JP2010014761A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display allowing the screen size thereof to be enlarged without shortening the life of a fluorescent tube. <P>SOLUTION: The liquid crystal display has at least: a rectangular liquid crystal display panel; and a backlight disposed on the rear surface of the liquid crystal display panel. The backlight has: a plurality of fluorescent tubes whose tube axial directions are parallel to the short side of the liquid crystal display panel and which are arranged side by side along the long side of the liquid crystal display panel; and a frame housing the fluorescent tubes, and distances between the frame and each fluorescent tube are different at both ends of the fluorescent tube. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including a direct backlight on the back of a liquid crystal display panel.

  The liquid crystal display panel is configured to independently control the light transmittance through the liquid crystal in each pixel. For this reason, a backlight is usually provided on the back of the liquid crystal display panel.

  As the size of the liquid crystal display device is increased, a so-called direct type that can make the surface light source uniform is used as a backlight.

  Such a backlight has a plurality of fluorescent tubes arranged in parallel in a plane facing the liquid crystal display panel, and a frame that supports the fluorescent tubes, and is disposed on a surface of the frame that supports the fluorescent tubes. The reflection sheet is provided.

  As the fluorescent tube, for example, a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) is used.

  Such a fluorescent tube is one in which a liquid crystal display device is used upright with respect to a horizontal plane. The tube axis direction is made to coincide with the horizontal direction, and the respective fluorescent tubes are arranged in parallel in a direction perpendicular to the tube axis direction ( So-called lateral arrangement).

The liquid crystal display device having such a configuration is disclosed in, for example, Patent Document 1 below.
JP 2005-347259 A

  The liquid crystal display device having the above-described configuration is applied to a display device such as a television. In recent years, televisions have increased in size, and liquid crystal display panels have been required to be further increased in size. However, since the length of the fluorescent tube is limited, the enlargement has a limit.

  That is, for example, when an external electrode fluorescent tube is supplied with power of a certain voltage or higher, ozone is generated in the vicinity of the electrode. A phenomenon that the voltage rises occurs.

  For this reason, there is a limit to lengthening the external electrode fluorescent tube, and accordingly, the screen size of the liquid crystal display panel is limited to 37 inches.

  Therefore, the present inventors tried to arrange the external electrode fluorescent tubes in the horizontal direction (so-called vertical arrangement) so that the tube axis direction coincides with the direction orthogonal to the horizontal direction. In this case, the horizontal length of the screen can be increased by increasing the number of external electrode fluorescent tubes, and the screen size can be increased.

  However, when it comprised in this way, the new subject came to arise. That is, in the liquid crystal display device that is used upright with respect to a horizontal plane, each external electrode fluorescent tube arranged as described above has a temperature gradient in which the temperature is higher above the lower side in the tube axis direction. Will be placed in the environment.

  In the liquid crystal display device, the difference in the heat transfer coefficient between the liquid crystal display panel and the module exterior of the backlight and the air between them causes natural convection and the above-described temperature gradient.

  For this reason, the mercury in the external electrode fluorescent tube is biased toward the low temperature portion, that is, the end portion positioned below, and the life of the external electrode fluorescent tube is shortened.

  This mercury bias is not limited to the external electrode fluorescent tube, and is the same in the case of the cold cathode fluorescent tube.

  An object of the present invention is to provide a liquid crystal display device capable of increasing the screen size without shortening the life of the fluorescent tube.

  In the liquid crystal display device of the present invention, the plurality of fluorescent tubes of the backlight are juxtaposed in the horizontal direction so that the tube axis direction thereof coincides with the direction orthogonal to the horizontal direction, and the tube axis direction of each fluorescent tube The temperature difference in can be made as small as possible.

(1) The liquid crystal display device of the present invention is, for example, a liquid crystal display device having at least a liquid crystal display panel having a rectangular shape and a backlight disposed on the back surface of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes arranged in parallel along the long side of the liquid crystal display panel, and a frame for housing these fluorescent tubes. Prepared,
The distance between the frame and each fluorescent tube is different at both ends of the fluorescent tube.

