JP3368638B2 - Light source device and color liquid crystal display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device used as a backlight of a display unit in, for example, a liquid crystal television device or a personal computer, and a color liquid crystal display device using the light source device.

[0002]

2. Description of the Related Art In recent years, color liquid crystal panel devices have come into widespread use in liquid crystal televisions, personal computers and the like. This color liquid crystal panel is generally integrated with a transmissive liquid crystal display panel as a center, a backlight light source emitting white light on one side, and a color filter having R, G, B filters arranged on the other side. Is composed of. Here, in the color filter, filters of respective primary colors of R, G, and B are regularly arranged in correspondence with respective dots of a dot matrix of a liquid crystal display panel, and one of the three primary colors (3 dots) of a display image is displayed. It is supposed to correspond to pixels. A black mask shields the space between the dots of the color filter, which contributes to the improvement of contrast.

[0003]

However, in the color liquid crystal panel device as described above, since the spaces between the dots of the color filter are masked, the light transmittance is extremely low, the screen becomes dark, and 3 dots are formed. However, there is a structural problem that the resolution is reduced because one pixel is expressed by.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a light source device capable of obtaining a bright and high-resolution screen and a color liquid crystal using the light source device. It is to provide a display device.

[0005]

According to the present invention, the inside of the tube is divided into at least three parts, and the divided inner wall surfaces are each coated with a luminescent agent of a primary color. A pair of electron emission electrodes arranged at substantially equal distances from the opening, and arranged in the vicinity of this electron emission electrode,
AC drive of a pair of electron emission electrodes of the fluorescent tube by using a fluorescent tube having a control electrode for generating an electric field to deflect electrons emitted from the electron emission electrode and selectively passing through the divided light emitting chambers. Then, one of the light emitting chambers is caused to emit light, and the control electrode is driven to deflect the electrons emitted from the electron emitting electrode to control the light emitting position of the light emitting chamber in a time-division manner. is there.

[0006]

According to the above structure, the liquid crystal panel is arranged through the fluorescent tube and the diffusing plate with a color image corresponding to the color emitted by the fluorescent tube in synchronization with the time division control. By performing time-division display driving, a color image can be displayed with one dot of the liquid crystal display panel as one pixel without requiring a color filter or the like, and thus a bright and high-resolution screen can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a color liquid crystal television device will be described below with reference to the drawings. FIG. 1 shows the entire basic circuit configuration. Television waves received by an antenna 11 are supplied to a tuner 12. The tuner 12 selects a designated channel according to the tuning signal from the tuning control circuit 13 and converts it into an intermediate frequency signal. Then, the intermediate frequency signal output from the tuner 12 is sent to the TV linear circuit 14.

The TV linear circuit 14 is composed of an intermediate frequency amplification circuit, a video detection circuit, a video amplification circuit, an AFT detection circuit, and the like. The intermediate frequency signal from the tuner 12 is amplified by the intermediate frequency amplification circuit and the video The detection circuit detects the image. Then, an audio signal is extracted from the output signal of the video detection circuit and sent to the audio circuit 15.

The audio circuit 15 is composed of an audio detection circuit and an audio amplification circuit. The signal from the TV linear circuit 14 is audio-detected and converted into a low-frequency signal, and then audio-amplified to drive the speaker 16 loudly. To do.

The output signal of the video detection circuit in the TV linear circuit 14 is amplified by the video amplification circuit and then sent to the chroma circuit 17 and the sync separation circuit 18. The sync separation circuit 18 separates the horizontal and vertical sync signals contained in the video signal, and controls the composite sync signal C-SYNC to the tuning control circuit 13 and the horizontal sync signal H-SYNC and the vertical sync signal V-SYNC. It outputs to each circuit 19.

The TV linear circuit 14 also performs AFT detection of the output signal of the intermediate frequency amplification circuit by an AFT detection circuit to extract an AFT signal whose voltage value changes in an S-shape and sends it to the tuning control circuit 13.

The tuning control circuit 13 is supplied with key inputs such as tuning setting data and tuning up / down instructions from the key input section 20. The tuning control circuit 13 creates a tuning signal having a voltage value corresponding to a designated channel based on the operation of the tuning up / down key in the key input unit 20 and the AFT signal from the TV linear circuit 14, and the tuner mentioned above.
Output to 12.

