JP2013061442A - Electro-optical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce unevenness in image quality of a display surface of a display part viewed by a user through an optical system in an electro-optical apparatus including the display part and the optical system arranged opposite to the display part.SOLUTION: An electro-optical apparatus (10) includes a display part (12) for displaying an image on the basis of image data, an optical system (14) arranged opposite to the display part, and an image data correction part (152) for correcting inputted image data in accordance with characteristics of the display part and characteristics of the optical system and outputting the corrected image data to the display part.

Description

  The present invention relates to a technique for reducing unevenness of image quality in a display surface in an electro-optical device visually recognized by a user.

  Liquid crystal display panels (also called liquid crystal panels) are widely used as computer displays and television monitor displays. The liquid crystal display panel may look different (contrast ratio and color) depending on the viewing direction (angle). It is desirable that the difference in appearance depending on the viewing direction of the liquid crystal display panel is as small as possible.

  In Patent Document 1, a viewer who has become prominent with the increase in size of a liquid crystal display panel due to changes in luminance and chromaticity depending on the viewing angle of the liquid crystal display panel (also referred to as viewing angle characteristics). Describes a technique for correcting in-plane non-uniformity in image quality when viewed from above. Specifically, Patent Document 1 discloses a liquid crystal display panel and an output luminance level corresponding to the same input luminance level in each pixel data that inputs a video signal and contributes to the contrast of the video of the video signal. In-plane luminance difference caused by the viewing angle characteristics of the liquid crystal display panel is adjusted by adjusting the pixel farther from the reference pixel to be relatively larger with respect to the output luminance level of the reference pixel. A direct-view type liquid crystal display device having a luminance correction unit that corrects and outputs a corrected video signal to a liquid crystal display panel is described.

  Patent Document 2 describes that a correction circuit for generating a correction signal for correcting luminance unevenness due to liquid crystal layer thickness unevenness of a liquid crystal panel is provided.

  Patent Document 3 describes that the gain of display data is corrected in accordance with the display position in order to reduce the luminance unevenness of the display screen due to the luminance unevenness of the backlight.

  In recent years, an electronic view finder (EVF) that displays image information obtained by an image sensor on a display device such as a liquid crystal panel is widely used in a finder such as a digital camera or a video camera. In such EVF, an image displayed on a display device is enlarged by an optical system including an eyepiece and is visually recognized by a user.

JP 2006-5828 A JP 2000-56737 A JP 2007-65572 A

When an image displayed on the liquid crystal panel is viewed through an optical system, the unevenness of the image quality of the display surface of the liquid crystal panel viewed by the user may change depending on the characteristics (for example, magnification) of the optical system. .
Accordingly, the present invention provides a technique for reducing unevenness in image quality on the display surface of a display unit visually recognized by a user via the optical system in an electro-optical device having a display unit and an optical system arranged to face the display unit. The purpose is to provide.

The present invention relates to a display unit that displays an image based on image data, an optical system disposed opposite to the display unit, and input image data according to characteristics of the display unit and characteristics of the optical system. And an image data correction unit that outputs the corrected image data to the display unit.
According to this electro-optical device, an electro-optical device having a display unit and an optical system arranged to face the display unit corrects input image data according to the characteristics of the display unit and the characteristics of the optical system. Thus, as compared with a case where there is no image data correction unit that outputs the corrected image data to the display unit, unevenness in image quality on the display surface of the display unit visually recognized by the user via the optical system is reduced.

In a preferred aspect, the electro-optical device includes region definition data that defines the plurality of regions to divide the display surface of the display unit into a plurality of regions according to the characteristics of the display unit and the characteristics of the optical system, A data storage unit that stores conversion data associated with each region of the display unit, and the image data correction unit refers to the region definition data stored in the data storage unit to display the display A region to which each pixel belongs is specified from the plurality of regions, and a gradation value of the pixel included in the input image data is corrected based on conversion data associated with the specified region. The input image data may be corrected by converting it to a gradation value.
According to this electro-optical device, the amount of data stored in the correction data storage unit is reduced as compared with the case where conversion data is stored for each pixel of the display unit.

In another preferred aspect, the conversion data may include a conversion table that associates a gradation value included in the input image data with a gradation value included in the corrected image data.
According to this electro-optical device, compared to a case where the conversion data does not include a conversion table that associates the gradation value included in the input image data with the gradation value included in the corrected image data, The degree of freedom in associating the gradation values included in the corrected image data with the gradation values included in the corrected image data is great.

