Liquid crystal display device

Abstract

To provide a liquid crystal display device with which it is possible to suppress the occurrence of a color break.SOLUTION: Provided is a liquid crystal display device in which the turn-on start timing of a R-color light source that is turned on in a first field period (phase1) is controlled to be the start timing of this period, and the luminance of light emitted from the R-color light source in this period is controlled to be a prescribed height by which the light quantity of R-color that decreases as the turn-on start timing of the R-color light source is delayed by a prescribed time in this period is compensated. The turn-on start timing of a B-color light source that is turned on in a third field period (phase3) is controlled to be advanced by a prescribed time from the end timing of this period, and the luminance of light emitted from the B-color light source in this period is controlled to be a prescribed height by which the light quantity of B-color that decreases as the turn-on end timing of the B-color light source is advanced by a prescribed time in this period is compensated.SELECTED DRAWING: Figure 5(a)

Description

[Technical Field]

[0001] The present invention relates to a liquid crystal display device. [Background technology]

[0002] Liquid crystal display devices have advantages such as the ability to be made thinner and smaller and to be driven with low power consumption, and so in recent years they have been widely used as image display devices in the field of small electronic devices such as mobile devices, projectors, viewfinders, HMDs, and HUDs.

[0003] In a liquid crystal display device that displays images using field sequential driving, three light sources, red (R color), green (G color), and blue (B color), are sequentially selected and made to emit light, and the driving of the liquid crystal panel is controlled in synchronization with this, thereby displaying a color image (see, for example, Patent Document 1).

[0004] Liquid crystal display devices that display images using field sequential driving use, for example, a liquid crystal panel (Surface Stabilized Ferroelectric Liquid Crystal Panel) constructed by filling a narrow gap between a pair of substrates with ferroelectric liquid crystal. This liquid crystal panel is suitable for field sequential driving because its optical characteristics change quickly in response to the applied voltage.

[0005] Fig. 1 shows an example of a liquid crystal panel, with (a) an AA cross-sectional view and (b) a top view. The liquid crystal panel shown in Fig. 1 includes a transparent glass substrate 1, an ITO film 2 as a transparent electrode, an organic alignment film 3 formed on the ITO film 2, a silicon substrate 4, pixel electrodes 5, an organic alignment film 6 and a SiO thin film 7 formed on the pixel electrodes 5, and a liquid crystal 8 filled between the glass substrate 1 and the silicon substrate 4.

[0006] In this liquid crystal panel, before a voltage is applied to the liquid crystal 8, the orientation of the liquid crystal molecules is aligned in one direction by the alignment restricting force of the organic alignment film 3 and the organic alignment film 6. Normally, when a voltage is applied to the liquid crystal 8, the orientation of the liquid crystal molecules changes (switches), and when the voltage is no longer applied to the liquid crystal 8, the orientation of the liquid crystal molecules returns to the state where they were aligned in one direction. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2021-162651 Summary of the Invention [Problem to be solved by the invention]

[0008] A liquid crystal display device that displays images by field sequential driving has a problem in that color breakup occurs in the image.

[0009] An object of the present invention is to provide a liquid crystal display device that can suppress the occurrence of color breakup. [Means for solving the problem]

[0010] a liquid crystal display device comprising a liquid crystal panel and a light source supplying light of a first color, a second color, and a third color to the liquid crystal panel, the liquid crystal display device displaying one color image in one frame period by field sequential driving, wherein the one frame period is provided with a first field period displaying a first image based on light of the first color, a second field period displaying a second image based on light of the second color, and a third field period displaying a third image based on light of the third color, which are consecutive and congruent with each other to display one color image, and wherein the light source, which is turned on in a field period which is provided first on a time axis among the first field period, the second field period, and the third field period, is controlled so that the lighting start timing is delayed by a predetermined time from the start timing of the field period; Furthermore, the brightness of the light emitted from the light source that is turned on during the field period is controlled to be a predetermined height that compensates for the decrease in the amount of light due to the timing at which the light source starts to turn on being delayed by the predetermined time during the field period, the timing at which the light source that is turned on during the third field period on the time axis out of the first field period, the second field period, and the third field period ends is controlled to be advanced by a predetermined time from the end timing of the field period, and the brightness of the light emitted from the light source that is turned on during the field period is controlled to be a predetermined height that compensates for the decrease in the amount of light due to the timing at which the light source stops to turn on being advanced by the predetermined time during the field period.