(2) In the liquid crystal display device of the present invention, for example, in the state in which the liquid crystal display device is used upright in (1), the frame is separated from each fluorescent tube from the upper end side of the fluorescent tube. It is characterized by being configured to increase sequentially toward the lower end side.

(3) In the liquid crystal display device according to the present invention, for example, in (1), the frame is formed by mixing a portion in which the distance from each fluorescent tube of the frame is different from a portion different from both ends of the fluorescent tube. It is characterized by being.

(4) In the liquid crystal display device of the present invention, for example, in (3), a portion having a different separation distance from the fluorescent tube of the frame is formed at a position overlapping with the fluorescent tube, The portion where the separation distance is not different is formed at a position that does not overlap the fluorescent tube.

(5) In the liquid crystal display device of the present invention, for example, in (1), in a state where the liquid crystal display device is used upright, the frame is on the lower end side of each fluorescent tube in a direction crossing the fluorescent tube. It has the recessed part extended, It is characterized by the above-mentioned.

(6) In the liquid crystal display device of the present invention, for example, in (1), the fluorescent tube is an external electrode fluorescent tube.

(7) In the liquid crystal display device of the present invention, for example, in (1), the fluorescent tube is a cold cathode fluorescent tube.

(8) The liquid crystal display device of the present invention is, for example, a liquid crystal display device that is used upright with respect to a horizontal plane,
At least a rectangular liquid crystal display panel and a backlight disposed on the back of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes arranged in parallel along the long side of the liquid crystal display panel, and a frame for housing these fluorescent tubes. Prepared,
A power supply circuit board extending in a direction intersecting with the fluorescent tube is mounted on a lower end side of each fluorescent tube on a surface of the frame opposite to a surface storing each fluorescent tube.

(9) The liquid crystal display device of the present invention is, for example, a liquid crystal display device that is used upright with respect to a horizontal plane,
At least a rectangular liquid crystal display panel and a backlight disposed on the back of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes arranged in parallel along the long side of the liquid crystal display panel, and a frame for housing these fluorescent tubes. Prepared,
A heat dissipating fin arranged in parallel with the fluorescent tube is formed on the upper end side of each fluorescent tube on the surface of the frame opposite to the surface storing each fluorescent tube.

(10) The liquid crystal display device of the present invention is, for example, a liquid crystal display device that is used upright with respect to a horizontal plane,
At least a rectangular liquid crystal display panel and a backlight disposed on the back of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes along the long side of the liquid crystal display panel, and a frame that accommodates these fluorescent tubes,
A radiation portion extending in a direction intersecting with the fluorescent tube is formed on an upper end side of each fluorescent tube on a surface of the frame opposite to a surface storing each fluorescent tube.

(11) In the liquid crystal display device of the present invention, for example, in any one of (8) to (10), the distance from the fluorescent tube of the frame is larger on the lower end side than the upper end side of the fluorescent tube. It is characterized by being.

(12) In the liquid crystal display device of the present invention, for example, in any one of (8) to (10), the fluorescent tube is an external electrode fluorescent tube.

  (13) In the liquid crystal display device of the present invention, for example, in any one of (8) to (10), the fluorescent tube is a cold cathode fluorescent tube.

The above-described configuration is merely an example, and the present invention can be modified as appropriate without departing from the technical idea. Further, examples of the configuration of the present invention other than the above-described configuration will be clarified from the entire description of the present specification or the drawings.

  The liquid crystal display device configured as described above can increase the screen size without shortening the life of the fluorescent tube.

  Other effects of the present invention will become apparent from the description of the entire specification.

  Embodiments of the present invention will be described with reference to the drawings. In each drawing and each example, the same or similar components are denoted by the same reference numerals and description thereof is omitted.

<Example 1>
(overall structure)
FIG. 2 is a schematic configuration diagram showing an embodiment of the liquid crystal display device according to the present invention.

  First, the liquid crystal display panel PNL, the optical sheet OS, and the backlight BL are sequentially arranged.

  The liquid crystal display panel PNL includes a pair of parallelly arranged substrates SUB1 and SUB2 made of glass, for example, as an envelope, and a liquid crystal is sandwiched between the substrates SUB1 and SUB2.