In still another preferred aspect, the input image data includes image data for each color of RGB, and the conversion data includes luminance of the display unit visually recognized by the user via the optical system of the RGB. A conversion table that associates the gradation value included in the image data for the dominant color, which is the color that most affects the unevenness of the image, with the corrected gradation value, and the image data correction unit includes the dominant color. The image data may be corrected for the dominant color based on the conversion table.
According to this electro-optical device, it is possible to shorten the processing time required for correcting the image data as compared to the case of correcting the image data for colors other than the dominant color.

In still another preferred aspect, the optical system can be attached with an attachment lens, the data storage unit stores a plurality of correction data each including the region definition data and the conversion data, and the electro-optical device includes: A correction data selection unit that selects one of a plurality of correction data stored in the data storage unit and supplies the selected data to the image data correction unit according to the characteristics of the attachment lens attached to the optical system. Also good.
According to this electro-optical device, compared to a case where a plurality of correction data is stored in the correction data storage unit and one of the plurality of correction data is not selected according to the characteristics of the attachment lens attached to the optical system, the attachment lens Even when attached, it is possible to reduce unevenness in the image quality of the display surface of the display section that is visually recognized through the optical system and the attachment lens.

In still another preferred aspect, the electro-optical device includes a lens information reading unit that reads lens information held in a lens information holding unit of the attachment lens, and the correction data selection unit is operated by the lens information reading unit. One of a plurality of correction data stored in the data storage unit may be selected based on the read lens information.
According to this electro-optical device, correction data can be selected based on the lens information of the attachment lens without the user inputting lens information of the attachment lens.

The rear view of the digital camera with which EVF concerning one Embodiment of this invention was integrated. The typical sectional view of EVF concerning one embodiment of the present invention. The figure which illustrates the relationship between the angle which looks at the pixel of a liquid crystal panel, and the visually recognized brightness | luminance. The figure which illustrates the brightness nonuniformity of the display surface of the liquid crystal panel visually recognized through an optical system. The block diagram which shows the functional structure of a control part. The figure which shows the example of correction | amendment data. The figure which shows the example of the division | segmentation of a display surface. The figure which shows the example of conversion data. The typical sectional view of EVF concerning modification 1. The figure which illustrates the correction data concerning the modification 1. The block diagram which shows the functional structure of the control part which concerns on the modification 1. As shown in FIG. The top view which shows an example of a structure of a projector. The figure which shows another example of the brightness nonuniformity of the display surface of the liquid crystal panel visually recognized through an optical system. The figure which shows another example of the division | segmentation of the display surface of a liquid crystal panel.

  FIG. 1 is a rear view of a digital camera 1 incorporating an electronic viewfinder (hereinafter, EVF) according to an embodiment of the present invention. As shown in FIG. 1, the digital camera 1 is provided with a main body 2 with a photographing lens (not shown) attached to the front side, a shutter button 3 and a power switch 4 provided on the upper surface of the main body 2, and a rear surface of the main body. Touch panel 5. The touch panel 5 has, for example, a touch pad disposed on a liquid crystal panel, and functions as a user interface having both functions of a display device and an input device. The touch panel 5 stores an image based on image data obtained by an image sensor (not shown) of the digital camera 1, a setting screen for allowing the user to set the digital camera 1, and a memory (not shown) such as a memory card. The captured image is displayed. The image data is data for designating the color and brightness displayed for each pixel of the image, and the data for each pixel is referred to as pixel data. The pixel data is, for example, 8-bit data indicating the intensity of each color of R (red), G (green), and B (blue) (that is, gradation values in the range of 0 to 255 (hereinafter referred to as pixel values)). It is. Normally, the digital camera 1 processes image data obtained by an image sensor according to various parameters set by the user (for example, exposure, shutter speed, aperture, white balance, ISO sensitivity, etc.) An image processing device (not shown) that compresses data is provided. When the user takes a picture using the digital camera 1, an image based on the processed image data output from the image processing apparatus is displayed on the touch panel 5, so that the user can reflect the parameters set by the user. Can be confirmed. An EVF 10 is provided on the upper portion of the main body 2.

