JP2007322884A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device in which light emitting from a light source is appropriately diffused by a sealing member in the light source side or by a sealing pattern disposed between the light source and the sealing member, so as to eliminate luminance unevenness. <P>SOLUTION: The liquid crystal display device (10) includes: a liquid crystal panel (40) having an effective display region to display information and having a liquid crystal held between a pair of substrates; a light source (30) emitting light to irradiate the liquid crystal panel through the side face; and a sealing member (100) disposed around the liquid crystal so as to seal the liquid crystal between the pair of substrates and having a control region (101) disposed in the light source side of the liquid crystal panel and a peripheral region disposed except for the light source side of the liquid crystal panel, with the control region specified based on the light emission characteristics of the light source so as to diffuse the light emitted from the light source into the effective display region. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device having an effective display area without uneven brightness.

  FIG. 1 is a diagram illustrating an example of a conventional liquid crystal display device 1.

  A liquid crystal display device 1 shown in FIG. 1 includes a liquid crystal panel 2 and a point light source 9. In the liquid crystal panel 2, liquid crystal is sandwiched between substrates by a seal member 3 and a sealing portion 4. Further, the light emitted from the point light source 9 diffuses into the liquid crystal panel 2 as indicated by an arrow 5. However, in the regions 6 and 8 in the figure, the light is not sufficiently diffused and the luminance is lowered. On the other hand, in the region 7 in the figure, the luminance is increased due to being close to the light source, and an eyeball phenomenon may occur. . As described above, the conventional liquid crystal display device 1 has a problem that luminance unevenness occurs as a whole.

  Therefore, an attempt has been made to eliminate luminance unevenness by mixing light diffusing particles into a light source side sealing member and diffusing light by the light diffusing particles (see, for example, Patent Document 1). However, when the light diffusing particles are mixed with the light source side sealing member, light diffusion occurs at the light source side sealing member. Therefore, light does not reach the entire liquid crystal panel, and the luminance of the regions 6 and 8 in FIG. The decrease can be prevented, but conversely, a decrease in luminance occurs at a location away from the light source. On the other hand, if a small amount of light diffusing particles is mixed with the sealing member on the light source side, sufficient light diffusion does not occur, and it is impossible to prevent a decrease in luminance in the regions 6 and 8 in FIG. there were.

  Also, provide a predetermined gap between the light source and the liquid crystal, and form a rough crushed surface processed into a frosted glass on the glass substrate between them, and diffuse the light using the rough crushed surface to eliminate uneven brightness (See, for example, Patent Document 2). However, it is difficult to process only a predetermined portion of the substrate, and the cost is increased.

  In addition, an interval is provided between the liquid crystal and the effective display area, and a polymer dispersed liquid crystal is disposed between them, or a scattering segment is provided by the polymer dispersed liquid crystal, and light is diffused by the liquid crystal itself or the scattering segment. Attempts have been made to eliminate luminance unevenness (see, for example, Patent Document 2). However, expensive polymer-dispersed liquid crystal must be used, liquid crystal must be sealed separately for the scattering segment by polymer-dispersed liquid crystal, and / or simply display effective with liquid crystal The polymer-dispersed liquid crystal provided between the regions has a problem that it is difficult to effectively use light.

Japanese Patent Laid-Open No. 11-183888 (FIG. 1) Japanese Patent Laid-Open No. 2000-162672 (FIGS. 4, 5 and 6)

  Accordingly, the present invention provides a liquid crystal display device that can form an adjustment region by a light source side seal member and appropriately diffuse the light emitted from the light source by the adjustment region to eliminate luminance unevenness. For the purpose.

  In addition, the present invention provides a liquid crystal display device in which a seal pattern is formed between a light source and a seal member, and light emitted from the light source is appropriately diffused by the seal pattern to eliminate luminance unevenness. The purpose is to provide.

  In order to solve the above problems, a liquid crystal display device according to the present invention includes a liquid crystal panel having an effective display area for displaying information and sandwiching liquid crystal between a pair of substrates, and light from a side surface of the liquid crystal panel. A light source for irradiating, a liquid crystal panel arranged around the liquid crystal to enclose the liquid crystal between a pair of substrates, an adjustment area arranged on the light source side of the liquid crystal panel, and a peripheral area arranged outside the liquid crystal panel And the adjustment region has a seal member that is defined based on the light emission characteristics of the light source in order to diffuse the light emitted from the light source to the effective display region.

  In order to solve the above problems, a liquid crystal display device according to the present invention includes a liquid crystal panel having an effective display area for displaying information and a liquid crystal sandwiched between a pair of substrates, and a side surface of the liquid crystal panel. A light source for irradiating light, a seal member disposed around the liquid crystal to enclose the liquid crystal between the pair of substrates, and between the pair of substrates, between the light source and the seal member, It has a seal pattern for diffusing light emitted from a light source to an effective display area. Liquid crystal display device.

