JP2010091985A - Image display device and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device achieving a power saving effect without causing degradation in visibility, particularly under strong external light in the open air or the like, and to provide an image display method with the effect. <P>SOLUTION: The image display method includes: a step (S102) in which the ambient brightness of a display panel 7 is detected by a brightness sensor 10, and when the detected ambient brightness of the display panel 7 is darker than a specified brightness, a thinning rate of image signals obtained through an imaging device 2 is decreased; and a step (S103) in which, when the ambient brightness of the display panel 7 is brighter than the specified brightness, the thinning rate of image signals obtained through the imaging device 2 is increased. Since visibility is hardly influenced under strong external light even when display is performed based on an image signal in a smaller number of pixels than the number of display pixels of the display panel 7, a power saving effect can be obtained without degrading the visibility under strong external light. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display apparatus and an image display method for displaying an image, and more particularly to an image display apparatus often used under strong external light such as outdoors and an image display method in such an image display apparatus.

  In general, a digital camera is provided with a display panel such as a liquid crystal panel on the back, for example, so that an image obtained by photographing can be confirmed on the spot. In addition, many digital cameras have a live view (also referred to as a through image display) function using such a display unit. The live view function is a function for displaying images sequentially obtained by continuously operating the image sensor on the display panel in real time. If such a live view function is performed before photographing, it is possible to perform framing of a subject without using an optical finder.

  By the way, it is known that the visibility of a display panel changes according to the brightness around the display panel. For example, the visibility of the display panel deteriorates under strong external light such as outdoors. As a technique for improving the visibility deterioration of the display panel in the outdoors, a technique for increasing the display brightness of the display panel according to the ambient brightness of the display panel is known. For example, when the display panel is a liquid crystal panel, the current to be supplied to the backlight is increased when the surrounding brightness is bright. This improves the visibility of the display panel. However, increasing the current flowing to the backlight increases the power consumption.

In order to suppress the increase in power consumption while improving the deterioration of visibility under strong external light such as outdoors, in Patent Document 1, the emission luminance of the backlight with respect to the average luminance level of the image as the feature amount of the image is described. The characteristics are changed according to the brightness around the display panel. As a result, the backlight can emit light with the light emission luminance corresponding to the image and the ambient brightness of the display panel, and power saving can be achieved.
JP 2007-241236 A

  The method of Patent Literature 1 obtains a power saving effect by performing display with an appropriate backlight emission luminance according to the image feature amount and the ambient brightness. Here, in the method of Patent Document 1, when the brightness around the display panel is very large, it is necessary to increase the light emission luminance of the backlight regardless of the feature amount of the image. That is, with the method of Patent Document 1, there is a possibility that a sufficient power saving effect cannot be obtained under strong external light such as outdoors where power consumption is greatest.

  The present invention has been made in view of the above circumstances, and an image display device and such an image display method capable of obtaining a power saving effect without causing deterioration of visibility, particularly under strong external light, such as outdoors. The purpose is to provide.

  In order to achieve the above object, an image display device according to a first aspect of the present invention includes a display image generation unit that generates display image data, and display image data generated by the display image generation unit. Display means for displaying an image on the basis of the above and a photometric means for detecting the brightness of the surroundings of the display means, and the display image generating means has a brightness of the surroundings higher than a predetermined brightness. Generates display image data having a number of pixels smaller than the number of display pixels of the display means, and when the surrounding brightness is darker than a predetermined brightness, the number of pixels larger than the number of display pixels of the display means The display image data is generated.

  In order to achieve the above object, an image display method according to the second aspect of the present invention includes a step of detecting the ambient brightness of the display unit, and the detected ambient brightness is higher than a predetermined brightness. If the ambient brightness is darker than a predetermined brightness, display image data with a pixel number smaller than the display pixel number of the display unit is generated. The method includes a step of generating display image data having a large number of pixels and a step of displaying an image on the display unit based on the display image data.

  According to the present invention, it is possible to provide an image display device and such an image display method capable of obtaining a power saving effect without causing deterioration of visibility, particularly under strong external light outdoors.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration of a digital camera as an example of an image display apparatus according to an embodiment of the present invention. A digital camera shown in FIG. 1 includes a lens 1, an image sensor 2, an image pickup circuit 3, a CPU 4, a frame memory 5, a display panel drive circuit 6, a display panel 7, a backlight control circuit 8, and a backlight. It has a light 9, a brightness sensor 10, and a removable memory 11.