  FIG. 2 is a schematic cross-sectional view of the EVF 10. The EVF 10 includes a liquid crystal panel 12 provided in the housing 11, a backlight 13 that irradiates light toward the liquid crystal panel 12, and a display surface of the liquid crystal panel 12 (surface opposite to the surface facing the backlight 13). And an optical system 14 disposed to face the display surface of the liquid crystal panel 12 in order to enlarge the image displayed on the screen. The optical system 14 includes an eyepiece. Although only one lens is shown in FIG. 2, the optical system 14 may have a plurality of lenses. In addition, a control unit 15 that controls the liquid crystal panel 12 is provided in the housing 11. As will be described in detail later, the control unit 15 corrects image data input from the image sensor or the image processing device of the digital camera 1 and supplies the corrected image data to the liquid crystal panel 12.

  FIG. 3 is a diagram illustrating the relationship between the viewing angle of the pixels of the liquid crystal panel 12 and the luminance that is visually recognized. FIG. 3A shows the liquid crystal panel 12 viewed in the direction along the display surface. As shown in FIG. 3A, when the viewpoint V is on a line L1 passing through the center point C of the display surface of the liquid crystal panel 12 and perpendicular to the display surface of the liquid crystal panel 12, an arbitrary pixel P on the liquid crystal panel 12 and The line L2 connecting the viewpoint V forms an angle Φ with the line L1 (Φ = 0 when the pixel P is located at the center point C). This angle Φ is referred to as an angle when the pixel P is viewed from the viewpoint V. FIG. 3B shows a viewpoint when image data having the same halftone pixel data (for example, each RGB component value is 100) is supplied to the liquid crystal panel 12 for each pixel P of the liquid crystal panel 12. It is a graph which shows an example of the brightness | luminance visually recognized when seeing the pixel P located in the direction of angle (PHI) from V.

  As shown in FIG. 3B, the luminance increases at the pixel P far from the center point C of the display surface of the liquid crystal panel (that is, the pixel P having a large angle Φ) as compared with the pixel P located at the center point C. There are things to do. This is presumably because, in each pixel P, the light from the backlight 13 leaks in a direction inclined with respect to the direction perpendicular to the display surface of the liquid crystal panel 12 without passing through the liquid crystal. In such a case, when the pixel P is viewed from the front (that is, in the direction along the line L1), even when the luminance specified by the pixel data is observed, the pixel P is viewed obliquely (for example, , Φ = 10 degrees), a luminance higher than the luminance specified by the pixel data is observed. Therefore, when the user views an image displayed on the display surface of the liquid crystal panel 12 through the optical system 14, even if the pixel data of all the pixels of the liquid crystal panel 12 are the same, the user can display the display on the liquid crystal panel 12. It seems that there is uneven brightness in the surface.

  FIG. 4 is a diagram illustrating the luminance unevenness of the display surface of the liquid crystal panel 12 visually recognized by the user through the optical system 14. FIG. 4A is displayed on the liquid crystal panel 12 when the pixel data of all the pixels of the liquid crystal panel 12 having the luminance characteristics shown in FIG. It shows the luminance unevenness of the display surface of the liquid crystal panel 12 visually recognized when the user views the image through the optical system 14. FIG. 4B is a diagram showing a luminance distribution along line AA in FIG. As shown in FIG. 4A, in this example, the shape of the display surface of the liquid crystal panel 12 is a rectangle. In FIG. 4A, the darker the gray portion, the closer the visible luminance is closer to the luminance specified by the pixel data, and the lighter the gray portion, the higher the visible luminance than the luminance specified by the pixel data. It shows that. In the example shown in FIG. 4A, the luminance changes concentrically around the central point C of the display surface of the liquid crystal panel 12, and the further away from the central point C, the higher than the luminance specified by the pixel data. The brightness is high. Therefore, in the area away from the center point C, the color appears to be whitish.

  Although the liquid crystal panel 12 has the same luminance unevenness characteristics (distribution of high (or low) luminance, the degree of luminance unevenness, etc.) of the display surface of the liquid crystal panel 12 as shown in FIG. It changes when different. This is because when the characteristic (for example, magnification) of the optical system 14 is different, the distance between the optical system 14 and the liquid crystal panel 12 is changed, and as a result, when viewing the pixel P far from the center point C of the display surface of the liquid crystal panel 12. This is because the angle Φ at which the pixel P is viewed changes. Although FIG. 4 shows luminance unevenness as an example of image quality unevenness, since the characteristics of unevenness in luminance generally differ for each color of RGB, color unevenness may occur in the display surface of the liquid crystal panel 12. In the present embodiment, in order to reduce unevenness in image quality of the display surface of the liquid crystal panel 12 that is visually recognized by the user due to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14, the control unit 15 corrects the image data and performs correction. The processed image data is supplied to the liquid crystal panel 12.

