CN1499263A - Illuminaotr and mfg. method for LCD and diffusibility board - Google Patents

Abstract

A front light (lighting unit) is equipped with the light guide plate 12, an intermediate light guide body 13 arranged along one end surface of the light guide plate 12, and the light emitting element 15 which is arranged on a lengthwise end surface of the intermediate light guide body 13, and extension directions of respective prism grooves 14 formed on one surface side of the light guide plate 12 are set crossing a light incidence surface 12a; and the diffusion sheet 50 is interposed between the light incidence surface 12a of the light guide plate 12 and a projection surface 13k of the intermediate light guide body 13, and the diffusion sheet 50 has its a diffusing body formation surface 51a provided on one surface facing the light incidence surface 12a of the light guide plate 12 and the diffusing body formation surface 51a is varied in diffusion coefficient in accordance with the distance from the light emitting element.

Description

The manufacture method of lighting device and liquid crystal indicator and diffusivity plate

Technical field

The present invention relates to the manufacture method of lighting device and liquid crystal indicator and diffusivity plate, though particularly when the light source of a lamp, also can improve quantity of light emission distributing homogeneity lighting device and utilize the liquid crystal indicator of this lighting device structure, with lighting device in the manufacture method of the diffusivity plate that has.

Background technology

In the past, the unit that in the front light-source of reflection-type liquid-crystal display device, adopts the box body that is fixed together by light source, middle light conductor, light guide plate and with these objects etc. to form with reflectivity inner face.

Figure 20 A is the three-dimensional structure diagram of the liquid crystal indicator of this structure.Figure 20 B is from observing the vertical view of the liquid crystal indicator shown in the observed Figure 20 A of side.The liquid crystal indicator of representing among these figure is formed (for example, with reference to patent documentation 1) by liquid crystal display 120, the front light-source 110 that is provided in these liquid crystal display 120 front face side.Though not expression in its detailed structure view, liquid crystal display 120 is for reflecting the reflective liquid crystal display unit that shows from the light of its front face side incident, clamping has liquid crystal layer between the upper substrate 121 that disposes in opposite directions, infrabasal plate 122, change the state that sees through of light by the orientation state of controlling this liquid crystal layer, thereby show.

Front light-source 110 is made up of flat light guide plate 112, the bar-shaped middle light guide plate 113 that is provided in the side end face 112a of this light guide plate 112, the light-emitting component 115 that is provided in an end face portion of this centre light guide plate 113, at the upper face side of the light guide plate 112 prismatic groove 114 that to be formed with a plurality of cross sections that are parallel to each other be the chock shape.In addition, in order to prevent interference fringe, these prismatic grooves 114 relative light guide plate side end face 112a tilt to some extent.

Like this, above-mentioned front light-source 110 will shine the side end face 112a of light guide plate 112 through middle light guide plate 113 from the light that light-emitting component 115 penetrates and import in the light guide plate 112, the inner face side of these light on the light guide plate 112 that is formed with the rib shape is reflected, thereby change the direction of propagation of light, below the diagram of light guide plate 112, shine towards liquid crystal display 120.

[patent documentation 1]

The flat 10-19213 communique of special hope

Summary of the invention

(the problem to be solved in the present invention)

In portable electric appts such as portable data assistance or portable game machine, the service time of battery, the degree tool easy to use for this equipment had a significant impact, therefore in as the liquid crystal indicator that display part adopted in these equipment, in order to realize the low consumption electrification of front light-source, gradually adopt 1 lamp type front light-source of the such light-emitting component that 1 lamp only is housed 115 of front light-source 110 shown in Figure 20 A.That is, realize the low consumption electrification by omitting light-emitting component.In addition, along with the miniaturization of portable electric appts, the thickness of slab of front light-source 110 is thinned to about 1mm.