[0011] The liquid crystal display device may be such that the one frame period includes a fourth field period that is consecutive to the first field period, the second field period, and the third field period and that displays a fourth image based on light of one of the first color, the second color, and the third color, and the order of the first field period, the second field period, the third field period, and the fourth field period is set so that the color combination of three consecutive field periods included in one sequence made up of at least the four field periods is a combination of the first color, the second color, and the third color at any position in the sequence.

[0012] The liquid crystal display device may be such that the one frame period includes a fifth field period that is consecutive to the first field period, the second field period, the third field period, and the fourth field period and that displays a fifth image based on light of one of the first color, the second color, and the third color, and the order of the first field period, the second field period, the third field period, the fourth field period, and the fifth field period is set so that the color combination of three consecutive field periods included in one sequence made up of at least five field periods is a combination of the first color, the second color, and the third color at any position in the sequence.

[0013] The liquid crystal display device may be one in which the first color is red, the second color is green, and the third color is blue. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a liquid crystal display device that can suppress the occurrence of color breakup. [Brief explanation of the drawings]

[0015] [Figure 1]1A and 1B are a cross-sectional view taken along line AA and a top view, respectively, showing an example of a liquid crystal panel. [Figure 2] 4 is a timing chart conceptually showing drive waveforms for field sequential driving in the first embodiment of the present invention. [Figure 3(a)] 10 is a timing chart conceptually showing drive waveforms for field sequential driving (triple speed driving) in Example 2 of the present invention. [Figure 3(b)] 10 is a timing chart conceptually showing drive waveforms for field sequential driving (quadruple speed driving) in Example 3 of the present invention. [Figure 3(c)] 10 is a timing chart conceptually showing drive waveforms for field sequential driving (five-times speed driving) in Example 4 of the present invention. [Figure 4] FIG. 10 is a diagram conceptually illustrating the relationship between the order of positive periods and the color of an image in an embodiment of the present invention. [Figure 5(a)] 4 is a timing chart conceptually showing a driving waveform of a light source in the first embodiment of the present invention. [Figure 5(b)] 10 is a timing chart conceptually showing a modified example of the driving waveform of the light source in the first embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] A liquid crystal display device according to an embodiment of the present invention includes a light source such as an LED that emits light of each color (red, green, and blue, RGB), a liquid crystal panel using ferroelectric liquid crystal, and a drive circuit that drives the light source and the liquid crystal panel. The liquid crystal panel is driven by a field sequential method to display one color image per frame period. One frame period includes three field periods in which monochromatic images corresponding to each color of RGB are displayed, and one color image is displayed over these three field periods. The light source repeats a cycle of sequentially illuminating the liquid crystal panel from the front or rear with the light of each color emitted from the light source, and the liquid crystal panel changes the optical modulation state of the liquid crystal in synchronization with this cycle. The liquid crystal panel may be, for example, similar to the liquid crystal panel shown in FIG. 1, but is not limited thereto. [Example]

[0017] Fig. 2 is a timing chart conceptually showing drive waveforms for field sequential driving in Example 1 of the present invention. In the field sequential driving shown in Fig. 2, one frame period (Frame) is made up of six consecutive field periods, which are arranged in order from the left on the time axis: Positive period "R", Positive period "G", Positive period "B", Negative period "r", Negative period "g", and Negative period "b". These six field periods are sometimes called Phases 1 to 6, respectively.

[0018] In FIG. 2, the period marked "R" represents a positive period corresponding to the on-period of the R light source, the period marked "G" represents a positive period corresponding to the on-period of the G light source, the period marked "B" represents a positive period corresponding to the on-period of the B light source, the period marked "r" represents a negative period corresponding to the off-period of the R light source, the period marked "g" represents a negative period corresponding to the off-period of the G light source, and the period marked "b" represents a negative period corresponding to the off-period of the B light source. In each of the "R," "G," and "B" periods, the light source of the corresponding color is turned on and a predetermined voltage is applied to the liquid crystal panel, thereby performing display drive to display a monochromatic image based on the light of the corresponding color. These three monochromatic images are mixed to display a single color image. In the state shown in FIG. 2, a white image of maximum grayscale is displayed. During each of the "r", "g", and "b" periods, the light source is turned off, and an inverted voltage (a voltage with the same amplitude but opposite polarity) of the voltage applied to the liquid crystal during the positive period of the corresponding color is applied to the liquid crystal panel, thereby performing inversion driving (DC balance driving) to maintain the electrical balance of the liquid crystal. Note that inversion driving is not essential and may be omitted as appropriate.

