Field sequential liquid crystal display device

Abstract

To provide a field sequential system liquid crystal display device capable of suppressing the occurrence of color breakup.SOLUTION: A field sequential liquid crystal display device according to an embodiment includes a display panel, a light source, and a light source control circuit. The display panel has a display area in which a plurality of pixels are arranged in a matrix. The light source emits light toward the display panel and includes a light emitter of a first color, a light emitter of a second color, and a light emitter of a third color. The light source control circuit controls the operation of each light emitter. The display area includes a first display area determined based on the line of sight of the user, and a second display area excluding the first display area. The light source control circuit controls the operation of the respective light emitting bodies so that the lighting cycle of the light emitting body for irradiating light toward the first display area becomes earlier and shorter than the lighting cycle of the light emitting body for irradiating light toward the second display area concerning the lighting cycle for successively lighting the respective light emitting bodies.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a field sequential liquid crystal display device. [Background technology]

[0002] Field sequential driving (backlight lighting scanning method) is a well-known driving method for liquid crystal display devices. In liquid crystal display devices that use field sequential driving, color display is achieved by changing the color of the illumination for each of the multiple sub-frame periods included in one frame period.

[0003] However, in a liquid crystal display device that employs field sequential driving, color breakup may occur when the line of sight is moved. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-029720 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-181140 Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a field sequential liquid crystal display device that can suppress the occurrence of color breakup. [Means for solving the problem]

[0006] A field sequential liquid crystal display device according to one embodiment includes a display panel, a light source, and a light source control circuit. The display panel has a display area in which a plurality of pixels are arranged in a matrix. The light source emits light toward the display panel and includes a first color light emitter, a second color light emitter, and a third color light emitter. The light source control circuit controls the operation of each of the light emitters. The display area includes a first display area determined based on a user's line of sight and a second display area excluding the first display area. The light source control circuit controls the operation of each of the light emitters so that the lighting period of the light emitter that emits light toward the first display area is shorter than the lighting period of the light emitter that emits light toward the second display area. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing an example of the appearance of a head-mounted display including a field-sequential liquid crystal display device according to the first embodiment. [Figure 2] FIG. 2 is a plan view showing an example of the main configuration of a head-mounted display including a field-sequential liquid crystal display device according to the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 4 is a diagram showing an example of the configuration of a field sequential liquid crystal display device according to the first embodiment. [Figure 5] FIG. 5 is a schematic diagram showing an example of the configuration of a display panel included in the field sequential liquid crystal display device according to the first embodiment. [Figure 6] FIG. 6 is a diagram showing a first configuration example of a light source included in the field sequential liquid crystal display device according to the first embodiment. [Figure 7] FIG. 7 is a diagram showing a first configuration example of a light source included in the field sequential liquid crystal display device according to the first embodiment. [Figure 8]FIG. 8 is a diagram showing a second configuration example of the light source included in the field sequential liquid crystal display device according to the first embodiment. [Figure 9] FIG. 9 is a diagram showing a second configuration example of the light source included in the field sequential liquid crystal display device according to the first embodiment. [Figure 10] FIG. 10 is a timing chart showing an example of a display operation in one frame period of a field sequential liquid crystal display device according to a comparative example. [Figure 11] FIG. 11 is a timing chart showing an example of a display operation in one frame period of the field sequential liquid crystal display device according to the first embodiment. [Figure 12] FIG. 12 is a timing chart showing an example of display processing in one frame period of the field sequential liquid crystal display device according to the second embodiment. [Figure 13] FIG. 13 is a timing chart showing an example of a display operation in one frame period of the field sequential liquid crystal display device according to the third embodiment. [Figure 14] FIG. 14 is a schematic diagram showing an example of the relative relationship between the display panel and the user's eyes. [Figure 15] FIG. 15 is a schematic diagram showing an example of the relative relationship between the display panel and the user's eyes. [Figure 16] FIG. 16 is a timing chart showing an example of a display operation in one frame period of the field sequential liquid crystal display device according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, each embodiment will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and the invention is not limited to the contents described in the following embodiments. Modifications that a person skilled in the art can easily make are naturally included in the scope of the disclosure. For clearer explanation, the size, shape, etc. of each part may be changed from the actual embodiment and shown schematically in the drawings. Corresponding elements in multiple drawings may be given the same reference numerals, and detailed descriptions may be omitted.

[0009] (First embodiment) First, the first embodiment will be described. FIG. 1 is a perspective view showing an example of the appearance of a head-mounted display 1 including a field-sequential liquid crystal display device DSP according to this embodiment. The head-mounted display 1 is used to provide, for example, virtual reality (VR), augmented reality (AR), and mixed reality (MR) to a user wearing the head-mounted display 1. The head-mounted display 1 includes, for example, a liquid crystal display device DSPR for the right eye and a liquid crystal display device DSPL for the left eye. When a user wears the head-mounted display 1 on their head, the liquid crystal display device DSPR is positioned in front of the user's right eye, and the liquid crystal display device DSPL is positioned in front of the user's left eye. The liquid crystal display device DSPR has a configuration substantially similar to that of the liquid crystal display device DSPL. In the following description, the liquid crystal display devices DSPR and DSPL may be collectively referred to as the liquid crystal display device DSP.

[0010] The head mounted display 1 is connected to an information processing device, for example, via a cable or wireless communication. The head mounted display 1 receives an image signal from the information processing device for displaying an image on the liquid crystal display device DSP. The head mounted display 1 may operate by receiving power from the information processing device, for example, or may have its own power source.

[0011] FIG. 2 is a plan view showing an example of the main configuration of the head-mounted display 1. In the following drawings, an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other are shown as necessary to facilitate understanding. The direction along the X-axis is referred to as the first direction X, the direction along the Y-axis is referred to as the second direction Y, and the direction along the Z-axis is referred to as the third direction Z. The first direction X and the second direction Y are directions parallel to the substrates that constitute the liquid crystal display devices DSPR and DSPL, and the third direction Z corresponds to the thickness direction of the liquid crystal display devices DSPR and DSPL. The plane defined by the X-axis and the Y-axis is referred to as the XY plane.

[0012] The head mounted display 1 includes, for example, a housing 51, an interface 53, a multi-axis sensor 54, a gaze detection sensor 55, a liquid crystal display device DSP (liquid crystal display device DSPR, liquid crystal display device DSPL), and a signal processing circuit 20. The liquid crystal display device DSP is placed in front of the left and right eyes of the user and therefore includes an optical system (not shown) for forming an image on the user's eyes.