But, utilize 1 such lamp type front light-source, can not obtain even and bright illumination on the large tracts of land more than several inches by combination thin light guide panel and 1 lamp type light-emitting component basically.Promptly, front light-source 110 shown in Figure 20 A is like that when a side of middle light conductor 113 is provided with light-emitting component 115, for the light that this light-emitting component 115 is sent evenly is directed on the light conductor, at first must incident light evenly be distributed at the side end face of light guide plate 12 length direction by middle light conductor 113, but make by this centre light conductor 113 and itself to have any problem, so arrive equally distributed ejaculation light in the full range of light guide plate 112 scarcely ever towards the even distribution of the incident light of light guide plate 112.Therefore, under the especially significant situation, go up at the edge part (diagram left side edge portion) of light-emitting component 115 sides of light guide plate 112 and can produce the dark portion 118 of overlooking shown in Figure 20 B for triangle, thus the visibility of reduction liquid crystal indicator.

Also have, if for the slimming of portable electric appts, miniaturization and make light guide plate 112 slimmings, at the light of the internal transmission of light guide plate 112 when the inner face of light guide plate is reflected, leak into the outside of light guide plate 112 easily, the distance of leaving light-emitting component is big more, and the reduction of light quantity is just remarkable more.

Like this, though the requirement as the front light-source of light source is constantly improving to the light-emitting component that uses 1 lamp, still do not realize existing slimming, the front light-source that again can large tracts of land homogeneous and bright ground throw light on.

One of purpose of the present invention is to solve above-mentioned problem, and the lighting device that can prevent to occur at the light guide plate edge part of light-emitting component side the low power consumption of dark portion, the ground illumination of energy large tracts of land homogeneous and bright is provided.

Also have, another object of the present invention is to provide liquid crystal indicator with good display characteristic with above-mentioned lighting device, high brightness.

(means of dealing with problems)

To achieve these goals, the present invention adopts following structure.

The lighting device relevant with the present invention be have light guide plate, be provided in a side end face of this light guide plate middle light conductor, be provided in the lighting device of light-emitting component of end face of the length direction of this centre light conductor, it is characterized in that:

The side end face of the lead-in light of above-mentioned light guide plate is an incidence surface, with the side end face of light conductor in the middle of in opposite directions above-mentioned of the incidence surface of above-mentioned light guide plate for the light of above-mentioned light-emitting component being injected to the exit facet of light guide plate, the reflecting surface of lateral surface with the middle light conductor of this exit facet opposition side for the light in this centre light conductor internal transmission is reflected, there is the diffusivity plate between the exit facet of the incidence surface of above-mentioned light guide plate and above-mentioned middle light conductor, this diffusivity plate and incidence surface above-mentioned light guide plate one side in opposite directions are provided with diffuser and form face, and the coefficient of diffusion that this diffuser forms face changes along with the distance of leaving above-mentioned light-emitting component.

According to the lighting device of said structure, the light guide plate edge part that can occur the light-emitting component side that quantity of light emission reduces in 1 lamp type lighting device is in the past easily supplied with more light, thereby can improve the homogeneity of the quantity of light emission in the light guide plate face.

In detail, the light guide plate edge part that in 1 lamp type lighting device, occurs the light-emitting component side of quantity of light emission reduction easily, become approximate right angle if inject to the incidence surface of the above-mentioned relatively light guide plate of light of this part, just can be transferred to the light guide plate edge part of light-emitting component side.

In order to increase the quantity of light emission of the light guide plate edge part that is transferred to the light-emitting component side, as mentioned above, between the exit facet of the incidence surface of light guide plate and middle light conductor, be provided with the diffusivity plate, increase on the diffuser formation face of this diffusivity plate coefficient of diffusion near the part of light-emitting component, make scattering of light be easy to generate (enhancing diffusivity), thereby increase the ejaculation light that becomes the approximate right angle direction with the incidence surface of above-mentioned light guide plate, improve the light quantity of the light guide plate edge part of light-emitting component side, prevent dark portion.

But, the efficient that can penetrate from other one side side of light guide plate when becoming approximate right angle owing to the light that injects to above-mentioned light guide plate with above-mentioned incidence surface just reduces, by reduce in the above-mentioned diffuser formation face near the part beyond the part of light-emitting component coefficient of diffusion, suppress the generation (weakening diffusivity) of scattered light, can not reduce the efficient that can penetrate from other one side side of light guide plate.