  FIG. 5 is a block diagram illustrating a functional configuration of the control unit 15. The control unit 15 includes an image data acquisition unit 151, an image data correction unit 152, and a correction data storage unit 153. The image data acquisition unit 151 acquires image data from the image sensor or the image processing device of the digital camera 1 and inputs the acquired image data to the image data correction unit 152. The image data correction unit 152 refers to the correction data stored in the correction data storage unit 153, corrects the image data input from the image data acquisition unit 151, and outputs the corrected image data to the liquid crystal panel 12. . The functions of the image data acquisition unit 151 and the image data correction unit 152 are realized by executing a program stored in a memory such as a ROM (Read Only Memory) by an arithmetic processing unit such as a CPU (Central Processing Unit). Good. The correction data storage unit 153 is implemented by a memory such as a ROM.

  The correction data storage unit 153 stores data necessary for image data correction executed by the image data correction unit 152 as correction data. Specifically, the correction data storage unit 153 corrects an image obtained by correcting area definition data for dividing the display surface of the liquid crystal panel 12 into a plurality of areas, and pixel values (input pixel values) included in the image data. Conversion data for conversion into pixel values (output pixel values) included in the data is stored as correction data. The area definition data is data that defines the range of each of the plurality of areas on the display surface. The conversion data is, for example, a conversion table (also referred to as a gamma curve) that associates input pixel values and output pixel values, and is stored in association with each area of the display surface of the liquid crystal panel 12.

  FIG. 6 is a diagram illustrating an example of correction data stored in the correction data storage unit 153. FIG. 7 is a diagram showing an example of division of the display surface of the liquid crystal panel 12 corresponding to the correction data shown in FIG. The correction data D1 shown in FIG. 6 corresponds to the combination of the liquid crystal panel 12 having the uneven brightness characteristic and the optical system 14 shown in FIG. The correction data D1 shown in FIG. 6 includes region definition data that defines four regions R1 to R4. Specifically, when the distance between the center point C of the display surface of the liquid crystal panel 12 and the pixel P is d, the region R1 is defined as a collection of pixels P where d <r1, and the region R2 is r1 ≦ d <r2. The region R3 is defined as a collection of pixels P satisfying r2 ≦ d <r3, and the region R4 is defined as a collection of pixels P satisfying r3 ≦ d (r1 <r2 < r3). That is, in this example, as shown in FIG. 7, the display surface of the liquid crystal panel 12 is divided into four regions R1 to R4 that are bounded by three concentric circles having radii r1, r2, and r3 with the center point C as the center. Is done. In such a division of the display surface of the liquid crystal panel 12, unevenness in the image quality of the display surface due to the characteristics of the liquid crystal panel 12 and the optical system 14 occurs concentrically around the center point C as shown in FIG. That is, the luminance changes in the radial direction and is substantially uniform in the circumferential direction). As shown in FIG. 6, the correction data D1 includes gamma curves G1 to G4 that associate input pixel values and output pixel values as conversion data associated with the regions R1 to R4.

  FIG. 8 is a diagram illustrating an example of conversion data (gamma curves G1 to G4) associated with each of the regions R1 to R4. In FIG. 8, the gamma curve G1 associated with the region R1 indicates that the input pixel value is equal to the output pixel value, that is, the input pixel value is not converted. This is because, in the luminance unevenness characteristic shown in FIG. 4, in the pixels in the vicinity of the center point C of the liquid crystal panel 12 (that is, the pixels in the region R1), the visually recognized luminance is approximately equal to the luminance specified by the pixel data. Because. The gamma curves G2 to G4 associated with the regions R2 to R4 indicate that the output pixel value is decreased by a predetermined value with respect to the input pixel value, and the decrease width increases in the order of the gamma curves G2, G3, and G4. It has become. This corresponds to the fact that in the luminance unevenness characteristic shown in FIG. 4, the luminance increases as the distance from the center point C of the liquid crystal panel increases. As described above, the gamma curves G1 to G4 are the output pixel values of the high luminance portion based on the luminance unevenness of the display surface of the liquid crystal panel 12 that is visually recognized due to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14. Is set lower than the input pixel value.