[0013] The housing 51 holds the other components of the head mounted display 1. For example, the housing 51 holds the liquid crystal display device DSPR and the liquid crystal display device DSPL side by side at a predetermined interval. In the example shown in Fig. 2, a partition 51a is provided between the liquid crystal display device DSPR and the liquid crystal display device DSPL, but the partition 51a may be omitted.

[0014] The liquid crystal display devices DSPR and DSPL are liquid crystal display devices that are provided so as to be able to operate independently. Each liquid crystal display device DSP has a display panel, a light source, and the like that operate under the control of the signal processing circuit 20.

[0015] The interface 53 is a connection section to which various cables can be connected. Specifically, the interface 53 is, for example, an interface that integrates an HDMI (registered trademark) (High Definition Multimedia Interface) interface and a USB (Universal Serial Bus). For example, a cable for communicating with the above-mentioned information processing device is connected to the interface 53. The interface 53 is connected to each liquid crystal display device DSP, the multi-axis sensor 54, and the signal processing circuit 20 via a substrate 57 described later.

[0016] The multi-axis sensor 54 is a sensor for detecting the movement of the head mounted display 1. The multi-axis sensor 54 can detect the movement of the user when the head mounted display 1 is worn on the head of the user.

[0017] The gaze detection sensor 55 is a sensor that tracks the gaze using eye tracking technology and detects a concentrated area where the user's gaze is concentrated. The gaze detection sensor 55 detects at least the gaze position in the second direction Y as the concentrated area. The gaze detection sensor 55 may use any method for detecting the gaze position. The present embodiment is not limited to the specific configuration of the gaze detection sensor 55 and the gaze detection method.

[0018] The signal processing circuit 20 controls the operation of displaying an image corresponding to an image signal from the information processing device on each liquid crystal display device DSP, as will be described in detail later.

[0019] 3 is a cross-sectional view taken along line AA of FIG. 2 in an XZ plane defined by a first direction X and a third direction Z. FIG.

[0020] Each liquid crystal display device DSP includes the display panel 40, the light source 60, and the like, as described above.

[0021] The display panel 40 displays an image using a signal from the signal processing circuit 20 and light from the light source 60. The display panel 40 has two substrates (a first substrate and a second substrate) and liquid crystal or the like sealed between the two substrates. The liquid crystal contains liquid crystal molecules whose orientation changes depending on the potential of pixel electrodes 11, which will be described later. The display panel 40 controls the transmittance of light incident on the liquid crystal by changing the orientation of the liquid crystal molecules contained in the liquid crystal. The liquid crystal may be, for example, a liquid crystal with positive dielectric anisotropy (positive liquid crystal), a liquid crystal with negative dielectric anisotropy (negative liquid crystal), or a polymer dispersed liquid crystal.

[0022] The light source 60 emits light from the rear surface toward the display panel 40. The light source 60 includes a light emitter of a first color (for example, red), a light emitter of a second color (for example, green), and a light emitter of a third color (for example, blue).

[0023] The above-described signal processing circuit 20 and multi-axis sensor 54 are provided on a substrate 57 of the head mounted display 1. Each liquid crystal display device DSP is connected to the signal processing circuit 20 and multi-axis sensor 54 via the substrate 57.

[0024] 4 is a diagram showing an example of the configuration of a liquid crystal display device DSP according to this embodiment. The liquid crystal display device DSP includes a signal processing circuit 20, a display panel 40, a signal output circuit 31, a scanning circuit 32, a light source 60, a light source control circuit 61, etc.

[0025] The signal processing circuit 20 sequentially receives frame image signals corresponding to the frame rate from the information processing device. The frame rate indicates the number of frame images displayed in a predetermined time period (e.g., one second). The signal processing circuit 20 also sequentially receives signals indicating the detection result of the user's gaze position from the gaze detection sensor 55.

[0026] The signal processing circuit 20 outputs various signals for controlling operation timing to the signal output circuit 31, the scanning circuit 32, and the light source control circuit 61 in accordance with the input frame image signal.

[0027] The display panel 40 displays an image in response to a signal from the signal processing circuit 20. The display panel 40 has a display area 41 in which a plurality of pixels P are arranged in a matrix in a first direction X (row direction) and a second direction Y (column direction). Hereinafter, a plurality of pixels P aligned in the first direction X will be referred to as a "pixel row." The example of FIG. 4 shows a case in which pixel rows P1 to PN, each including a plurality of pixels P aligned in the first direction X, are aligned in the second direction Y. Note that N is an integer greater than or equal to 2.

[0028] The display area 41 of this embodiment includes three display areas 41a, 41b, and 41c divided in the second direction Y. The display area 41a is an area that includes the uppermost pixel row P1 of the display area 41 in the second direction Y. The display area 41b is an area that includes the central pixel row Pm of the pixel rows P1 to PN of the display area 41 in the second direction Y. The display area 41c is an area that includes the lowermost pixel row PN of the display area 41 in the second direction Y. In the example of FIG. 4, the lengths of the display areas 41a, 41b, and 41c in the second direction Y are approximately the same, but they may each have a different length.

[0029] The signal output circuit 31, the scanning circuit 32, and the light source control circuit 61 will be described in detail below together with the description of FIG.

[0030] 5 is a schematic diagram showing an example configuration of a display panel 40. As described above, the display panel 40 has a plurality of pixels P arranged in a matrix. Each pixel P includes a switching element 12 and a pixel electrode 11. The switching element 12 is connected to a scanning line GL and a signal line DTL. The switching element 12 is, for example, a thin film transistor (TFT). The pixel electrode 11 is electrically connected to the signal line DTL via the switching element 12.

[0031] 5, the signal lines DTL are arranged along one of the arrangement directions of the pixels P (first direction X). The signal lines DTL extend along the other of the arrangement directions of the pixels P (second direction Y). The signal lines DTL are shared by the switching elements 12 included in each of the multiple pixels P arranged in the second direction Y.

[0032] The plurality of scanning lines GL are aligned along the second direction Y. The scanning lines GL extend along the first direction X. The scanning lines GL are shared by the switching elements 12 included in each of the plurality of pixels P aligned in the first direction X. In the example shown in FIG. 5, the switching elements 12 included in each of the plurality of pixels P included in pixel row P1 are connected to the scanning line G1. Similarly, the switching elements 12 included in each of the plurality of pixels P included in pixel row PN are connected to the scanning line GN. The same applies to the switching elements 12 included in each of the plurality of pixels P included in the other pixel rows and the scanning line GL. The number of scanning lines GL in the display area 41 of the display panel 40 is the same as the number of pixel rows in the display area 41.