Like this, the quantity of light emission of light guide plate integral body is evenly distributed.

Therefore,, can prevent from dark portion to occur at the light guide plate edge part of light-emitting component side according to lighting device of the present invention, though when light source be 1 lamp, also can be on large tracts of land the illumination of homogeneous and bright ground, realize the low consumption electrification.

Also have, lighting device of the present invention be have light guide plate, be provided in a side end face of this light guide plate middle light conductor, be provided in the lighting device of light-emitting component of end face of the length direction of this centre light conductor, it is characterized in that:

The side end face of the lead-in light of above-mentioned light guide plate be incidence surface, with in opposite directions above-mentioned of the incidence surface of above-mentioned light guide plate in the middle of light conductor the side for the exit facet that the light of above-mentioned light-emitting component injected to light guide plate, with the lateral surface of middle the light conductor of this exit facet opposition side be the reflecting surface that the light in this centre light conductor internal transmission is reflected, the exit facet of the incidence surface of above-mentioned light guide plate or above-mentioned middle light conductor is provided with diffuser and forms face, and the coefficient of diffusion that this diffuser forms face changes along with the distance of leaving above-mentioned light-emitting component.

The lighting device of this structure also can prevent from dark portion to occur at the light guide plate edge part of light-emitting component side, though when light source be 1 lamp, also can be on large tracts of land the illumination of homogeneous and bright ground, realize the low consumption electrification.

In detail, in order to increase the quantity of light emission of the light guide plate edge part that is transferred to the light-emitting component side, as mentioned above, be provided with diffuser formation face at the incidence surface of light guide plate or the exit facet of middle light conductor, increase on this diffuser formation face coefficient of diffusion near the part of light-emitting component, make scattering of light be easy to generate (enhancing diffusivity), thereby increase the ejaculation light that becomes the approximate right angle direction with the incidence surface of above-mentioned light guide plate, improve the light quantity of the light guide plate edge part of light-emitting component side, prevent dark portion.But, because when the light that injects to above-mentioned light guide plate becomes approximate right angle with above-mentioned incidence surface, can just reduce from the efficient of other one side side ejaculation of light guide plate, by reduce in the above-mentioned diffuser formation face near the part beyond the part of light-emitting component coefficient of diffusion, suppress the generation (weakening diffusivity) of scattered light, can not reduce the efficient that can penetrate from other one side side of light guide plate.Like this, the quantity of light emission of light guide plate integral body is evenly distributed.

Also have, in the lighting device of the present invention of above-mentioned any structure, many prismatic grooves that are band shape in the time of can also on the one side side of above-mentioned light guide plate, forming by gently sloping surface portion and angle of inclination greater than facial the overlooking of forming of the steeply inclined of this gently sloping surface portion, the extending direction of above-mentioned each prismatic groove intersects with above-mentioned incidence surface, the light that penetrates from above-mentioned light-emitting component imports light guide plate inside by light conductor in the middle of above-mentioned from the incidence surface of above-mentioned light guide plate, in other one side side ejaculation from above-mentioned light guide plate of the light of above-mentioned light guide plate internal transmission.

Shown in this lighting device, if the extending direction of each prismatic groove intersects with above-mentioned incidence surface, though (in other words the direction of light that injects to light guide plate from above-mentioned middle light conductor becomes vertical angle with the extending direction of above-mentioned prismatic groove, the direction of light that injects to light guide plate is the vergence direction of extending direction of the incidence surface of relative light guide plate) time, can be effectively penetrate from other one side side of light guide plate, but for the light guide plate edge part that occurs the light-emitting component side of dark portion in the lighting device of 1 lamp type easily, if the light that injects to this part with respect to the incidence surface of above-mentioned light guide plate be the approximate right angle direction (in other words, the direction of light that injects to light guide plate is the acute angle direction with respect to the extending direction of above-mentioned prismatic groove), just can be transferred to the light guide plate edge part of light-emitting component side.

