projector 100 measures the illuminance of external light and generates an external light measurement unit 110 that generates a measurement value indicating the illuminance, an operation unit 120 that generates operation information and the like according to a user operation, and corrects the measurement value. An image in which an image signal is input from a correction unit 130, a storage unit 140 that stores various data, an update unit 135 that updates the data according to operation information and the like, and an image supply device such as a PC (Personal Computer) The input unit 150, the adjustment unit 160 that adjusts the color and brightness of the image, the control unit 170 that performs various controls, the determination unit 180 that performs various determinations, and the projection unit 190 that projects the adjusted image. It is comprised including.

Further, the storage unit 140 includes illuminance, a color tone mode, color tone mode data 142 indicating color and brightness adjustment values for each color mode, history data 144 indicating a plurality of measurement values at different time points, and illuminance corresponding to the color mode. Hysteresis data 146 indicating a change value that changes the minimum value and maximum value, setting data 148 indicating a predetermined number of measurements, determination reference value, and the like, and correction data 149 indicating a correction value for each type of projector 100 that affects the measurement value Etc. are remembered.

  Note that the color tone mode data 142 is provided for each type of the projector 100. FIG. 4 is a diagram showing an example of correspondence between illuminance and color tone mode in the color tone mode data 142 in the case of a home projector. FIG. 5 is a diagram showing an example of correspondence between illuminance and color tone mode in the color tone mode data 142 in the case of a commercial projector.

  For example, when the type of the projector 100 is a home projector, the applied color mode when the illuminance is 0 or more and less than 30 is theater, and the applied color mode when the illuminance is 30 or more and less than 100 is Living 1, and the illuminance is The applied color tone mode in the case of 100 or more and less than 200 is Living 2, and the applied color tone mode in the case of illuminance of 200 or more is dynamic.

  Further, for example, when the type of the projector 100 is a professional projector, the applied color mode when the illuminance is 0 or more and less than 80 is theater, and the applied color mode when the illuminance is 80 or more and less than 200 is presentation 1. The applied color tone mode when the illuminance is 200 or more and less than 400 is presentation 2, and the applied color mode when the illuminance is 400 or more is dynamic.

  In this embodiment, it is assumed that the type of the projector 100 is a home projector, and the color tone mode data 142 shown in FIG. 4 is applied.

  The projector 100 may function as each of these units using the following hardware. For example, in the projector 100, the external light measurement unit 110 is an illuminance sensor 112, the operation unit 120 is an operation button 121, a focus ring 122, a remote controller, etc., a correction unit 130, an update unit 135, a control unit 170, and a determination unit 180 are CPUs. The storage unit 140 is a non-volatile memory, the image input unit 150 is an image signal input terminal, a converter, the adjustment unit 160 is a CPU, an image processing circuit, the projection unit 190 is a lamp, a liquid crystal panel, a liquid crystal drive circuit, a lens, etc. May be used.

  Next, an image adjustment procedure in the projector 100 will be described. FIG. 6 is a flowchart showing an image adjustment procedure in the first embodiment.

  Based on the setting data 148, the control unit 170 sets the illuminance outside the projector 100 to the external light measurement unit 110 at a specified number of times (for example, 10 times) at a set measurement time interval (for example, every 0.5 seconds). Let me measure. The external light measurement unit 110 measures the external illuminance in accordance with the control by the control unit 170 and generates a measurement value indicating the illuminance (step S1). As shown in FIG. 1, since the external light measurement unit 110 is provided on the upper surface of the projector 100, it measures the illuminance on the upper side.

  The correction unit 130 corrects the measurement value based on the type of the projector 100 indicated by the flag, user input information, and the like and the correction data 149 (step S2). Specifically, for example, when the type of the projector 100 is a home projector, the color of the housing 104 is black, the color of the light guide 116 is also black, and the type of the projector 100 is a business projector. Assume that the housing 104 has a white color and the light guide 116 has a white color. For example, when the color of the light guide 116 is a white type, the correction unit 130 may perform correction to reduce the measurement value compared to the case where the color of the light guide 116 is a black type.