  When the image data is input, the image data correction unit 152 refers to the region definition data of each of the regions R1 to R4 stored in the correction data storage unit 153, and determines the region to which each pixel of the liquid crystal panel 12 belongs as the region R1. Identified from ~ R4. Further, the image data correction unit 152 performs pixel values (input pixel values) of each pixel included in the input image data based on the gamma curves G1 to G4 associated with the regions R1 to R4 specified for each pixel. ) Is converted into a corrected pixel value (output pixel value), thereby correcting the image data. As described above, since the regions R1 to R4 and the gamma curves G1 to G4 are determined according to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14, the regions R1 to R4 and the gamma curves G1 to G4 are used. By correcting the input image data, the image data correction unit 152 corrects the input image data according to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14.

  As described above, in the present embodiment, the input image data is corrected by the image data correction unit 152 according to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14, and the corrected image data is output to the liquid crystal panel 12. Therefore, the unevenness of the image quality of the display surface of the liquid crystal panel 12 that is visually recognized by the user due to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14 is reduced. Further, the display surface of the liquid crystal panel 12 is divided into a plurality of areas R1 to R4 according to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14, and the conversion data is associated with each of the areas R1 to R4 and the correction data storage unit 153. Therefore, the amount of data stored in the correction data storage unit 153 is reduced as compared with the case where conversion data is stored for each pixel of the liquid crystal panel 12.

  In this example, since the input pixel value is not converted in the region R1, storage of conversion data (gamma curve G1) for the region R1 may be omitted. Further, for each of the regions R1 to R4, three gamma curves corresponding to the RGB components may be stored, or one common gamma curve may be stored for the RGB components. Alternatively, among the RGB components, the dominant color (for example, G), which is the color that has the greatest influence on the luminance unevenness of the display surface of the liquid crystal panel 12 visually recognized by the user via the optical system 14. Only the conversion of the input pixel value to the output pixel value based on the gamma curve may be performed, and the conversion of the input pixel value to the output pixel value may not be performed for other colors (for example, R and B). This shortens the time required for conversion. Note that, from the ratio of the number of pyramidal cells of each color of RGB existing in the human retina, it is considered that the luminance unevenness in which the G color is visually recognized is usually the largest. For example, the color provided in the liquid crystal panel 12 When the thickness of the filter is different for each color, the color that is easily affected by the backlight light leaking in the direction inclined with respect to the direction perpendicular to the display surface of the liquid crystal panel 12 (that is, the dominant color) is G color. Other colors may be used.

<Modification>
The present invention is not limited to the above-described embodiment, and various modifications can be made. Hereinafter, some modifications will be described. Two or more of the following modifications may be used in combination.

(Modification 1)
FIG. 9 is a schematic cross-sectional view of the EVF 10 according to the first modification. As shown in FIG. 9, an additional optical system (hereinafter referred to as an attachment lens) 20 may be attached to the EVF 10 in order to change the magnification of the EVF 10. In that case, even if the liquid crystal panel 12 and the optical system 14 are the same, the characteristic of the image quality unevenness of the display surface of the liquid crystal panel 12 visually recognized by the user may change according to the characteristic (for example, magnification) of the attachment lens 20. The correction data storage unit 153 may store a plurality of correction data corresponding to the characteristics of the plurality of attachment lenses 20 that can be attached to the optical system 14.

  As shown in FIG. 9, the attachment lens 20 includes a memory 21 (an example of a lens information holding unit) such as a ROM that stores lens information such as magnification, manufacturer name, and model number. A contact 16 is provided on the surface of the EVF 10 to which the attachment lens 20 is attached. When the attachment lens 20 is attached to the EVF 10, lens information stored in the memory 21 of the attachment lens 20 is input to the control unit 15 of the EVF 10 via the contact 16.

  FIG. 10 is a diagram illustrating correction data according to the first modification. FIG. 11 is a block diagram illustrating a functional configuration of the control unit 15 according to the first modification. In FIG. 11, parts common to those in FIG.

  As shown in FIG. 10, in this example, a plurality of correction data D1, D2, D3,... Are stored in the correction data storage unit 153 corresponding to the magnifications of the plurality of attachment lenses 20 that can be attached to the EVF 10. Is done. The plurality of correction data D1, D2, D3... May be different in the number of areas on the display surface, area definition data in each area, and conversion data associated with each area.