The timing control circuit 19 outputs the timing pulse 3 based on the horizontal sync signal H-SYNC and the vertical sync signal V-SYNC sent from the sync separation circuit 18.
φs is created and output to the time division control circuit 21.

The chroma circuit 17 subjects the video signal supplied from the TV linear circuit 14 to chroma processing to perform R, G, B
And outputs it to the time-division control circuit 21. This time division control circuit 21 is, as shown in FIG.
31-33 R memory 3 consisting of 1 field memory 3
4, which has a G memory 35 and a B memory 36, and the primary color signals from the chroma circuit 17 are A / D converters 31 to 31 respectively.
At 33, sampling is performed in synchronism with the timing pulse 3φs, converted into digital video data of 3 to 4 bits per pixel, and the R memory 34, G memory 35 and B memory
Remember to 36. Thus, the R memory 34 and the G memory 35
The digital video data for each primary color stored in the B memory 36 is output to the segment drive circuit 22 in time division in synchronization with the timing pulse 3φs.

Further, the timing control circuit 19 is a TV
Horizontal sync signal H-SYNC given from the linear circuit 14
And a timing signal for display control is created based on the vertical synchronizing signal V-SYNC, and the operation of the segment drive circuit 22 and the common drive circuit 23 is controlled.

The common drive circuit 23 generates a scanning signal in accordance with the timing signal from the timing control circuit 19 and sequentially drives the common electrodes of the LCD panel 24 for monochrome display. The segment drive circuit 22 is a time division control circuit 21.
The video data of 3 to 4 bits given from is sequentially read by the timing signal from the timing control circuit 19 and 1
After the video data for the line is read, a gradation signal is created according to the video data, and the segment electrodes of the LCD panel 24 are driven for display.

Further, the timing control circuit 19 outputs to the light source drive circuit 25 a display discrimination signal synchronized with the time division timing in the time division control circuit 21. The light source drive circuit 25 is an LCD
A flat fluorescent tube, which will be described later, which serves as a light source of the backlight of the panel 24 is driven to emit light, and the light emitting position in the fluorescent tube is controlled according to a display determination signal from the timing control circuit 19,
R, G, and B single colors are driven by time-division emission. FIG. 3 exemplifies the configuration of a circuit for controlling the light emitting position in the light source drive circuit 25, particularly in the fluorescent tube, and the display discrimination signal is input to the switching circuit 37. This switching circuit 37 corresponds to the display discrimination signal and is given in advance with voltages + Va, + Vb, -V.
a and -Vb are selectively applied as control voltages to the control electrode of the fluorescent tube.

Next, a specific structure of the flat fluorescent tube will be described. FIG. 4 is a perspective view showing the entire structure. The tube main body 41 is constructed by integrally forming a central flat plate-shaped light emitting chamber portion 42 and a pair of electrode portions 43a and 43b located on one opposite side of the light emitting chamber portion 42. For example, mercury vapor and argon gas are enclosed in the tube.

The light emitting chamber portion 42 is formed by providing separators 44a and 44b so that the three light emitting chambers 42a to 42c are arranged in parallel in a direction orthogonal to the direction connecting the electrode portions 43a and 43b.
FIG. 5 shows the arrangement of the light emitting chambers 42a to 42c along the line VV in FIG. 4, and as shown in FIG.
On the inner wall surfaces of the three light emitting chambers 42a to 42c divided by a and 44b, the R, G, and B light emitting agents 45a for converting the far ultraviolet rays generated by the discharge in the tube into the primary color visible light respectively.
45c is applied.

Further, in the electrode portions 43a and 43b, a pair of electron emission electrodes 46a and 46b arranged at substantially equal distances from the openings of the light emitting chambers 42a to 42c, and the pair of electron emission electrodes 46a. , 46b so as to be sandwiched therebetween, and a pair of control electrodes 47a1, 47a2 for deflecting the electrons emitted from the electron emission electrodes 46a, 46b to selectively pass through the divided light emitting chambers 42a-42c. 47b1 and 47b2
Is provided.

A capacitor 48 and an AC power source 49 are connected in series between the electron emitting electrodes 46a and 46b, and the AC power source 49 applies an AC voltage to the electron emitting electrodes 46a and 46b so that the light emitting chamber can be operated. One of 42a to 42c is surface-emitted.

