JP2003131191A - Field sequential color liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a field sequential color liquid crystal display device from occurring color smear due to that response speed slows down at low temperature and from lowering panel transmittance due to that reverse transition is apt to occur at low temperature to necessitate the increase of a black color insertion ratio when an OCB (optically compensated bend) mode liquid crystal is used. SOLUTION: A temperature measuring means 14 is provided on a liquid crystal panel and, when the temperature of the liquid crystal panel is lowered to, for example 20 deg.C or lower de to lowering of surrounding temperature in use, the liquid crystal panel is heated with a resistor heating means 13. In this case, a black matrix 11 formed on a counter substrate 2 is used as the resistive element. In the case the liquid crystal panel is heated for example to 40 deg.C or higher, the temperature is controlled to 40 deg.C or lower by turning off the power source of the resistor heater with a temperature controlling means 15 or by reducing the resistance. In this case, the heating is suitably carried out during a non-display time in which no image signal is written in by making a heating pulse waveform be generated in connection with timing of driving.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device used in a portable television, a portable information terminal, etc., and more particularly to a field sequential color liquid crystal display device suitable for displaying moving images.

[0002]

2. Description of the Related Art A liquid crystal display device of a color field sequential system is a system in which an image of three colors is sequentially displayed in one pixel without attaching a color filter to each pixel, which is higher than a liquid crystal of a conventional driving system. It has advantages such as high transmittance and high resolution. However, when there is a rapidly moving scene or when the human line of sight moves rapidly (saccade), the positional deviation of the residual colors of the R, G, and B signals on the retina is perceived as if it were colored. The problem of "color breakup" occurs. As measures against this color breakage, for example, Japanese Patent Laid-Open No.
Various systems have been proposed in which the drive system is devised as disclosed in Japanese Patent Publication No.-90916.

FIG. 6 shows on / off driving of a liquid crystal cell of a liquid crystal shutter optical system in a display panel disclosed in Japanese Patent Laid-Open No. 9-90916 and B (blue) G selected in one frame by this liquid crystal cell. It is a figure which shows the order of the image of each color of (green) R (red) W (white). In addition to the three primary colors of RGB, the display device is configured to display a color image by forming one frame by a frame sequential method using at least one field. In principle, one frame is composed of fields of intermediate colors of R, G, and B3 primary colors, but it is composed of four fields of white in addition to R, G, and B3 primary colors as required. Sometimes. In addition to the three RGB primary colors, these three intermediate colors (yellow, magenta, and cyan) are used.
The use of primary colors is also being considered.

With such a configuration, the display time of each field is shortened, and the portion to which the color signal of the previous field generated due to the time shift is added is displayed whitish. Further, the color signals B and R that are slightly added to the front and rear are very inconspicuous colors. Therefore, it is possible to display with almost no color breakup.

As another method, R within one frame
There is also proposed a method of eliminating color breakup by high speed driving such as 6 × speed driving for displaying color images in the order of GBRGB.

[0006]

However, in the case of the field sequential color type liquid crystal display device as described above, the following problems remain. That is, (1) the viscosity of the liquid crystal material increases as the temperature lowers, and the response speed becomes slower. Therefore, in a low temperature environment such as 0 ° C. or less, the timing of driving the video signal emits each color of RGB. Since the timing is not followed and the colors are not mixed properly, an image with color misregistration is displayed. On the other hand, if the temperature becomes too high, the reliability of the liquid crystal material cannot be ensured, which may cause display defects such as unevenness due to impurity ions in the liquid crystal.

(2) OCB as a high-speed response liquid crystal panel
When the mode is applied, a reverse transition state occurs in which the liquid crystal orientation changes from the bend state to the splay state. Therefore, the black voltage (that is, in the case of normally white display, a voltage of 5 to 6 V for black display is applied) is set to 1
It is necessary to insert black at a rate of some percentage of the frame (hereinafter, this insertion rate will be referred to as the black insertion rate).
In order to prevent the transition to the reverse transition state, it is necessary to increase the black insertion rate, but the aperture ratio over time becomes small, so the transmission rate will actually decrease. Therefore, the efficiency will decrease. Especially, when the temperature is low, the black insertion rate needs to be increased, so that the efficiency is further lowered when it is attempted to guarantee the use at the low temperature.