  The lens 1 is an imaging optical system for forming an image of a subject (not shown) on the light receiving surface of the imaging device 2. The imaging device 2 has a light receiving surface in which a plurality of pixels that convert a subject image into an electrical signal are arranged two-dimensionally, and converts the subject image formed through the lens 1 into an electrical signal. . For example, a CCD (Charge Coupled Device) type image pickup device can be used as the image pickup device 2, but a CMOS (Complementary Metal-oxide Semiconductor) type image pickup device can also be used.

  The imaging circuit 3 controls the driving of the imaging device 2 according to the control of a CPU (Central Processing Unit) 4 and performs various operations on electrical signals read from the imaging device 2 (hereinafter referred to as image signals). Apply analog processing. As this analog processing, for example, CDS (Correlated Double Sampling) for removing reset noise included in the image signal output from the image sensor 2 and the image signal output from the image sensor 2 AGC (Automatic Gain Control) or the like for adjusting the level is included. Furthermore, the imaging circuit 3 also performs a process of digitizing the image signal subjected to each analog process.

  The CPU 4 performs operation control of the entire digital camera, such as operation control of the imaging circuit 3, operation control of the display panel drive circuit 6, and operation control of the backlight control circuit 8. Further, the CPU 4 in the present embodiment also has a function as display image generation means, and processes the image signal input from the imaging circuit 3 to generate display image data. Further, the CPU 4 generates image data for recording by performing image processing (compression processing or the like) for recording on the image signal obtained via the imaging circuit 3 when capturing a still image, and generates the recording image Processing for recording the image data in the removable memory 11 is also performed.

  The frame memory 5 having a function as a storage unit is a memory for storing various digital data such as an image signal obtained through the imaging circuit 3.

  The display panel drive circuit 6 causes the display panel 7 to display an image according to the display image data generated by the CPU 4 based on the image signal obtained by the imaging circuit 3 and the recording image data recorded in the removable memory 11. The display panel 7 having a function as a display unit is a display panel made of, for example, an LCD (liquid crystal display). The display panel 7 is driven by the display panel drive circuit 6 and is used as a monitor for displaying an image expressed by display image data generated by the CPU 4. A backlight control circuit 8 having a function as illumination control means controls the light emission luminance of the backlight 9. The backlight 9 having a function as an illuminating unit is a light source for irradiating the display panel 7 made of LCD with light.

  The brightness sensor 10 having a function as a photometric means is an optical sensor composed of, for example, a semiconductor element for detecting the brightness of external light. FIG. 2 is a rear view of the digital camera shown in FIG. As shown in FIG. 2, the brightness sensor 10 is disposed in the vicinity of the display panel 7, and in particular, the ambient brightness of the display panel 7 can be detected. The brightness information detected by the brightness sensor 10 is input to the CPU 4.

  The detachable memory 11 is a recording medium composed of a memory that is detachably attached to the camera, and records image data for recording obtained through the image sensor 2 and processed by the CPU 4. Here, the removable memory 11 is used as a recording medium for recording image data. However, a removable memory may not necessarily be used as a recording medium.

  Next, the operation of the digital camera configured as described above will be described. First, the concept of operation of the digital camera according to the present embodiment will be described. FIG. 3 is a diagram showing experimental results on the relationship between the quality of visibility at the brightness equivalent to the outdoors and the resolution of the display panel by the present applicant. Note that “visibility” in this experiment indicates the ease of framing, that is, the ease of confirming the subject displayed on the display panel 7 of the digital camera. Further, in the experiment, in an outdoor environment (illuminance of about 100000 lx), which is more visible is a display with the same resolution as the display pixel number of the display panel 7 or a display with a resolution lower than the display pixel number of the display panel 7. It was done by surveying 81 people to see if it was good.

  FIG. 3A is a diagram showing a questionnaire result. As shown in FIG. 3A, the number of people who answered that the display with the lower resolution than the number of display pixels of the display panel 7 had better visibility was 26 (32%). 21 people (26%) answered that the display with the same resolution had better visibility, and 34 people (42%) responded that both were unchanged. FIG. 3 (b) shows the result of FIG. 3 (a) in a pie chart. As shown in FIG. 3 (b), almost half of the total respondents answered that neither of them changed, and the display with a resolution lower than the number of display pixels of the display panel 7 said that the visibility was better. The number of people who answered that the display with the same resolution as the number of display pixels on the display panel 7 is better in visibility is about the same ratio.