Between the control electrodes 47a1 and 47a2 and 47b
An AC power supply 50 is connected between 1 and 47b2. The AC power source 49 and the AC power source 50 constitute the light source drive circuit 25 of FIG. 1, and the AC voltage output from the AC power source 50 drives the control electrodes 47a1 and 47a2 and 47b1 and 47b2 to drive the electronic signals. Time division control is performed in which electrons emitted from the emission electrodes 46a and 46b are deflected to selectively emit light in the three light emitting chambers 42a to 42c in a time division manner.

FIG. 6 shows the control electrodes 47a1 and 47a2 (47b).
1, 47b2) for explaining the operating principle of the electron deflection state, in which the electron e is emitted from the electron emission electrode 46a side, and the AC power source 50 is minus on the control electrode 47a1 side. The positive state on the side of 47a2 is indicated by the DC power supply symbol for the AC power supply 50.
In this case, since the side of the control electrode 47a2 is positive, the electrons e emitted from the electron emission electrode 46a are
In the electric field between 47a1 and 47a2, it is deflected to the control electrode 47a2 side, and as a result, passes through the light emitting chamber 42c and reaches the electron emission electrode 46b not shown here. Therefore, the light emitting agent 45c of B applied to the inner wall surface of the light emitting chamber 42c causes the light emitting chamber 42c to emit blue surface light at this time.

In the above structure, the electron emission electrode
Since a constant AC drive voltage is constantly applied to the 46a and 46b by the AC power source 49, one of the light emitting chambers 42a to 42c always emits surface light.

Here, the R memory in the time division control circuit 21
While the image data for R (red) for one image stored in 34 is sequentially read out to the segment drive circuit 22 and displayed on the LCD panel 24, in synchronization with this, the light source drive circuit 25 uses the AC power supply 50 to synchronize the data. For example, a voltage of -a [V] is selected and applied as a control voltage to the control electrodes 47a1, 47a2, 47b1 and 47b2, and the control electrodes 47a1 and 47b1 are positive and the control electrode 47 is a positive electrode.
Make the a2 and 47a2 sides negative. Therefore,
Electrons e emitted from the electron emission electrode 46a (46b) have a polarity opposite to that of the state shown in FIG. 6 and are emitted from the control electrode.
In the electric field between 47a1 and 47a2 (47b1 and 47b2), the light is deflected to the control electrode 47a1 (47b1) side, passes through the light emitting chamber 42a, and reaches the electron emission electrode 46b (46a). Therefore, the R luminescent agent 45c applied to the inner wall surface of the light emitting chamber 42a causes the light emitting chamber 42a to emit red surface light at this time. As a result, although the LCD panel 24 itself has a monochrome structure, a red image is displayed by the tube body 41 as a backlight emitting red light through the diffusion plate.

Further, the R memory 34 in the time division control circuit 21.
The reading of the image data for R (red) from is completed, then the image for G (green) is read from the G memory 35 and sequentially read to the segment drive circuit 22 and displayed on the LCD panel 24. In the light source driving circuit 25, a voltage of, for example, 0 [V] is selected by the AC power source 50 in synchronization with this, and is applied to the control electrodes 47a1, 47a2, 47b1, 47b2 as a control voltage, between the control electrodes 47a1, 47a2 and 47b1. , 47a2 are controlled so that the potential difference between them is 0. Therefore,
The electrons e emitted from the electron emitting electrode 46a (46b) are not deflected at all, pass through the light emitting chamber 42b located at the shortest distance thereof, and reach the electron emitting electrode 46b (46a). Therefore, the luminous chamber
The G luminous agent 45b applied to the inner wall surface of 42b causes the luminous chamber 42b to emit green light at this time. As a result, the tube main body 41 as a backlight emits green light through the diffusion plate, so that a green image is displayed on the LCD panel 24.