(3) In order to prevent color breakup, when W (white) insertion drive (RGBW drive) is performed, a liquid crystal panel having a faster response than W drive by RGB (normal drive) is required. Further, in order to drive at a high speed such as 6 times RGB RGB drive, a liquid crystal panel having a higher response is required.

[0009]

In order to solve the above problems, the field sequential color liquid crystal display device of the present invention has the following constitution.

That is, (1) a constitution is provided in which a heating / cooling means for controlling the temperature of the liquid crystal panel is provided.

(2) An OCB mode liquid crystal panel comprising two transparent substrates and a liquid crystal material having a refractive index anisotropy Δn of 0.18 or more sandwiched between the two transparent substrates, and a liquid crystal panel. The heating / cooling means for controlling the temperature is used.

(3) The alignment film formed on each of the two transparent substrates has a pretilt angle of 6 ° or more.

(4) The liquid crystal panel is constructed so that the response time of rising at a temperature at which it is used is 1 msec or less.

(5) The heating means is a backlight.

(6) The backlight is a direct type backlight in which a hot cathode tube is arranged directly below the liquid crystal panel.

(7) The heating means is a resistance heating means.

(8) The resistance heating means is a reflector provided under the backlight light guide plate.

(9) The resistance heating means is a black matrix provided on one side of the transparent substrate.

(10) The resistance heating means is provided on one side of the transparent substrate and is an electrode formed of a transparent conductor.

(11) A Peltier element is used as the heating / cooling means.

(12) The heating and cooling means performs pulse heating and cooling.

(13) The structure is such that the timing of performing the pulse heating / cooling by the heating / cooling means and the driving timing are linked.

(14) The heating / cooling means performs the pulse heating / cooling at a non-display time when no video signal is written in the liquid crystal panel.

(15) The configuration is such that the timing of performing pulse heating / cooling by the heating / cooling means and the backlight lighting timing at the time of writing the video signal are interlocked.

(16) The heating / cooling means performs the pulse heating / cooling at a non-lighting time other than the lighting of the backlight at the time of writing the video signal.

(17) The temperature measuring means and the temperature control circuit are provided.

(18) The temperature of the liquid crystal panel is 20 ° C. or higher 4
The structure was controlled so as to be 0 ° C. or lower.

(19) The heating and cooling means is composed of a buffer member.

(20) The rotational viscosity coefficient γ of the liquid crystal material is 50
The structure is set to mPas or less.

(21) The liquid crystal material of the liquid crystal panel has a dielectric anisotropy Δε of 7 or more and 12 or less.

(22) The cell gap of the liquid crystal panel is set to 3 μm.
The configuration is set to m or less.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) A first embodiment of the present invention will be described with reference to the drawings.

FIG. 1A is a plan view showing the structure of the liquid crystal display device according to the first embodiment of the present invention. Figure 1 (b)
FIG. 3 is a cross-sectional view showing the configuration of the liquid crystal display device according to the first embodiment of the present invention.

In FIG. 1, 1 is an array substrate, 2 is a counter substrate, 3 is a liquid crystal, 4 is a counter electrode, 5 is a pixel electrode, 6 is a video signal line connected to the pixel electrode 5 to give a video signal, and 7 is a scan. Signal line, 8 is a semiconductor switch element, 9 is a first insulating layer, 10 is a second insulating layer, 11 is a black matrix layer, 12a is an alignment film formed on the inner surface of the array substrate 1,
2b is an alignment film formed on the inner surface of the counter substrate 2, 13 is a resistance heating means, 14 is a temperature measuring means, 15 is a temperature control means,
Is.

The operation will be described below with reference to FIG.

First, a conductor made of Al, Ti or the like is formed on the array substrate 1, and the scanning signal lines 7 are patterned into a predetermined shape. After the first insulating layer 9 is formed on the first electrode group thus formed, the a-Si layer and the n + type a-Si layer (both shown in FIG. The semiconductor switch element 8 consisting of (not shown) is formed. Further, a conductor made of Al, Ti or the like is formed on a predetermined portion of the first insulating layer 9 and the semiconductor switching element 8, and a second electrode group made of the video signal line 6 is patterned into a predetermined shape.