  From the above experimental results, it can be seen that the resolution of the display panel hardly affects the visibility under strong external light. Based on this result, in the present embodiment, the display panel 7 performs low-resolution display under strong external light, thereby reducing the load on the imaging circuit 3 and the CPU 4 to save power.

  FIG. 4 is a flowchart showing processing in the live view mode of the digital camera as a first example of the image display method of the present embodiment based on the above-described concept. Note that the processing in FIG. 4 is an example in which power saving is achieved by processing by the imaging circuit 3.

  When the power of a digital camera (not shown) is turned on, the operation mode of the digital camera shifts to the live view mode, and the process of FIG. 4 is started. Note that if the user gives an instruction to execute still image shooting during the operation of the live view mode, the CPU 4 executes still image shooting processing. This still image shooting process is the same as in the prior art, and a description thereof will be omitted.

  When the processing of FIG. 4 is started, the CPU 4 sends an instruction to the backlight control circuit 8 to turn on the backlight 9. Thereafter, the CPU 4 determines whether or not the output of the brightness sensor 10 is smaller than a predetermined threshold value (for example, equivalent to 1000000 lx) indicating under strong external light (step S101).

  When the output of the brightness sensor 10 is smaller than the predetermined threshold in the determination in step S101, the CPU 4 operates the image sensor 2 and outputs a predetermined pixel whose output from the image sensor 2 is larger than the number of display pixels of the display panel 7. An instruction to thin out the number is sent to the imaging circuit 3 (step S102). When the output of the brightness sensor 10 is equal to or greater than a predetermined threshold in the determination in step S101, the CPU 4 operates the image sensor 2 and outputs the image sensor 2 with a predetermined number less than the number of display pixels of the display panel 7. An instruction to thin out the number of pixels is sent to the imaging circuit 3 (step S103). In response to the instruction in step S102 or step S103, the image pickup circuit 3 operates the image pickup element 2 and thins out the image signal obtained through the image pickup element 2 to a signal corresponding to the number of pixels instructed by the CPU 4. The image signal is output to the frame memory 5 via the CPU 4. The thinning method includes various methods such as pixel addition (also referred to as pixel mixing) in which image signals corresponding to pixels of the same color are added every predetermined number of pixels, or a method of simply thinning out a predetermined number of pixels. Can be considered.

  Next, the CPU 4 reads out the image signal stored in the frame memory 5 and performs image processing such as white balance correction and gradation conversion to generate display image data, and the generated display image data is stored in the frame memory. Write back to 5 (step S104). Thereafter, the CPU 4 sends an instruction for executing image display to the display panel drive circuit 6 in order to start image display for the live view mode. In response to this, the display panel drive circuit 6 reads the display image data written in the frame memory 5 via the CPU 4 and outputs the read display image data to the display panel 7 (step S105).

  Thereafter, the display panel 7 displays an image based on the display image data (step S106). The number of pixels of the display image data when the output of the brightness sensor 10 is darker than the predetermined threshold is larger than the number of display pixels of the display panel 7, and the display when the output of the brightness sensor 10 is brighter than the predetermined threshold. The number of pixels of the image data for use is smaller than the number of display pixels of the display panel 7. Therefore, the display panel 7 performs processing for assigning (mapping) display image data to each display pixel prior to image display. When the number of pixels of the display image data is larger than the number of display pixels of the display panel 7, the display image data is thinned out. On the other hand, when the number of pixels of the display image data is smaller than the number of display pixels of the display panel 7, the display image data is interpolated. As the interpolation method, a method of generating and mapping a pixel corresponding to the average value of display image data at a plurality of adjacent pixel positions, a method of mapping the same pixel as the adjacent pixel, and the like can be considered.

  After the image display, the CPU 4 determines whether or not the power of the digital camera is turned off (step S107). If it is determined in step S107 that the digital camera is not turned off, the process returns to step S101. In this case, the operation in the live view mode is continued. On the other hand, when the digital camera is turned off in the determination in step S107, the CPU 4 turns off the digital camera.

