Display device, photoelectric conversion device, electronic device, lighting device, mobile object, and wearable device

Abstract

To provide a technique advantageous for natural switching of display modes in a display.SOLUTION: A display includes a scanning circuit that scans a pixel array in which a plurality of pixels is arranged in a matrix shape, and a control circuit that controls the scanning circuit to scan the pixel array according to a display mode selected from a plurality of display modes. The plurality of display modes includes a first display mode for repeating an operation unit composed of a plurality of scanning sequences including a first scanning sequence in which the scanning circuit scans a predetermined scan line in the pixel array in a predetermined order. When making transition from a display mode other than the first display mode of the plurality of display modes to the first display mode, the control circuit controls the scanning circuit to start the operation unit from the first scanning sequence.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a display device, a photoelectric conversion device, an electronic device, a lighting device, a moving object, and a wearable device. [Background technology]

[0002] In display devices such as liquid crystal displays and organic EL displays, it is necessary to increase the frame rate in order to improve the quality of images displayed. Patent Document 1 shows that a scanning method like an interlace method can be realized by simultaneously driving multiple scanning lines in one horizontal line period, thereby increasing the frame rate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-271365 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is necessary to reduce power consumption in a display device when continuously displaying images, such as in a camera's electronic viewfinder (EVF). When the frame rate is increased in image display, power consumption may increase. In order to reduce power consumption, it is possible to switch the display mode for displaying images, such as by lowering the frame rate according to the image quality of the image to be displayed. When switching the display mode, it is desirable to switch the display mode without making the user feel unnatural.

[0005] An object of the present invention is to provide a technique that is advantageous for natural switching of display modes in a display device. [Means for solving the problem]

[0006] In view of the above problems, a display device according to an embodiment of the present invention includes a scanning circuit that scans a pixel array in which a plurality of pixels are arranged in a matrix, and a control circuit that controls the scanning circuit to scan the pixel array in accordance with a display mode selected from a plurality of display modes, the plurality of display modes including a first display mode in which the scanning circuit repeats an operation unit constituted by a plurality of scan sequences including a first scan sequence in which the scanning circuit scans a predetermined scan line of the pixel array in a predetermined order, and when transitioning to the first display mode from a display mode other than the first display mode among the plurality of display modes, the control circuit repeats the operation unit from the first scan sequence. and further including a count unit that counts a synchronization signal, and in the first display mode, the control circuit controls a scan sequence in which the scanning circuit scans the pixel array, among the plurality of scan sequences, based on a result of the counting of the synchronization signal by the count unit, and the count unit starts counting from a reset state when a transition is made from a display mode other than the first display mode, among the plurality of display modes, to the first display mode. The scanning circuit is controlled so as to Effect of the Invention

[0007] According to the present invention, it is possible to provide a technique that is advantageous for natural switching of display modes in a display device. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an outline of a display system including a display device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram showing a configuration example of a display unit of the display device in FIG. [Diagram 3] 2 is a diagram showing an example of the operation of an image processing unit of the display device in FIG. 1; [Figure 4] 2 is a diagram showing an example of the operation of a scanning circuit of the display device in FIG. [Diagram 5] 2 is a diagram showing an example of the operation of a scanning circuit of the display device in FIG. [Figure 6] 2 is a timing chart showing an example of the operation of the display device in FIG. 1; [Figure 7] 2 is a block diagram showing an example of the configuration of a scan sequence control circuit of the display device of FIG. 1; [Figure 8] 2 is a timing chart showing an example of the operation of the display device in FIG. 1; [Figure 9] 2 is a diagram showing an example of the operation of an image processing unit of the display device in FIG. 1; [Figure 10] 2 is a diagram showing an example of the operation of a scanning circuit of the display device in FIG. [Figure 11] 2 is a block diagram showing an example of the configuration of a scan sequence control circuit of the display device of FIG. 1; [Figure 12] 2 is a timing chart showing an example of the operation of the display device in FIG. 1; [Figure 13] 2A to 2C are diagrams showing application examples of the display device in FIG. 1; [Figure 14] FIG. 2 is a diagram showing an example of a photoelectric conversion device using the display device in FIG. [Figure 15] 2A to 2C are diagrams illustrating examples of electronic devices using the display device in FIG. 1. [Figure 16] FIG. 2 is a diagram showing an example of a display device using the display device in FIG. [Figure 17] FIG. 2 is a diagram showing an example of a lighting device using the display device of FIG. [Figure 18] FIG. 2 is a diagram showing an example of a moving object using the display device of FIG. 1; [Figure 19] FIG. 2 is a diagram showing an example of a wearable device using the display device of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the attached drawings. Note that the following embodiments do not limit the invention according to the claims. Although the embodiments describe a number of features, not all of these features are essential to the invention, and the features may be combined in any manner. Furthermore, in the attached drawings, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0010] A display device according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 12. FIG. 1 is a diagram showing an outline of a display system SYS including a display device 50 in this embodiment. The display system SYS may include an image memory 10, a CPU 20, a synchronization control unit 30, an image processing unit 40, and a display device 50. The display system SYS can be used as a part of an electronic device equipped with a display device 50 that displays an image. Examples of electronic devices including the display system SYS include a digital camera, a smartphone, and a tablet. Image data input to the display system SYS is temporarily stored in the image memory 10. The CPU 20 executes a program stored in a memory (not shown) to realize various processes in the display system SYS. As one of the various processes in the display system SYS, the CPU 20 outputs a signal for switching a display rate to the synchronization control unit 30. In addition, the CPU 20 outputs a signal for switching a display mode to the image processing unit 40 and the display device 50. The synchronization control unit 30 supplies a synchronization signal to the image processing unit 40 according to the display rate specified by the CPU 20. The image processing unit 40 performs predetermined image processing on the image data stored in the image memory 10 at a display rate based on the synchronization signal, and supplies image display data for displaying an image on the pixel array 100 of the display device 50. The display device 50 displays an image at a predetermined display rate and in a predetermined display mode based on the image display data and instructions from the CPU 20. The display device 50 displays an image by switching between a plurality of display modes.

[0011] 2 is a block diagram showing a configuration example of the display device 50. The display device 50 includes a scanning circuit 200 that scans a pixel array 100 in which a plurality of pixels 101 are arranged in a matrix, and a control circuit 300 that controls the scanning circuit 200 to scan the pixel array 100 according to a display mode selected from a plurality of display modes. The display device 50 also includes a control unit 400 that controls various processes in the display device 50. The pixel array 100 may be an organic EL display in which each pixel 101 arranged in the pixel array 100 includes an organic light emitting element (organic EL element). Furthermore, for example, the pixel array 100 may be a liquid crystal display. Various types of displays can be appropriately used as the pixel array 100.