  Pixels (not shown) arranged in a matrix are formed as liquid crystal elements on the liquid crystal side surface of the substrates SUB1 and SUB2, and the light transmittance of the liquid crystal can be controlled for each of these pixels. ing.

  Then, the area where these pixels are formed is defined as a liquid crystal display area AR (area within a one-dot chain line in the figure), light from a backlight BL described later is irradiated over the entire area of the liquid crystal display area AR, and each pixel is transmitted. The viewer is made to recognize the image through the light. The liquid crystal display area AR is a rectangular area in which the length in the x-direction side is longer than the length in the y-direction side.

  The substrate SUB1 disposed behind the observer has, for example, portions exposed from the substrate SUB2 on the left side and the upper side in the drawing, and in these portions, one side portion of the plurality of semiconductor devices SCDh and SCDv is formed. Connected. These semiconductor devices SCDh and SCDv are so-called tape carrier type semiconductor devices, and are configured such that a semiconductor chip CH is mounted on the upper surface of a flexible substrate FB on which wiring is formed.

  Each of these semiconductor devices SCDh, SCDv is composed of a circuit that drives each pixel independently. For example, a plurality of semiconductor devices SCDv arranged in parallel in the y direction in the figure constitute a scanning signal drive circuit, and are arranged in parallel in the x direction in the figure. The plurality of semiconductor devices SCDh to be configured constitute a video signal driving circuit.

  The semiconductor device SCDh composed of the video signal drive circuit is connected to the printed circuit board PCB on the other side opposite to the side connected to the substrate SUB1, and an external input signal is input through the printed circuit board PCB.

  In the semiconductor device SCDv composed of the scanning signal driving circuit, the external input signal is inputted through a wiring (not shown) formed on the surface of the substrate SUB1, and therefore the substrate corresponding to the printed circuit board PCB. Is not equipped with.

  On the back surface of the liquid crystal display panel PNL configured in this way, a backlight BL is disposed via an optical sheet OS made of a laminated body such as a prism sheet and a diffusion sheet. The optical sheet OS diffuses and collects light from the backlight and guides it to the liquid crystal display panel PNL side.

  The backlight BL is referred to as a so-called direct type, and a plurality of, for example, external electrode fluorescent tubes EFL are provided on a box-shaped frame (lower frame DFR) in which a light reflecting sheet RS is disposed on the inner surface facing the liquid crystal display panel PNL. It consists of a side-by-side configuration. In this case, each external electrode fluorescent tube EFL has its tube axis direction positioned in the x direction in the figure, and is juxtaposed in the x direction and housed in the lower frame DFR. Thereby, the liquid crystal display area AR of the liquid crystal display panel PNL can have the length of the side in the x direction substantially equal to the length in the tube axis direction of the external electrode fluorescent tube EFL, and the length of the side in the y direction can be set to the external electrode fluorescence. This can correspond to the number of juxtaposed tubes EFL. Therefore, a liquid crystal display panel having a large screen size can be applied by using the backlight BL as described above. A more detailed configuration of the backlight BL will be described later.

  Such a liquid crystal display panel PNL, the optical sheet OS, and the backlight BL are modularized by an upper frame (not shown) and an intermediate frame that are engaged with the lower frame of the backlight BL. .

  As shown in FIG. 3, the liquid crystal display device according to the present invention is used upright with respect to a horizontal plane. At that time, the liquid crystal display panel PNL, the optical sheet OS, and the backlight of the liquid crystal display device are used. The vertical direction of BL corresponds to the vertical direction of the liquid crystal display panel PNL, the optical sheet OS, and the backlight BL shown in FIG. Therefore, the external electrode fluorescent tubes EFL in the liquid crystal display device set up with respect to the horizontal plane are arranged so that the tube axis direction coincides with the direction orthogonal to the horizontal direction and is arranged in parallel in the horizontal direction. Become.