  In the liquid crystal display device according to the present invention, the adjustment region is formed by the seal member on the light source side, and the light irradiated from the light source is appropriately diffused by the adjustment region, so that it is possible to eliminate luminance unevenness at low cost. became. Furthermore, in the liquid crystal display device according to the present invention, the shape of the seal member can be changed in accordance with characteristics such as the light emission intensity of the light source, so that it is possible to reliably eliminate luminance unevenness.

  In the liquid crystal display device according to the present invention, a seal pattern is formed between the light source and the seal member, and the light irradiated from the light source is appropriately diffused by the seal pattern, so that uneven brightness can be eliminated at low cost. It has become possible. Furthermore, in the liquid crystal display device according to the present invention, the shape of the seal pattern can be changed in accordance with characteristics such as the light emission intensity of the light source, so that it is possible to surely eliminate luminance unevenness.

  Hereinafter, a liquid crystal display device according to the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram showing a schematic configuration of the liquid crystal display device 10 according to the present invention.

  2A is a front view of the liquid crystal display device 10, and FIG. 2B is a cross-sectional view taken along line AA 'in FIG. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 40 and a W (white) LED 30 that functions as a point light source disposed on a side surface of the liquid crystal panel 40.

  In the liquid crystal panel 40, the pair of glass substrates 201 and 202 are joined by the sealing member 100, the liquid crystal 203 is injected from the opening of the sealing member so as to be sandwiched between the pair of glass substrates, and sealed by the sealing material 207. It has stopped. Further, on the viewing side of the liquid crystal panel 40 (upper side in FIG. 2B), a prism sheet 204 and a polarizing plate 206 joined to the upper part of the prism sheet 204 via an air layer are arranged, and on the opposite side. A reflective polarizing plate 205 is disposed. The liquid crystal panel 40 is a TFT-type liquid crystal display unit that is actively driven, and can perform display of 2.4 inches and a QVGA size (350 × 240 pixels). In addition, a plurality of signal electrodes and a plurality of scanning electrodes made of a transparent conductor are patterned on the inside of the pair of glass substrates 201 and 202 of the liquid crystal panel 40, and a portion where the signal electrodes and the scanning electrodes overlap is a display pixel. .

  Here, STN liquid crystal is used as the liquid crystal 203, but other liquid crystal, for example, polymer dispersed liquid crystal, OCB (Optical Compensated Birefringence) using nematic liquid crystal, IPS (In Plane Switching), PVA (Patterned Vertical Alignment). ), Other modes such as SSFLC (Surface Stabilized Ferroelectric Crystal) using smectic liquid crystal, AFLC (Anti-FLC), PNLC, PDLC, and the like can also be used.

  The light emitted from the W color LED 30 enters from the side surface of the liquid crystal panel 40. The light incident on the liquid crystal panel 40 from the W color LED 30 is configured to be able to irradiate the entire effective display area 206 of the liquid crystal panel 40 while being repeatedly reflected by the prism sheet 204, the reflective polarizing plate 205, and the like. In addition, since light can be incident from the side surface of the sealing material 100, it is not necessary to arrange a backlight on the back side of the liquid crystal panel 40, and a thin liquid crystal display device that can be illuminated can be realized.

  The seal member 100 includes a spherical spacer for adjusting the gap between the pair of glass substrates 201 and 202, a columnar filler for scattering light from the W color LED 30, an adhesive, and the like. As the spacer and filler, those having physical properties of silica (refractive index 1.35 to 1.45) or plastic (refractive index 1.4 to 2.0) can be used. As a result, the liquid crystal 203 is maintained at a thickness of about 2 to 6 μm (in the case of TFT). In the case of PNLC, the thickness of the liquid crystal is preferably 10 to 30 μm, and in the case of FLC, the thickness of the liquid crystal is preferably 1 to 2 μm.

  The seal member 100 is provided with the adjustment region 101 on the side on the W color LED 30 side, but the three sides other than the adjustment region are formed to have substantially the same thickness (for example, about 0.8 mm). Are formed wider than the other sides (for example, the thickest part is about 3.2 mm). Further, the adjustment area 101 of the seal member 100 has a shape that gradually expands from a portion closest to the W color LED 30 in a quadratic curve and continues to the effective display area 206. In other words, the adjustment area 101 of the seal member 100 has a semi-cylindrical shape with the effective area 206 side as the base and the W color LED 30 side as the apex.

  Next, a schematic manufacturing method of the liquid crystal panel 40 shown in FIG. 2 will be described.

  First, a seal member 100 is formed by pattern printing inside one of a pair of glass substrates 201 and 202 on which a plurality of signal electrodes and a plurality of scanning electrodes are formed by a transparent conductor. A spacer is spread over the entire inside of the other side of 202. Next, a pair of glass substrates are overlapped and bonded. Next, liquid crystal 203 is injected from the opening 102 of the seal member 100 and sealed with a sealant 207. Next, a prism sheet 204 is disposed outside the glass substrate 201 of the liquid crystal panel 40, and a polarizing plate 206 is disposed on the prism sheet 204 via an air layer. Next, a reflective polarizing plate 205 is attached to the outside of the glass substrate 202.