[0012] The scanning circuit 200 is controlled by the control circuit 300 and the control unit 400, and controls the emission of the pixels 101 via the scanning lines 210 provided for each row of the pixel array 100. The scanning circuit 200 may also be called a vertical scanning circuit. The control unit 400 controls the scanning timing of the scanning circuit 200. A display mode control signal specifying a display mode is input from the CPU 20 to the control circuit 300, and the control circuit 300 controls the scanning sequence of the scanning circuit 200 based on the display mode control signal. In the configuration shown in FIG. 2, the control unit 400 and the control circuit 300 are shown as separate entities, but the configuration is not limited to this. For example, the control unit 400 may have the function of the control circuit 300.

[0013] The display device 50 further includes a data processing circuit 500 and a signal output circuit 600. Image display data sent from the image processing unit 40 to the display device 50 is input to the signal output circuit 600 via the data processing circuit 500, which performs predetermined data processing. The signal output circuit 600 is controlled by the control unit 400, and outputs luminance signals, which are analog conversions of the image display data, to the pixels 101 via data lines 610 provided for each column of the pixel array 100. The pixels 101 hold the luminance signals under the control of the scanning circuit 200, and emit light with an amount of light based on the luminance signal.

[0014] The display device 50 displays images in a plurality of display modes as described above. The plurality of display modes includes a display mode A in which the scanning circuit 200 scans predetermined scanning lines 210 in the pixel array 100 in a predetermined order, for example, one by one of the scanning lines 210 arranged in the pixel array 100 so as to display one image per frame at a predetermined frame rate. A representative example of the display mode A is a progressive method. The plurality of display modes also includes a display mode B in which an image of one frame is divided into two fields, an odd field and an even field, and an operation unit consisting of a plurality of scanning sequences including a scanning sequence for scanning the odd field and a scanning sequence for scanning the even field is repeated at a predetermined field rate. A representative example of the display mode B is an interlace method. Here, the display rate in this specification refers to the frame rate in the display mode A, and refers to the field rate in the display mode B.

[0015] Next, the operation of the image processing unit 40 of the display system SYS will be described. The image processing unit 40 generates different image display data according to each of a plurality of display modes. For example, the image processing unit 40 operates in a plurality of image processing modes including image processing A according to display mode A, image processing B1 and image processing B2 according to display mode B, and generates image display data from image data. When display mode A is selected as the display mode, the image processing unit 40 performs image processing A. When display mode B is selected as the display mode, the image processing unit 40 performs image processing B1 as processing when scanning an odd field, and performs image processing B2 as processing when scanning an even field. In the configuration of the display system SYS shown in FIG. 1, the display device 50 and the image processing unit 40 are shown as separate configurations, but this is not limited to this. The display device 50 may have the function of the image processing unit 40. In other words, the image processing unit 40 may be a component of the display system SYS as well as a component of the display device 50. In other words, the display device 50 and the image processing unit 40 may be collectively referred to as the "display device" in this disclosure.

[0016] 3(a) to 3(d) are diagrams showing an example of image data sent from the image memory 10 to the image processing unit 40 and image display data output from the image processing unit 40 in each image processing mode. As shown in FIG. 3(a), the image data input to the image processing unit 40 is image data of N rows. Here, for ease of explanation, N is a multiple of 2. In the image processing A, the image processing unit 40 outputs data of all rows from the 1st row to the Nth row as image display data, as shown in FIG. 3(b). Therefore, in the image processing A, data identical to the input image data can be output as image display data. On the other hand, in the image processing B1 and the image processing B2, data different from the input image data is output as image display data. In the image processing B1, the image processing unit 40 outputs data obtained by extracting odd-numbered rows, i.e., the 1st row, the 3rd row, the 5th row, . . . , and the N-1th row, of the input image data to the display device 50 as image display data, as shown in FIG. 3(c). Furthermore, in image processing B2, the image processing unit 40 extracts the even rows of the input image data, i.e., the second, fourth, sixth, ..., Nth rows, and outputs them to the display device 50 as image display data, as shown in Figure 3(d).

[0017] Next, the operation of the scanning circuit 200 in each display mode will be described. The scanning circuit 200 scans the pixel array 100 according to a display mode selected from among a plurality of display modes. For example, the scanning circuit 200 operates in three types of scanning sequences, namely, a scanning sequence A, a scanning sequence B1, and a scanning sequence B2, and these scanning sequences are controlled by the control circuit 300.

[0018] When the display mode is display mode A, the scanning circuit 200 scans the pixel array 100 with one (one type) scanning sequence A. When the display mode is display mode B, the scanning circuit 200 repeats an operation unit configured with a scanning sequence B1 for scanning odd fields and a scanning sequence B2 for scanning even fields.

[0019] FIG. 4 is a timing diagram of one frame of the scanning circuit 200 in the scanning sequence A. Here, the pixel array 100 is described as an organic EL display in which an organic EL element is arranged in each pixel 101 arranged in the pixel array 100. At time t10, a synchronization signal is output from the synchronization control unit 30. At time t11 after a predetermined blanking period, the image processing unit 40 outputs image display data to the display device 50. When the image display data is input to the display device 50, the scanning circuit 200 starts writing a luminance signal to the pixel 101 in the first row. Next, at time t12, the scanning circuit 200 completes writing a luminance signal to the pixel 101 in the first row and starts emitting light from the pixel 101 in the first row. Also, at time t12, the scanning circuit 200 starts writing a luminance signal to the pixel 101 in the second row. Thereafter, the scanning circuit 200 writes a luminance signal to the pixel 101 and emits light in the order of the first row, the second row, the third row, ..., and the Nth row. At time t13, when the input of image display data from the image processor 40 to the display device 50 is completed, the scanning circuit 200 completes scanning up to the Nth row, and the pixels 101 corresponding to all rows from the 1st row to the Nth row are in an emitting state. The pixels 101 continue to emit light until the writing of the luminance signal is performed again in the next frame. For example, the pixels 101 in the 1st row that started emitting light at time t12 stop emitting light at time t11 in the next frame, and the luminance signal is written again.

[0020] 5(a) and 5(b) are timing diagrams of one field of the scanning circuit 200 in the scan sequence B1 and the scan sequence B2. FIG. 5(a) shows the timing of scanning in the scan sequence B1, and FIG. 5(b) shows the timing of scanning in the scan sequence B2.

[0021] The scan sequences B1 and B2 scan different rows from the scan sequence A. Therefore, in the display modes A and B, the scanning circuit 200 scans the pixel array 100 in different scan sequences.