(Backlight BL)
FIG. 4 shows only the backlight BL extracted from FIG. Here, a sectional view taken along line I (a) -I (a) in FIG. 4 is shown in FIG. 1A, and a sectional view taken along line I (b) -I (b) is shown in FIG. . 1A and 1B also depict a liquid crystal display panel PNL and an optical sheet OS in addition to the backlight BL.

  The lower frame DFR is configured such that a surface (indicated by BF in the drawing) facing the liquid crystal display panel PNL gradually widens the distance from the liquid crystal display panel PNL from above to below. On the other hand, the external electrode fluorescent tube EFL is positioned in a plane parallel to the liquid crystal display panel PNL, and is supported on the surface BF of the lower frame DFR via the support electrodes (not shown) at the electrodes TM at both ends thereof. Yes. The support electrode also serves as an electrode for supplying power to the external electrode fluorescent tube EFL through the electrode TM.

  The external electrode fluorescent lamp EFL arranged in this way has a gradually increasing distance from the surface BF of the lower frame DFR from the top to the bottom. In other words, when the distance between the upper end lower frame DFR of the external electrode fluorescent tube EFL and the surface BF of the lower frame DFR is Du, and the distance of the lower end lower frame DFR of the surface BF is Dd, Du <Dd. The distance from the surface BF of the lower frame DFR is gradually increased from Du to Dd from the upper end to the lower end of the electrode fluorescent tube EFL.

  A reflective sheet RS is disposed between the lower frame DFR and the external electrode fluorescent tube EFL. The reflective sheet RS is a bent sheet in which each side in the x direction is bent toward the liquid crystal display panel PNL side. The end of the external electrode fluorescent tube EFL where the electrode TM is formed is positioned behind the bent portion BND through the hole HL formed in the bent portion BND. The bent portion BND of the reflection sheet RS has a function of reflecting light from the external electrode fluorescent tube EFL to the liquid crystal display panel PNL side.

  When the backlight BL configured as described above is used in a horizontal plane together with the liquid crystal display panel PNL, the backlight BL is largely separated from the surface BF of the lower frame DFR below the external electrode fluorescent tube EFL. , The heat insulation effect by air becomes larger than the upper side of the external electrode fluorescent tube EFL.

  For this reason, in the tube axis direction of the external electrode fluorescent tube EFL, the heat distribution can be made substantially uniform, and the occurrence of the phenomenon that the temperature is particularly lowered at the lower end can be suppressed. Therefore, the bias at the lower end of mercury in the external electrode fluorescent tube can be avoided, and the life of the external electrode fluorescent tube can be improved.

<Example 2>
FIG. 5 is a diagram for explaining a second embodiment of the liquid crystal display device according to the present invention and corresponds to FIG. 5A is a cross-sectional view of a portion corresponding to the line I (a) -I (a) in FIG. 4, and FIG. 5B is a line I (b) -I (b) in FIG. It is sectional drawing of the location corresponded to. In FIG. 5, drawing of the liquid crystal display panel PNL and the optical sheet OS is omitted.

  A configuration different from the case of FIG. 1 is the shape of the surface BF of the lower frame DFR. Immediately below the external electrode fluorescent tube EFL, as shown in FIG. 5A, as in the case of the embodiment of FIG. 1, the interval is gradually increased from the surface of the liquid crystal display panel PNL (not shown) from the top to the bottom. It is configured in this way. In the region between the external electrode fluorescent tube EFL and another adjacent external electrode fluorescent tube EFL, as shown in FIG. 5B, from the top to the bottom, from the surface of the liquid crystal display panel PNL (not shown), etc. It is comprised so that it may become a space | interval. That is, on the surface of the lower frame DFR that accommodates the external electrode fluorescent tube EFL, a concave portion is formed immediately below the external electrode fluorescent tube EFL along the tube axis direction of the external electrode fluorescent tube EFL. The electrode fluorescent tube EFL is formed to have a bottom surface that gradually increases in depth from the upper side to the lower side.

  Also in this case, each external electrode fluorescent tube EFL can gradually increase the distance from the surface BF of the lower frame DFR from above to below.

  Therefore, as in the first embodiment, the heat distribution can be made substantially uniform in the tube axis direction of the external electrode fluorescent tube EFL, and the occurrence of a phenomenon that the temperature becomes particularly low at the lower end can be suppressed.