  The control unit 15 illustrated in FIG. 11 includes a lens information reading unit 155 that reads lens information stored in the memory 21 of the attachment lens 20 via the contact 16, and an attachment lens included in the lens information read by the lens information reading unit 155. A correction data selection unit 154 that selects one of a plurality of correction data D 1, D 2, D 3... Stored in the correction data storage unit 153 and supplies the correction data to the image data correction unit 152. The point which has is different from the control part 15 shown in FIG. When the attachment lens 20 does not have the memory 21 storing the lens information, the user may input the lens information through the touch panel 5. The image data correction unit 152 corrects the input image data based on the correction data selected by the correction data selection unit 154 and outputs the corrected image data to the liquid crystal panel 12.

  As described above, in the first modification, a plurality of correction data D1, D2, D3,... Are stored in the correction data storage unit 153 according to the characteristics (magnification) of the attachment lens 20, and read by the lens information reading unit. Depending on the characteristics of the attachment lens 20, one of a plurality of correction data D 1, D 2, D 3... Stored in the correction data storage unit 153 is selected by the correction data selection unit 154 and supplied to the image data correction unit 152. Therefore, even when the attachment lens 20 is attached to the EVF 10, it is possible to reduce unevenness in the image quality of the display surface of the liquid crystal panel 12 of the EVF 10 that is visually recognized through the optical system 14 and the attachment lens 20.

  When the correction data corresponding to the input characteristics of the attachment lens 20 is not stored in the correction data storage unit 153, the image data correction unit 152 has a plurality of correction data D1 stored in the correction data storage unit 153. , D2, D3,..., Correction data corresponding to the characteristics of the input attachment lens 20 may be created by interpolation, and the input image data may be corrected based on the created correction data. For example, in the correction data storage unit 153, when the attachment lens 20 is not attached to the EVF 10, the magnification of the attachment lens 20 attached to the EVF 10 is 2.0 times, and the attachment lens 20 attached to the EVF 10 Let us consider a case where the attachment lens 20 with a magnification of 2.5 is attached to the EVF 10 when the corresponding correction data D1, D2, and D3 when the magnification of 3.0 is stored. In this case, interpolation by interpolation is performed based on the correction data D2 corresponding to the attachment lens 20 having a magnification of 2.0 and the correction data D3 corresponding to the attachment lens 20 having a magnification of 3.0 (for example, For each input pixel value (0 to 255), the average of the output pixel value based on the correction data D2 and the output pixel value based on the correction data D3 is the output pixel when the magnification of the attachment lens 20 is 2.5 times. By associating as a value), correction data (conversion data) corresponding to the attachment lens 20 having a magnification of 2.5 times may be created.

  In the above example, the correction data storage unit 153 stores a plurality of correction data D1, D2, D3,... Corresponding to the characteristics (magnification) of the plurality of attachment lenses 20 that can be attached to the optical system 14. The correction data selection unit 154 selects correction data in accordance with the characteristics of the attachment lens 20 input by the user using the touch panel 5, but the present invention is not limited to this. For example, the correction data storage unit 153 stores a plurality of correction data corresponding to other lens information (for example, manufacturer name and model number) that can specify the characteristics of the attachment lens 20, and the correction data selection unit 154 stores the lens Correction data associated with the manufacturer name and model number of the attachment lens 20 read by the information reading unit 155 (that is, corresponding to the characteristics of the attachment lens 20) may be selected and supplied to the image data correction unit 152.

(Modification 2)
In the above embodiment, the electro-optical device is EVF, but the present invention is not limited to this. The electro-optical device may be a head-mounted display or a projector, and may be an electro-optical device having a display unit and an optical system for enlarging an image displayed on the display unit.

  FIG. 12 is a plan view showing an example of the configuration of the projector. A projector 2100 shown in FIG. 12 is a three-plate projector using a liquid crystal panel as a light valve for each color of RGB.

  As shown in FIG. 12, a projector 2100 includes a lamp unit 2102 having a white light source such as a halogen lamp. The projection light emitted from the lamp unit 2102 is converted into three primary colors of R (red), G (green), and B (blue) by three mirrors 2106 and two dichroic mirrors 2108 arranged inside. To be separated. The separated projection light is guided to the light valves 100R, 100G, and 100B corresponding to the respective primary colors. B light has a longer optical path than other R and G colors. Therefore, in order to prevent the loss, light of B color is guided through a relay lens system 2121 having an incident lens 2122, a relay lens 2123, and an output lens 2124. It is burned.