[0022] In the scanning sequence B1, the scanning circuit 200 starts scanning from time t11 when image display data is input to the display device 50, and scans odd-numbered rows in the order of 1st row, 3rd row, 5th row, ..., N-1th row. The pixels 101 in the 2nd row, 4th row, 6th row, ..., Nth row (even-numbered rows) to which no luminance signal is written are maintained to emit light according to the luminance signal written in the previous frame. On the other hand, in the scanning sequence B2, the scanning circuit 200 starts scanning from time t11 when image display data is input to the display device 50, and scans even-numbered rows in the order of 2nd row, 4th row, 6th row, ..., Nth row. The pixels 101 in the 1st row, 3rd row, 5th row, ..., N-1th row (odd-numbered rows) to which no luminance signal is written are maintained to emit light according to the luminance signal written in the previous frame.

[0023] In this way, the number of rows scanned in scan sequence B1 and scan sequence B2 is half that of scan sequence A. Therefore, the display rate of display mode B in which scan sequence B1 and scan sequence B2 are performed is higher than the display rate of display mode A in which scan sequence A is performed. For example, display mode B can achieve a display rate that is twice as high as that of display mode A.

[0024] In this embodiment, in display mode B (scanning sequence B1, scanning sequence B2), the scanning circuit 200 improves the display rate by scanning a part of the pixel array 100, but the method of improving the display rate is not limited to this. For example, in scanning sequence B1 and scanning sequence B2, the scanning circuit 200 may improve the display rate by simultaneously scanning multiple rows of the pixel array 100.

[0025] Next, switching of the display mode between display mode A and display mode B in the present disclosure will be described. Fig. 6 is a timing diagram for switching the display mode. Fig. 6 shows the operation of the display device 50 by taking as an example a case where the display rate in display mode A is 60 Hz and the display rate in display mode B is 120 Hz.

[0026] At time t20, the CPU 20 transmits a signal to select a display rate of 60 Hz (display mode A). After the CPU 20 instructs the display mode, from time t21, the synchronization control unit 30 outputs a synchronization signal at 60 Hz intervals. At time t21, when the first synchronization signal is output after the CPU 20 instructs the display mode, the image processing unit 40 executes image processing A corresponding to the display mode A. The control circuit 300 also controls the scanning circuit 200 to operate in the scanning sequence A.

[0027] Subsequently, at time t22, the CPU 20 transmits a signal to select a display rate of 120 Hz (display mode B). After the CPU 20 issues an instruction to change the display mode, the synchronization control unit 30 outputs a synchronization signal at 120 Hz intervals from time t23. At time t23, when the first synchronization signal is output after the CPU 20 issues an instruction to change the display mode, the image processing unit 40 executes image processing B1 according to the display mode B. Furthermore, the control circuit 300 controls the scanning circuit 200 to operate in the scanning sequence B1. At time t24, when the synchronization control unit 30 outputs a synchronization signal next to the synchronization signal at time t23, the image processing unit 40 executes image processing B2. Furthermore, the control circuit 300 controls the scanning circuit 200 to operate in the scanning sequence B2. Thereafter, in response to a synchronization signal output from the synchronization control unit 30, the image processing unit 40 alternately performs the image processing B1 and the image processing B2, and the control circuit 300 causes the scanning circuit 200 to repeatedly alternately perform the scanning sequence B1 and the scanning sequence B2.

[0028] At time t25, the CPU 20 again transmits a signal to select a display rate of 60 Hz (display mode A). After the CPU 20 issues an instruction to change the display mode, the synchronization control unit 30 outputs a synchronization signal at 60 Hz intervals from time t26. At time t26, when the first synchronization signal is output after the CPU 20 issues an instruction to change the display mode, the image processing unit 40 executes image processing A. The control circuit 300 also controls the scanning circuit 200 to operate in the scanning sequence A.

[0029] Furthermore, at time t27, the CPU 20 again transmits a signal to select a display rate of 120 Hz (display mode B). After the CPU 20 issues an instruction to change the display mode, the synchronization control unit 30 outputs a synchronization signal at 120 Hz intervals from time t28. After the image processing unit 40 performs image processing B1, similar to the period from time t23 to time t25, the image processing unit 40 alternately repeats image processing B1 and image processing B2 in response to the synchronization signal after performing image processing B1 from time t28 onwards. Also, the control circuit 300 controls the scanning circuit 200 to start operation in display mode B with the scanning sequence B1, similar to the period from time t23 to time t25. Thereafter, the control circuit 300 causes the scanning circuit 200 to alternately repeat the scanning sequence B1 and the scanning sequence B2 in response to the synchronization signal.

[0030] In this way, when the display device 50 transitions from display mode A to display mode B, the control circuit 300 controls the scanning circuit 200 to start the operation unit consisting of the scanning sequence B1 and the scanning sequence B2 of the display mode B from the scanning sequence B1. In accordance with this, when transitioning from display mode A to display mode B, the image processing unit 40 also always starts from image processing B1, so that a normal odd field image can always be obtained when switching to display mode B. In other words, when switching the display mode, since scanning always starts with the same scanning sequence, it is not necessary to initialize the operation of the image processing unit 40 or the display device 50. For this reason, the image processing unit 40 or the display device 50 is initialized, and the image quality of the image displayed on the pixel array 100 is suppressed from being degraded, such as the display image being interrupted. As a result, the display mode can be switched in the display device 50 without the user feeling unnatural.

[0031] For example, the display device 50 can be used as an electronic view finder (EVF) for a camera's eyepiece finder. Since the EVF needs to operate continuously during shooting, power consumption increases compared to a camera using an optical view finder (OVF). In order to reduce power consumption, for example, it is possible to switch the display rate of the EVF according to the operation state of the shutter button. Specifically, it is possible to reduce power consumption by setting the display rate high when the shutter button is half-pressed and setting the display rate slow when the shutter button is not pressed. If the image displayed on the EVF is interrupted for an instant when the user half-presses the shutter button, the user may feel uncomfortable and miss the shutter opportunity. On the other hand, by using the above-mentioned control, it is possible to switch the display mode without making the user feel unnatural. As a result, it is possible to realize a display device 50 that does not make the user feel uncomfortable when switching the display mode while suppressing power consumption.

[0032] In the above embodiment, the display mode is switched between two display modes, display mode A and display mode B, but the present invention is not limited to this. The display mode may be switched between three or more display modes. In this case, when transitioning from a display mode other than the display mode repeating an operation unit composed of multiple scan sequences among the multiple display modes to a display mode repeating an operation unit composed of multiple scan sequences, the control circuit 300 controls the scanning circuit 200 to start the operation unit composed of multiple scan sequences from the same predetermined scan sequence. This allows natural display mode switching to be realized in the display device 50.