<Example 3>
FIG. 6 is a view for explaining a third embodiment of the liquid crystal display device according to the present invention and corresponds to FIG. In FIG. 6, drawing of the liquid crystal display panel PNL and the optical sheet OS is omitted.

  6 differs from FIG. 1A in that a recessed portion DNT is formed on the lower side of the lower frame DFR. In this case, as shown in FIG. 7 drawn corresponding to FIG. 4, the recessed portion DNT is formed to extend in the x direction in the drawing so as to intersect all the external electrode fluorescent tubes EFL. 6 corresponds to a cross section taken along line VI-VI in FIG.

  In this case, if the separation distance from the surface BF of the lower frame DFR at the upper end of the external electrode fluorescent tube EFL is Du and the separation distance from the surface BF of the lower frame DFR at the lower end is Dd, Du <Dd. For this reason, a relatively large space can be formed between the lower end portion of the external electrode fluorescent tube EFL and the surface BF of the lower frame DFR. In this space, the heat insulation effect by the air is higher than the upper side of the external electrode fluorescent tube EFL. Can be bigger. Therefore, the same effects as those of the first embodiment are obtained.

<Example 4>
FIG. 8 is a view for explaining an embodiment 4 of the liquid crystal display device according to the present invention and corresponds to FIG.

  In FIG. 8, the configuration different from that in FIG. 1A is configured such that the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. The external electrode fluorescent tube EFL is arranged such that the distance from the surface BF of the lower frame DFR is Du at the upper end and the distance Dd (> Du) from the surface BF of the lower frame DFR at the lower end. .

  Even in this case, a relatively large space can be formed between the lower end portion of the external electrode fluorescent tube EFL and the surface BF of the lower frame DFR. It can be larger than the upper side of the EFL. Therefore, the same effects as those of the first embodiment are obtained.

  FIG. 8 shows a configuration in which the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. However, for example, as in the case of the first embodiment, the surface BF facing the liquid crystal display panel PNL may be configured to gradually widen the distance from the liquid crystal display panel PNL from above to below. This is also because a large space can be formed between the lower end portion of the external electrode fluorescent tube EFL and the surface BF of the lower frame DFR.

<Example 5>
FIG. 9 is a diagram for explaining a fifth embodiment of the liquid crystal display device according to the present invention and corresponds to FIG. In FIG. 9, the liquid crystal display panel PNL and the optical sheet OS are omitted.

  In FIG. 9, the configuration different from that in FIG. 1A is configured such that the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. The power supply circuit board PWB is mounted on the surface opposite to the surface on which the external electrode fluorescent tube EFL is disposed below the lower frame DFR. In this case, as shown in FIG. 10 drawn corresponding to FIG. 4, the power supply circuit board PWB is formed to extend in the x direction in the drawing so as to intersect all the external electrode fluorescent tubes EFL. Is desirable. However, this is not necessarily required if the lower end of each external electrode fluorescent tube EFL is sufficiently warmed in consideration of heat transfer. 9 corresponds to a cross section taken along line IX-IX in FIG. The power supply circuit board PWB includes an inverter circuit that drives and controls the external electrode fluorescent tube EFL, and generates heat when the external electrode fluorescent tube EFL is driven.

  For this reason, the lower end of the external electrode fluorescent tube EFL is warmed by the power supply circuit board PWB, the temperature difference from the upper end of the external electrode fluorescent tube EFL can be reduced, and the temperature distribution in the tube axis direction of the external electrode fluorescent tube EFL is substantially reduced. It can be made uniform. Therefore, the same effects as those of the first embodiment are obtained.

  Note that FIG. 9 is configured such that the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. However, for example, as in the case of the first embodiment, the surface BF facing the liquid crystal display panel PNL may be configured to gradually widen the distance from the liquid crystal display panel PNL from above to below. This is also because a large space can be formed between the lower end portion of the external electrode fluorescent tube EFL and the surface BF of the lower frame DFR.