[0033] The scanning circuit 32 is electrically connected to the display panel 40 via scanning lines GL. The scanning circuit 32 outputs a drive signal to each of the plurality of scanning lines GL to turn on (conductive state) the switching element 12 connected to the corresponding scanning line GL. Specifically, the scanning circuit 32 scans the plurality of pixel rows P1 to PN by shifting the scanning line GL to which the drive signal is output, for example, in the order of scanning line G1 to scanning line GN.

[0034] The signal output circuit 31 is electrically connected to the display panel 40 via a signal line DTL. The signal output circuit 31 outputs an image signal to the signal line DTL. The image signal output to the signal line DTL is supplied to a pixel electrode 11 connected to the switching element 12 during a period in which the switching element 12 is turned on based on a drive signal output to a scanning line GL. When the image signal is supplied to the pixel electrode 11, a voltage corresponding to the image signal is applied to the pixel electrode 11, and the light transmittance of a pixel P including the pixel electrode 11 (more specifically, a liquid crystal portion overlapping with the pixel P) changes. In the following description, supplying an image signal to the pixel electrode 11 of a pixel P and applying a voltage to the pixel electrode 11 may be referred to as writing an image signal to the pixel P.

[0035] The light source 60 is disposed on the rear surface of the display panel 40. The light source 60 illuminates the display panel 40 by emitting light toward the display panel 40. The light source 60 has a plurality of light-emitting modules 62. Each of the plurality of light-emitting modules 62 includes a light-emitting element 63R that emits light of a first color, a light-emitting element 63G that emits light of a second color, and a light-emitting element 63B that emits light of a third color. The plurality of light-emitting modules 62 emit light of the first color, the second color, and the third color, respectively, under the control of a light source control circuit 61.

[0036] The light source control circuit 61 controls the operations of the light emitters 63R, 63G, and 63B based on a light source control signal from the signal processing circuit 20. The light source control signal is, for example, a signal including information on the light intensity (brightness) of the light emitting module 62, which is set according to the input gradation value to the pixel P. For example, when a dark image is displayed, the light intensity of the light emitting module 62 is set to be small. When a bright image is displayed, the light intensity of the light emitting module 62 is set to be large.

[0037] In this embodiment, the light source control circuit 61 sequentially drives each of the light emitters 63R, 63G, and 63B using a field sequential method. In the field sequential method, image signals corresponding to the first, second, and third colors are sequentially written in a time-division manner during one frame period, and the light emitters of the colors corresponding to the written image signals are sequentially lit. Because the human eye has limited temporal resolution, afterimages occur when a multi-color image is displayed in a time-division manner. The field sequential method utilizes this afterimage to allow humans to recognize an image composed of three colors.

[0038] Here, in this embodiment, the light source control circuit 61 controls the operation of each light emitter 63R, 63G, 63B so that the lighting period of each light emitter that irradiates light toward a first display area among the display areas 41a, 41b, 41c, which is determined based on the user's line of sight, is shorter than the lighting period of the light emitter that irradiates light toward a second display area other than the first display area.

[0039] Next, a configuration example of the light source 60 will be described. The specific configuration of the light source 60 may be any configuration that can irradiate the first color, second color, and third color light to each of the display areas 41a, 41b, and 41c. Below, a first configuration example and a second configuration example of the light source 60 will be described, but the configuration of the light source 60 in this embodiment is not limited to the first and second configuration examples.

[0040] 6 and 7 are diagrams showing a first configuration example of the light source 60. FIG. 6 shows a simplified diagram of the light source 60 in the XY plane. The light source 60 has a plurality of light-emitting modules 62 arranged in a matrix. The plurality of light-emitting modules 62 are arranged, for example, at equal intervals from one another. The light-emitting modules 62 used in the first configuration example are, for example, RGB independently lit LEDs.

[0041] Light source 60 is divided into light-emitting region A1 that overlaps display region 41a, light-emitting region A2 that overlaps display region 41b, and light-emitting region A3 that overlaps display region 41c. The multiple light-emitting modules 62 included in light-emitting region A1 can light up light-emitting elements of the same color at the same timing. Similarly, light-emitting regions A2 and A3 can light up light-emitting elements of the same color at the same timing.

[0042] 7 shows a simplified diagram of the XZ plane of the light source 60. The light source 60 has a plurality of light-emitting modules 62 as well as an optical sheet 64. The optical sheet 64 is provided, for example, between the light-emitting modules 62 and the display panel 40 so that the display panel 40 can be uniformly illuminated with light from the plurality of light-emitting modules 62.

[0043] 8 and 9 are diagrams showing a second configuration example of the light source 60. In FIG. FIG. 8 shows a simplified diagram of the light source 60 in the XY plane. The light source 60 has a light-emitting region A1 that overlaps with the display region 41a, a light-emitting region A2 that overlaps with the display region 41b, and a light-emitting region A3 that overlaps with the display region 41c. Each of the light-emitting regions A1 to A3 has a light-emitting module 62. The light-emitting module 62 used in the second configuration example is, for example, an RGB independent lighting LD (Laser Diode) package. The RGB independent lighting LD package can emit laser light of a first color, a second color, and a third color, respectively. The laser light emitted from the light-emitting module 62 may be diffused light that spreads from the irradiation direction as the center, or may be polarized laser light.

[0044] FIG. 9 shows a simplified diagram of the light source 60 in the XZ plane. The light source 60 includes a trapezoidal light guide plate LG, a reflector REF1, a prism layer Pr, and an optical sheet 64 for each of the light-emitting modules 62. Here, a configuration example in the light-emitting region A1 will be mainly described. The light guide plate LG has a first main surface F1 facing the display region 41a of the display panel 40, a second main surface F2 opposite the first main surface F1, a first side surface F3, and a second side surface F4 opposite the first side surface F3. The light-emitting module 62 faces the first side surface F3. The reflector REF1 faces the second side surface F4. Furthermore, a prism layer Pr including a large number of prisms (also referred to as convex portions or grooves) is provided on the second main surface F2. The distance between the first main surface F1 and the second main surface F2 (i.e., the thickness of the light guide plate LG) increases from the first side surface F3 toward the second side surface F4.

[0045] The laser light emitted from the light-emitting module 62 enters the light guide plate LG from the first side surface F3. The incident light LT travels toward the reflector REF1 while repeatedly being totally reflected between the first main surface F1 and the second main surface F2 of the light guide plate LG. The light LT that reaches the reflector REF1 is reflected by the reflector REF1. The light LT reflected by the reflector REF1 is totally reflected by the first main surface F1 and then travels toward the second main surface F2. When the light LT that has been totally reflected by the first main surface F1 enters the prism layer Pr provided on the second main surface F2, it no longer satisfies the total reflection condition and is emitted as emitted light LO from the first main surface F1 of the light guide plate LG. The display area 41a is illuminated by the emitted light LO.