[0033] FIG. 7 is a block diagram showing an example of the configuration of the control circuit 300 of this embodiment. The control circuit 300 includes a display mode synchronization circuit 301 and a 1-bit counter 302 that functions as a counting unit that counts the synchronization signal output from the synchronization control unit 30. A display mode control signal is input from the CPU 20 to the display mode synchronization circuit 301. The display mode synchronization circuit 301 outputs a display mode signal synchronized with the synchronization signal to the scanning circuit 200 based on the display mode control signal. The 1-bit counter 302 outputs the counting result of the synchronization signal as a field signal. The maximum count value of the 1-bit counter 302 is 1. When the counter overflows, the counter starts counting from 0 again. The 1-bit counter 302 is reset and controlled by the display mode control signal. The scanning sequence performed by the scanning circuit 200 is controlled by the display mode signal and the field signal generated by the control circuit 300.

[0034] In addition to the operation timing diagram of FIG. 6, FIG. 8 shows the display mode control signal output by the CPU 20, and the display mode signal and field signal output by the display mode synchronization circuit 301. In the initial state, the display mode synchronization circuit 301 sets the display mode signal to Lo level. At this time, the 1-bit counter 302 is reset, and the field signal becomes Lo level.

[0035] At time t20, when the CPU 20 transmits a signal to select a display rate of 60 Hz (display mode A), the display mode control signal becomes Lo level. After the CPU 20 instructs the display mode, from time t21, the synchronization control unit 30 outputs a synchronization signal at 60 Hz intervals. The display mode synchronization circuit 301 outputs the display mode control signal as a display mode signal in synchronization with the synchronization signal. Here, the display mode signal remains at Lo level in the initial state. When the display mode signal is at Lo level, the scanning circuit 200 executes scanning of the pixel array 100 with the scanning sequence A. Also, in display mode A, the 1-bit counter 302, which is a counting unit, remains in a reset state, and the field signal maintains Lo level.

[0036] Subsequently, at time t22, when a signal for selecting a display rate of 120 Hz (display mode B) is transmitted from the CPU 20, the display mode control signal becomes Hi level. After the instruction from the CPU 20, from time t22, the synchronization control unit 30 outputs a synchronization signal at 120 Hz intervals. The display mode synchronization circuit 301 outputs a display mode control signal to the display mode signal in synchronization with the synchronization signal. Here, it is assumed that the display mode signal becomes Hi level. Accordingly, the reset state of the 1-bit counter 302 is released. When the next synchronization signal is input, the 1-bit counter 302 starts operating. Therefore, the 1-bit counter 302 sets the field signal to Lo level at time t23 and sets the field signal to Hi level at time t24. After that, the 1-bit counter 302 inverts and outputs the field signal every time a synchronization signal is input. That is, the 1-bit counter 302, which is a counting unit, starts counting from the reset state in display mode B. It can also be said that the 1-bit counter 302 is reset when a display mode other than the display mode B among the multiple display modes is shifted to the display mode B. When the display mode signal is at Hi level, the scanning sequence of the scanning circuit 200 is determined based on the field signal. When the field signal is at Lo level, the scanning circuit 200 executes the scanning sequence B1. When the field signal is at Hi level, the scanning circuit 200 executes the scanning sequence B2. Therefore, the scanning circuit 200 operates with the scanning sequence B1 from time t23, and with the scanning sequence B2 from time t24. Thereafter, the scanning circuit 200 repeats the scanning sequence B1 and the scanning sequence B2.

[0037] At time t25, when the CPU 20 again transmits a signal to select a display rate of 60 Hz (display mode A), the display mode control signal becomes Lo level. After the instruction from the CPU 20, from time t26, the synchronization control unit 30 outputs a synchronization signal at 60 Hz intervals. Since the display mode control signal is at Lo level, the display mode synchronization circuit 301 sets the display mode signal to Lo level. Therefore, the scanning circuit 200 executes the scanning sequence A. Also, the 1-bit counter 302 is reset at time t26, and the field signal becomes Lo level.

[0038] At time t27, when the CPU 20 again transmits a signal to select a display rate of 120 Hz (display mode B), the display mode control signal becomes Hi level. In response to this, the control circuit 300 operates in the same manner as it did after time t23. That is, in display mode B in which the 1-bit counter 302 operates from the reset state and an operation unit made up of a plurality of scan sequences including scan sequence B1 and scan sequence B2 is repeated, the scanning circuit 200 starts scanning the pixel array 100 from scan sequence B1.

[0039] As described above, by using the control circuit 300, the display device 50 can always start the scan sequence from the scan sequence B1 in synchronization with the synchronization signal when switching to the display mode B in which two scan sequences are repeated as one operation unit. In addition, the image processing unit 40 can also start the operation in the display mode B from the image processing B1, so that a normal odd field image can always be obtained when switching to the display mode B. As a result, it is not necessary to initialize the image processing unit 40 and the display device 50 when switching the display mode. Therefore, it is possible to switch the display mode without making the user feel unnatural, such as an image being interrupted. By using the control circuit 300 as shown in FIG. 7, it is possible to realize a display device 50 that suppresses power consumption and does not make the user feel uncomfortable when switching the display mode.

[0040] In the present embodiment, an example has been given in which the 1-bit counter 302, which is a counter unit, is reset to "0" when the display mode is switched, but the same effect can be obtained by setting (resetting) the 1-bit counter 302 to "1" when the display mode is switched. Also, although an example has been given in which the scanning circuit 200 starts from the scanning sequence B1 when switching to the display mode B, it may start from the scanning sequence B2.

[0041] So far, the display mode B repeating an operation unit consisting of two scan sequences has been described as an example of a display mode repeating an operation unit consisting of a plurality of scan sequences, but the number of scan sequences constituting one operation unit is not limited to two. For example, the display system SYS (display device 50) may operate in the display mode B and the display mode C as display modes. The display mode B is the above-mentioned operation. That is, one frame of image is divided into two fields, an odd field and an even field, and the image is displayed one field at a predetermined field rate. On the other hand, the display mode C divides one frame of image into four fields, a first field, a second field, a third field, and a fourth field, and the image is displayed one field at a predetermined field rate. That is, the display mode C repeats an operation unit consisting of four scan sequences. In this way, the number of types of scan sequences repeated in the display mode C may be greater than the number of types of scan sequences repeated in the display mode B.

[0042] The operation of the image processing unit 40 in display mode C will be described. Figures 9(a) to 9(e) are diagrams showing an example of image data sent from the image memory 10 to the image processing unit 40 and image display data output from the image processing unit 40 in each image processing mode. In display mode C, the image processing unit 40 performs image processing C1 in the first field, image processing C2 in the second field, image processing C3 in the third field, and image processing C4 in the fourth field.