  In the first example described above, the thinning-out rate of the output of the image pickup device 2 by the image pickup circuit 3 is changed according to the output of the brightness sensor 10. That is, under strong external light, the fact that display is performed based on display image data having a smaller number of pixels than the number of display pixels of the display panel 7 has almost no effect on visibility. The thinning-out rate of the output of the image pickup device 2 by the image pickup circuit 3 is increased. For this reason, the load for transferring the image signal from the imaging circuit 3 to the CPU 4, the load for generating the display image data in the CPU 4, and the load for transferring the display image data from the CPU 4 to the display panel drive circuit 6 are reduced. Thus, it is possible to save power.

  FIG. 5 is a flowchart showing processing in the live view mode of the digital camera as a second example of the image display method of the present embodiment. Note that the processing of FIG. 5 is an example in which power saving is achieved by processing by the CPU 4.

  When the power of a digital camera (not shown) is turned on, the operation mode of the digital camera shifts to the live view mode, and the process of FIG. 5 is started. When the processing of FIG. 5 is started, the CPU 4 sends an instruction to the imaging circuit 3 to operate the imaging device 2. At this time, the CPU 4 sends an instruction to the backlight control circuit 8 to light the backlight 9. Upon receiving an instruction from the CPU 4, the imaging circuit 3 operates the imaging device 2, and outputs an image signal obtained via the imaging device 2 to the frame memory 5 via the CPU 4 (step S201).

  Here, although an example in which the output of the image sensor 2 is not thinned out is shown in step S201, the output of the image sensor 2 may be thinned out in step S201. However, when thinning is performed, the number of pixels after thinning is set to be larger than the number of display pixels of the display panel 7. This is to prevent a decrease in resolution in display when not under strong external light.

  Next, the CPU 4 determines whether or not the output of the brightness sensor 10 is smaller than a predetermined threshold value (for example, equivalent to 1000000 lx) indicating under strong external light (step S202). If it is determined in step S202 that the output of the brightness sensor 10 is smaller than the predetermined threshold, the CPU 4 reads the image signal stored in the frame memory 5 and performs image processing such as white balance correction and gradation conversion. Thus, display image data having a predetermined number of pixels larger than the number of display pixels of the display panel 7 is generated, and the generated display image data is written back to the frame memory 5 (step S203). On the other hand, if it is determined in step S202 that the output of the brightness sensor 10 is equal to or greater than the predetermined threshold, the CPU 4 reads the image signal stored in the frame memory 5 and performs image processing such as white balance correction and gradation conversion. After that, display image data is generated by thinning out to a predetermined number of pixels smaller than the number of display pixels of the display panel 7, and the generated display image data is written back to the frame memory 5 (step S204).

  Thereafter, the CPU 4 sends an instruction for executing image display to the display panel drive circuit 6 in order to start image display for the live view mode. In response to this, the display panel drive circuit 6 reads the display image data written in the frame memory 5 via the CPU 4 and outputs the read display image data to the display panel 7 (step S205).

  Thereafter, the display panel 7 displays an image based on the display image data (step S206). Also in step S206, as in the case of the first example described above, the display panel 7 performs a process of assigning (mapping) display image data to each display pixel prior to image display.

  After the image display, the CPU 4 determines whether or not the digital camera is turned off (step S207). If it is determined in step S207 that the digital camera is not turned off, the process returns to step S201. In this case, the operation in the live view mode is continued. On the other hand, when the digital camera is turned off in the determination in step S207, the CPU 4 turns off the digital camera.

  In the second example described above, the number of pixels of the display image data generated by the CPU 4 is changed according to the output of the brightness sensor 10. That is, the display image data is transferred from the CPU 4 to the display panel drive circuit 6 because the number of pixels of the display image data generated by the CPU 4 is less than the number of display pixels of the display panel 7 under strong external light. Load can be reduced, which can save power.

  Here, in the first example of the image display method of the present embodiment, an example in which power saving is achieved by changing the thinning rate in the imaging circuit 3 in accordance with the brightness of external light will be described. In the second example of the method, an example is described in which power saving is achieved by changing the number of pixels of display image data generated by the CPU 4 in accordance with the brightness of external light. In addition, the display image data generated in the CPU 4 may be thinned out in the display panel drive circuit 6 to save power.