[0046] Light-emitting regions A2 and A3 each have the same configuration as in FIG. 9. The first main surface F1 of the light guide plate LG in light-emitting region A2 faces the display region 41b. That is, the display region 41b is illuminated by the light LO emitted from the first main surface F1 of light-emitting region A2. Similarly, the first main surface F1 of the light guide plate LG in light-emitting region A3 faces the display region 41c. That is, the display region 41c is illuminated by the light LO emitted from the first main surface F1 of light-emitting region A3.

[0047] Next, a comparative example of this embodiment will be described. Fig. 10 is a timing chart showing an example of a display operation in one frame period F of a liquid crystal display device DSP according to the comparative example. Note that one frame period F is a period for providing (writing) an image signal corresponding to one frame image to each pixel P.

[0048] In the comparative example, one frame period F has sub-frame periods SR, SG, and SB. In each of the sub-frame periods SR, SG, and SB, an image signal corresponding to a different color gradation value is written. For example, when the image signal of the first frame is expressed in RGB gradation values, it is assumed that (R, G, B) = (r1, g1, b1). r1 is the gradation value of the first color (red) in the input signal containing information indicating the RGB gradation values. g1 is the gradation value of the second color (green) in the input signal containing information indicating the RGB gradation values. b1 is the gradation value of the third color (blue) in the input signal containing information indicating the RGB gradation values.

[0049] In this case, an image signal corresponding to a gradation value of "r1" is written to each pixel P during the sub-frame period SR. Also, an image signal corresponding to a gradation value of "g1" is written to each pixel P during the sub-frame period SG. Also, an image signal corresponding to a gradation value of "b1" is written to each pixel P during the sub-frame period SB. Note that ST1, ST2, and ST3 in the diagram indicate the timing for outputting drive signals to the scanning lines G1 to GN (i.e., the timing for driving the pixel rows P1 to PN).

[0050] Writing of the image signal in each sub-frame period is performed individually for each of the multiple pixels P. The RGB gradation values ​​in the image signal for each pixel P correspond to the content of the image to be displayed. In the following description, an image signal corresponding to the gradation value of a certain color will simply be referred to as the image signal of that color.

[0051] In the example shown in Figure 10, SS1 in each sub-frame period SR, SG, or SB indicates a scanning period during which multiple pixel rows included in the display area 41a are scanned to write an image signal of the corresponding color. Specifically, during the scanning period SS1, the scanning circuit 32 supplies drive signals to the multiple pixel rows included in the display area 41a, and the signal output circuit 31 writes an image signal of the color corresponding to the sub-frame period to the multiple pixel rows. SS2 indicates a scanning period during which multiple pixel rows included in the display area 41b are scanned to write an image signal of the corresponding color. SS3 indicates a scanning period during which multiple pixel rows included in the display area 41c are scanned to write an image signal of the corresponding color.

[0052] The light source 60 is controlled by the light source control circuit 61 to light up the light emitter 63 corresponding to the color of the written image signal after each scanning period SS1, SS2, SS3. In Fig. 10, the lighting periods during which the light emitter 63R of the first color included in the light source 60 is lit are indicated by LR1, LR2, LR3, the lighting periods during which the light emitter 63G of the second color included in the light source 60 is lit are indicated by LG1, LG2, LG3, and the lighting periods during which the light emitter 63B of the third color included in the light source 60 is lit are indicated by LB1, LB2, LB3.

[0053] For example, the lighting period LR1 is a period during which the first-color light-emitting element 63R in light-emitting region A1 lights up after the scanning period SS1 of the sub-frame period SR (i.e., after the pixel rows in display region 41a are scanned to write the first-color image signal). The lighting period LR2 is a period during which the light-emitting element 63R in light-emitting region A2 lights up after the scanning period SS2 of the sub-frame period SR (i.e., after the pixel rows in display region 41b are scanned to write the first-color image signal). The lighting period LR3 is a period during which the light-emitting element 63R in light-emitting region A3 lights up after the scanning period SS3 of the sub-frame period SR (i.e., after the pixel rows in display region 41c are scanned to write the first-color image signal).

[0054] Similarly, lighting period LG1 is a period after scanning period SS1 of sub-frame period SG during which second-color light-emitting element 63G included in light-emitting region A1 is lit. Lighting period LG2 is a period after scanning period SS2 of sub-frame period SG during which light-emitting element 63G included in light-emitting region A2 is lit. Lighting period LG3 is a period after scanning period SS3 of sub-frame period SG during which light-emitting element 63G included in light-emitting region A3 is lit.

[0055] Similarly, lighting period LB1 is a period during which light-emitting element 63B of the third color (blue) included in light-emitting region A1 is lit after scanning period SS1 of sub-frame period SB. Light-emitting period LB2 is a period during which light-emitting element 63B included in light-emitting region A2 is lit after scanning period SS2 of sub-frame period SB. Light-emitting period LB3 is a period during which light-emitting element 63B included in light-emitting region A3 is lit in this frame period F after pixel rows included in display region 41c are scanned to write a third-color image signal during the previous frame period.

[0056] In the example of Figure 10, the lighting periods LR3, LG3, and LB3' after the scanning period SS3 are included in the next sub-frame period. By setting the output timing ST1, ST2, and ST3 of the drive signals to each pixel row earlier than in Figure 10 (i.e., by setting the length of each scanning period SS1 to SS3 shorter), the lighting periods LR3, LG3, and LB3' can be accommodated within the sub-frame periods SR, SG, and SB of the corresponding colors. In this case, the lighting period LB3 is included in the frame period preceding the frame period F.

[0057] The order in which image signals are written in one frame period F is not limited to the order of the first color, second color, and third color, and may be any order.

[0058] In this way, the field sequential method allows a single pixel P to display a color image by lighting up light-emitting elements of different colors in a time-division manner for each subframe period. Specifically, the field sequential method utilizes the afterimage of the human eye to allow humans to perceive a color image by superimposing an image of a different color on the afterimage of an image of one color. However, for example, if a user moves their line of sight after a first color image is displayed, the afterimage of the first color image moves along with the user's line of sight. As a result, the afterimage of the first color image may not match the image of the second color that is displayed next, resulting in an improper color mixing phenomenon (known as color breakup).