Here, in order to increase the quantity of light emission of the light guide plate edge part that is transferred to the light-emitting component side, as mentioned above, between the exit facet of the incidence surface of light guide plate and middle light conductor, be provided with and form the diffusivity plate that diffuser forms face, perhaps form diffuser formation face at the incidence surface of light guide plate or the exit facet of middle light conductor, increase on the above-mentioned diffuser formation face coefficient of diffusion near the part of light-emitting component, make scattering of light be easy to generate (enhancing diffusivity), thereby increase the ejaculation light that becomes the approximate right angle direction with the incidence surface of above-mentioned light guide plate, improve the light quantity of the light guide plate edge part of light-emitting component side, prevent dark portion.But, because when the light that injects to above-mentioned light guide plate becomes approximate right angle with above-mentioned incidence surface, can just reduce from the efficient of other one side side ejaculation of light guide plate, by reducing in the above-mentioned diffuser formation face near the coefficient of diffusion of the part beyond the part of light-emitting component, the generation (weakening diffusivity) of inhibition scattered light, can increase with ejaculation light, not reduce the efficient that can penetrate from other one side side of light guide plate perpendicular to the extending direction of above-mentioned prismatic groove.Like this, the quantity of light emission of light guide plate integral body is evenly distributed.

In the lighting device of the present invention, above-mentioned diffuser forms the coefficient of diffusion of face and can represent with Haze.At this moment on the above-mentioned diffuser formation face, preferably the Haze value of light-emitting component side is greater than the Haze value of opposition side, can prevent from like this dark portion to occur, and can prevent to inject to the efficient that near the light the light guide plate edge part with light-emitting component side opposition side penetrates from other side of light guide plate and occur reducing at the light guide plate edge part of light-emitting component side.

The Haze here is the transmissivity yardstick of optical field, the value of representing with % after divided by full light transmittance for the diffused transmission rate.When the incidence surface of above-mentioned light guide plate and above-mentioned in the middle of when being provided with the diffusivity plate between the outgoing plane of light conductor, the value of above-mentioned Haze is big more, and the light that penetrates from the middle light conductor of the one side side that is configured in the light diffusing plate passes above-mentioned diffusivity plate, the scattered light (diffused transmission light) of the another side side of this light diffusing plate just strong more (many).The Haze value is more little, and scattered light is weak more (lacking) just.Also have, when the incidence surface of above-mentioned light guide plate or above-mentioned in the middle of the outgoing plane of light conductor when being provided with diffuser and forming face, the value of above-mentioned Haze is big more, and the light that forms the one side side incident of face from above-mentioned diffuser passes the scattered light (diffused transmission light) just strong more (many) that this diffuser forms face, forms the another side side of face at this diffuser.The Haze value is more little, and scattered light is weak more (lacking) just.

Also have, in the lighting device of the present invention, above-mentioned diffuser forms the coefficient of diffusion of face and represents that with Haze on the above-mentioned diffuser formation face, the value of Haze also can be towards reducing in turn with light-emitting component side opposition side.

Also have, in the lighting device of the present invention, also can be formed with a large amount of micro concavo-convexes on the above-mentioned diffuser formation face.Like this when on diffuser formation face, being formed with a large amount of micro concavo-convex, as the method that changes coefficient of diffusion, the size (diameter or the degree of depth or height etc.) of passing through to adjust protuberance and recess, shape, distribution density etc., can on diffuser formation face, obtain required diffusivity and distribute.

Also have, in the lighting device of the present invention, the formation of the reflecting surface of above-mentioned middle light conductor preferably makes near the light intensity of the intensity of light reflected light-emitting component greater than near the opposite side sub reflector of portion above-mentioned light-emitting component.

Like this, lighting device of the present invention as mentioned above, though form the coefficient of diffusion of face by the diffuser that increases the light-emitting component side, the incidence surface that makes the above-mentioned relatively light guide plate of light of the light guide plate edge part that injects to the light-emitting component side is approximate right angle direction (or the direction of light that injects to light guide plate is the acute angle direction with respect to the extending direction of above-mentioned prismatic groove), but can allow to like this occur reducing from the efficient that other side of light guide plate penetrates, so increased near the reflecting surface intensity of light reflected of the middle luminophor light-emitting component, so, the diffuser that incides the light-emitting component side forms the incident light quantity increase of face, incident light sees through diffuser and forms the amount of scattered light that face produced and also increase, thereby can prevent from the light (illumination light) that other one side side of light guide plate penetrates diminish (weak).