  Next, a third example of the image display method according to the present embodiment will be described. The first example and the second example described above are examples describing power saving in the live view mode. In contrast, the third example is an example of power saving when reproducing the recording image data recorded in the removable memory 11.

  At the time of image reproduction, the CPU 4 reads the recording image data from the detachable memory 11, performs image processing for reproduction (such as expansion processing) on the read recording image data, and generates display image data. . In the third example, power saving is achieved by further thinning display image data generated for reproduction according to the brightness of external light.

  The third example is the same as the second example except that display image data for reproduction is generated based on the recording image data recorded in the removable memory 11. Therefore, description of the details of the processing is omitted.

  Next, a fourth example of the image display method according to the present embodiment will be described. Depending on the configuration of the digital camera, the display panel drive circuit 6 may have a CPU. In this case, at the time of image reproduction, an image based on the recording image data recorded in the removable memory 11 can be displayed on the display panel 7 without using the CPU 4. The fourth example is an example of power saving at the time of reproducing an image of the digital camera having such a configuration.

  FIG. 6 is a diagram illustrating a configuration of a digital camera according to the fourth example. In FIG. 5, the same components as those in FIG. 1 are denoted by the same reference numerals as those in FIG. As shown in FIG. 6, the digital camera according to the fourth example is provided with a CPU 6 a in the display panel drive circuit 6, and the recording for which the CPU 6 a is recorded in the removable memory 11 without the CPU 4. 1 is different from FIG. 1 in that image data can be read out.

  The CPU 6 a is a CPU that performs control when reproducing the recording image data, and has at least a function of generating display image data from the recording image data recorded in the removable memory 11.

  FIG. 7 is a flowchart showing processing at the time of image reproduction of the digital camera as a fourth example of the image display method of the present embodiment.

  When the user selects a playback image to be displayed on the display panel 7, the process in FIG. 7 is started. When the processing of FIG. 7 is started, the CPU 6a reads out the recording image data corresponding to the reproduced image selected by the user from the removable memory 11 (step S301). Next, the CPU 6a acquires the output of the brightness sensor 10. The output of the brightness sensor 10 is acquired by communication with the CPU 4, for example. Of course, the CPU 6a may directly acquire the output of the brightness sensor 10. After acquiring the brightness sensor 10, the CPU 6a determines whether or not the output of the brightness sensor 10 is smaller than a predetermined threshold value (for example, equivalent to 1000000 lx) indicating under strong external light (step S302). When the output of the brightness sensor 10 is smaller than the predetermined threshold value in the determination in step S302, the CPU 6a performs image processing such as expansion processing on the acquired recording image data to thereby display the number of display pixels on the display panel 7. The display image data having a predetermined number of pixels larger than that is generated, and the generated display image data is output to the display panel 7 (step S303). On the other hand, if it is determined in step S302 that the output of the brightness sensor 10 is equal to or greater than a predetermined threshold value, the CPU 6a performs image processing such as expansion processing on the acquired recording image data, and then displays on the display panel 7. Display image data is generated by thinning to a predetermined number of pixels smaller than the number of pixels, and the generated display image data is output to the display panel 7 (step S304).

  Thereafter, the display panel 7 displays an image based on the display image data (step S305). Also in step S305, as in the case of the first and second examples described above, the display panel 7 performs a process of assigning (mapping) display image data to each display pixel prior to image display. Do.

  After the image display, the image reproduction is continued until the user instructs the end of the image reproduction. When the end of image reproduction is instructed, the operation proceeds to the live view mode.

  In the above fourth example, at the time of image reproduction, the CPU 6a in the display panel drive circuit 6 performs processing such as generation of display image data for reproduction and thinning of the display image data for power saving. It is possible to reduce the load.

  In the fourth example, the CPU 6a is described to operate only during image reproduction. However, it is needless to say that the CPU 6a may generate display image data in the live view mode. .

  Although the present invention has been described above based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications and applications are naturally possible within the scope of the gist of the present invention.

  For example, as a technique for improving the visibility of the display panel 7, a technique for increasing the light emission luminance of the backlight 9 according to the brightness of external light is known. You may make it use combining this technique and the technique of this embodiment mentioned above. That is, when the external light is brighter than the predetermined brightness, the light emission luminance of the backlight 9 may be increased while reducing the display resolution.