[0059] Therefore, in this embodiment, the lighting cycle of each of the light emitters 63R, 63G, and 63B is shortened in a region of the display area 41 that is determined based on the user's line of sight. Hereinafter, the region determined based on the user's line of sight will be referred to as a first display area. Furthermore, the region of the display area 41 other than the first display area will be referred to as a second display area.

[0060] In the first embodiment, the first display area is the display area 41b including the central part of the display panel 40. In the first embodiment, the display areas 41a and 41c are the second display areas.

[0061] Fig. 11 is a timing chart showing an example of the display operation of the liquid crystal display device DSP according to the first embodiment in one frame period F. Note that ST11, ST12, ST13, ST14, ST15, and ST16 in Fig. 11 indicate the timings at which drive signals are output to the scanning lines G1 to GN according to the first embodiment (i.e., the timings at which pixel rows P1 to PN are driven). Dashed lines ST1, ST2, and ST3 indicate the timings at which drive signals are output to the scanning lines G1 to GN according to the comparative example.

[0062] In this embodiment, each of the sub-frame periods SR, SB, and SG has a scanning period SS4 in addition to the above-mentioned scanning periods SS1, SS2, and SS3.

[0063] The scanning period SS4 is a period in which the pixel rows P1 to PN included in the display area 41 are scanned again after the pixel rows P1 to PN included in the display area 41 are scanned sequentially during the scanning periods SS1, SS2, and SS3. At this time, during the scanning period SS4, the pixel rows included in the display area 41b are scanned again to write an image signal of a color different from that of the scanning periods SS1, SS2, and SS3.

[0064] Specifically, during scanning periods SS1, SS2, and SS3 of the sub-frame period SR, pixel rows P1 to PN included in the display area 41 are sequentially scanned to write an image signal of a first color (red). Then, during scanning period SS4, pixel rows included in the display area 41b (first display area) are scanned again to write an image signal of a second color (green).

[0065] Similarly, in scanning periods SS1, SS2, and SS3 of sub-frame period SB, pixel rows P1 to PN included in display area 41 are sequentially scanned to write an image signal of a third color (blue). Then, in scanning period SS4, pixel rows included in display area 41b (first display area) are scanned again to write an image signal of a first color (red).

[0066] Similarly, during scanning periods SS1, SS2, and SS3 of the sub-frame period SG, pixel rows P1 to PN included in the display area 41 are sequentially scanned to write an image signal of a second color (green). Then, during scanning period SS4, pixel rows included in the display area 41b (first display area) are scanned again to write an image signal of a third color (blue).

[0067] Furthermore, one frame period F has lighting periods LR4, LG4, and LB4 in addition to the lighting periods LR1, LR2, LR3, LG1, LG2, LG3, LB1, LB2, and LB3 described above.

[0068] Specifically, the lighting period LG4 is the period during which the second color (green) light-emitting element 63G included in the light-emitting area A2 lights up after the scanning period SS4 of the sub-frame period SR (i.e., after the pixel rows included in the first display area are scanned to write the second color image signal).

[0069] The lighting period LR4 is a period during which the first color (red) light-emitting element 63R included in the light-emitting area A2 lights up after the scanning period SS4 of the sub-frame period SB (i.e., after the pixel rows included in the first display area are scanned to write the first color image signal).

[0070] The lighting period LB4 is a period in which the third color (blue) light-emitting element 63B included in the light-emitting area A2 lights up in this frame period F after the pixel rows included in the first display area are scanned in the previous frame period to write the third color image signal.

[0071] Note that it is also possible to set each output timing ST11-ST16 earlier than shown in Figure 11 (i.e., set each scanning period SS1-SS4 shorter), and include each lighting period LG4, LR4, LB4' after each scanning period SS4 in each sub-frame period SR, SB, SG. In this case, lighting period LB4 shown in Figure 11 is included in the previous frame period. Specifically, sub-frame period SR includes lighting periods LR1, LR2, LR3, LG4, sub-frame period SB includes lighting periods LB1, LB2, LB3, LR4, and sub-frame period SG includes lighting periods LG1, LG2, LG3, LB4'.

[0072] As shown in Figure 11, the lengths of the lighting periods LR2, LB2, LG2, LR4, LB4, and LG4 in the light-emitting area A2 that overlaps with the first display area are set to half (1 / 2) the lengths of the lighting periods LR1, LB1, LG1, LR3, LB3, and LG3 in the light-emitting areas A1 and A3 that overlap with the second display area.

[0073] In this embodiment, the number of times that display area 41b, which is the first display area, lights up in one frame period F is greater than the number of times that display areas 41a and 41c, which are the second display areas, light up. Therefore, if the lighting period of display area 41b and the lighting periods of display areas 41a and 41c were set to the same length, the total lighting time of display area 41b in one frame period F would be longer than the total lighting time of display areas 41a and 41c. As a result, a phenomenon occurs in which display area 41b appears brighter than the other display areas 41a and 41c. In this embodiment, by setting the length of the lighting period of display area 41b to half the length of the lighting periods of the other display areas 41a and 41c, the difference in lighting time between display areas 41a, 41b, and 41c in one frame period F is eliminated, and the phenomenon in which one area appears brighter can be prevented.

[0074] As described above, the field-sequential liquid crystal display device DSP according to this embodiment lights up the light emitters 63R, 63G, and 63B of each color once each within one frame period in the second display region (display regions 41a and 41c), and lights up the light emitters 63R, 63G, and 63B twice each within one frame period in the first display region (display region 41b). In other words, in the field-sequential liquid crystal display device DSP according to this embodiment, the lighting period of the light emitters 63R, 63G, and 63B in the first display region is shorter than the lighting period of the light emitters 63R, 63G, and 63B in the second display region.

[0075] This reduces the discrepancy between the afterimage of the first-color image and the second-color image to be displayed next in the area where the user's gaze is focused (display area 41b), preventing color breakup. Furthermore, visual resolution and color discrimination are high near the user's gaze and decrease as the distance from the gaze increases. By setting the area where the frequency is increased to be the area with high discrimination where the user's gaze is focused, color breakup can be prevented more efficiently than by increasing the frequency throughout the entire display area.

[0076] (Second embodiment) Next, a second embodiment will be described. The second embodiment differs from the first embodiment in that, in order to eliminate the difference in brightness among the display areas 41a, 41b, and 41c, the luminance value in the display area 41b (first display area) is set to half the luminance value in the display areas 41a and 41c (second display areas) rather than the lighting period.

[0077] 12 is a timing chart showing an example of display processing in one frame period F of the liquid crystal display device DSP according to the second embodiment. Note that in the second embodiment, similarly to the first embodiment, display area 41b is the first display area, and display areas 41a and 41c are the second display area. The lighting period of the light emitters of each color in the first display area is shorter than the lighting period of the light emitters of each color in the second display area.