  The light incident on the liquid crystal panel 40 from the W color LED 30 is diffused sufficiently wide by the adjustment region 101 of the seal member 100, so that there is no decrease in luminance in the portions corresponding to the regions 6 and 8 in FIG. In addition, excessive concentration of luminance does not occur in a portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  FIG. 3 is a diagram showing a schematic configuration of another liquid crystal display device 11 according to the present invention.

  The difference between the liquid crystal display device 11 shown in FIG. 3 and the liquid crystal display device 10 shown in FIG. 2 is that the shape of the adjustment region 104 on the W color LED 30 side in the seal member 103 of the liquid crystal panel 41 is different. In the present embodiment, the same components as those in FIG.

  The seal member 103 is formed to have substantially the same thickness (for example, about 0.8 mm) on three sides other than the adjustment region 104 on the W color LED 30 side, and only the adjustment region 104 on the W color LED 30 side is more than the other sides. It is formed wide (for example, the thickest part is about 3.2 mm). In the present embodiment, the adjustment region 104 of the seal member 103 has a shape that gradually expands in a hyperbola from the portion closest to the W color LED 30 and continues to the effective display region 206. In other words, the adjustment region 104 of the seal member 103 has a substantially trapezoidal shape (Mt. Fuji shape) in which the W-color LED 30 side is the top side, the effective display region 206 side is the bottom side, and the left and right are arcuate. .

  The light incident on the liquid crystal panel 41 from the W color LED 30 is diffused sufficiently wide by the adjustment region 104 of the seal member 103, so that there is no decrease in luminance in portions corresponding to the regions 6 and 8 in FIG. In addition, excessive concentration of luminance does not occur in a portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  FIG. 4 is a diagram illustrating an example of the light amount distribution of the W color LED.

  In FIG. 4, the y-axis indicates the amount of light, and the x-axis indicates the angle from the light source. Note that the point P indicates the LED light directly above (0 °), the curve L1 indicates the light amount distribution of the W color LED having a narrow light amount distribution, and the curve L2 indicates the light amount distribution of the W color LED having a broad light amount distribution. Is shown.

  When the light quantity distribution of the W color LED to be used is as shown by the curve L1, it is preferable that the adjustment region on the W color LED 30 side of the seal member 100 has a substantially trapezoidal shape as shown in FIG. When the LED light quantity distribution is as shown by the curve L2, it is preferable that the adjustment region on the W color LED 30 side of the seal member 100 has a kamaboko shape as shown in FIG. This is because when the light source is the type of the curve L1 with a narrow light amount distribution, the light amount becomes sharp when the angle from the center is large, and therefore a substantially trapezoidal shape with a thin adjustment region where the angle from the center is large is preferable. is there. In addition, when the light source is the type of the curve L2 having a broad light amount distribution, the amount of light is large even at a large angle from the center, and therefore a kamaboko type with a thick adjustment region where the angle from the center is large is preferable. As described above, in the liquid crystal display device according to the present invention, it is possible to select an optimal seal member shape according to the light emission characteristics of the LED in order to eliminate luminance unevenness.

  FIG. 5 is a diagram showing a schematic configuration of another liquid crystal display device 12 according to the present invention.

  The difference between the liquid crystal display device 12 shown in FIG. 5 and the liquid crystal display device 10 shown in FIG. 2 is that the shape of the adjustment region 106 on the W color LED 30 side in the seal member 105 of the liquid crystal panel 42 is different. In the present embodiment, the same components as those in FIG.

  The seal member 105 is formed to have substantially the same thickness w2 (for example, about 0.8 mm) on three sides other than the adjustment region 106 on the W color LED 30 side, and only the adjustment region 106 on the W color LED 30 side is the other side. The width w1 is wider (for example, the thickest part is about 3.2 mm).

  The light that has entered the liquid crystal panel 42 from the W color LED 30 is diffused sufficiently wide by the adjustment region 106 of the seal member 105, so that there is no reduction in luminance in the portions corresponding to the regions 6 and 8 in FIG. 1. In addition, excessive concentration of luminance does not occur in a portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, also in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30. The relationship between w1 and w2 in the seal member 105 will be described later.

  FIG. 6 is a diagram showing a schematic configuration of another liquid crystal display device 13 according to the present invention.

  The difference between the liquid crystal display device 13 shown in FIG. 6 and the liquid crystal display device 10 shown in FIG. 2 is that the two W color LEDs 30 and 31 are used, and the adjustment region on the W color LED 30 side in the seal member 107 of the liquid crystal panel 43. 108 is different in shape. The W color LED 31 is the same LED as the W color LED 30 described above, and the two LEDs are used in order to obtain higher luminance in the effective display area 206. In the present embodiment, the same components as those in FIG.

  The seal member 107 is formed in substantially the same thickness (for example, about 0.8 mm) on three sides other than the adjustment region 108, and only the adjustment region 108 is wider than the other sides (for example, the thickest portion is about 3). .2 mm). In the present embodiment, the adjustment region 108 of the seal member 107 has a shape that gradually expands in a quadratic curve from the portion closest to the W-color LEDs 30 and 31 and continues to the effective display region 206. Yes. In other words, the adjustment area 108 of the seal member 107 has a two-stage kamaboko shape with the effective display area 206 side as the base and the W-color LEDs 30 and 31 as vertices.