[0043] The image data input to the image processing unit 40 is image data of N rows as shown in FIG. 9(a). Here, for ease of explanation, N is a multiple of 4. In the image processing C1, the image processing unit 40 outputs, as image display data, data extracted every four rows starting from the first row, such as the first row, the fifth row, ..., and the N-3th row, as shown in FIG. 9(b). In the image processing C2, the image processing unit 40 outputs, as image display data, data extracted every four rows starting from the second row, such as the second row, the sixth row, ..., and the N-2th row, as shown in FIG. 9(c). In the image processing C3, the image processing unit 40 outputs, as image display data, data extracted every four rows starting from the third row, such as the third row, the seventh row, ..., and the N-1th row, as shown in FIG. 9(d). In image processing C4, the image processing unit 40 outputs as image display data the data extracted every four rows starting from the fourth row, that is, the 4th row, the 8th row, ..., the Nth row, as shown in Figure 9(e).

[0044] Next, a description will be given of the operation of the scanning circuit 200 in display mode C. In addition to the scanning sequence B1 and the scanning sequence B2 in display mode B, the scanning circuit 200 operates in four scanning sequences, namely, the scanning sequence C1, the scanning sequence C2, the scanning sequence C3, and the scanning sequence C4 in display mode C. These scanning sequences are controlled by the control circuit 300.

[0045] When the display mode is display mode B, the scanning circuit 200 repeats an operation unit consisting of a scanning sequence B1 for scanning an odd field and a scanning sequence B2 for scanning an even field, as described above. When the display mode is display mode C, the scanning circuit 200 repeats an operation unit consisting of a scanning sequence C1 for scanning a first field, a scanning sequence C2 for scanning a second field, a scanning sequence C3 for scanning a third field, and a scanning sequence C4 for scanning a fourth field.

[0046] Figures 10(a) to 10(d) are timing diagrams for one field of the scanning circuit 200 in display mode C. Figure 10(a) shows the timing in scan sequence C1, Figure 10(b) shows the timing in scan sequence C2, Figure 10(c) shows the timing in scan sequence C3, and Figure 10(d) shows the timing in scan sequence C4.

[0047] In the scanning sequence C1, the scanning circuit 200 starts scanning to write a luminance signal from time t11 when image display data is input to the display device 50, and scans the first, fifth, ..., and N-3 rows in this order. The other rows to which no luminance signal is written are maintained in light emission according to the luminance signal written in the previous frame or before the previous frame. In the scanning sequence C2, the scanning circuit 200 starts scanning from time t11 when image display data is input to the display device 50, and scans the second, sixth, ..., and N-2 rows in this order. As in the scanning sequence C1, the other rows to which no luminance signal is written are maintained in light emission according to the luminance signal written in the previous frame or before the previous frame. Similarly, the scanning circuit 200 scans the third, seventh, ..., and N-2 rows in the scanning sequence C3, and the fourth, eighth, ..., and N rows in the scanning sequence C4.

[0048] In this way, scan sequences C1 to C4 scan half the rows compared to scan sequences B1 and B2. Therefore, the display rate of display mode C can be higher than the display rate of display mode B. For example, display mode C can achieve a display rate that is twice as high as that of display mode B.

[0049] Next, an example of a control circuit 300 for realizing a display in a display mode C in which four scan sequences are repeated as one operation unit will be described. FIG. 11 is a block diagram showing an example of a configuration of a control circuit 300 for making the control circuit repeat four scan sequences as one operation unit. The control circuit 300 includes a display mode synchronization circuit 301, a 2-bit counter 303 functioning as a counting unit for counting a synchronization signal output from the synchronization control unit 30, and a signal transition detection circuit 304. A display mode control signal is input from the CPU 20 to the display mode synchronization circuit 301. The display mode synchronization circuit 301 outputs a display mode signal synchronized with the synchronization signal to the scanning circuit 200 based on the display mode control signal. The 2-bit counter 303 outputs the counting result of the synchronization signal as a field signal. The maximum count value of the 2-bit counter 303 is 3. When it overflows, it counts from 0 again. In addition, the 2-bit counter 303 is reset and controlled by a reset signal output from the signal transition detection circuit 304. The signal transition detection circuit 304 detects a logical change in the display mode and outputs a reset signal. The display mode signal and the field signal generated in the control circuit 300 control the scanning sequence of the scanning circuit 200.

[0050] Fig. 12 shows a timing diagram of the operation of the display device 50 when switching the display mode between display mode B and display mode C. Fig. 12 shows a case where the display rate in display mode B is 60 Hz and the display rate in display mode C is 120 Hz.

[0051] In the initial state, the display mode synchronization circuit 301 sets the display mode signal to Hi level. At time t30, when a signal for selecting a display rate of 60 Hz (display mode B) is sent from the CPU 20, the display mode control signal becomes Lo level. After the instruction from the CPU 20, the synchronization control unit 30 outputs a synchronization signal at 60 Hz intervals from time t31. At time t31, when the first synchronization signal is output after the instruction from the CPU 20, the image processing unit 40 performs image processing B1. In addition, the display mode synchronization circuit 301 outputs a display mode control signal as a display mode signal in synchronization with this synchronization signal. Therefore, the display mode signal transitions from Hi level to Lo level. The signal transition detection circuit 304 detects the transition of the display mode signal and outputs a pulse-shaped reset signal. This resets the 2-bit counter 303, and the field signal becomes 0. That is, the 1-bit counter 302, which is a counting unit, starts counting from a reset state in display mode B in which two scanning sequences are repeated as one operation unit. This causes the scanning circuit 200 to start scanning in display mode B from the scanning sequence B1.

[0052] Thereafter, when the synchronization control unit 30 outputs a synchronization signal, the image processing unit 40 alternately repeats image processing B1 and image processing B2. Also, the 2-bit counter counts the synchronization signal and outputs it as a field signal. At this time, during the period when the display mode signal is at Lo level, the scanning circuit 200 executes the scanning sequence B1 when the field signal is 0 or 2, and executes the scanning sequence B2 when the field signal is 1 or 3. Therefore, after time t31, the scanning circuit 200 repeats the scanning sequence B1 and the scanning sequence B2.

[0053] Next, at time t32, when a signal for selecting a display rate of 120 Hz (display mode C) is sent from the CPU 20, the display mode control signal becomes Hi level. After the instruction from the CPU 20, from time t33, the synchronization control unit 30 outputs a synchronization signal at 120 Hz intervals. The display mode synchronization circuit 301 outputs a display mode control signal to the display mode signal in synchronization with the synchronization signal. Therefore, the display mode signal transitions from Lo level to Hi level. The signal transition detection circuit 304 detects the transition of the display mode signal and outputs a reset signal. As a result, the 2-bit counter 303 is reset and the field signal becomes 0. That is, the 1-bit counter 302, which is a counting unit, starts counting from a reset state in the display mode C in which four scan sequences are repeated as one operation unit. It can also be said that the 2-bit counter 303 is reset when transitioning from a display mode other than the display mode C among the multiple display modes to the display mode C. As a result, the scanning circuit 200 starts scanning in the display mode C from the scan sequence C1.