[0019] FIG. 5(a) is a timing chart conceptually illustrating the drive waveforms of the light source in Example 1 of the present invention. In FIG. 5(a), the width (horizontal axis) of the period marked "R" represents the length of time the R light source is on during Phase 1, the width (horizontal axis) of the period marked "G" represents the length of time the G light source is on during Phase 2, and the width (horizontal axis) of the period marked "B" represents the length of time the B light source is on during Phase 3. The height (vertical axis) of each of the "R," "G," and "B" periods represents the magnitude of the current supplied to the light source (LED) of the corresponding color, i.e., the luminance of the light emitted from the light source. If the current supplied to the light source increases, the luminance of the light emitted from the light source increases, and if the current supplied to the light source decreases, the luminance of the light emitted from the light source decreases.

[0020] In the prior art, as shown in the upper diagram of FIG. 5(a), the timing at which the light sources start to light up during each of Phases 1 to 3 is controlled to coincide with the timing at which Phases 1 to 3 start, respectively, and the timing at which the light sources stop to light up during each of Phases 1 to 3 is controlled to coincide with the timing at which Phases 1 to 3 end, respectively. The luminance of the light emitted from the light sources during each of Phases 1 to 3 is controlled to be equal. That is, the width of the "R" period during which the R light source is on, the width of the "G" period during which the G light source is on, and the width of the "B" period during which the B light source is on are controlled to be equal to each other. Furthermore, the height of the "R" period during which the R light source is on, the height of the "G" period during which the G light source is on, and the height of the "B" period during which the B light source is on are controlled to be equal to each other.

[0021] In contrast, in Example 1, as shown in the lower diagram of FIG. 5( a), the timing at which the R light source starts to turn on during Phase 1 is controlled to be delayed by a predetermined time from the start of Phase 1, and the timing at which the R light source stops turning on during Phase 1 is controlled to coincide with the end of Phase 1, as in the conventional technology. That is, the length of time that the R light source is turned on during Phase 1 is controlled to be shortened by a predetermined length from the start of Phase 1 toward the end of Phase 1, compared to the conventional technology. The luminance of the light emitted from the R light source during Phase 1 is controlled to be a predetermined luminance that is higher than the luminance of the light emitted from the R light source during Phase 1 in the conventional technology, so that the amount of R light that is reduced by shortening the turn-on time of the R light source during Phase 1 is compensated for, thereby obtaining an appropriate gradation of the R image.

[0022] Furthermore, in Example 1, as shown in the lower diagram of FIG. 5( a), the timing at which the G-color light source starts to light up during Phase 2 is controlled to coincide with the timing at which Phase 2 starts, as in the conventional technology, and the timing at which the G-color light source stops to light up during Phase 2 is controlled to coincide with the timing at which Phase 2 ends, as in the conventional technology. That is, the length of time that the G-color light source is turned on during Phase 2 is controlled to be equal to the length of Phase 2, as in the conventional technology. Furthermore, the luminance of the light emitted from the G-color light source during Phase 2 is controlled to be equal to the luminance of the light emitted from the G-color light source during Phase 2 in the conventional technology.

[0023] Furthermore, in Example 1, as shown in the lower diagram of FIG. 5( a), the timing at which the B light source starts to turn on during Phase 3 is controlled to coincide with the timing at which Phase 3 starts, as in the conventional technology, and the timing at which the B light source stops turning on during Phase 3 is controlled to be earlier than the timing at which Phase 3 ends by a predetermined time. That is, the length of time that the B light source is turned on during Phase 3 is controlled to be shorter by a predetermined length compared to the conventional technology from the timing at which Phase 3 ends toward the timing at which Phase 3 starts. The luminance of the light emitted from the B light source during Phase 3 is controlled to be a predetermined luminance higher than the luminance of the light emitted from the B light source during Phase 3 in the conventional technology, so that the reduced amount of B light due to the shorter turn-on time of the B light source during Phase 3 compared to the conventional technology is compensated for, thereby obtaining an appropriate gradation of the B image.

[0024] In Example 1 shown in FIG. 5(a), the width of the period "R" when the R-color light source is on and the width of the period "B" when the B-color light source is on are controlled to be equal to each other, and the height of the period "R" when the R-color light source is on and the height of the period "B" when the B-color light source is on are controlled to be equal to each other, but the present invention is not limited to this embodiment and other embodiments may be adopted as appropriate.

[0025] As a result of the above, in Example 1, the period "R" during which the R light source is on and the period "B" during which the B light source is on are closer to each other on the time axis, sandwiching the period "G" during which the G light source is on. This makes it easier for the R, G, and B images to visually overlap, thereby suppressing the occurrence of color breakup.