[0078] One frame period F has a sub-frame period SR corresponding to the first color, a sub-frame period SG corresponding to the second color, and a sub-frame period SB corresponding to the third color. The sub-frame periods SR, SG, and SB have scanning periods SS1, SS2, SS3, and SS4, respectively.

[0079] 12, in the second embodiment, the lengths of the lighting periods LB4, LR2, LG4, LB2, LR4, and LG2 after an image signal is written to each pixel P included in the first display region are the same as the lengths of the lighting periods LR1, LR3, LB1, LB3, LG1, and LG3 after an image signal is written to each pixel P included in the second display region. On the other hand, the luminance of each light-emitting element emitting light in each lighting period LB4, LR2, LG4, LB2, LR4, and LG2 is half the luminance of each light-emitting element emitting light in each lighting period LR1, LR3, LB1, LB3, LG1, and LG3.

[0080] Specifically, in the second embodiment, for example, in a sub-frame period SR, the luminance of the light-emitting element 63R that lights up after a scanning period SS1 for the display region 41a (second display region) (i.e., a lighting period LR1) is LU1. In contrast, the luminance of the light-emitting element 63R that lights up after a scanning period SS2 for the display region 41b (first display region) (i.e., a lighting period LR2) is LU2 (LU2=LU1 / 2), which is half the luminance of LU1. The same is true for lighting periods LR4, LG2, LG4, LB2, and LB4.

[0081] As a result, even if the length of the lighting period is constant, the luminance value is the same in each of the display areas 41a, 41b, 41c that are lit in one frame period F. Therefore, as in the first embodiment, even if the number of times that the first display area is lit is greater than the number of times that the second display area is lit, it is possible to prevent the first display area from appearing brighter.

[0082] (Third embodiment) Next, a third embodiment will be described. In the first and second embodiments described above, as shown in Figures 11 and 12, a scanning period SS4 is provided in each sub-frame period, so that each scanning period SS1 to SS3 for sequentially scanning pixel rows P1 to PN must be shorter than in the comparative example. As the scanning period becomes shorter, the liquid crystal display device DSP is required to have processing power that enables it to write an image signal to each pixel P more quickly than in the comparative example.

[0083] The third embodiment differs from the first and second embodiments described above in that the length of the scanning periods SS2 and SS4 during which an image signal is written to each pixel P included in the first display area is the same as the scanning period SS2 during which an image signal is written to each pixel P included in the first display area in the comparative example, and that the length of the scanning periods SS1 and SS3 during which an image signal is written to each pixel P included in the second display area is half that of the scanning period SS2.

[0084] 13 is a timing chart showing an example of the display operation in one frame period F of the liquid crystal display device DSP according to the third embodiment. In the third embodiment, similarly to the first embodiment, the display area 41b is the first display area, and the display areas 41a and 41c are the second display areas. The lighting period of the light emitters of each color in the first display area is shorter than the lighting period of the light emitters of each color in the second display area. Furthermore, the number of pixel rows included in each of the display areas 41a, 41b, and 41c is the same.

[0085] One frame period F has a sub-frame period SR corresponding to the first color, a sub-frame period SG corresponding to the second color, and a sub-frame period SB corresponding to the third color. The sub-frame periods SR, SG, and SB have scanning periods SS1, SS2, SS3, and SS4, respectively.

[0086] In the figure, ST21, ST22, ST23, ST24, ST25, and ST26 indicate the timings at which drive signals are output to the scanning lines G1 to GN according to the third embodiment. Dashed lines ST1, ST2, and ST3 indicate the timings at which drive signals are output to the scanning lines G1 to GN according to the comparative example.

[0087] Here, during the scanning period SS1, the multiple pixel rows included in the display area 41a (second display area) are scanned two consecutive rows at a time. That is, in the display area 41a, drive signals are output to two consecutive scanning lines GL at the same timing. This allows the length of the scanning period SS1 to be half the length of the scanning period SS1 in the comparative example. In other words, the length of the scanning period SS1 can be made shorter than the length of the scanning period SS1 in the first and second embodiments.

[0088] On the other hand, during the scanning period SS2, the pixel rows included in the display area 41b (first display area) are scanned sequentially one row at a time. That is, in the display area 41b, drive signals are output to each scanning line GL sequentially. This allows the length of the scanning period SS2 to be the same as the length of the scanning period SS2 in the comparative example. In other words, the length of the scanning period SS2 can be made longer than the length of the scanning period SS2 in the first and second embodiments.

[0089] Similarly, during the scanning period SS3, two consecutive pixel rows included in the display area 41c (second display area) are simultaneously scanned. That is, in the display area 41c, drive signals are output to two consecutive scanning lines GL at the same time. This allows the length of the scanning period SS3 to be half the length of the scanning period SS3 in the comparative example. In other words, the length of the scanning period SS3 can be made shorter than the length of the scanning period SS3 in the first and second embodiments.

[0090] On the other hand, during the scanning period SS4, the pixel rows included in the display area 41b (first display area) are scanned one by one. That is, in the display area 41b, drive signals are output to each scanning line GL sequentially. At this time, the length of the scanning period SS4 is the same as the length of the scanning period SS2 in the comparative example. That is, the length of the scanning period SS4 can be made longer than the length of the scanning period SS4 in the first and second embodiments.

[0091] As described above, the field-sequential liquid crystal display device DSP according to the third embodiment sequentially scans a plurality of pixel rows included in the first display region and simultaneously scans a plurality of consecutive pixel rows in the second display region. In other words, the field-sequential liquid crystal display device DSP according to the third embodiment controls the lengths of the scanning periods SS1 and SS3 during which image signals are written to each pixel P included in the display regions 41 a and 41 c (second display region) to be half the lengths of the scanning periods SS1 and SS3 during which pixel signals are written to each pixel P included in the display regions 41 a and 41 c in the comparative example.

[0092] As a result, the lengths of the scanning periods SS2 and SS4 during which image signals are written to each pixel P included in the display region 41b (first display region) can be made the same as the length of the scanning period SS2 during which image signals are written to each pixel P included in the display region 41b in the comparative example. This allows sufficient time to be provided for writing image signals to each pixel P included in the first display region, so that image signals can be written to each pixel P included in the first display region even if the processing capability of the liquid crystal display device DSP is similar to that of the comparative example. In other words, image signals can be written to each pixel P included in the first display region even if the processing capability of the liquid crystal display device DSP is lower than that of the liquid crystal display devices DSP according to the first and second embodiments.