On the other hand, because it is little with the coefficient of diffusion of light-emitting component side opposition side, the incidence surface of the above-mentioned relatively light guide plate of light of light guide plate edge part that injects to the opposition side of light-emitting component side is the acute angle extending direction of above-mentioned prismatic groove (or perpendicular to), from light guide plate other the one side side ejaculation efficient height, so also can not increase near the reflecting surface intensity of light reflected of the middle light conductor of portion light-emitting component.

Like this, make and evenly to distribute from the illumination light quantity of the ejaculation of other one side side of light guide plate.

Also have, in the lighting device of the present invention, in the middle of above-mentioned the reflecting surface intensity of light reflected of light conductor preferably towards with above-mentioned light-emitting component near portion's opposition side part reduce in turn, for example, the reflection characteristic of the reflecting surface of light conductor distributes and can satisfy following relation in the middle of above-mentioned: near the portion's intensity of light reflected above-mentioned light-emitting component＞with light-emitting component near portion's adjacent part (the reflecting surface central authorities of middle light conductor) intensity of light reflected＞with above-mentioned light-emitting component near the light intensity of portion's opposite side sub reflector.

As mentioned above, in the lighting device of the present invention, if increase near the reflecting surface intensity of light reflected of the middle light conductor of portion light-emitting component, the amount of scattered light that sees through the diffuser formation face of light-emitting component side increases, the light quantity that penetrates from the light guide plate edge part of light-emitting component side also increases, but also there is the light that injects to the light guide plate edge part adjacent part (light guide plate central portion) of light-emitting component side in this moment above-mentioned scattered light (scattered light of light-emitting component side), therefore as mentioned above, by reducing the reflecting surface central portion intensity of light reflected at middle light conductor, the light quantity that can prevent to inject to the light guide plate central portion is too much.

Like this, make and evenly to distribute from the illumination light quantity of the ejaculation of other one side side of light guide plate.

Also have, in the lighting device of the present invention, being provided with by a plurality of cross sections at the reflecting surface of above-mentioned light guide plate is the faceted pebble that the prismatic groove of chock shape forms, and also can change the spacing and/or the degree of depth of the groove of above-mentioned chock shaped cross.

According to the lighting device of this structure, the spacing and/or the degree of depth of the groove by changing above-mentioned chock shaped cross, can make above-mentioned in the middle of the reflecting surface of light conductor have required reflection characteristic and distribute.Also have, also can on this faceted pebble, be provided with reflectance coating.

On the reflecting surface of above-mentioned light guide plate, also can be provided with by a plurality of small concavo-convex small male and fomale(M﹠F)s that form, be the faceted pebble that the prismatic groove of chock shape forms to replace by a plurality of cross sections.Also have, also can be provided with reflectance coating on the surface of this small male and fomale(M﹠F).

Also have, in the lighting device of the present invention, the incidence surface of above-mentioned light guide plate or above-mentioned in the middle of the diffuser that is provided with on the outgoing plane of light conductor form face also can by to the incidence surface of above-mentioned light guide plate or above-mentioned in the middle of the outgoing plane of light conductor carry out blasting treatment and form, and also can change the roughness of blasting treatment along with the distance of leaving above-mentioned light-emitting component.

Also have, in the lighting device of the present invention, the incidence surface of above-mentioned light guide plate or above-mentioned in the middle of when diffuser being set on the outgoing plane of light conductor and forming face, in order to obtain and the identical effect of above-mentioned diffusivity plate, also can the incidence surface of above-mentioned light guide plate or above-mentioned in the middle of form concavo-convex on the outgoing plane of light conductor and control concavo-convex shape and spacing, perhaps also can the incidence surface of above-mentioned light guide plate or above-mentioned in the middle of coat particulate on the outgoing plane of light conductor and control the shape and the spacing of particulate.