[0026] Fig. 5(b) is a timing chart conceptually showing a modified example of the driving waveform of the light source in the first embodiment of the present invention. The driving waveform of the light source in the first embodiment may be as shown in the lower diagram of Fig. 5(b). In the drive waveform of the light source in Example 1 shown in FIG. 5(b), compared to the drive waveform of the light source in Example 1 shown in FIG. 5(a) described above, the timing at which the R-color light source starts to turn on during Phase 1 is controlled to be further delayed, and the brightness of the light emitted from the R-color light source during Phase 1 is controlled to be further increased. The timing at which the G-color light source starts to turn on during Phase 2 is controlled to be delayed by a predetermined time from the start of Phase 2. The timing at which the G-color light source stops turning on during Phase 2 is controlled to be advanced by a predetermined time from the end of Phase 2. The brightness of the light emitted from the G-color light source during Phase 2 is controlled to be a predetermined brightness that is higher than the brightness of the light emitted from the G-color light source during Phase 2 in the prior art. The timing at which the B-color light source stops turning on during Phase 3 is controlled to be further advanced, and the brightness of the light emitted from the B-color light source during Phase 3 is controlled to be further increased.

[0027] In Example 1 shown in FIG. 5(b), the width of the period "R" when the R-color light source is on, the width of the period "G" when the G-color light source is on, and the width of the period "B" when the B-color light source is on are controlled to be different from one another, and the height of the period "R" when the R-color light source is on, the height of the period "G" when the G-color light source is on, and the height of the period "B" when the B-color light source is on are controlled to be different from one another, but the present invention is not limited to this embodiment and other embodiments may be adopted as appropriate.

[0028] When the driving waveform of the light source in the first embodiment shown in FIG. 5(b) is used, the same effect as when the driving waveform of the light source in the first embodiment shown in FIG. 5(a) described above is used can be obtained. [Example]

[0029] Fig. 3(a) is a timing chart conceptually showing drive waveforms of field sequential driving (triple speed driving) in Example 2 of the present invention. In the field sequential driving (triple speed driving) in Example 2 shown in Fig. 3(a), one frame period (Frame) is made up of 12 consecutive field periods (Phase 1 to 12 respectively) arranged in order from the left on the time axis: Positive period "R", Positive period "G", Positive period "B", Negative period "r", Positive period "G", Positive period "B", Positive period "R", Negative period "g", Positive period "B", Positive period "R", Positive period "G", and Negative period "b". Note that the operation in each field period is the same as in Example 1.

[0030] In the second embodiment, for example, during the period of phases 1 to 3 shown in FIG. 3(a), a driving waveform similar to the driving waveform of the light source in the first embodiment shown in FIG. 5(a) or FIG. 5(b) described above is applied while maintaining the overall shape and the order of the light sources; further, during the period of phases 5 to 7 shown in FIG. 3(a), a driving waveform similar to the driving waveform of the light source in the first embodiment shown in FIG. 5(a) or FIG. 5(b) described above is applied after replacing the order of the light sources from RGB to GBR while maintaining the overall shape; and further, during the period of phases 9 to 11 shown in FIG. 3(a), a driving waveform similar to the driving waveform of the light source in the first embodiment shown in FIG. 5(a) or FIG. 5(b) described above is applied after replacing the order of the light sources from RGB to BRG while maintaining the overall shape, thereby achieving the same effect as in the first embodiment. [Example]

[0031] 3B is a timing chart conceptually showing drive waveforms of field sequential driving (quadruple speed driving) in Example 3 of the present invention. In the field sequential driving (quadruple speed driving) in Example 3 shown in FIG. 3B, one frame period (Frame) is made up of 15 consecutive field periods (Phase 1 to 15 respectively) arranged in order from the left on the time axis: Positive period "R", Positive period "G", Positive period "B", Positive period "R", Negative period "r", Positive period "G", Positive period "B", Positive period "R", Positive period "G", Negative period "g", Positive period "B", Positive period "R", Positive period "G", Positive period "B", Negative period "b". Note that the operation in each field period is the same as in Example 1.