<Example 6>
FIG. 11 is a view for explaining an embodiment 6 of the liquid crystal display device according to the present invention and corresponds to FIG. In FIG. 11, the liquid crystal display panel PNL and the optical sheet OS are omitted.

  In FIG. 11, the configuration different from that in FIG. 1A is configured such that the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. In addition, on the upper side of the lower frame DFR, the radiation fins DHF are mounted on the surface opposite to the surface on which the external electrode fluorescent tube EFL is disposed. For example, the heat dissipating fin DHF is formed by arranging a plurality of tongue pieces formed by forming a U-shaped notch in the lower frame DFR so as to be perpendicular to the lower frame DFR surface. Can be formed. In this case, the radiating fin DHF is formed to extend in the x direction in the drawing so as to intersect with all the external electrode fluorescent tubes EFL as shown in FIG. 12 corresponding to FIG. desirable. However, if heat transfer is taken into consideration and the upper end of each external electrode fluorescent tube EFL is sufficiently cooled, this is not always necessary. 11 corresponds to a cross section taken along line XI-XI in FIG.

  In this case, the upper end of the external electrode fluorescent tube EFL is cooled by the radiation fins DHF, and the temperature difference from the lower end of the external electrode fluorescent tube EFL can be reduced, and the temperature distribution in the tube axis direction of the external electrode fluorescent tube EFL Can be made substantially uniform. Therefore, the same effects as those of the first embodiment are obtained.

  Note that FIG. 11 is configured such that the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. However, for example, as in the case of the first embodiment, the surface BF facing the liquid crystal display panel PNL may be configured to gradually widen the distance from the liquid crystal display panel PNL from above to below. This is also because a large space can be formed between the lower end portion of the external electrode fluorescent tube EFL and the surface BF of the lower frame DFR.

<Example 7>
FIG. 13 is a view for explaining an embodiment 7 of the liquid crystal display device according to the present invention and corresponds to FIG. In FIG. 13, the liquid crystal display panel PNL and the optical sheet OS are omitted.

  In FIG. 13, the configuration different from that in FIG. 1A is configured such that the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. Then, on the upper side of the lower frame DFR, the black coating portion BCP with black coating is formed on the surface opposite to the surface on which the external electrode fluorescent tube EFL is disposed. The black coating portion BCP is formed in a region corresponding to a region where the heat dissipating fins DHF are formed in FIG.

  When formed in this way, the black coating portion BCP has an effect of improving the radiation efficiency as compared with the lower side of the lower frame DFR, and can reduce the temperature difference from the lower end of the external electrode fluorescent tube EFL. Therefore, the temperature distribution can be made substantially uniform in the tube axis direction of the external electrode fluorescent tube EFL, and the same effect as in the first embodiment can be obtained.

  Note that FIG. 13 is configured such that the surface BF of the lower frame DFR is parallel to the liquid crystal display panel PNL. However, for example, as in the case of the first embodiment, the surface BF facing the liquid crystal display panel PNL may be configured to gradually widen the distance from the liquid crystal display panel PNL from above to below. This is also because a large space can be formed between the lower end portion of the external electrode fluorescent tube EFL and the surface BF of the lower frame DFR.

  In each of the above-described embodiments, the external electrode fluorescent tube is used as the light source of the backlight BL. However, the present invention is not limited to this, and may be a cold cathode fluorescent tube, for example.

It is sectional drawing which shows Example 1 of the liquid crystal display device by this invention. It is a disassembled perspective view which shows Example 1 of the liquid crystal display device by this invention. It is an external view which shows Example 1 of the liquid crystal display device by this invention. It is the top view which took out only the backlight of Example 1 of the liquid crystal display device by this invention. It is sectional drawing which shows Example 2 of the liquid crystal display device by this invention. It is sectional drawing which shows Example 3 of the liquid crystal display device by this invention. It is a top view of the backlight which shows Example 3 of the liquid crystal display device by this invention. It is sectional drawing which shows Example 4 of the liquid crystal display device by this invention. It is sectional drawing which shows Example 5 of the liquid crystal display device by this invention. It is a top view of the backlight which shows Example 5 of the liquid crystal display device by this invention. It is sectional drawing which shows Example 6 of the liquid crystal display device by this invention. It is a top view of the backlight of Example 6 of the liquid crystal display device by this invention. It is sectional drawing which shows Example 7 of the liquid crystal display device by this invention.