  The light that has entered the liquid crystal panel 43 from the W-color LEDs 30 and 31 is diffused sufficiently wide by the adjustment region 108 of the seal member 107, resulting in a decrease in luminance at portions corresponding to the regions 6 and 8 in FIG. In addition, excessive concentration of luminance does not occur in the portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LEDs 30 and 31.

  FIG. 7 is a diagram showing a schematic configuration of another liquid crystal display device 14 according to the present invention.

  The difference between the liquid crystal display device 14 shown in FIG. 7 and the liquid crystal display device 10 shown in FIG. 2 is that the two W color LEDs 30 and 31 are used, and the adjustment region on the W color LED 30 side in the seal member 109 of the liquid crystal panel 44. 110 is different in shape. The W color LED 31 is the same LED as the W color LED 30 described above, and the two LEDs are used in order to obtain higher luminance in the effective display area 206. In the present embodiment, the same components as those in FIG.

  The seal member 109 is formed so that the three sides other than the adjustment region 110 have substantially the same thickness (for example, about 0.8 mm), and only the adjustment region 110 is wider than the other sides (for example, the thickest portion is about 3). .2 mm). In the present embodiment, the adjustment region 110 of the seal member 109 has a shape that gradually expands in a hyperbola from the portion closest to the W-color LEDs 30 and 31 and continues to the effective display region 206. In other words, the adjustment area 110 of the seal member 109 has a substantially trapezoidal shape (two-stage Fuji type) with the W-color LEDs 30 and 31 side as the top, the effective display area 206 side as the bottom, and left and right concave arcs. Shape).

  The light incident on the liquid crystal panel 44 from the W-color LEDs 30 and 31 is diffused sufficiently wide by the adjustment region 110 of the seal member 109, resulting in a decrease in luminance at portions corresponding to the regions 6 and 8 in FIG. In addition, excessive concentration of luminance does not occur in the portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LEDs 30 and 31.

  FIG. 8 is a diagram showing a schematic configuration of another liquid crystal display device 15 according to the present invention.

  The difference between the liquid crystal display device 15 shown in FIG. 8 and the liquid crystal display device 10 shown in FIG. 2 is that two W-color LEDs 30 and 31 are used and the shape of the seal member 111 of the liquid crystal panel 45 is different. is there. The W color LED 31 is the same LED as the W color LED 30 described above, and the two LEDs are arranged on the left and right sides in order to obtain higher luminance in the effective display area 206. In the present embodiment, the same components as those in FIG.

  The seal member 111 is formed so that the two sides other than the adjustment regions 112 and 113 have substantially the same thickness (for example, about 0.8 mm), and the adjustment regions 112 and 113 are wider (for example, the thickest portion) than the other sides. Is approximately 3.2 mm). In the present embodiment, the adjustment regions 112 and 113 of the seal member 111 have a shape that gradually expands in a quadratic curve from the portion closest to the W-color LEDs 30 and 31, respectively, and continues to the effective display region 206. is doing. In other words, the adjustment regions 112 and 113 of the seal member 111 have a semi-cylindrical shape with the effective region 26 side as the base and the W-color LEDs 30 and 31 as vertices, respectively.

  The light incident on the liquid crystal panel 45 from the W-color LEDs 30 and 31 is diffused sufficiently wide by the adjustment regions 112 and 113 of the seal member 111, so that the luminance is reduced in the portions corresponding to the regions 6 and 8 in FIG. It does not occur, and excessive concentration of luminance does not occur in the portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Furthermore, since light enters from the left and right of the effective display area 206, the luminance does not decrease on the far side away from the W color LED in the effective display area 206. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LEDs 30 and 31.

  FIG. 9 is a diagram showing a schematic configuration of another liquid crystal display device 16 according to the present invention.

  The difference between the liquid crystal display device 16 shown in FIG. 9 and the liquid crystal display device 10 shown in FIG. 2 is that two W-color LEDs 30 and 31 are used and the shape of the seal member 114 of the liquid crystal panel 46 is different. is there. The W color LED 31 is the same LED as the W color LED 30 described above, and the two LEDs are arranged on the left and right sides in order to obtain higher luminance in the effective display area 206. In the present embodiment, the same components as those in FIG.

  The seal member 114 is formed so that the two sides other than the adjustment regions 115 and 116 have substantially the same thickness (for example, about 0.8 mm), and the adjustment regions 115 and 116 are wider than the other sides (for example, the thickest portion). Is approximately 3.2 mm). In this embodiment, the adjustment regions 115 and 116 of the seal member 114 have a shape that gradually expands in a hyperbola from the portion closest to the W-color LEDs 30 and 31, respectively, and continues to the effective display region 206. Yes. In other words, the adjustment regions 115 and 116 of the seal member 114 each have a substantially trapezoidal shape (Mt. Fuji shape) in which the W LED 30 or 31 side is the top side, the effective display region 206 side is the bottom side, and the left and right sides are concave arcs. )have.