Next, the second insulating layer 10 made of SiNx or the like is formed on the array substrate 1 on which the second electrode group is formed. The second insulating layer 10 also serves as a protective film that protects the semiconductor switching element 8.

Further, the pixel electrode 5 is made of a transparent conductor I.
It is formed of a TO film.

After that, alignment films 12a and 12b made of polyimide or the like are formed on the array substrate 1 and the counter substrate 2 in order to align the arrangement of the molecules of the liquid crystal 3.

In the OCB mode liquid crystal display element according to the present invention, the array substrate 1 and the counter substrate 2 are rubbed, but the directions are parallel to each other so that they are parallel.

The counter substrate 2 is provided so as to face the array substrate 1, the counter electrode 4 is formed, and the black matrix 12 is formed in a predetermined pattern.

The array substrate 1 and the counter substrate 2 thus manufactured each have an initial orientation in a predetermined direction, the peripheral portions thereof are bonded with a sealant, and then the liquid crystal 3 is injected and sealed.

The semiconductor switch element 8 is on / off controlled by a drive signal input from the video signal line 6 and the scanning signal line 7. Then, an electric field is generated by a voltage applied between the pixel electrode 5 connected to the semiconductor switch element 8 and the counter electrode 4, and the orientation of the liquid crystal 3 is changed to control the brightness of each pixel to display an image. indicate.

In the liquid crystal display device of the present invention, the liquid crystal molecules are in a splay alignment state in which they are aligned substantially parallel to each other when no voltage is applied in the initial stage, and the alignment of the liquid crystal is transferred to the bend alignment state used for display. In order to carry out this transition, a relatively large transition voltage, for example, about 25 V was applied to the liquid crystal layer.

Next, the operation and effect of the panel structure according to this embodiment will be described.

The OCB mode liquid crystal display device has a substrate and a liquid crystal, and displays by applying a voltage to the liquid crystal, and a zero voltage alignment state when no voltage is applied to the liquid crystal and a display alignment state used in the display state. Is a type of liquid crystal display device that makes a transition from a zero voltage alignment state to a display alignment state by applying a transition voltage.

Since the present embodiment is a field-sequential color liquid crystal display device, light-emitting diodes (not shown) of RGB colors are provided under the array substrate 1 as shown in FIG. 1B. There is. In this embodiment, a direct-type field sequential color liquid crystal display device in which light-emitting diodes of RGB colors are spread under the array substrate 1 will be described as an example. However, a prism plate is provided under the array substrate 1, A light emitting diode may be provided on the side of the prism plate.

Since the present embodiment is a field-sequential color liquid crystal display device, it is possible to display a color image without using a color filter by mixing RGB with time. As an example, in the field sequential color type liquid crystal display device, it is composed of 1/60 second.
The frame is divided into three subframes consisting of 1/180 second. R between each subframe,
The light emitting diodes of the colors G and B are sequentially turned on, but when displaying yellow, the transmittance of the liquid crystal is maximized in the subframes of R and G, and the transmittance of the liquid crystal is minimized in the subframe of B. There must be.

Therefore, if the timing of driving the video signal does not follow the timing of emitting each color of RGB, the colors are not properly mixed, and an image with a color shift is displayed. The reason why the driving timing does not follow is that the response of the liquid crystal is insufficient. Particularly in a low temperature environment, the viscosity of the liquid crystal becomes large, and this tendency becomes remarkable. In the above example, if the transmittance of the liquid crystal does not completely change from the maximum to the minimum during the 1/180 second from the lighting of the G light emitting diode to the lighting of the B light emitting diode, B The light from the light emitting diode will leak out, and the colors will not be mixed properly.

Further, in the OCB mode liquid crystal panel, there is a problem that a reverse transition state occurs in which the liquid crystal alignment changes from a bend state for displaying an image normally to a splay state. Therefore, it is necessary to insert black voltage (that is, in the case of normally white display, apply a voltage of 5 to 6 V for black display) at a rate of some percentage in one frame (black insertion). Hereinafter, this insertion rate will be referred to as a black insertion rate). This black insertion rate must be increased to prevent the reverse transition state.
Since the aperture ratio over time becomes small, the transmittance will decrease substantially, and the efficiency will decrease. Especially, when the temperature is low, the black insertion rate needs to be increased, so that the efficiency is further lowered when it is attempted to guarantee the use at the low temperature.