Explanation of symbols

PNL: Liquid crystal display panel, SUB1, SUB2: Substrate, AR: Liquid crystal display area, SCDh: Video signal driving circuit, SCDv: Scanning signal driving circuit, CH: Semiconductor chip, FB: Flexible substrate, OS ... Optical sheet, BL ... Backlight, DFR ... Lower frame, RS ... Reflective sheet, HL ... Hole, BND ... Bending part, EFL ... This part electrode fluorescent tube, TM ... Electrode.

Claims (13)

At least a liquid crystal display panel having a rectangular shape, and a liquid crystal display device having a backlight disposed on the back of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes arranged in parallel along the long side of the liquid crystal display panel, and a frame for housing these fluorescent tubes. Prepared,
2. A liquid crystal display device according to claim 1, wherein the distance of the frame from each fluorescent tube is different at both ends of the fluorescent tube. The frame is configured such that, in a state where the liquid crystal display device is used in an upright manner, the distance between the frame and each fluorescent tube gradually increases from the upper end side to the lower end side of the fluorescent tube. Item 2. A liquid crystal display device according to item 1. 2. The liquid crystal display device according to claim 1, wherein the frame is formed by mixing a portion in which a distance from each fluorescent tube of the frame is different from a portion different from both ends of the fluorescent tube. The part of the frame with a different distance from the fluorescent tube is formed at a position overlapping with the fluorescent tube, and the part of the frame with a different distance from the fluorescent tube is formed at a position not overlapping with the fluorescent tube. The liquid crystal display device according to claim 3. 2. The frame according to claim 1, wherein in a state where the liquid crystal display device is used in an upright manner, the frame has a recessed portion extending in a direction intersecting the fluorescent tube on a lower end side of each fluorescent tube. Liquid crystal display device.   The liquid crystal display device according to claim 1, wherein the fluorescent tube is an external electrode fluorescent tube.   The liquid crystal display device according to claim 1, wherein the fluorescent tube is a cold cathode fluorescent tube. A liquid crystal display device used standing up against a horizontal plane,
At least a rectangular liquid crystal display panel and a backlight disposed on the back of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes arranged in parallel along the long side of the liquid crystal display panel, and a frame for housing these fluorescent tubes. Prepared,
A liquid crystal display, wherein a power circuit board extending in a direction intersecting with the fluorescent tube is mounted on a lower end side of each fluorescent tube on a surface of the frame opposite to a surface storing each fluorescent tube. apparatus. A liquid crystal display device used standing up against a horizontal plane,
At least a rectangular liquid crystal display panel and a backlight disposed on the back of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes arranged in parallel along the long side of the liquid crystal display panel, and a frame for housing these fluorescent tubes. Prepared,
A liquid crystal display characterized in that a heat dissipating fin arranged in parallel to the direction intersecting the fluorescent tube is formed on the upper end side of each fluorescent tube on the surface of the frame opposite to the surface storing each fluorescent tube. apparatus. A liquid crystal display device used standing up against a horizontal plane,
At least a rectangular liquid crystal display panel and a backlight disposed on the back of the liquid crystal display panel,
The backlight has a tube axis direction parallel to the short side of the liquid crystal display panel, a plurality of fluorescent tubes along the long side of the liquid crystal display panel, and a frame that accommodates these fluorescent tubes,
A liquid crystal display, wherein a radiation portion extending in a direction intersecting with the fluorescent tube is formed on an upper end side of each fluorescent tube on a surface of the frame opposite to a surface storing each fluorescent tube. apparatus. 11. The liquid crystal display device according to claim 8, wherein a distance between the frame and each fluorescent tube is larger on a lower end side than on an upper end side of the fluorescent tube.   The liquid crystal display device according to claim 8, wherein the fluorescent tube is an external electrode fluorescent tube.   The liquid crystal display device according to claim 8, wherein the fluorescent tube is a cold cathode fluorescent tube.

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