  Since the light incident on the liquid crystal panel 46 from the W color LEDs 30 and 31 is sufficiently diffused by the adjustment regions 115 and 116 of the seal member 114, the luminance is reduced in the portions corresponding to the regions 6 and 8 in FIG. It does not occur, and excessive concentration of luminance does not occur in the portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Furthermore, since light enters from the left and right of the effective display area 206, the luminance does not decrease on the far side away from the W color LED in the effective display area 206. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LEDs 30 and 31.

  FIG. 10 is a diagram showing a schematic configuration of another liquid crystal display device 17 according to the present invention.

  The difference between the liquid crystal display device 17 shown in FIG. 10 and the liquid crystal display device 10 shown in FIG. 2 is that the shape of the seal member 117 of the liquid crystal panel 47 is different. In the present embodiment, the same components as those in FIG.

  The three sides of the seal member 117 other than the adjustment region 118 are formed to have substantially the same thickness (for example, about 0.8 mm), and the adjustment region 118 is wider than the other sides (for example, the thickest portion is about 3 mm). 2 mm). In the present embodiment, the adjustment region 118 of the seal member 117 has a substantially oval shape that continues from the W color LED 30 to the effective display region 206.

  The light incident on the liquid crystal panel 47 from the W color LED 30 is diffused sufficiently wide by the adjustment region 118 of the seal member 117, so that the luminance is not lowered in the portions corresponding to the regions 6 and 8 in FIG. In addition, excessive concentration of luminance does not occur in a portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  FIG. 11 is a diagram showing a schematic configuration of another liquid crystal display device 18 according to the present invention.

  A difference between the liquid crystal display device 18 shown in FIG. 11 and the liquid crystal display device 10 shown in FIG. 2 is that the shape of the seal member 119 of the liquid crystal panel 48 is different. In the present embodiment, the same components as those in FIG.

  That is, the adjustment region 120 of the seal member 119 of the liquid crystal display device 18 shown in FIG. 11 has a shape that is just opposite to the adjustment region 101 shown in FIG. Even in this case, the light incident on the liquid crystal panel 48 from the W color LED 30 can be diffused sufficiently wide by the adjustment region 120 of the seal member 119. Although not shown in the drawing, the adjustment region 108 in FIG. 6 may have a shape that is left and right reversed in the drawing as shown in FIG. Further, although not shown in the drawing, the adjustment regions 112 and 113 in FIG. 8 may have shapes that are opposite in the right and left in the drawing as shown in FIG.

  FIG. 12 is a diagram showing a schematic configuration of another liquid crystal display device 19 according to the present invention.

  The difference between the liquid crystal display device 19 shown in FIG. 12 and the liquid crystal display device 10 shown in FIG. 2 is that the shape of the seal member 121 of the liquid crystal panel 49 is different. In the present embodiment, the same components as those in FIG.

  That is, the adjustment region 122 of the seal member 121 of the liquid crystal display device 19 shown in FIG. 12 has a shape that is just opposite to the adjustment region 104 shown in FIG. Even in this case, the light incident on the liquid crystal panel 49 from the W color LED 30 can be diffused sufficiently wide by the adjustment region 122 of the seal member 121. Although not shown in the drawing, the adjustment region 110 in FIG. 7 may have a left and right shape reversed in the drawing as shown in FIG. Further, although not shown in the drawing, the adjustment regions 115 and 116 in FIG. 9 may have shapes that are opposite in the right and left in the drawing as shown in FIG.

  FIG. 13 is a diagram showing a schematic configuration of another liquid crystal display device 20 according to the present invention.

  The difference between the liquid crystal display device 20 shown in FIG. 13 and the liquid crystal display device 10 shown in FIG. 2 is that the shape of the seal member 123 of the liquid crystal panel 50 is different. In the present embodiment, the same components as those in FIG.

  In FIG. 13, a point A indicates the middle point in the vertical direction of the effective display area 206, a point B indicates the end of the adjustment area 124, a point C indicates the lower end of the effective display area 206, and a point D indicates the W color LED 30. The point E indicates the lower end of the W color LED 30, and the point F indicates the intersection of the perpendicular from the W color LED 30 and the effective display area 206. Further, the angle ADC is the angle T, the angle FEB is the angle P, and the haze value (%) of the effective display area 206 is H. Further, the distance of the line segment AC is the distance X, the distance of the line segment AD is the distance Y, the distance of the line segment AB is the distance Z, and the distance of the line segment DE is the distance L.

  FIG. 15 is a diagram illustrating an example of directivity characteristics of a W color LED that can be used in the present embodiment.

  FIG. 15 shows the relationship between the relative luminous intensity (au) of the W color LED and the radiation angle when the environmental temperature (Ta) is 25 ° C. and the applied voltage (IFP) is 20 mA. In FIG. 15, G indicates the angle at which the relative luminous intensity is 0.5, and P indicates the angle at which the normal line contacts the relative luminous intensity curve from the 90 ° axis on the graph.

  FIG. 16 is a diagram showing the relationship between the width P of the adjustment area in FIG. 13 and the luminance uniformity in the line segment AC (the end of the effective display area).