Therefore, in the present invention, the temperature measuring means 14 is provided in the liquid crystal panel, and the resistance heating means 13 is used when the temperature of the use environment falls and the temperature of the liquid crystal panel falls below 20 ° C., for example.
The liquid crystal panel is heated by. Here, the black matrix 11 formed on the counter substrate 2 was used as the resistor. Besides, the resistor may be a resistor patterned on the counter substrate with ITO, or a resistor formed outside the liquid crystal panel, such as a reflector of a backlight.

On the other hand, long use of the liquid crystal panel in a high temperature environment causes defects such as uneven brightness and uneven color. Therefore, the liquid crystal panel is, for example, 40
When the temperature is heated to ℃ or more, the temperature of the resistance heating is turned off by the temperature control means 15, or the resistance is controlled to 40 ℃ or less by reducing the resistance. Also, in order to facilitate temperature control, it is desirable to use pulse heating instead of constantly heating.

2A and 2B show driving timings and heating timings of the liquid crystal display device according to the first embodiment of the present invention. FIG. 2A is a driving timing chart and FIG. 2B is a timing chart. The timing chart of heating is shown.

The heating pulse waveform at this time can be configured with a simple circuit by interlocking with the driving timing. For example, if it is not desired to apply an unnecessary load to the drive circuit, heating may be performed during the non-display time when no video signal is written, as shown in FIG.

Here, the timing of driving the video signal follows the timing of emitting each color of RGB,
In order for the color mixture to occur normally, the response speed of the rising of the liquid crystal is preferably 1 msec or less.
This value is RGB in 16.7 msec per frame.
It is a value obtained by subtracting and recalculating each video signal writing and black writing for preventing reverse transition.

Therefore, considering the retardation Δnd from the viewpoint of high-speed response, the refractive index anisotropy Δ of the liquid crystal 3 is
It is desirable that n is 0.18 or more, the rotational viscosity coefficient is 50 mPas or less, and the cell gap is 3 μm or less. Further, in consideration of reliability, it is desirable that the dielectric anisotropy Δε of the liquid crystal 3 is 7 or more and 12 or less.

Since the response speed of the liquid crystal panel is controlled to be equal to or less than a certain value by the above-mentioned configuration, the colors are normally mixed even in a low temperature environment, and an image with a color shift is not displayed. Further, in the OCB liquid crystal mode, it is possible to prevent the reverse transition from the bend alignment to the splay alignment without increasing the black insertion ratio even at a low temperature, and the panel transmittance is lowered at a low temperature and the efficiency is not lowered.

(Embodiment 2) A second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a sectional view showing the structure of a liquid crystal display device according to the second embodiment of the present invention.

This embodiment is different from (Embodiment 1) in that the backlight 16 is used as a heating means. The use of a hot cathode tube for the light source 16a of the backlight 16 is more effective for heating. Further, in order to uniformly heat the entire panel, a so-called direct type backlight in which a hot cathode tube is arranged directly below is desirable.

FIG. 4 shows driving timing, backlight lighting timing and heating timing of the liquid crystal display device according to the second embodiment of the present invention.
4A shows a driving timing chart, FIG. 4B shows a backlight lighting timing chart, and FIG. 4C shows a heating timing chart.

The heating pulse waveform at this time is shown in FIG.
As in (c), heating may be performed during the non-display time when the video signal is not written. That is, heating is performed by writing the R video signal and turning on the B backlight until the next G video signal is written.

In addition to this, it is also conceivable to use a reflecting plate made of metal used in the reflection type liquid crystal display device as the heating means.

(Embodiment 3) A third embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a sectional view showing the structure of a liquid crystal display device according to the third embodiment of the present invention.

This embodiment is an embodiment in which the cooling means 17 is externally attached to the liquid crystal panel, and particularly when it is continuously exposed to a high temperature environment or when it is suddenly exposed to a high temperature environment. Is effective in.