Then, liquid crystal indicator of the present invention is characterised in that lighting device of the present invention with above-mentioned any structure and the liquid crystal display that utilizes this lighting device to throw light on.

Liquid crystal indicator of the present invention is owing to have lighting device of the present invention, when even the light-emitting component of lighting device is 1 lamp, also has good brightness uniformity, therefore have good demonstration visibility, thereby can obtain the liquid crystal indicator with good display characteristics, low power consumption of high brightness.

Lighting device of the present invention can be used as the front light-source device that above-mentioned liquid crystal display is shone from face side.

Also have, lighting device of the present invention also can be used as the backlight arrangement that above-mentioned liquid crystal display is shone from rear side.

The diffusivity plate that has in the lighting device of the present invention can form a large amount of micro concavo-convexes through methods such as sandblast, corrosion by light transmission plates such as resin film, glass, plastics and also wait and obtain required coefficient of diffusion distribution, but preferably adopt diffusivity board fabrication method of the present invention as described below from mass-produced angle by size (diameter or the degree of depth or height etc.), shape, the distribution density of adjusting formed protuberance and recess.

The manufacture method of diffusivity plate of the present invention is to be used to make from the light diffusion of light source and to the manufacture method of the diffusivity plate that is shown the lighting device that face (illuminated zone) throws light on, it is characterized in that: utilize to have a pair roller of configuration in opposite directions, the side face of one of them roll of above-mentioned roll is provided with a large amount of micro concavo-convexes and forms the manufacturing installation that is provided with the processing roll that duplicates mould in shape and/or distribution density that the fabric width direction of above-mentioned roll changes micro concavo-convex, the above-mentioned a pair roller of driven in rotation, between this a pair roller, supply with plate body continuously, when this plate body is pressed in the duplicating mould of above-mentioned processing roll when the sense of rotation of above-mentioned a pair roller is pulled out on the one side of this plate body and heats simultaneously, thereby the diffuser that has changed coefficient of diffusion on the fabric width direction that is formed on this plate body on the one side of above-mentioned plate body forms face.

In the manufacture method of the diffusivity plate of the present invention of said structure, behind the above-mentioned diffuser formation face of formation, this plate body is contacted with cooling-part on the one side of above-mentioned plate body, cool off.

Also have, the manufacture method of diffusivity plate of the present invention is to be used to make from the light diffusion of light source and to the manufacture method of the diffusivity plate that is shown the lighting device that face (illuminated zone) throws light on, it is characterized in that: utilize to have a pair roller of configuration in opposite directions, the side face of one of them roll of above-mentioned roll is provided with a large amount of micro concavo-convexes and forms the manufacturing installation that is provided with the processing roll that duplicates mould in shape and/or distribution density that the fabric width direction of above-mentioned roll changes micro concavo-convex, the above-mentioned a pair roller of driven in rotation, between this a pair roller, supply with photo-hardening type resin liquid continuously, make it to become plate body and contacting with the duplicating mould of above-mentioned processing roll at above-mentioned photo-hardening type resin liquid when the sense of rotation of above-mentioned a pair roller is pulled out, thereby the diffuser that has changed coefficient of diffusion on the fabric width direction that is formed on this plate body on the one side of above-mentioned plate body forms face.

In the manufacture method of the diffusivity plate of the present invention of said structure, above-mentioned photo-hardening type resin liquid with the contacted state of duplicating mould of above-mentioned processing roll or one side at above-mentioned plate body on form above-mentioned diffuser formation face after, preferably carry out rayed, above-mentioned photo-hardening type resin liquid or above-mentioned plate body are hardened.