  In FIG. 16, a curve M1 indicates a case where the distance O (distance of the line segment AC) is 5 mm and the H of the liquid crystal 203 is high, and a curve M2 indicates that the distance O (distance of the line segment AC) is 5 mm and the H of the liquid crystal 203 is low. The curve M3 shows the case where the distance O (distance of the line segment AC) is 10 mm and the H of the liquid crystal 203 is high, and the curve M4 shows the distance O (distance of the line segment AC) of 10 mm and the H of the liquid crystal 203 is low. Shows the case.

  FIG. 17 is a diagram showing the relationship between the width P of the adjustment area in FIG. 13 and the luminance uniformity in the line segment AC (the end of the effective display area).

  In FIG. 17, a curve N1 shows a case where G (angle at which relative luminous intensity becomes 0.5: see FIG. 15) is wide and H of the liquid crystal 203 is high, and a curve N2 shows a case where G is wide and H of the liquid crystal 203 is low. Curve N3 shows a case where G is narrow and H of liquid crystal 203 is high, and curve N4 shows a case where G is narrow and H of liquid crystal 203 is low.

  15 and 16, it is desirable that the width of the adjustment region is wider than 3.0 mm in the case of the cell configuration under the condition of the curve M1 when trying to obtain 70% luminance uniformity in the line segment AC. In the case of the cell configuration under the condition of the curve M3, the width of the adjustment region is desirably wider than 6.2 mm. 15 and 17, when trying to obtain 70% luminance uniformity in the line segment AC, in the case of the cell configuration under the condition of the curve N1, the width of the adjustment region is from 3.0 mm. It is desirable that the width of the adjustment region be wider than 4.0 mm in the case of the cell configuration with the condition of the curve N3.

  FIG. 14 is a diagram showing a schematic configuration of another liquid crystal display device 21 according to the present invention.

  The difference between the liquid crystal display device 21 shown in FIG. 14 and the liquid crystal display device 20 shown in FIG. 13 is that two W-color LEDs 30 and 31 are used, and the seal member 125 of the liquid crystal panel 51 has two types as shown in FIG. The adjustment areas 126 and 127 are arranged. In the present embodiment, the same components as those in FIG.

  The conditions of each adjustment area in FIG. 14 are the same as the conditions shown in FIG. In the case where a plurality of adjustment regions are arranged, it is preferable that the pitch V is arranged so as not to be narrower than twice the distance Q.

  Although the conditions of the adjustment area have been described using FIGS. 13 to 17, as shown in FIGS. 13 and 14, for example, as shown in FIG. In addition, the entire width of the effective area may be used as the adjustment area. Note that w1 corresponds to the distance Y in FIG. 13 obtained from the relationship shown in FIGS. 16 and 17 from the correlation with the emission intensity of the LED, the haze of the sealing agent, the cell size, and the required uniformity. It is the thickness, and w2 is the necessary minimum thickness defined from the cell outer dimensions, and need not be thicker than w1.

  FIG. 18 is a diagram showing a schematic configuration of another liquid crystal display device 22 according to the present invention.

  The difference between the liquid crystal display device 22 shown in FIG. 18 and the liquid crystal display device 10 shown in FIG. 2 is that the light from the W color LED 30 is diffused by the seal pattern 131 provided between the W color LED 30 and the seal member 130. It is. In this embodiment, the same number is attached | subjected to the structure similar to FIG.

  The four sides of the seal member 130 of the liquid crystal panel 52 are formed to have substantially the same thickness (for example, about 0.8 mm). A seal pattern 131 is formed between the W-color LED 30 and the seal member 130 and in the gap between the pair of glass substrates 201 and 202. The seal pattern 131 is composed of four bar-shaped patterns, and is set so that the length gradually increases from the bar-shaped pattern on the W color LED 30 side toward the bar-shaped pattern on the effective display area 206 side. The seal pattern 131 is formed at the same time as the printing of the seal member 131 by the same material as the seal member 130. Therefore, the seal pattern 131 includes the same filler and spacer as those described with reference to FIG.

  The light incident on the seal pattern 131 from the W color LED 30 is diffused sufficiently wide by the filler contained in the seal pattern 131 and enters the effective display area 206 through the seal member 130. 8 does not cause a decrease in luminance and does not cause excessive concentration of luminance in the portion corresponding to the region 7 in FIG. 1, so that luminance unevenness does not occur in the effective display region 206 as a whole. . Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  FIG. 19 is a diagram showing a schematic configuration of another liquid crystal display device 23 according to the present invention.

  The difference between the liquid crystal display device 23 shown in FIG. 19 and the liquid crystal display device 10 shown in FIG. 2 is that light from the W color LED 30 is diffused by another seal pattern 132 provided between the W color LED 30 and the seal member 130. It is a point to make. In this embodiment, the same number is attached | subjected to the structure similar to FIG.