Similarly, the reading of the G (green) image data from the G memory 35 in the time division control circuit 21 is completed, and then the B (blue) image is read from the B memory 36. Are sequentially read out to the segment drive circuit 22 and displayed on the LCD panel 24 in synchronization with the light source drive circuit 25.
Then, a voltage of, for example, + a [V] is selected by the AC power source 50, and the control electrodes 47a1, 47a2, 47b1, 47 are used as control voltages.
b2, the control electrodes 47a1 and 47b1 are negative,
The control electrodes 47a2 and 47a2 are controlled to be positive. Therefore, as shown in FIG.
Electrons e emitted from a (46b) are controlled electrodes 47a1 and 47a.
control electrode 47a2 in the electric field between a2 (47b1, 47b2)
It is deflected to the side of (47b2), passes through the light emitting chamber 42c, and reaches the electron emission electrode 46b (46a). Therefore, the light emitting agent 45c of B applied to the inner wall surface of the light emitting chamber 42c causes the light emitting chamber 42c to emit blue surface light at this time. As a result, the tube main body 41 as a backlight emits blue light through the diffusion plate, so that a blue image is displayed on the LCD panel 24.

FIG. 7 shows the light source drive circuit 25 as described above.
The waveform of the control voltage output from (AC power supply 50) and the emission color corresponding thereto are shown. Actually, at the time of switching with the control voltage, especially at the time of shifting from B (blue) color emission in the light emitting chamber 42c to R (red) color emission in the light emitting chamber 42a,
In order not to emit G (green) color light in the light emitting chamber 42b,
The display pause time is created by controlling the shutter operation on the LCD panel 24 or the AC power source 49 which is a power source for light emission.

If such an operation cannot be performed, a control voltage ± b [V] having a peak value higher than the control voltage ± a [V] is used, and a control voltage having a waveform as shown in FIG. 8 is used. The light source drive circuit 25 (AC power supply 50) may be used for output. In this case, the control voltage ± b, which has a peak value sufficiently higher than ± a [V] at the timing when light emission is desired to be stopped
By giving [V], the electron emission electrode 46a (46b)
The electrons e emitted from the control electrodes 47a1, 47a2, 47b
1, 47b2 have been completely attracted, and the light emitting chambers 42a to 42c
It does not allow any of the above to pass.

As described above, a color image for one screen is displayed by dividing the image data for each of R, G, and B into three times in a time-sharing manner, so that one display dot of the LCD panel 24 is directly set as one pixel. Color display can be realized while using.

Further, in FIG. 4, the electron emission electrodes 46a, 46a
The electrons e emitted from b are controlled by the control electrodes 47a1, 47a2, 47
Although the structure in which the light is deflected by b1 and 47b2 is exemplified, instead of these control electrodes 47a1, 47a2, 47b1 and 47b2,
A pair of spiral control electrodes 51a and 52b as shown in FIG.
May be provided. In this case, the basic configuration is the same as that shown in FIG. 4, so the same reference numerals are given to the same portions and the description thereof will be omitted.
Electron emission electrodes 46a and 46b are generated by the magnetic fields generated by a and 52b.
The electrons e emitted from the device are deflected in a circular orbit as shown in FIG. 11, and the passage is controlled to one of the light emitting chambers 42a to 42c (here, the light emitting chamber 42a).

Further, the control electrodes 47a1, 47a2,
Instead of 47b1 and 47b2 or the control electrodes 51a and 52b of FIG. 9, control electrodes 52a to 52c as shown in FIG. 6 may be provided. In this case as well, the basic configuration is the same as that shown in FIG. 4, so the same reference numerals are given to the same parts and the description thereof will be omitted, but the control electrodes 52a to 52c are the light emitting chambers 42a to 42c. It is embedded in the inner wall of the opening on the electrode part 43a side. Therefore, to these control electrodes 52a to 52c, the AC voltage generated by the AC power supply 49 applied to the electron emission electrode 46b side is selectively supplied via the switching circuit 53 controlled by the AC voltage generated by the AC power supply 50. The electrons e emitted from the electron emission electrode 46a by the magnetic field emitted by the selected control electrodes 52a to 52c are linearly applied to any of the light emission chambers 42a to 42c (see FIG. 12). Here, the light emission chamber 42a) is controlled to pass through.

Further, in each of the above embodiments, the light source of the backlight is described by using the flat fluorescent tube, but it may be considered that the light source of the backlight is constituted by a generally tubular straight fluorescent tube. FIG. 13 shows a simplified structure of the straight tube-shaped fluorescent tube 61. The fluorescent tube 61 is formed with separators 63a and 63b so as to form three light emitting chambers 62a to 62c along the axial direction. The tube is divided and, for example, mercury vapor and argon gas are sealed in the tube. The inner wall surfaces of the light emitting chambers 62a to 62c are coated with R, G, and B light emitting agents that convert the far ultraviolet rays generated by the discharge in the tube into visible light of primary colors.