Also have, the manufacture method of diffusivity plate of the present invention is to be used to make from the light diffusion of light source and to the manufacture method of the diffusivity plate that is shown the lighting device that face (illuminated zone) throws light on, it is characterized in that: utilize coating parts with coating photo-hardening type resin liquid, roll that can driven in rotation, the side face of this roll is provided with a large amount of micro concavo-convexes and forms the manufacturing installation that is provided with the processing roll that duplicates mould in shape and/or distribution density that the fabric width direction of above-mentioned roll changes micro concavo-convex

Utilize above-mentioned coating parts at the surface coated photo-hardening type resin liquid of plate-like substrate and after forming photo-hardening type resin bed, the duplicating mould of the above-mentioned processing roll that rotation is driven is pressed in the surface of above-mentioned photo-hardening type resin bed, forms face thereby be formed on the diffuser that has changed coefficient of diffusion on the fabric width direction of above-mentioned plate-like substrate on the surface of above-mentioned photo-hardening type resin bed.

The manufacture method of the diffusivity plate of the present invention of said structure is characterised in that: the state of the duplicating mould of above-mentioned processing roll or after the surface of above-mentioned photo-hardening type resin forms above-mentioned diffuser formation face above-mentioned photo-hardening type is resin laminated, carry out rayed, above-mentioned photo-hardening type resin bed is hardened.

Also have, the manufacture method of diffusivity plate of the present invention is to be used to make from the light diffusion of light source and to the manufacture method of the diffusivity plate that is shown the lighting device that face (illuminated zone) throws light on, it is characterized in that: thereby when the printing ink formation ink lay that the one side of plate-like substrate coating light transmission particulate mixes with bonding agent, change the shape of above-mentioned light transmission particulate along the fabric width direction of plate-like substrate, in distribution density and the refractive index more than any one, form face thereby be formed on the diffuser that has changed coefficient of diffusion on the fabric width direction of above-mentioned plate-like substrate on the surface of above-mentioned ink lay.

Also have, the manufacture method of diffusivity plate of the present invention is to be used to make from the light diffusion of light source and to the manufacture method of the diffusivity plate that is shown the lighting device that face (illuminated zone) throws light on, it is characterized in that: utilize to have a pair of mould of configuration in opposite directions, in above-mentioned a pair of mould, be provided with a large amount of micro concavo-convexes at least one mould and change the manufacturing installation that its shape and/or distribution density form in fabric width direction (the fabric width direction of regulation), the plate body material of heating and melting state is pressed into above-mentioned a pair of mould and shaping, thereby is formed on the diffuser formation face that has changed coefficient of diffusion on the fabric width direction (the fabric width direction of regulation) in the one side at least of above-mentioned plate body.

Above-mentioned each the manufacture method of diffusivity plate of the present invention can high-efficiency and continuous production be used for the diffusivity plate of lighting device of the present invention, can realize the cost degradation of diffusivity plate.

Description of drawings

Fig. 1 is the three-dimensional structure diagram of the liquid crystal indicator of the 1st embodiment of the present invention.

Fig. 2 is the plan structure figure of liquid crystal indicator shown in Figure 1.

Fig. 3 is the III-III line sectional view of liquid crystal indicator shown in Figure 2.

Fig. 4 is near the incidence surface of light guide plate shown in Figure 2, the plane structure chart of the amplification of diffusivity plate and middle light conductor.

Fig. 5 is the partial cross section figure of front light-source shown in Figure 1.

Fig. 6 is the plane structure chart after the amplification of pixel group of liquid crystal display shown in Figure 2.

Fig. 7 is the plane structure chart after the amplification of pixel of active array type liquid crystal display.

Fig. 8 is the sectional view of the VIII-VIII line of Fig. 7.

Fig. 9 represents other example of the diffuser plate that liquid crystal indicator possessed of embodiment.

Figure 10 is the general structural drawing of diffusivity board manufacturing apparatus that expression is applicable to manufacture method the 1st example of diffusivity plate of the present invention.

The stereographic map of the processing roll that Figure 11 is possessed for the diffusivity board manufacturing apparatus of Figure 10.

Figure 12 is that expression utilizes the duplicating mould of processing roll to form the figure of the plate body of micro concavo-convex.

Figure 13 is the general structural drawing of diffusivity board manufacturing apparatus that expression is applicable to manufacture method the 2nd example of diffusivity plate of the present invention.