  The update unit 135 updates the history data 144 based on the measurement value from the external light measurement unit 110 (step S3).

  The determination unit 180 determines whether it is the first adjustment (step S4). In the case of the first adjustment, the adjustment unit 160 determines a color tone mode to be applied based on the type of the projector 100, the color tone mode data 142, and the history data 144 (step S5).

  On the other hand, if it is not the first adjustment, that is, if it is the second or subsequent adjustment, the determination unit 180 determines whether or not the change state is present (step S6). If it is not the change state, the color mode to be applied is determined based on the type of the projector 100, the color mode data 142, the history data 144, and the hysteresis data 146 (step S7). On the other hand, when it is a change state, it becomes a color mode to which the current color mode is applied.

  The change state is, for example, a state where the illuminance is changing rapidly, a state where the illuminance is changing, or the like. That is, the change state indicates that the brightness state around the projector 100 is changing. Specifically, for example, when the difference between the minimum value and the maximum value of a measurement value at a given number of measurements (for example, 10 times) is equal to or greater than a first predetermined value (for example, 50), the illuminance is sharp. It corresponds to the state that has changed. In addition, for example, the illuminance varies when the difference value is less than the first predetermined value and the second predetermined value (for example, 30 or the like) smaller than the first predetermined value continues. It corresponds to the state.

  Here, correspondence between the illuminance and the color tone mode at the first time and after the second time will be described. As described above, since the type of the projector 100 of this embodiment is a home projector, the correspondence between the illuminance and the color tone mode in the first time corresponds to the diagram shown in FIG. Moreover, FIG. 7 is a figure which shows an example of a response | compatibility with the illumination intensity and color tone mode after the 2nd time.

  For example, in the initial state, the applied color mode when the illuminance is 0 or more and less than 30 is theater, the applied color mode when the illuminance is 30 or more and less than 100 is Living 1, and the illuminance is 100 or more and less than 200. The applied color mode is Living 2, and the applied color mode when the illuminance is 200 or more is dynamic. When the measurement value of the first illuminance (for example, the average value of the measurement values in 10 measurements) is 110, the applied color mode is Living 2.

  Once the color tone mode is determined, the change value of the hysteresis data 146 is reflected in the upper and lower illuminance values corresponding to the color tone mode. Here, it is assumed that the change value is 20. That is, after the second time, the upper limit and lower limit of the illuminance corresponding to the color mode being applied are changed by 20, the upper limit is 220, and the lower limit is 80. Thereby, the applied color tone mode when the illuminance is 80 or more and less than 220 becomes the living room 2.

  Therefore, for example, when the second illuminance measurement value is 95, the color mode changes from living 2 to living 1 in the normal method, but in the method of this embodiment, the color mode remains unchanged in living 2. .

  The adjustment unit 160 adjusts the image according to the determined color tone mode (step S8). More specifically, for example, the adjustment unit 160 determines the image brightness, contrast, hue, color density, sharpness, color temperature, and projection unit 190 according to the adjustment value of the color tone mode indicated by the color tone mode data 142. The brightness of the lamp is adjusted, and an image is generated based on the image signal from the image input unit 150.

  The projection unit 190 projects an image on a screen or the like with the adjustment by the adjustment unit 160 (step S9).

  Based on the operation information from the operation unit 120, the projector 100 determines whether or not there is an end instruction (step S10). If there is no end instruction, the projector 100 continues a series of processes (steps S1 to S10). If there is, the series of processing ends.

  As described above, according to the present embodiment, the projector 100 corrects the measurement value according to the type of the projector 100, thereby accurately adjusting the image according to the illuminance regardless of the projector 100 to which the projector 100 is applied. It can be carried out. Thereby, the user can observe an image with an optimal image quality.