[0054] Thereafter, when the synchronization control unit 30 outputs a synchronization signal, the image processing unit 40 repeats the image processing C1 to C4 in order. Also, the 2-bit counter counts the synchronization signal and outputs it as a field signal. During the period when this display mode signal is at Hi level, the scanning circuit 200 executes the scanning sequence C1 when the field signal is 0, the scanning sequence C2 when the field signal is 1, the scanning sequence C3 when the field signal is 2, and the scanning sequence C4 when the field signal is 3. Therefore, after time t33, the scanning circuit 200 repeats the scanning sequence C1 to C4 in order.

[0055] At time t35, when the CPU 20 again transmits a signal to select a display rate of 60 Hz (display mode B), the display mode control signal becomes Lo level. After the instruction from the CPU 20, from time t36, the synchronization control unit 30 outputs a synchronization signal at 60 Hz intervals. The display mode synchronization circuit 301 outputs a display mode control signal to the display mode signal in synchronization with the synchronization signal. Therefore, the display mode signal transitions from Hi level to Lo level. At this time, the 2-bit counter 303 is reset by the signal transition detection circuit 304, and the field signal becomes 0. Therefore, from time t36 onwards, the operation is the same as from time t31 onwards.

[0056] Furthermore, at time t37, when the CPU 20 again transmits a signal to select a display rate of 120 Hz (display mode C), the display mode control signal becomes Lo level. After the instruction from the CPU 20, from time t36, the synchronization control unit 30 outputs a synchronization signal at 120 Hz intervals. The display mode synchronization circuit 301 outputs a display mode control signal to the display mode signal in synchronization with the synchronization signal. Therefore, the display mode signal transitions from Lo level to Hi level. The 2-bit counter 303 is reset by the signal transition detection circuit 304, and the field signal becomes 0. Therefore, from time t38 onwards, the operation is the same as from time t33 onwards.

[0057] In this way, when switching between two different display modes that scan multiple fields, the display device 50 can start an operation unit consisting of multiple scan sequences from the same specific scan sequence in either display mode. As a result, when switching the display mode, it is not necessary to initialize the image processing unit 40 and the display device 50. Therefore, natural switching of the display mode can be realized.

[0058] In the above embodiment, an example was given in which the 2-bit counter 303, which is a counter unit, is reset to "0" when switching the display mode, but the same effect can be obtained by setting (resetting) it to a value other than "0". Also, in this embodiment, a case has been described in which a common counter is provided for each of the display modes B and C, but a counter may be provided independently for each display mode. In this case, two or more counters are required according to the number of display modes that repeat an operation unit composed of a plurality of scanning sequences, but it is sufficient that the counter is configured to be able to count the fields to be scanned in each display mode.

[0059] The display modes described in the above embodiment are examples. As long as there is a display mode that repeats at least one operation unit composed of a plurality of scan sequences, a similar effect can be obtained when switching the display mode. Therefore, the number of display modes, the number of fields in each display mode, and the method of generating field data are not limited. For example, the display device 50 may operate to display by appropriately switching between the above-mentioned three display modes, display mode A, display mode B, and display mode C, depending on the image quality of the image to be displayed. In addition, the display device 50 may operate to display while switching between four or more types of display modes.

[0060] Here, application examples in which the display device 50 (display system SYS) of this embodiment is applied to a photoelectric conversion device, an electronic device, a lighting device, a mobile object, and a wearable device will be described with reference to Figs. 13 to 19. In addition, the display device 50 (display system SYS) has applications such as an exposure light source for an electrophotographic image forming device, a backlight for a liquid crystal display device, and a light-emitting device having a white light source and a color filter. The display device 50 (display system SYS) may be an image information processing device having an image input unit that inputs image information from an area CCD, a linear CCD, a memory card, or the like, an information processing unit that processes the input information, and displays the input image on the display unit. In addition, the display unit of a camera or an inkjet printer may have a touch panel function. The driving method of this touch panel function may be an infrared type, a capacitive type, a resistive film type, or an electromagnetic induction type, and is not particularly limited. In addition, the display device may be used in the display unit of a multifunction printer.

[0061] FIG. 13 is a schematic diagram showing an application example of the display device 50 (display system SYS) of this embodiment. The display device 1000 shown in FIG. 13 may have a touch panel 1003, a display panel 1005, a frame 1006, a circuit board 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. When an image is displayed on the display panel 1005 in the display device 1000, the image may be displayed while switching the display mode as described above according to the image quality of the image to be displayed. Flexible printed circuits FPC1002 and 1004 are connected to the touch panel 1003 and the display panel 1005. An active element such as a transistor is disposed on the circuit board 1007. The battery 1008 may not be provided if the display device 1000 is not a portable device, and even if the display device 1000 is a portable device, it does not need to be provided at this position.

[0062] The display device 1000 shown in Fig. 13 may be used as a display unit of a photoelectric conversion device (imaging device) having an optical unit with a plurality of lenses and an imaging element that receives light that has passed through the optical unit and photoelectrically converts it into an electrical signal. The photoelectric conversion device may have a display unit that displays information acquired by the imaging element. The display unit may be a display unit exposed to the outside of the photoelectric conversion device, or may be a display unit disposed within a viewfinder. The photoelectric conversion device may be a digital camera or a digital video camera.

[0063] FIG. 14 is a schematic diagram showing an example of a photoelectric conversion device using the display device 50 (display system SYS) of this embodiment. The photoelectric conversion device 1100 may have a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The photoelectric conversion device 1100 may also be called an imaging device. The above-mentioned display device 50 (display system SYS) can be applied to the viewfinder 1101, which is a display unit. In addition, the above-mentioned display device 50 (display system SYS) may be applied to the rear display 1102. In these cases, the display device 50 (display system SYS) may display not only an image to be captured, but also environmental information, imaging instructions, and the like. The environmental information may include the intensity of external light, the direction of external light, the moving speed of the subject, and the possibility that the subject will be blocked by an obstruction.

[0064] Since the timing suitable for capturing an image is often short, it is better to display information as soon as possible. Therefore, a display device 50 (display system SYS) including an organic light-emitting material such as an organic EL element as a light-emitting element may be used in the viewfinder 1101. This is because organic light-emitting materials have a fast response speed. A display device 50 (display system SYS) using an organic light-emitting material is more suitable for use in such devices that require a high display speed than a liquid crystal display device.

[0065] The photoelectric conversion device 1100 has an optical section (not shown). The optical section has a plurality of lenses, and forms an image on a photoelectric conversion element (not shown) housed in a housing 1104 that receives light that has passed through the optical section. The focal points of the plurality of lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically.