  In the projector 2100, each of the light valves 100R, 100G, and 100B includes a liquid crystal panel in which the transmittance can be set for each pixel. The light valves 100R, 100G, and 100B are supplied with video signals that specify the gradation levels of the R, G, and B primary color components, and the light valves 100R, 100G, according to the supplied video signals. And 100B are driven respectively. The lights modulated by the light valves 100R, 100G, and 100B are incident on the dichroic prism 2112 from three directions. In the dichroic prism 2112, the R and B light beams are refracted at 90 degrees, and the G light beam travels straight. Accordingly, after the primary color images are combined, a color image is projected onto the screen 2120 by the projection lens group 2114. By changing the position of the projection lens group 2114 on the optical axis, the size of the image projected on the screen 2120 can be changed. The position of the projection lens group 2114 that maximizes the image size on the screen 2120 is referred to as the wide end, and the position of the projection lens group 2114 that maximizes the image size on the screen 2120 is referred to as the tele end.

  Since light corresponding to each of the R, G, and B colors is incident on the light valves 100R, 100G, and 100B by the dichroic mirror 2108, it is not necessary to provide a color filter. Further, the transmission images of the light valves 100R and 100B are projected after being reflected by the dichroic prism 2112, while the transmission image of the light valve 100G is projected as it is. Accordingly, the horizontal scanning direction by the light valves 100R and 100B is opposite to the horizontal scanning direction by the light valve 100G, and an image in which left and right are reversed is displayed.

  In the configuration of the projector 2100 shown in FIG. 12, the light valves 100R, 100G, and 100B, or the dichroic prism 2112 that synthesizes the display screens correspond to an example of the display unit of the present invention. The projection lens group 2114 corresponds to an example of the optical system of the present invention. The correction data storage unit 153 stores correction data corresponding to when the projection lens group 2114 is at the wide end (high magnification) and when it is at the tele end (low magnification). The image data correction unit 152 Correction data corresponding to the position of the projection lens group 2114 is generated by interpolation from correction data corresponding to the wide end and correction data corresponding to the tele end, and an input image is generated based on the generated correction data. You may correct the data.

(Modification 3)
In the above embodiment, the display surface of the liquid crystal panel 12 is divided into four regions R1 to R4 having three concentric circles with radii r1, r2, and r3 with the center point C as the center. It is not limited. The shape and number of regions for dividing the display surface may be changed according to the characteristics of image quality unevenness caused by the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14, the capacity of the correction data storage unit 153, and the like. More specifically, the shape of the area that divides the display surface is included in each area when the pixel data of each pixel of the liquid crystal panel 12 is the same according to the characteristics of the liquid crystal panel 12 and the characteristics of the optical system 14. The difference in image quality (for example, luminance) of the pixels to be displayed may be determined to be as small as possible, and the number of regions for dividing the display surface may be determined according to the capacity of the correction data storage unit 153 that stores correction data.

  FIG. 13 is a diagram showing another example of luminance unevenness of the display surface of the liquid crystal panel 12 visually recognized through the optical system, and FIG. 14 is a diagram showing another example of division of the display surface of the liquid crystal panel 12. . As in FIG. 4A, FIG. 13 shows the state of the liquid crystal panel 12 visually recognized by the user through the optical system 14 when the pixel data of all the pixels of the liquid crystal panel 12 is set to pixel data designating the same intermediate gradation. The brightness of the display surface is shown in shades of gray. The darker the gray part, the closer the visible brightness is to the brightness specified by the pixel data, and the lighter the gray part, the brightness specified by the pixel data. Also indicates that the visible luminance is high. In the example shown in FIG. 13, when the pixel data of all the pixels of the liquid crystal panel 12 is set to pixel data designating the same intermediate gradation, the luminance of the display surface of the liquid crystal panel 12 visually recognized by the user through the optical system 14 is In the direction along the short side of the display surface, the luminance is higher than the luminance specified by the pixel data as the distance from the center line L increases in the direction along the long side of the display surface. Yes. In this case, as shown in FIG. 14, when the display surface of the liquid crystal panel is divided into rectangular regions R1 to R5 each divided by a plurality of straight lines extending in the short side direction of the display surface, which is a direction with less luminance unevenness. Good. Here, the symmetric region with respect to the center line L in the direction along the long side is the same region. That is, in the example of FIG. 14, each pixel constituting the display surface of the liquid crystal panel 12 belongs to one of the regions R1 to R5 according to the distance in the direction along the long side from the center line L. By such division, for example, the difference in luminance of the pixels included in each of the regions R1 to R5 is smaller than when the display surface is divided into a plurality of regions by a boundary line along the long side direction of the display surface. . If the difference in luminance of the pixels included in each of the regions R1 to R5 is small, the correction is excessive or insufficient even if the pixel value is corrected using the same conversion data for the pixels in each of the regions R1 to R5. It is hard to produce the pixel which becomes. In the example of FIG. 14, the area is divided into five areas R <b> 1 to R <b> 5. However, the area is divided into more than five areas or less than five areas according to the capacity of the correction data storage unit 153. May be.