[0093] Note that the image display in the second display area in the third embodiment is a low-resolution display in which the resolution in the second direction Y is lower than the original resolution of the display panel 40. However, as described above, by sequentially scanning the scanning lines GL of each pixel row in the first display area where the user's line of sight is concentrated, it is possible to maintain high-resolution display in the first display area with high discrimination.

[0094] 13, the example has been described in which two rows are scanned at a time, assuming that the number of pixel rows included in display areas 41a, 41b, and 41c is the same, but the number of pixel rows scanned simultaneously is not limited to two. For example, if the number of pixel rows included in the first display area is greater than that of the second display area, even if the pixel rows included in the second display area are scanned two rows at a time, it may not be possible to scan all of the pixel rows within one frame period F. In this case, by increasing the number of pixel rows included in the second display area that are scanned simultaneously, depending on the number of pixel rows included in the first display area, it is possible to provide time for writing an image signal to each pixel P included in the first display area.

[0095] In the example of Figure 13, an example is shown in which each lighting period in the first display area is shortened as in the first embodiment to prevent the first display area from appearing brighter than the second display area, but it is also possible to halve the brightness of the light lit in the first display area as in the second embodiment.

[0096] (Fourth embodiment) Next, a fourth embodiment will be described. In the fourth embodiment, the first display area is changed according to the gaze position of the user detected by the gaze detection sensor 55.

[0097] 14 and 15 are schematic diagrams showing an example of the relative relationship between the display panel 40 and the user's eye E. When a user wears the head-mounted display 1, an image displayed on the display panel 40 is focused on the retina of the user's eye E by a lens (not shown). The gaze detection sensor 55 is disposed, for example, inside the housing 51 of the head-mounted display 1, and tracks the gaze position (viewpoint) of the user's eye E in the second direction Y. In the fourth embodiment, of the display areas 41a, 41b, and 41c, an area including the gaze position in the second direction Y where the user's gaze is detected is set as the first display area.

[0098] 14, when the detected position of the user's gaze is at position 0 [deg] in the second direction Y of display area 41, display area 41b including position 0 [deg] in the second direction Y is set as the first display area. Note that display areas 41a and 41c other than display area 41b are set as the second display area. In this case, the liquid crystal display device DSP operates, for example, as described in the first to third embodiments.

[0099] 15, when the detected position of the user's gaze is at +40 [deg] in the second direction Y of display area 41, display area 41a including position +40 [deg] in the second direction Y is set as the first display area. Display areas 41b and 41c other than display area 41a are set as the second display area. In this case, the liquid crystal display device DSP operates as described below.

[0100] 16 is a timing chart showing an example of the display operation of the liquid crystal display device DSP according to the fourth embodiment in one frame period F. In the example of FIG. 16, it is assumed that the display area 41a is set as the first display area.

[0101] One frame period F has a sub-frame period SR corresponding to the first color, a sub-frame period SG corresponding to the second color, and a sub-frame period SB corresponding to the third color.

[0102] In the fourth embodiment, the sub-frame periods SR, SG, and SB have scanning periods SS5, SS6, SS7, and SS8, respectively. When the display region 41a is set as the first display region, in each of the sub-frame periods SR, SG, and SB, scanning is performed starting from the plurality of pixel rows included in the display region 41c, not the plurality of pixel rows included in the display region 41a.

[0103] That is, during the scanning period SS5 in each of the sub-frame periods SR, SG, and SB, a plurality of pixel rows included in the display region 41c (second display region) are scanned to write an image signal of the corresponding color. During the scanning period SS6, a plurality of pixel rows included in the display region 41a (first display region) are scanned to write an image signal of the corresponding color. During the scanning period SS7, a plurality of pixel rows included in the display region 41b (second display region) are scanned to write an image signal of the corresponding color. During the scanning period SS8, a plurality of pixel rows included in the display region 41a (first display region) are scanned again after the pixel rows P1 to PN included in the display region 41 are sequentially scanned during the scanning periods SS5, SS6, and SS7. During this scanning period SS8, a plurality of pixel rows included in the display region 41a are scanned again to write an image signal of a color different from that of the scanning periods SS5, SS6, and SS7.

[0104] Specifically, for example, in scanning periods SS5, SS6, and SS7 of the sub-frame period SR, pixel rows P1 to PN included in the display area 41 are sequentially scanned to write an image signal of a first color (red). Then, in scanning period SS8, pixel rows included in the display area 41a (first display area) are scanned again to write an image signal of a second color (green).

[0105] Similarly, during scanning periods SS5, SS6, and SS7 of sub-frame period SB, pixel rows P1 to PN included in display area 41 are sequentially scanned to write an image signal of a third color (blue). Then, during scanning period SS8, pixel rows included in display area 41a (first display area) are scanned again to write an image signal of a first color (red).

[0106] Similarly, during scanning periods SS5, SS6, and SS7 of the sub-frame period SG, pixel rows P1 to PN included in the display area 41 are sequentially scanned to write an image signal of a second color (green). Then, during scanning period SS8, pixel rows included in the display area 41a (first display area) are scanned again to write an image signal of a third color (blue).

[0107] 14 indicate the timings at which drive signals are output to the scanning lines G1 to GN (i.e., the timings at which pixel rows P1 to PN are driven) according to the fourth embodiment. Dashed lines ST1, ST2, and ST3 indicate the timings at which drive signals are output to the scanning lines G1 to GN according to the comparative example. In the fourth embodiment, as in the third embodiment, multiple pixel rows included in the first display region are sequentially scanned, and multiple consecutive pixel rows in the second display region are simultaneously scanned, thereby making the length of the scanning period during which an image signal is written to each pixel P included in the first display region longer than the length of the scanning period during which an image signal is written to each pixel P included in the second display region. As in the first and second embodiments, the length of the scanning period during which an image signal is written to each pixel P included in the first display region may be the same as the length of the scanning period during which an image signal is written to each pixel P included in the second display region.

[0108] Furthermore, the light source control circuit 61 controls the plurality of light emitters 63R, 63G, and 63B included in the light source 60 to light up in accordance with the written image signals after each of the scanning periods SS5, SS6, SS7, and SS8. That is, the liquid crystal display device DSP according to the fourth embodiment lights up each of the light emitters 63R, 63G, and 63B once within one frame period in the second display region (display region 41b and 41c), and lights up each of the light emitters 63R, 63G, and 63B twice within one frame period in the first display region (display region 41a).