[0066] The display device 50 (display system SYS) may be applied to a display unit of an electronic device. In that case, it may have both a display function and an operation function. Examples of the portable terminal include a mobile phone such as a smartphone, a tablet, and a head-mounted display.

[0067] FIG. 15 is a schematic diagram showing an example of an electronic device using the display device 50 (display system SYS) of this embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may have a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type reaction unit. The operation unit 1202 may be a biometric recognition unit that recognizes a fingerprint and performs unlocking, etc. A portable device having a communication unit can also be called a communication device. The above-mentioned display device 50 (display system SYS) can be applied to the display unit 1201.

[0068] 16(a) and 16(b) are schematic diagrams showing further application examples using the display device 50 (display system SYS) of this embodiment. FIG. 16(a) shows a display device such as a television monitor or a PC monitor. The display device 1300 has a frame 1301 and a display unit 1302. When the display device 1300 displays an image on the display unit 1302, the image may be displayed while switching the display mode as described above according to the image quality of the image to be displayed. The display device 1300 may have a base 1303 that supports the frame 1301 and the display unit 1302. The base 1303 is not limited to the form shown in FIG. 16(a). For example, the lower side of the frame 1301 may also serve as the base 1303. The frame 1301 and the display unit 1302 may be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less. When an image is displayed on the display unit 1302 of the display device 1300, the image may be displayed while switching the display mode as described above depending on the image quality of the image to be displayed.

[0069] FIG. 16(b) is a schematic diagram showing another application example using the display device 50 (display system SYS) of this embodiment. The display device 1310 of FIG. 16(b) is configured to be bendable, and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. When the display device 1310 displays an image on the first display unit 1311 and the second display unit 1312, the display mode may be switched as described above according to the image quality of the image to be displayed. The first display unit 1311 and the second display unit 1312 may be a single display unit with no joints. The first display unit 1311 and the second display unit 1312 can be divided at the bending point. The first display unit 1311 and the second display unit 1312 may display different images, or the first display unit and the second display unit may display one image.

[0070] FIG. 17 is a schematic diagram showing an example of an illumination device using the display device 50 (display system SYS) of this embodiment. The illumination device 1400 may have a housing 1401, a light source 1402, a circuit board 1403, an optical film 1404, and a light diffusion unit 1405. The above-mentioned display device 50 (display system SYS) can be applied to the light source 1402. The optical film 1404 may be a filter that improves the color rendering of the light source. The light diffusion unit 1405 can effectively diffuse the light of the light source, such as lighting up, and deliver the light to a wide range. If necessary, a cover may be provided on the outermost part. The illumination device 1400 may have both the optical film 1404 and the light diffusion unit 1405, or only one of them.

[0071] The lighting device 1400 is, for example, a device that illuminates a room. The lighting device 1400 may emit white light, neutral white light, or any other color from blue to red. It may have a dimming circuit that adjusts the light intensity. The lighting device 1400 may have a power supply circuit connected to the display device 50 (display system SYS) that functions as the light source 1402. The power supply circuit is a circuit that converts AC voltage into DC voltage. Moreover, white has a color temperature of 4200K, and neutral white has a color temperature of 5000K. Moreover, the lighting device 1400 may have a color filter. Moreover, the lighting device 1400 may have a heat dissipation unit. The heat dissipation unit dissipates heat inside the device to the outside of the device, and examples of the heat dissipation unit include metals with high specific heat and liquid silicon.

[0072] FIG. 18 is a schematic diagram of an automobile having a tail lamp, which is an example of a vehicle lamp using the display device 50 (display system SYS) of this embodiment. The automobile 1500 may have a tail lamp 1501, and may be configured to turn on the tail lamp 1501 when braking or the like is performed. The display device 50 (display system SYS) of this embodiment may be used as a head lamp as a vehicle lamp. An automobile is an example of a moving body, and the moving body may be a ship, a drone, an aircraft, a railroad vehicle, an industrial robot such as an automated guided vehicle (AGV), or the like. The moving body may have a body and a lamp provided on the body. The lamp may indicate the current position of the body.

[0073] The above-mentioned display device 50 (display system SYS) can be applied to the tail lamp 1501. The tail lamp 1501 may have a protective member that protects the display device 50 (display system SYS) functioning as the tail lamp 1501. The protective member may be made of any material as long as it has a certain degree of strength and is transparent, and may be made of polycarbonate or the like. The protective member may be made by mixing a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like with polycarbonate.

[0074] The automobile 1500 may have a body 1503 and a window 1502 attached thereto. The window may be a window for checking the front and rear of the automobile, or may be a transparent display. The display device 50 (display system SYS) may be used in the transparent display. In this case, the constituent materials of the electrodes and the like of the display device 50 (display system SYS) are made of transparent members. The display device 50 (display system SYS) may also be used in the instrument panel of the automobile 1500, the image display unit of a car navigation system, or the like.

[0075] Application examples of the display device 50 (display system SYS) of each of the above-mentioned embodiments will be further described with reference to Fig. 19(a) and Fig. 19(b). The display device 50 (display system SYS) can be applied to a system that can be worn as a wearable device, such as smart glasses, HMD, or smart contact lenses. The display device 50 (display system SYS) used in such application examples can include an imaging device capable of photoelectrically converting visible light, and a display device 50 (display system SYS) capable of emitting visible light.

[0076] 19(a) illustrates glasses 1600 (smart glasses) according to one application example. An imaging device 1602 such as a CMOS sensor or a SPAD is provided on the front side of a lens 1601 of the glasses 1600. In addition, a display device 50 (display system SYS) according to each of the above-mentioned embodiments is provided on the back side of the lens 1601.

[0077] The glasses 1600 further include a control device 1603. The control device 1603 functions as a power source that supplies power to the image capture device 1602 and the display device 50 (display system SYS) according to each embodiment. The control device 1603 also controls the operations of the image capture device 1602 and the display device. The lens 1601 is formed with an optical system for focusing light on the image capture device 1602.

[0078] FIG. 19(b) illustrates glasses 1610 (smart glasses) according to one application example. The glasses 1610 have a control device 1612, which is equipped with an imaging device corresponding to the imaging device 1602 and a display device 50 (display system SYS). An optical system for projecting light emitted from the imaging device in the control device 1612 and the display device 50 (display system SYS) is formed in the lens 1611, and an image is projected onto the lens 1611. The control device 1612 functions as a power source that supplies power to the imaging device and the display device, and controls the operation of the imaging device and the display device 50 (display system SYS). The control device may have a line-of-sight detection unit that detects the line of sight of the wearer. Infrared light may be used to detect the line of sight. The infrared light emission unit emits infrared light toward the eyeball of a user gazing at a display image. An imaging unit having a light receiving element detects the reflected light of the emitted infrared light from the eyeball, thereby obtaining an image of the eyeball. By providing a reduction unit that reduces the amount of light from the infrared light emitting unit to the display unit in a plan view, degradation of image quality is reduced.