[0032] In Example 3, for example, during the period of phases 1 to 3 shown in Figure 3(b), a driving waveform similar to the driving waveform of the light source in Example 1 shown in Figure 5(a) or Figure 5(b) described above is applied while maintaining its overall shape and the order of the light sources; further, during the period of phases 6 to 8 shown in Figure 3(b), a driving waveform similar to the driving waveform of the light source in Example 1 shown in Figure 5(a) or Figure 5(b) described above is applied after replacing the order of the light sources from RGB to GBR while maintaining its overall shape; and further, during the period of phases 11 to 13 shown in Figure 3(b), a driving waveform similar to the driving waveform of the light source in Example 1 shown in Figure 5(a) or Figure 5(b) described above is applied after replacing the order of the light sources from RGB to BRG while maintaining its overall shape, thereby achieving the same effect as in Example 1.

[0033] Furthermore, in Example 3, for example, during the period of phases 2 to 4 shown in FIG. 3(b), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-described FIG. 5(a) or FIG. 5(b) is applied after changing the order of the light sources from RGB to GBR while maintaining the overall shape; further, during the period of phases 7 to 9 shown in FIG. 3(b), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-described FIG. 5(a) or FIG. 5(b) is applied after changing the order of the light sources from RGB to BRG while maintaining the overall shape; and further, during the period of phases 12 to 14 shown in FIG. 3(b), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-described FIG. 5(a) or FIG. 5(b) is applied while maintaining the overall shape and the order of the light sources, thereby achieving the same effect as Example 1.

[0034] In addition, in Example 3, the combinations of phases to which the same driving waveforms as those of the light source in Example 1 shown in Figure 5(a) or 5(b) above are applied are not limited to the above combinations, and other combinations may be selected as appropriate. [Example]

[0035] Fig. 3(c) is a timing chart conceptually showing drive waveforms of field sequential driving (5x speed drive) in Example 4 of the present invention. In the field sequential driving (5x speed drive) in Example 4 shown in Fig. 3(c), one frame period (Frame) is made up of 18 consecutive field periods (Phase 1 to 18 respectively) arranged in order from the left on the time axis: Positive period "R", Positive period "G", Positive period "B", Positive period "R", Positive period "G", Negative period "r", Positive period "G", Positive period "B", Positive period "R", Positive period "G", Positive period "B", Negative period "g", Positive period "B", Positive period "R", Positive period "G", Positive period "B", Positive period "R", and Negative period "b". The operation in each field period is the same as in the first embodiment.

[0036] In Example 4, for example, during the period of phases 1 to 3 shown in Figure 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-mentioned Figure 5(a) or Figure 5(b) is applied while the order of the light sources remains RGB, and further during the period of phases 7 to 9 shown in Figure 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-mentioned Figure 5(a) or Figure 5(b) is applied after the order of the light sources is changed from RGB to GBR, and further during the period of phases 13 to 15 shown in Figure 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-mentioned Figure 5(a) or Figure 5(b) is applied after the order of the light sources is changed from RGB to BRG, thereby achieving the same effect as in Example 1.

[0037] Furthermore, in Example 4, for example, during the period of phases 2 to 4 shown in FIG. 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-described FIG. 5(a) or FIG. 5(b) is applied after changing the order of the light sources from RGB to GBR while maintaining the overall shape; further, during the period of phases 8 to 10 shown in FIG. 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-described FIG. 5(a) or FIG. 5(b) is applied after changing the order of the light sources from RGB to BRG while maintaining the overall shape; and further, during the period of phases 14 to 16 shown in FIG. 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-described FIG. 5(a) or FIG. 5(b) is applied while maintaining the overall shape and the order of the light sources, thereby achieving the same effect as Example 1.

[0038] In addition, in Example 4, for example, during the period of phases 3 to 5 shown in Figure 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-mentioned Figure 5(a) or Figure 5(b) is applied after changing the order of the light sources from RGB to BRG while maintaining the overall shape; further, during the period of phases 8 to 10 shown in Figure 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-mentioned Figure 5(a) or Figure 5(b) is applied while maintaining the overall shape and the order of the light sources; and further, during the period of phases 14 to 16 shown in Figure 3(c), a driving waveform similar to the driving waveform of the light source in Example 1 shown in the above-mentioned Figure 5(a) or Figure 5(b) is applied after changing the order of the light sources from RGB to GBR while maintaining the overall shape, thereby achieving the same effect as in Example 1.

[0039] In addition, in Example 4, the combinations of phases to which the same driving waveforms as those of the light source in Example 1 shown in Figure 5(a) or 5(b) above are applied are not limited to the above combinations, and other combinations may be selected as appropriate.