As the cooling means 17, for example, a Peltier element is used. With the temperature measuring means 14 provided on the liquid crystal panel, 4
When the temperature rises above 0 ° C., the cooling means 17 cools the liquid crystal panel. By cooling at a high temperature in this way, the response speed of the liquid crystal panel is controlled to be equal to or less than a certain level, and therefore it is possible to effectively suppress the occurrence of display defects such as display unevenness due to impurity ions in the liquid crystal.

In this embodiment, since the Peltier element is used as the cooling means 17, the cooling can be forcedly and rapidly performed. Further, when the response speed at room temperature is slightly slow (when the rising response exceeds 1 msec) and the panel temperature needs to be set slightly higher, the temperature range to be controlled is narrow, for example, 30 ° C to 40 ° C. This configuration is also effective in cases such as cases.

Further, if a cushioning member is used for the external cooling means 17, it is possible to reduce the impact from the outside, which is a particularly effective structure when used in mobile equipment.

(Others) Heating means 13 and 16 as in the first and second embodiments and cooling means 1 as in the third embodiment.
You may use the heating and cooling means which combined with 7. In this case, since the response speed of the liquid crystal panel is controlled within a constant temperature range, the colors are normally mixed even in a low temperature environment, and an image with a color shift is not displayed. Further, in the OCB liquid crystal mode, it is possible to prevent the reverse transition from the bend alignment to the splay alignment without increasing the black insertion ratio even at a low temperature, and the panel transmittance is lowered at a low temperature and the efficiency is not lowered. Further, it is possible to effectively suppress the occurrence of display defects such as display unevenness due to impurity ions in the liquid crystal, which may occur when the liquid crystal panel becomes hot.

[0072]

As described above, the liquid crystal display device according to the present invention can achieve the following operational effects. That is, if a heating means is used, even in a low temperature environment,
Since the response speed of the liquid crystal panel is controlled above a certain level, color mixing is normally performed in the field sequential system,
An image with a color shift is not displayed. further,
When the OCB liquid crystal is used, it is possible to prevent the reverse transition from the bend alignment to the splay alignment without increasing the black insertion ratio even at a low temperature, and the panel transmittance is lowered at a low temperature without lowering the efficiency.

If the cooling means is used, the response speed of the liquid crystal panel is controlled to be constant or less even in a high temperature environment, so that it is effective to prevent display defects such as display unevenness due to impurity ions in the liquid crystal. Can be suppressed to.

If a heating / cooling means in which a cooling means and a heating means are combined is used, the response speed of the liquid crystal panel is controlled to a temperature within a certain range under both low temperature and high temperature environments. Even under the environment, the colors are normally mixed and the image with the color shift is not displayed. Further, since it is not exposed to a high temperature environment above a certain level, high reliability can be maintained.

From the above, suitable for displaying moving images at high speed,
In addition, since it is possible to provide a highly reliable field sequential color liquid crystal display device, its industrial value is extremely large.

[Brief description of drawings]

FIG. 1A is a plan view showing a configuration of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 1B is a sectional view showing a configuration of a liquid crystal display device according to the first embodiment of the present invention.

FIG. 2 is a drive timing chart and a heating timing chart of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a configuration of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 4 is a driving timing chart, a backlight lighting timing chart, and a heating timing chart of the liquid crystal display device according to the second embodiment of the present invention.

FIG. 5 is a sectional view showing a configuration of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 6 is an on / off drive of a liquid crystal cell of a liquid crystal shutter optical system in a conventional display panel, and B (blue) G (green) R (red) W selected in one frame by this liquid crystal cell.
(White) Diagram showing the order of images of each color

[Explanation of symbols]