[0079] The gaze of the user with respect to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any known method can be applied to gaze detection using the image of the eyeball. As an example, a gaze detection method based on a Purkinje image formed by reflection of irradiated light on the cornea can be used.

[0080] More specifically, a gaze detection process based on the pupil-corneal reflex method is performed. Using the pupil-corneal reflex method, a gaze vector that indicates the direction (rotation angle) of the eyeball is calculated based on the pupil image and the Purkinje image included in the captured image of the eyeball, thereby detecting the user's gaze.

[0081] A display device 50 (display system SYS) according to one embodiment of the present invention may have an imaging device having a light receiving element, and may control the display image of the display device 50 (display system SYS) based on user's line of sight information from the imaging device.

[0082] Specifically, the display device 50 (display system SYS) determines a first field of view area to which the user gazes and a second field of view area other than the first field of view area based on line-of-sight information. The first field of view area and the second field of view area may be determined by a control device (e.g., the control circuit 300) of the display device 50 (display system SYS), or may receive a determination from an external control device. In the display area of ​​the display device 50 (display system SYS), the display resolution of the first field of view area may be controlled to be higher than the display resolution of the second field of view area. In other words, the resolution of the second field of view area may be lower than the first field of view area.

[0083] The display area includes a first display area and a second display area different from the first display area, and an area having a high priority is determined from the first display area and the second display area based on line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the display device 50 (display system SYS), or may be determined by an external control device and received. The resolution of the area having a high priority may be controlled to be higher than the resolution of areas other than the area having a high priority. In other words, the resolution of an area having a relatively low priority may be lowered.

[0084] AI may be used to determine the first field of view area and areas with high priority. The AI ​​may be a model configured to estimate the angle of the line of sight and the distance to an object at the end of the line of sight from an image of the eyeball, using an image of the eyeball and the direction in which the eyeball in the image was actually looking as teacher data. The AI ​​program may be included in the display device, the imaging device, or an external device. If included in an external device, it is transmitted to the display device 50 (display system SYS) via communication.

[0085] When display control is performed based on visual recognition detection, the present invention is preferably applicable to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured outside information in real time.

[0086] The invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention. [Explanation of symbols]

[0087] 50: display device, 100: pixel array, 101: pixel, 200: scanning circuit, 300: control circuit

Claims

1. A display device including: a scanning circuit that scans a pixel array in which a plurality of pixels are arranged in a matrix; and a control circuit that controls the scanning circuit to scan the pixel array in accordance with a display mode selected from a plurality of display modes, the plurality of display modes include a first display mode in which the scanning circuit repeats an operation unit constituted by a plurality of scanning sequences including a first scanning sequence in which the scanning circuit scans a predetermined scanning line of the pixel array in a predetermined order; When transitioning from a display mode other than the first display mode among the plurality of display modes to the first display mode, the control circuit controls the scanning circuit to start the operation unit from the first scanning sequence; A counting unit that counts the synchronization signal is further included. In the first display mode, the control circuit controls a scan sequence in which the scanning circuit scans the pixel array, among the plurality of scan sequences, based on a result of the counting of the synchronization signal by the count unit; The display device according to claim 1, wherein the counting unit starts counting from a reset state when a transition is made from a display mode other than the first display mode among the plurality of display modes to the first display mode.

2. 2 . The display device according to claim 1 , wherein the counter is reset when a display mode among the plurality of display modes is shifted from a display mode other than the first display mode to the first display mode.

3. 3. The display device according to claim 1, wherein the plurality of display modes further includes a second display mode in which the scanning circuit scans the pixel array in one scanning sequence.

4. the plurality of display modes further includes a second display mode in which the scanning circuit scans the pixel array in a scanning sequence; 3. The display device according to claim 1, wherein in the second display mode, the counting section is in a reset state.

5. 5. The display device according to claim 3, wherein a display rate in the first display mode is higher than a display rate in the second display mode.

6. the plurality of scan sequences being a first plurality of scan sequences and the unit of operation being a first unit of operation; the plurality of display modes further include a third display mode in which the scanning circuit repeats a second operation unit configured with a second plurality of scanning sequences including a second scanning sequence different from the first scanning sequence; The display device according to any one of claims 1 to 5, characterized in that when transitioning from a display mode other than the third display mode among the plurality of display modes to the third display mode, the control circuit controls the scanning circuit to start the second operation unit from the second scanning sequence.

7. the plurality of scan sequences being a first plurality of scan sequences and the unit of operation being a first unit of operation; the plurality of display modes further include a third display mode in which the scanning circuit repeats a second operation unit configured with a second plurality of scanning sequences including a second scanning sequence different from the first scanning sequence; When transitioning from a display mode other than the third display mode among the plurality of display modes to the third display mode, the control circuit controls the scanning circuit to start the second operation unit from the second scanning sequence; 5. The display device according to claim 1, wherein in the third display mode, the counting section starts counting from a reset state.

8. 8. The display device according to claim 7, wherein the counting unit is reset when the display mode transitions from a display mode other than the third display mode among the plurality of display modes to the third display mode.

9. 9. The display device according to claim 6, wherein a display rate of the third display mode is higher than a display rate of the first display mode.

10. 10. The display device according to claim 6, wherein the number of types of scanning sequences repeated in the third display mode is greater than the number of types of scanning sequences repeated in the first display mode.

11. 11. The display device according to claim 1, wherein in the first scanning sequence, the scanning circuit scans a part of the pixel array.

12. 12. The display device according to claim 1, wherein in the first scanning sequence, the scanning circuitry simultaneously scans a plurality of rows of the pixel array.

13. 13. The display device of claim 1, further comprising an image processor for generating image display data for displaying an image in the pixel array.

14. The display device according to claim 13 , wherein the image processing unit generates different image display data in accordance with each of the plurality of display modes.

15. 15. The display device according to claim 13, wherein, when transitioning to the first display mode, the image processing unit generates image data according to the first scanning sequence.

16. The imaging device includes an optical unit having a plurality of lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image, A photoelectric conversion device, comprising: the display unit that displays an image captured by the imaging element; and the display unit according to claim 1 .

17. A display device having a housing and a communication unit provided in the housing for communicating with an external device, 16. An electronic device, comprising: a display device according to claim 1, wherein the display unit is a display device having a display function.

18. A lighting device having a light source and at least one of a light diffusion unit and an optical film, 16. An illumination device, characterized in that the light source comprises a display device according to claim 1.

19. A moving body having a body and a lighting device provided on the body, A moving object, comprising: a lighting device comprising the display device according to claim 1 .

20. A wearable device having a display unit for displaying an image, A wearable device, wherein the display unit comprises the display device according to claim 1 .

Images