When the fluorescent tube 61 having such a structure is used as the light source of the backlight, the light emission by each of the primary colors of R, G and B is a linear one having a width of about 1/3 of the diameter of the tube. Therefore, in order to irradiate this on the entire surface of the LCD panel 24, for example, as shown in FIG.
It is conceivable to use a reflector 64 having a V-shaped cross section in which is arranged. In this case, a diffuser plate is placed in front of the reflector plate 64.
By disposing 65, it is possible to make the light emission more flat and uniform.

It is also conceivable to construct a sidelight type light source device, which is one type of backlight, using the fluorescent tube 61. FIG. 15 exemplifies such a structure, FIG. 15 (A) is a diagram showing a partial cross-sectional structure, and FIG. 15 (B) is a diagram showing an overall laminated structure. As shown in FIGS. 7A and 7B, the diffusion sheet 71, the transparent light guide plate
The fluorescent tube 61 held by the pair of holders 74a and 74b is disposed in the case 75 so that the 72 and the reflection sheet 73 are laminated and integrated so as to abut one side surface thereof. At this time, a reflection sheet 76 is arranged along the axial direction of the fluorescent tube 61 on the inner surface of the case 75 opposite to the transparent light guide plate 72 with the fluorescent tube 61 interposed therebetween. The transparent light guide plate 72 is configured such that the reflectance increases as the distance from the side of the fluorescent tube 61 increases, and with such a structure, the R, G, and B sequentially emitted by the fluorescent tube 61 are emitted. The primary color light is reflected by the reflection sheet 73 while passing through the transparent light guide plate 72, and passes through the diffusion sheet 71, so that the light emission becomes more flat and uniform, and the LCD (not shown) is shown.
The panel 24 is illuminated from the rear side.

By adopting such a side-light type construction, while using the straight fluorescent tube 61,
Compared with the one using the reflector 64 having a V-shaped cross section shown in FIG. 4, it can be made much thinner, and can greatly contribute to the miniaturization of a device such as a color liquid crystal television device using this backlight. .

[0037]

As described above in detail, according to the present invention, since a color image can be displayed with one dot of a liquid crystal display panel as one pixel without requiring a color filter or the like, it is bright and has high resolution. A light source device capable of obtaining a screen and a color liquid crystal display device using the light source device can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a color liquid crystal television device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the internal configuration of the time division control circuit of FIG.

FIG. 3 is a block diagram showing a configuration inside a light source drive circuit of FIG.

FIG. 4 is a diagram illustrating the structure of a flat fluorescent tube that serves as a backlight light source according to the embodiment.

5 is a view showing a cross-sectional structure taken along line VV of FIG.

FIG. 6 is a diagram illustrating a time-division emission state of the flat fluorescent tube of FIG.

FIG. 7 is a diagram illustrating a control voltage waveform to a control electrode of the flat fluorescent tube according to the embodiment.

FIG. 8 is a diagram illustrating a control voltage waveform to a control electrode of the flat fluorescent tube according to the embodiment.

FIG. 9 is a view exemplifying another structure of the flat fluorescent tube serving as the backlight light source according to the embodiment.

FIG. 10 is a view exemplifying another structure of the flat fluorescent tube serving as the backlight light source according to the embodiment.

FIG. 11 is a view exemplifying a time division light emitting state of the flat fluorescent tube of FIG. 9;

12 is a view exemplifying a time division light emitting state of the flat fluorescent tube of FIG.

FIG. 13 is a diagram illustrating the structure of a straight fluorescent tube that serves as a backlight light source according to the embodiment.

14 is a diagram showing an example of the structure of a backlight using the straight tubular fluorescent tube of FIG.

FIG. 15 is a diagram showing another structural example of a backlight using the straight tubular fluorescent tube of FIG.