1 Array substrate 2 Counter substrate 3 Liquid crystal layer 4 Counter electrode 5 pixel electrodes 6 video signal lines 7 scanning signal lines 8 Semiconductor switch element 9 First insulating layer 10 Second insulating layer 11 Black Matrix 12 Alignment film 13 Resistance heating means 14 Temperature measuring means 15 Temperature control means 16 backlight 17 Cooling means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G09G 3/20 621 G09G 3/20 621A 5C094 642 642A 5G435 3/34 3/34 J 3/36 3/36 H04N 5/66 102 H04N 5/66 102A F Term (reference) 2H089 HA19 HA40 KA11 KA17 QA05 QA06 QA11 QA12 QA13 2H093 NA65 NC02 NC43 NC46 NC47 NC49 NC57 NC65 NC76 ND17 ND32 ND32 ND45 NF04 NH11 5CBB FA16EA02BB62 FA16EA02BB62 FA16EA02BB29 FA16EA22BB6229 GA03 5C058 AA09 AB03 BA06 BA29 BA30 BB03 5C080 AA10 BB05 DD05 DD30 FF11 JJ04 JJ06 KK07 KK43 5C094 AA03 AA08 AA13 AA34 AA53 BA43 DB10 EA05 EE10 BB15A12 EA10 BB10A04 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A15 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A12 A15 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A01 A10 A01 A01

Claims (22)

[Claims] 1. A field sequential color liquid crystal display device comprising a liquid crystal panel and a heating / cooling means for controlling the temperature of the liquid crystal panel. 2. An OCB mode liquid crystal panel comprising two transparent substrates and a liquid crystal material having a refractive index anisotropy Δn of 0.18 or more sandwiched between the two transparent substrates, and the liquid crystal panel. A field sequential color liquid crystal display device comprising a heating / cooling means for controlling the temperature of the liquid crystal display device. 3. The field sequential color liquid crystal display device according to claim 2, wherein the alignment film formed on each of the two transparent substrates is an alignment film having a pretilt angle of 6 ° or more. 4. The field sequential color liquid crystal display device according to claim 1, wherein a response time of rising at a temperature at which the liquid crystal panel is used is set to 1 msec or less. 5. The field sequential color liquid crystal display device according to claim 1, wherein the heating means is a backlight. 6. The field sequential color liquid crystal display device according to claim 5, wherein the backlight is a direct type backlight in which a hot cathode tube is arranged directly below the liquid crystal panel. 7. The field sequential color liquid crystal display device according to claim 1, wherein the heating unit is a resistance heating unit. 8. The field sequential color liquid crystal display device according to claim 7, wherein the resistance heating means is a reflecting plate provided below the backlight light guide plate. 9. The field sequential color liquid crystal display device according to claim 7, wherein the resistance heating means is a black matrix provided on one side of the transparent substrate. 10. The field sequential color liquid crystal display device according to claim 7, wherein the resistance heating means is an electrode formed on one side of the transparent substrate and formed of a transparent conductor. 11. The field sequential color liquid crystal display device according to claim 1, wherein a Peltier element is used for the heating and cooling means. 12. The field sequential color liquid crystal display device according to claim 1, wherein the heating / cooling means performs pulse heating / cooling. 13. The field sequential color liquid crystal display device according to claim 12, wherein the timing of performing pulse heating / cooling by the heating / cooling means and the driving timing are linked. 14. The timing for applying pulse heating / cooling by the heating / cooling means is a non-display time during which a video signal is not written to the liquid crystal panel.
Field sequential color liquid crystal display device described. 15. The timing for applying pulse heating / cooling by the heating / cooling means and the backlight lighting timing for writing a video signal are interlocked.
3. The field sequential color liquid crystal display device described in 3. 16. The pulse heating / cooling timing of the heating / cooling means is a non-lighting time other than lighting of the backlight when writing a video signal.
Field sequential color liquid crystal display device described. 17. The field sequential color liquid crystal display device according to claim 1, further comprising a temperature measuring means and a temperature control circuit. 18. The temperature of the liquid crystal panel is 20 ° C. or higher and 40 ° C.
18. The field sequential color liquid crystal display device according to claim 17, which is controlled as follows. 19. The field sequential color display device according to claim 1, wherein the heating / cooling means comprises a buffer member. 20. The rotational viscosity coefficient γ of the liquid crystal material is 50.
It is below mPas, It is characterized by the above-mentioned.
A field sequential color liquid crystal display device according to any one of 1. 21. The field sequential color liquid crystal display device according to claim 1, wherein the liquid crystal material of the liquid crystal panel has a dielectric constant anisotropy Δε of 7 or more and 12 or less. 22. The cell gap of the liquid crystal panel is 3 μm.
The field sequential color liquid crystal display device according to any one of claims 1 to 4, wherein the liquid crystal display device has a thickness of m or less.