  Further, according to the present embodiment, the projector 100 is applied by determining the color tone mode using the measured value corrected according to the type of the projector 100 and the color tone mode data 142 according to the type of the projector 100. Regardless of the projector 100, it is possible to accurately adjust the image according to the illuminance.

  In addition, according to the present embodiment, the projector 100 can display an appropriate image even when the measurement value of illuminance changes by adjusting the image according to whether or not the change state. it can.

  Further, according to the present embodiment, the projector 100 can display an appropriate image even when the measurement value of the illuminance changes by using the hysteresis data 146.

  Further, according to the present embodiment, the projector 100 can appropriately determine whether or not the projector 100 is in a change state according to the difference value between the minimum value and the maximum value of the measurement value, and thus the measurement value of illuminance changes. Even in this case, an appropriate image can be displayed.

  In particular, as illustrated in FIG. 1, when the external light measurement unit 110 is disposed adjacent to the operation unit 120, the measurement value of illuminance is easily changed by the operation of the operation unit 120. By adjusting the image according to whether or not, the appropriate image can be displayed even when the measured value of illuminance changes.

(Other examples)
In addition, application of this invention is not limited to the Example mentioned above, A various deformation | transformation is possible. For example, what affects the measured value of illuminance is not limited to the color of the light guide 116, and for example, the reflectance of the light guide 116, the shape of the light guide 116, the light amount of the light source of the projection unit 190, the liquid crystal of the projection unit 190. The measurement value may be corrected according to the transmittance of the panel, the aperture of the iris of the projection unit 190, the size of the room, the color or reflectance of the target area such as a screen or a wall.

  Further, the correction unit 130 may correct the upper limit value, the lower limit value, the reference value, and the like of the corresponding color mode described above according to the type of the projector 100, or may correct the determination value of the determination unit 180. Good.

  Further, the number of external light measurement units 110 is not limited to one, and may be two or more. For example, one external light measurement unit 110 may be provided on each of the upper surface and the rear surface of the projector 100 (opposite surfaces of the projection surface having the projection lens).

Further, the operation unit 120 generates request information indicating a change request for at least one of the specified number of times and the first predetermined value according to a user operation, and the update unit 135 sets setting data based on the request information. 148 is updated, and the determination unit 180 may determine whether or not the illuminance is changing rapidly based on the updated setting data 148.

  According to this, since the projector 100 can appropriately determine whether or not the state of change is in accordance with the actual use environment or the like, an appropriate image is displayed even when the measurement value of illuminance changes. can do.

  Further, the operation unit 120 generates request information indicating a change request of at least one of the color tone mode data 142, the hysteresis data 146, and the like according to a user operation, and the update unit 135 performs a color tone based on the request information. The mode data 142 and the like may be updated.

  According to this, the projector 100 updates the maximum value and minimum value of the illuminance corresponding to the color mode, the applicable color mode, the adjustment value for each color mode, the change value described above, and the like according to the user's request. Since the color tone mode and the like can be determined according to the actual use environment, a more appropriate image can be projected.

  Further, the adjustment unit 160 may adjust both the color and brightness of the image, or may adjust only the color of the image, or only the brightness of the image as the image adjustment according to the color tone mode. May be adjusted. In the above-described embodiment, the projector 100 uses both the history data 144 and the hysteresis data 146. However, the hysteresis data 146 may be used without using the history data 144, or the hysteresis data 146 is not used. The history data 144 may be used, or both the history data 144 and the hysteresis data 146 may not be used.

  Further, the adjustment unit 160 determines that the newly applied tone mode is different from the original tone mode by two or more levels (for example, in FIG. 6, the newly applied tone mode is “Theater” and the original tone mode is “ (In the case of “Living 2”, etc.) It may be changed to a color mode to be newly applied at one time, or it is changed to a color mode to be newly applied step by step (for example, in the above case, “Living 1” is temporarily applied. And then change to “theater”).