  In the above-described example, only one threshold for determining the brightness of external light is used. However, a plurality of determination thresholds are set, and the display resolution is changed in a plurality of stages according to the brightness of external light. You can make it. Further, the resolution at the time of display may be continuously changed according to the brightness of outside light without setting the determination threshold.

  Furthermore, in the above-described example, a digital camera is cited as an example of an image display device. However, the technology of the present embodiment is applicable to various image display devices that may be used under strong external light, such as mobile phones. Applicable. Moreover, although the example which the display panel 7 is a liquid crystal panel is shown in the example mentioned above, the display panel 7 does not need to be a liquid crystal panel in the technique of this embodiment. For example, it is possible to apply the technique of the present embodiment to an image display device having an organic EL (Organic Electro Luminescence) panel.

  In addition, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some configuration requirements are deleted from all the configuration requirements shown in the embodiment, the above-described problem can be solved, and this configuration requirement is deleted when the above-described effects can be obtained. The configuration can also be extracted as an invention.

It is a figure which shows the structure of the digital camera as an example of the image display apparatus which concerns on one Embodiment of this invention. It is a rear view of the digital camera shown in FIG. It is the figure which showed the experimental result about the relationship between the quality of the visibility in the brightness equivalent to the outdoors, and the resolution of a display panel. It is the flowchart shown about the process at the time of the live view mode of a digital camera as a 1st example of the image display method of one Embodiment of this invention. It is the flowchart shown about the process at the time of the live view mode of a digital camera as a 2nd example of the image display method of one Embodiment of this invention. It is a figure which shows the structure of the digital camera which concerns on the 4th example of the image display apparatus which concerns on one Embodiment of this invention. It is the flowchart shown about the process at the time of the image reproduction of a digital camera as the 4th example of the image display method of one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lens, 2 ... Imaging device, 3 ... Imaging circuit, 4 ... CPU, 5 ... Frame memory, 6 ... Display panel drive circuit, 6a ... CPU, 7 ... Display panel, 8 ... Backlight control circuit, 9 ... Backlight 10 ... Brightness sensor, 11 ... Removable memory

Claims (7)

Display image generation means for generating display image data;
Display means for displaying an image based on the display image data generated by the display image generation means;
Photometric means for detecting brightness around the display means;
Comprising
The display image generating means generates display image data having a number of pixels smaller than the number of display pixels of the display means when the ambient brightness is brighter than a predetermined brightness, and the ambient brightness is An image display device characterized by generating display image data having a number of pixels larger than the number of display pixels of the display means when darker than a predetermined brightness. It further comprises storage means for storing image data,
2. The image according to claim 1, wherein the display image generating unit generates the display image data based on image data obtained by performing a thinning process on the image data stored in the storage unit. Display device. It further comprises an imaging means having an imaging device in which a plurality of pixels are arranged two-dimensionally,
2. The image according to claim 1, wherein the display image generation unit generates the display image data based on an image signal read out by thinning out an image signal from each pixel of the image sensor. Display device.   The display means adjusts the number of display image data having a smaller number of pixels than the number of display pixels of the display means generated by the display image generation means to the display pixel number of the display means by interpolation. The image display device according to claim 1, wherein display is performed.   The display means has a brightness of an image displayed on the display means when the ambient brightness is brighter than the predetermined brightness compared to when the ambient brightness is darker than the predetermined brightness. The image display device according to claim 1, wherein the image display device is controlled to be bright. The display means is for displaying an image on a liquid crystal panel, and
Illumination means for illuminating the liquid crystal panel;
When the ambient brightness is brighter than the predetermined brightness, the brightness of the illumination means is controlled so that the illumination means is brighter than when the ambient brightness is darker than the predetermined brightness. Lighting control means,
The image display apparatus according to claim 5, further comprising: Detecting the brightness around the display;
When the detected ambient brightness is brighter than a predetermined brightness, display image data having a smaller number of pixels than the number of display pixels of the display unit is generated, and the ambient brightness is lower than the predetermined brightness. When it is dark, generating display image data having a larger number of pixels than the number of display pixels of the display unit;
Displaying an image on the display unit based on the display image data;
An image display method characterized by comprising:

Images