  The four sides of the seal member 130 of the liquid crystal panel 53 are formed to have substantially the same thickness (for example, about 0.8 mm). Another seal pattern 132 is formed between the W-color LED 30 and the seal member 130 and in the gap between the pair of glass substrates 201 and 202. The seal pattern 132 is composed of a random arrangement of thin rod-like patterns. Further, the seal pattern 132 is formed at the same time as the printing of the seal member 130 by the same material as the seal member 130. Therefore, the seal pattern 132 includes the same filler and spacer as those described with reference to FIG.

  The light incident on the seal pattern 132 from the W color LED 30 is diffused sufficiently wide by the filler included in the seal pattern 132 and enters the effective display area 206 through the seal member 130. 8 does not cause a decrease in luminance and does not cause excessive concentration of luminance in the portion corresponding to the region 7 in FIG. 1, so that luminance unevenness does not occur in the effective display region 206 as a whole. . Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  FIG. 20 is a diagram showing a schematic configuration of another liquid crystal display device 24 according to the present invention.

  The difference between the liquid crystal display device 24 shown in FIG. 20 and the liquid crystal display device 10 shown in FIG. 2 is that light from the W color LED 30 is diffused by another seal pattern 133 provided between the W color LED 30 and the seal member 130. It is a point to make. In this embodiment, the same number is attached | subjected to the structure similar to FIG.

  The four sides of the seal member 130 of the liquid crystal panel 54 are formed to have substantially the same thickness (for example, about 0.8 mm). Another seal pattern 133 is formed between the W-color LED 30 and the seal member 130 and in the gap between the pair of glass substrates 201 and 202. The seal pattern 133 is composed of four bent bar-shaped patterns, and is set so that its length gradually increases from the bar-shaped pattern on the W color LED 30 side toward the bar-shaped pattern on the effective display area 206 side. . Further, the seal pattern 133 is formed at the same time as the printing of the seal member 130 by the same material as the seal member 130. Therefore, the seal pattern 133 includes the same filler and spacer as those described with reference to FIG.

  The light incident on the seal pattern 133 from the W color LED 30 is diffused sufficiently wide by the filler contained in the seal pattern 133 and enters the effective display area 206 through the seal member 130. 8 does not cause a decrease in luminance and does not cause excessive concentration of luminance in the portion corresponding to the region 7 in FIG. 1, so that luminance unevenness does not occur in the effective display region 206 as a whole. . Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  FIG. 21 is a diagram showing a schematic configuration of another liquid crystal display device 25 according to the present invention.

  The difference between the liquid crystal display device 25 shown in FIG. 21 and the liquid crystal display device 10 shown in FIG. 2 is that light from the W color LED 30 is diffused by another seal pattern 134 provided between the W color LED 30 and the seal member 130. It is a point to make. In this embodiment, the same number is attached | subjected to the structure similar to FIG.

  The four sides of the seal member 130 of the liquid crystal panel 55 are formed to have substantially the same thickness (for example, about 0.8 mm). Another seal pattern 134 is formed between the W-color LED 30 and the seal member 130 and in the gap between the pair of glass substrates 201 and 202. The seal pattern 134 is composed of four arc-shaped patterns, and is set so that its length gradually increases from the pattern on the W color LED 30 side toward the pattern on the effective display area 206 side. Further, the seal pattern 134 is formed at the same time as the printing of the seal member 130 by the same material as the seal member 130. Therefore, the seal pattern 134 includes the same filler and spacer as those described with reference to FIG.

  The light incident on the seal pattern 134 from the W color LED 30 is diffused sufficiently wide by the filler contained in the seal pattern 134 and is incident on the seal member 130. Therefore, the light in the portions corresponding to the regions 6 and 8 in FIG. The luminance does not decrease and excessive luminance concentration does not occur in a portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  FIG. 22 is a diagram showing a schematic configuration of another liquid crystal display device 26 according to the present invention.

  The difference between the liquid crystal display device 26 shown in FIG. 22 and the liquid crystal display device 10 shown in FIG. 2 is that light from the W color LED 30 is diffused by another seal pattern 135 provided between the W color LED 30 and the seal member 130. It is a point to make. In this embodiment, the same number is attached | subjected to the structure similar to FIG.

  The four sides of the sealing member 130 of the liquid crystal panel 56 are formed to have substantially the same thickness (for example, about 0.8 mm). Another seal pattern 135 is formed between the W-color LED 30 and the seal member 130 and in the gap between the pair of glass substrates 201 and 202. The seal pattern 135 is composed of a plurality of dot patterns arranged at random. Further, the seal pattern 135 is formed at the same time as the printing of the seal member 130 by the same material as the seal member 130. Accordingly, the seal pattern 135 includes the same filler and spacer as those described with reference to FIG.

  The light incident on the seal pattern 135 from the W color LED 30 is diffused sufficiently wide by the filler contained in the seal pattern 135 and is incident on the seal member 130. Therefore, in the portion corresponding to the regions 6 and 8 in FIG. The luminance does not decrease and excessive luminance concentration does not occur in a portion corresponding to the region 7 in FIG. 1, and luminance unevenness does not occur in the effective display region 206 as a whole. Therefore, in the present embodiment, it is possible to efficiently use the light emitted from the W color LED 30.