[0109] In the example of Figure 16, as in the first embodiment, the lighting period of each light-emitting element 63R, 63G, 63B in the first display area is half the lighting period of each light-emitting element 63R, 63G, 63B in the second display area, but as in the second embodiment, the brightness of the light lit in the first display area may be half the brightness of the light lit in the second display area.

[0110] As described above, the field-sequential liquid crystal display device DSP according to the fourth embodiment detects the user's line of sight and changes the first display region for which the lighting cycle is increased in accordance with the detected line of sight of the user, thereby preventing color breakup even if the user's line of sight is concentrated on a region other than the center.

[0111] In the example of Figure 16, we have described a case where display area 41a is set as the first display area and multiple pixel rows are scanned in the order of pixel rows included in display area 41c, pixel rows included in display area 41a (first display area), and pixel rows included in display area 41b, but the multiple pixel rows may also be scanned in the order of pixel rows included in display area 41b, pixel rows included in display area 41a (first display area), and pixel rows included in display area 41c.

[0112] Furthermore, when display area 41c is set as the first display area, the pixel rows are scanned in the following order: pixel rows included in display area 41c, pixel rows included in display area 41b (first display area), pixel rows included in display area 41a, or pixel rows included in display area 41a, pixel rows included in display area 41b (first display area), pixel rows included in display area 41c. Note that, in order to maintain equal lighting periods, it is desirable that the first display area be scanned second.

[0113] The field sequential liquid crystal display device DSP according to each embodiment has been described as a liquid crystal display device used in the head mounted display 1, but may be used for other purposes.

[0114] According to at least one of the embodiments described above, it is possible to provide a field sequential liquid crystal display device that can suppress the occurrence of color breakup.

[0115] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents. [Explanation of symbols]

[0116] 1...head mounted display, 11...pixel electrode, 12...switching element, 20...signal processing circuit, 31...signal output circuit, 32...scanning circuit, 40...display panel, 41...display area, 53...interface, 54...multi-axis sensor, 55...gaze detection sensor, 57...substrate, 60...light source, 61...light source control circuit, 62...light emitting module, 63R, 63G, 63B...light emitters, DSP, DSPR, DSPL...liquid crystal display device, DTL...signal line, GL...scanning line, P1 to PN...pixel row, F...frame period, SR, SG, SB...subframe period, SS1 to SS8...scanning period.

Claims

1. a display panel having a display area in which a plurality of pixels are arranged in a matrix; a light source that emits light toward the display panel and includes a first color light emitter, a second color light emitter, and a third color light emitter; a light source control circuit for controlling the operation of each of the light emitters; Equipped with the display area includes a first display area determined based on a user's line of sight and a second display area excluding the first display area; The light source control circuit With regard to the lighting cycle for sequentially lighting the light emitters, the operation of the light emitters is controlled so that the lighting cycle of the light emitters that irradiate light toward the first display area is shorter than the lighting cycle of the light emitters that irradiate light toward the second display area. Field sequential liquid crystal display device.

2. a scanning circuit that scans a plurality of pixel rows included in the display area and supplies a drive signal; one frame period during which one screen is displayed in the display area includes a first sub-frame period, a second sub-frame period, and a third sub-frame period; The scanning circuit during the first sub-frame period, the pixel rows included in the display area are sequentially scanned to write the image signal of the first color, and then the pixel rows included in the first display area are scanned again to write the image signal of the second color; in the second sub-frame period, after sequentially scanning the pixel rows included in the display area to write the image signal of the third color, scanning the pixel rows included in the first display area again to write the image signal of the first color; In the third sub-frame period, the pixel rows included in the display area are sequentially scanned to write the image signal of the second color, and then the pixel rows included in the first display area are scanned again to write the image signal of the third color.

2. The field sequential liquid crystal display device according to claim 1.

3. each of the sub-frame periods includes a scanning period in which an image signal of a predetermined color is written to each of the pixels, and a lighting period in which a light-emitting element of the predetermined color is turned on after the scanning period; The light source control circuit controlling the operation of each of the light emitters so that a lighting period after an image signal of a predetermined color is written to the pixels included in the first display region is half of a lighting period after an image signal of a predetermined color is written to the pixels included in the second display region; 3. The field sequential liquid crystal display device according to claim 2.

4. each of the sub-frame periods includes a scanning period in which an image signal of a predetermined color is written to each of the pixels, and a lighting period in which a light-emitting element of the predetermined color is turned on after the scanning period; The light source control circuit controlling the operation of each light emitter so that the luminance of the light emitter that is turned on during a lighting period after an image signal of a predetermined color is written to the pixel included in the first display region is half the luminance of the light emitter that is turned on during a lighting period after an image signal of a predetermined color is written to the pixel included in the second display region; 3. The field sequential liquid crystal display device according to claim 2.

5. The scanning circuit sequentially scanning a plurality of pixel rows included in the first display area; Simultaneously scanning a plurality of consecutive pixel rows in the second display area 3. The field sequential liquid crystal display device according to claim 2.

6. the light source includes a first light-emitting region overlapping the first display region and a second light-emitting region overlapping the second display region; The light source control circuit the scanning circuit sequentially scans each of the pixel rows included in the first display area to write an image signal of a predetermined color, and then lights up the light emitters of the predetermined color included in the first light-emitting area; and after the scanning circuit sequentially scans each of the pixel rows included in the second display area to write an image signal of a predetermined color, controlling the operation of each of the light emitters included in the second light-emitting area to light up the light emitters of the predetermined color.

3. The field sequential liquid crystal display device according to claim 2.

7. the light source includes a plurality of light emitting modules arranged in a matrix; Each of the light-emitting modules includes a light-emitting body of the first color, a light-emitting body of the second color, and a light-emitting body of the third color.

2. The field sequential liquid crystal display device according to claim 1.

8. The light source is a plurality of light emitting modules each including a first color light emitting body that emits a first color laser light, a second color light emitting body that emits a second color laser light, and a third color light emitting body that emits a third color laser light; a plurality of light guide plates provided for the light emitting modules, the light guide plates including a side surface onto which the laser light is incident and a main surface from which the laser light is emitted; The plurality of light guide plates include a first light guide plate whose main surface faces a first display area and a second light guide plate whose main surface faces a second display area.

2. The field sequential liquid crystal display device according to claim 1.

9. The first display area is Among the plurality of pixel rows included in the display area, the area includes a pixel row at the center of the display area.

2. The field sequential liquid crystal display device according to claim 1.

10. a detection sensor for detecting a concentration area on the display area where the user's gaze is concentrated; The first display area is an area including the concentration area.

2. The field sequential liquid crystal display device according to claim 1.

Images