  Further, the color tone mode data 142 may be provided with three or more types of data according to the model and application of the projector 100. For example, the storage unit 140 stores color tone mode data for home use, color tone mode data for business use, and color tone mode data for educational use, and the adjustment unit 160 selects the color tone mode data according to a flag indicating the application. May be used.

  Further, the determination unit 180 determines that there is no change state for a specified time (for example, 5 seconds) after the new color mode is applied, or the adjustment unit 160 applies the new color mode. The color tone mode may be adjusted so as not to change during the specified time.

  According to this, since the projector 100 can suppress the change of the image, the user can easily observe the image.

  The projector 100 may function as each unit of the projector 100 described above by reading a program stored in the information storage medium.

  The projector 100 is not limited to a liquid crystal projector (transmission type, reflection type such as LCOS), and may be a projector using a digital micromirror device, for example. Further, the function of the projector 100 may be distributed to a plurality of devices (for example, a PC and a projector).

Further, the image display device is not limited to the projector 100, and may be a television, a digital camera, a digital video camera, a mobile phone, a portable game device, a liquid crystal display, or the like.

  100 projector, 104 housing, 106 substrate, 108 pressure sensing unit, 110 external light measurement unit, 112 illuminance sensor, 114 cover, 116 light guide, 120 operation unit, 121 operation button, 122 zoom ring, 123 focus ring, 130 correction , 135 update unit, 140 storage unit, 142 tone mode data, 144 history data, 146 hysteresis data, 148 setting data, 149 correction data, 150 image input unit, 160 adjustment unit, 170 control unit, 180 determination unit, 190 projection Part

Claims (8)

At least one external light measurement unit that measures the illuminance of external light and generates a measurement value indicating the illuminance;
A light guide for reflecting the external light transmitted through the cover and guiding it to the external light measurement unit ;
An adjustment unit that adjusts at least one of color and brightness of an image based on the type of the light guide and the measurement value;
An image display device. The image display device according to claim 1,
The type of the light guide is the color of the light guide.
Image display device. The image display device according to claim 1 or 2,
A storage unit for storing correction data indicating a correction value according to the type of the light guide;
A correction unit that corrects the measurement value based on the correction data;
Including
The adjustment unit adjusts at least one of color and brightness of the image based on the measurement value corrected by the correction unit.
Image display device. The image display device according to claim 3,
The storage unit stores color mode data corresponding to the type of the light guide indicating the correspondence between the illuminance and the color mode.
The adjustment unit determines the color tone mode to be applied based on the measurement value and the color tone mode data, and adjusts at least one of the color and brightness of the image according to the color tone mode.
Image display device. The image display device according to claim 4,
Including a judgment part,
The storage unit stores hysteresis data indicating a change value that changes at least one of the minimum value and the maximum value of the illuminance corresponding to the color tone mode after the color tone mode to be applied once is determined,
The determination unit determines whether the measurement value is within a range corresponding to a color mode being applied in a state in which the change value is reflected,
The adjustment unit determines a color tone mode to be newly applied based on the color tone mode data when the measurement value is not within the range, and determines at least one of the color and brightness of the image according to the color tone mode. Adjust and continue with the currently applied adjustment as the image adjustment when the measurement is within the range,
Image display device. The image display device according to claim 5,
An update unit that updates at least one of the color tone mode data and the hysteresis data based on request information indicating a change request for at least one of the color tone mode data and the hysteresis data;
Image display device. In the image display device according to any one of claims 1 to 6,
The image display device is formed as a projector,
The external light measurement unit is provided on the top surface of the projector,
Image display device. A computer having an image display device including at least one external light measurement unit and a light guide for reflecting external light transmitted through the cover and guiding the external light to the external light measurement unit ,
Causing the external light measurement unit to measure the illuminance of external light to generate a measurement value indicating the illuminance,
Adjusting at least one of color and brightness of the image based on the type of the light guide and the measured value;
Image adjustment method.

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