(Modification 4)
In the above embodiment, the liquid crystal panel 12 is used as the display unit of the EVF 10, but the present invention is not limited to this. For example, an organic EL panel using an organic EL (Electro-Luminescence) element may be used as the display unit.

(Modification 5)
In the above embodiment, a conversion table (gamma curve) that associates an input pixel value with an output pixel value is stored in the correction data storage unit as conversion data for converting an input pixel value into an output pixel value. It is not limited. For example, when the output pixel value is Py and the input pixel value is Px, when the output pixel value Py is expressed as a linear function of the input pixel value Px as Py = a · Px + b, the coefficient a , B may be stored in the correction data storage unit. However, when the gamma curve is used, the degree of freedom in associating the input pixel value with the output pixel value is large.

DESCRIPTION OF SYMBOLS 1 ... Digital camera, 2 ... Main body, 3 ... Shutter button, 4 ... Power switch, 5 ... Touch panel, 10 ... EVF, 11 ... Housing, 12 ... Liquid crystal panel, 13 ... Backlight, 14 ... Optical system, 15 ... Control part , 16 ... contact point, 20 ... attachment lens, 21 ... memory, 151, ... image data acquisition unit, 152 ... image data correction unit, 153 ... correction data storage unit, 154 ... correction data selection unit, 155 ... lens information reading unit, 2100 ... Projector, 2102 ... Lamp unit, 2106 ... Mirror, 2108 ... Dichroic mirror, 2112 ... Dichroic prism, 2114 ... Projection lens group, 2120 ... Screen, 2121 ... Relay lens system, 2122 ... Incident lens, 2123 ... Relay lens, 2124 ... Exit lens, 100R, 100 , 100B ... light bulb

Claims (6)

A display unit for displaying an image based on the image data;
An optical system disposed to face the display unit;
An electro-optical device, comprising: an image data correction unit that corrects input image data according to characteristics of the display unit and characteristics of the optical system, and outputs the corrected image data to the display unit. In accordance with the characteristics of the display unit and the characteristics of the optical system, region definition data for defining the plurality of regions to divide the display surface of the display unit into a plurality of regions is associated with each region of the display unit. A data storage unit for storing the converted data,
The image data correction unit refers to the region definition data stored in the data storage unit, identifies a region to which each pixel of the display unit belongs from the plurality of regions, and is included in the input image data The input image data is corrected by converting the gradation value of the pixel to be corrected to a corrected gradation value based on the conversion data associated with the specified region. The electro-optical device according to claim 1. 3. The electricity according to claim 2, wherein the conversion data includes a conversion table that associates a gradation value included in the input image data with a gradation value included in the corrected image data. Optical device. The input image data includes image data for each color of RGB,
The conversion data is a gradation value included in the image data for a dominant color, which is the color that most affects the luminance unevenness of the display unit visually recognized by the user through the optical system. , Including a conversion table that correlates to the corrected gradation value,
The electro-optical device according to claim 2, wherein the image data correction unit corrects the image data for the dominant color based on the conversion table for the dominant color. The optical system can be attached with an attachment lens,
The data storage unit stores a plurality of correction data each including the region definition data and the conversion data,
The electro-optical device selects one of a plurality of correction data stored in the data storage unit according to the characteristic of an attachment lens attached to the optical system and supplies the correction data to the image data correction unit The electro-optical device according to claim 2, wherein the electro-optical device includes a portion. A lens information reading unit that reads lens information held in a lens information holding unit of the attachment lens;
The correction data selection unit selects one of a plurality of correction data stored in the data storage unit based on the lens information read by the lens information reading unit. The electro-optical device described.