[0040] FIG. 4 is a diagram conceptually illustrating the relationship between the order of positive periods and the color of an image in an embodiment of the present invention. When multiple positive periods are provided consecutively, it is advantageous to provide the positive periods consecutively in the order shown in FIG. 4, for example. The order shown in FIG. 4 corresponds to the order of phases 1 to 5 shown in FIG. 3(c) above. That is, by providing positive periods consecutively in the order of "R," "G," and "B," as shown in (1), it is possible to display a single white image (W) with little color breakup in those three positive periods. Furthermore, by providing positive periods consecutively in the order of "G," "B," and "R," with "G" positioned second in the order of (1) as the first, as shown in (2), it is possible to display a single white image (W) with little color breakup in those three positive periods. Furthermore, as shown in (3), by placing "B," which is second in the order of (2), as the first, and providing consecutive positive periods in the order of "B," "R," and "G," it is possible to display a single white image (W) with minimal color breakup in these three positive periods. Therefore, the order (RGBRG) shown in Figure 4 can efficiently suppress the occurrence of color breakup.

[0041] In other words, the order shown in Fig. 4 is an order in which, when there is one sequence with four or more consecutive Positive periods, the combination of colors in three consecutive Positive periods included in that sequence becomes a combination of the three RGB colors at any position in that sequence. In addition to the order shown in Fig. 4, such an order also applies to, for example, the orders of phases 7 to 11 and phases 13 to 17 shown in Fig. 3(c) and the orders of phases 1 to 4, phases 6 to 9, and phases 11 to 14 shown in Fig. 3(b).

[0042] The present invention is not limited to the above embodiments and can be modified as appropriate within the scope of the present invention. For example, the number and order of field periods included in one frame period may be other combinations. The liquid crystal panel may be a liquid crystal panel using liquid crystal other than ferroelectric liquid crystal (e.g., nematic liquid crystal). The light source is not limited to LEDs and may be other light-emitting devices. The color of light emitted from the light source is not limited to red, blue, and green and may be other colors. [Explanation of symbols]

[0043] 1. Glass substrate 2 ITO film 3. Organic alignment film 4. Silicon substrate 5 pixel electrode 6 Organic alignment film 7 SiO thin film 8 LCD

Claims

1. An LCD panel, a light source that supplies light of a first color, a second color, and a third color to the liquid crystal panel; A liquid crystal display device that displays one color image in one frame period by field sequential driving, the one frame period is provided with a plurality of field periods which are consecutive and congruent with one another to display one color image, the field periods including at least a first field period for displaying a first image based on light of the first color, a second field period for displaying a second image based on light of the second color, and a third field period for displaying a third image based on light of the third color; a lighting start timing of the light source that is turned on in a field period that is first provided on a time axis among the plurality of field periods is controlled to be delayed by a predetermined time from the start timing of the field period, and a luminance of light emitted from the light source that is turned on in the field period is controlled to be a predetermined level that compensates for a decrease in the amount of light that occurs due to the lighting start timing of the light source being delayed by the predetermined time in the field period, a lighting end timing of the light source that is turned on in a field period that is last on a time axis among the plurality of field periods is controlled to be earlier than the end timing of the field period by a predetermined time, and a luminance of light emitted from the light source that is turned on in the field period is controlled to be a predetermined level that compensates for a decrease in the amount of light that occurs due to the lighting end timing of the light source being earlier by the predetermined time in the field period, a liquid crystal display device, characterized in that the brightness of light emitted from the light source turned on during a field period located between the first and last of the plurality of field periods on a time axis is controlled to be lower than the brightness of light emitted from the light source turned on during a field period located between the first and last of the plurality of field periods on a time axis.

2. the one frame period includes a fourth field period that is continuous with the first field period, the second field period, and the third field period and that displays a fourth image based on light of one of the first color, the second color, and the third color, and the order of the first field period, the second field period, the third field period, and the fourth field period is set so that a color combination of three consecutive field periods included in one sequence made up of at least the four field periods is a combination of the first color, the second color, and the third color at any position in the sequence; 2. The liquid crystal display device according to claim 1.

3. 3. The liquid crystal display device according to claim 2, wherein the one frame period includes a fifth field period that is consecutive to the first field period, the second field period, the third field period, and the fourth field period and that displays a fifth image based on light of one of the first color, the second color, and the third color, and the order of the first field period, the second field period, the third field period, the fourth field period, and the fifth field period is set so that a color combination of three consecutive field periods included in one sequence made up of at least five field periods is a combination of the first color, the second color, and the third color at any position in the sequence.

4. 4. The liquid crystal display device according to claim 1, wherein the first color is red, the second color is green, and the third color is blue.

Images