  Although the seal patterns 131 to 135 have been described with reference to FIGS. 18 to 22, the shape and number of the seal patterns are examples, and are not limited thereto. Therefore, the optimal shape and number can be selected according to the light amount distribution of the W color LED 30 to be used and the shape and size of the effective display area.

It is a figure which shows schematic structure of the conventional liquid crystal display device. 1 is a schematic cross-sectional view of a liquid crystal display device 10 according to the present invention. It is a schematic sectional drawing of the other liquid crystal display device 11 which concerns on this invention. It is a figure which shows an example of the light quantity distribution of LED. It is a schematic sectional drawing of the other liquid crystal display device 12 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 13 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 14 based on this invention. It is a schematic sectional drawing of the other liquid crystal display device 15 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 16 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 17 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 18 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 19 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 20 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 21 which concerns on this invention. It is the figure which showed the relationship between relative luminous intensity and a radiation angle. It is the figure which showed the relationship between the width | variety of an adjustment area | region, and the uniformity of a brightness | luminance. It is the figure which showed the relationship between the width | variety of an adjustment area | region, and the uniformity of a brightness | luminance. It is a schematic sectional drawing of the other liquid crystal display device 22 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 23 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 24 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 25 which concerns on this invention. It is a schematic sectional drawing of the other liquid crystal display device 26 which concerns on this invention.

Explanation of symbols

10-26 Liquid crystal display 30, 31 W color LED
40 to 56 Liquid crystal panel 100, 103, 105, 107, 109, 111, 114, 117, 119, 121, 123, 125, 130 Seal member 101, 104, 106, 108, 110, 112, 113, 115, 116, 118, 120, 122, 124, 126, 127 Adjustment region 131-135 Seal pattern 201, 202 A pair of glass substrates 203 Liquid crystal

Claims (17)

A liquid crystal display device,
A liquid crystal panel having an effective display area for displaying information and sandwiching liquid crystal between a pair of substrates;
A light source for irradiating light from a side surface of the liquid crystal panel;
The liquid crystal is disposed between the pair of substrates around the liquid crystal and has an adjustment region disposed on the light source side of the liquid crystal panel and a peripheral region disposed on the liquid crystal panel other than the light source side. A seal member in which the adjustment region is determined based on the light emission characteristics of the light source in order to diffuse the light emitted from the light source to the effective display region;
A liquid crystal display device comprising:   The liquid crystal display device according to claim 1, wherein a shape of the adjustment region is formed wider than the peripheral region.   2. The liquid crystal display device according to claim 1, wherein the shape of the adjustment region has a kamaboko shape having the light source side as a vertex and the effective display region as a base.   The liquid crystal display device according to claim 1, wherein a shape of the adjustment region has a substantially trapezoidal shape with the light source side as a top side and the effective display region as a bottom side.   2. The liquid crystal display device according to claim 1, wherein the shape of the adjustment region has a kamaboko shape having the light source side as a base and the effective display region as a vertex.   The liquid crystal display device according to claim 1, wherein a shape of the adjustment region has a substantially trapezoidal shape with the light source side as a base and the effective display region as a top side.   The liquid crystal display device according to claim 1, wherein a shape of the adjustment region is the substantially elliptical shape.   The light source includes a plurality of LEDs, and the adjustment region corresponding to each LED has a kamaboko shape having the light source side as a vertex and the effective display region as a base. Liquid crystal display device.   The light source includes a plurality of LEDs, and the adjustment region corresponding to each LED has a substantially trapezoidal shape with the light source side as a top side and the effective display region as a bottom side. Liquid crystal display device.   The light source includes a plurality of LEDs, and the adjustment region corresponding to each LED has a kamaboko shape having the light source side as a base and the effective display region as a vertex. Liquid crystal display device.   The light source includes a plurality of LEDs, and the adjustment region corresponding to each LED has a substantially trapezoidal shape with the light source side as a base and the effective display region as a top. Liquid crystal display device.   The liquid crystal display device according to claim 1, wherein the light source includes a plurality of LEDs, and the adjustment region corresponding to each LED has a substantially elliptical shape.   The liquid crystal display device according to claim 8, wherein the plurality of LEDs are arranged at positions corresponding to one side surface of the effective display area.   The liquid crystal display device according to any one of claims 8 to 12, wherein the plurality of LEDs are respectively arranged at positions corresponding to a plurality of side surfaces of the effective display area. A liquid crystal display device,
A liquid crystal panel having an effective display area for displaying information and sandwiching liquid crystal between a pair of substrates;
A light source for irradiating light from a side surface of the liquid crystal panel;
A sealing member disposed around the liquid crystal for sealing the liquid crystal between the pair of substrates;
A seal pattern disposed between the pair of substrates, between the light source and the seal member, for diffusing light emitted from the light source to the effective display area via the seal member;
A liquid crystal display device comprising:   The liquid crystal display device according to claim 15, wherein the seal pattern includes a plurality of bar-shaped patterns, a plurality of dot-shaped patterns, a plurality of arc-shaped patterns, or a plurality of bent patterns.   The liquid crystal display device according to claim 15, wherein the seal pattern is made of the same material as the seal member.

Images