[Explanation of symbols]

11 ... Antenna, 12 ... Tuner, 13 ... Tuning control circuit, 14 ... TV linear circuit, 15 ... Audio circuit, 16 ... Speaker, 17 ... Chroma circuit, 18 ... Sync separation circuit, 19 ... Timing control circuit, 20 ... Key input Part, 21 ... time division control circuit, 22
… Segment drive circuit, 23… Common drive circuit, 24… LC
D panel, 25 ... Light source drive circuit, 31 to 33 ... A / D converter,
34 ... R memory, 35 ... G memory, 36 ... B memory, 37
... Switching circuit, 41 ... Tube body, 42a-42c, 62a-62c ... Light emitting chamber, 43a, 43b ... Electrode part, 44a, 44b, 63a, 63b ...
... Separator, 45a to 45c ... Luminescent agent, 46a, 46b ... Electron emission electrode, 47a1, 47a2, 47b1, 47b2, 51a, 52
b, 52a to 52c ... Control electrode, 49 ... AC power supply (for light emission),
50 ... AC power supply (for control), 53 ... Switching circuit, 61 ...
Straight tubular fluorescent tubes, 64 ... Reflecting plate, 65 ... Diffusing plate, 71 ... Diffusing sheet, 72 ... Transparent light guide plate, 73 ... Reflecting sheet, 74a, 74b ... Holder, 75 ... Case.

Claims (6)

(57) [Claims] 1. A light emitting chamber formed by dividing the inside of the tube into at least three and applying a light emitting agent of a primary color to each of the divided inner wall surfaces, at substantially equal distances from the openings of the light emitting chambers. A pair of electron emission electrodes arranged and arranged in the vicinity of the electron emission electrode to generate an electric field to deflect the electrons emitted from the electron emission electrode and selectively pass through the divided light emitting chambers. A fluorescent tube having a control electrode, a light emission drive means for alternating-currently driving a pair of electron emission electrodes of the fluorescent tube to cause one of the light emission chambers to emit light, and the control electrode is driven to emit light from the electron emission electrode. A light source device for deflecting electrons to control the light emitting position of the light emitting chamber in a time division manner. 2. The light source device according to claim 1, wherein the control electrode comprises an electrode plate arranged so as to sandwich electrons emitted from the electron emission electrode. 3. The light source device according to claim 1, wherein the control electrode comprises a spiral electrode. 4. The control electrode is formed by being embedded in the inner wall of each of the light emitting chamber openings on the side closer to one of the pair of electron emission electrodes, and the potential applied to the other of the pair of electron emission electrodes is selected. The light source device according to claim 1, wherein the light source device is applied positively. 5. A light emitting chamber formed by dividing the inside of a straight tube into at least three parts and applying a light emitting agent of a primary color to each of the divided inner wall surfaces. The light emitting chambers are substantially equal to the openings of the light emitting chambers. A pair of electron emission electrodes arranged at a distance position, and arranged in the vicinity of the electron emission electrodes to generate an electric field to deflect the electrons emitted from the electron emission electrodes and selectively select the divided light emitting chambers. A fluorescent tube having a control electrode to pass through, a light emission drive means for alternating-current driving a pair of electron emission electrodes of the fluorescent tube to emit light in any of the light emitting chambers, and the control electrode to drive the electron emission electrode. A light source device, comprising: time-division driving means for deflecting electrons emitted from the light-emitting device and controlling the light emission position of the light emission chamber in a time-division manner. 6. A light-emission chamber formed by dividing the inside of the tube into at least three parts and applying a luminescent agent of a primary color to each of the divided inner wall surfaces, at substantially equal distances from the openings of the respective light-emission chambers. A pair of electron emission electrodes arranged and arranged in the vicinity of the electron emission electrode to generate an electric field to deflect the electrons emitted from the electron emission electrode and selectively pass through the divided light emitting chambers. A fluorescent tube having a control electrode, an emission driving means for driving AC of a pair of electron emitting electrodes of the fluorescent tube to emit light in any of the light emitting chambers, and driving the control electrode to emit light from the electron emitting electrode. Time-division driving means for deflecting electrons to control the light-emitting position of the light-emitting chamber in a time-division manner, a transmissive liquid crystal display panel arranged via the fluorescent tube and a diffusion plate, and the time-division driving means. Synchronize with the above fluorescent tube Color liquid crystal display device, characterized in that a color image corresponding to the color to be emitted and comprises an image display drive means for splitting the display driving during the liquid crystal display panel.