Figure 14 is the general structural drawing of diffusivity board manufacturing apparatus that expression is applicable to manufacture method the 3rd example of diffusivity plate of the present invention.

Figure 15 is the general structural drawing of diffusivity board manufacturing apparatus that expression is applicable to manufacture method the 4th example of diffusivity plate of the present invention.

Figure 16 is the figure of expression from the middle light conductor relevant with present embodiment of lateral surface observation.

Figure 17 is the general structural drawing of diffusivity board manufacturing apparatus that expression is applicable to manufacture method the 5th example of diffusivity plate of the present invention.

Figure 18 is the curve map of variation of Haze value of the diffusivity plate that front light-source possessed of expression embodiment.

Figure 19 is the curve map that the emitting brightness of the middle light conductor that front light-source possessed of expression embodiment distributes.

Figure 20 A is the stereographic map of the liquid crystal indicator of existing structure, and Figure 20 B is the vertical view of the front light-source shown in Figure 20 A.

Symbol description:

10-front light-source (lighting device); 20-liquid crystal display (illuminated thing); The 12-light guide plate; 12a-side end face (incidence surface, a side end face); Below the 12b-(outgoing plane, other one side); Above the 12c-(reflecting surface, simultaneously); 12d-side end face (terminal surface, other side end face); The 12g-edge surface; The 12h-edge surface; Light conductor in the middle of the 13-; The 13a-faceted pebble; 13b-chock shape groove; 13b1,13b2-inclined-plane; The 13g-end face; The 13h-end face; 14-prismatic groove; 14a-gently sloping surface portion; 14b-steeply inclined face; The 14d-top; The 15-light-emitting component; The 17-reflectance coating; The 20-liquid crystal display; θ ₁The angle of inclination of-gently sloping surface portion; θ ₂--the angle of inclination of steeply inclined face; The degree of depth of d-prismatic groove; The spacing of P-prismatic groove; P ₃The spacing of the groove of-chock shape; The extended line of the edge surface of the light-emitting component side of L-light guide plate; 50,60-diffusivity plate; 51a, 61a-diffuser form face; The 52-micro concavo-convex; Near the portion A1-light-emitting component; Light conductor reflecting surface central portion in the middle of the B1-; Near the opposite part of the portion C1-light-emitting component; 71,81,101-processing roll (roll); 73-cools off roll (cooling-part); 74 plates (cooling-part); 71a, 81a, 101a side face; 71b-duplicates mould; 76,104a-plate body; 80a-photo-hardening type resin bed; 84a UV (ultraviolet light) lamp (light irradiation unit); The 86-plate-like substrate; The 90a-ink lay; 104a-photo-hardening type resin liquid.

Embodiment

Embodiments of the present invention are described with reference to the accompanying drawings.

(the 1st embodiment)

[one-piece construction of liquid crystal watch showing device]

Fig. 1 is the three-dimensional structure diagram of the liquid crystal indicator of the 1st embodiment of the present invention.Fig. 2 is the plan structure figure of liquid crystal indicator shown in Figure 1.Fig. 3 is the III-III line sectional view of liquid crystal indicator shown in Figure 2.The liquid crystal indicator of present embodiment is made up of front light-source (lighting device) 10, the reflective liquid crystal display unit 20 that is configured in its rear side (diagram below side) as shown in Figure 1 to Figure 3.

As shown in Figure 1, the middle light conductor 13 that sets by the transparent light guide plate 12 of substantially planar, along its side end face (side end face) 12a of front light-source 10, be provided in this centre light conductor 13 an end face 13g of length direction on the side of light-emitting component 15, the side end face 12a that is provided in light guide plate 12 and middle light conductor 13 between diffusivity plate 50, from middle light conductor 13 sides cover side end, diffusivity plate 50, the middle light conductor 13 of these light guide plate 12, the box body (occulter) 19 of light-emitting component 15 is formed.The end of the side that is equipped with light-emitting component 15 in the end of the length direction of this centre light conductor 13 forms its length greater than in the length along the length direction of the side end face 12a of light conductor 12, and the edge part 12g of the end face 13g of middle light conductor 13 and the light-emitting component side of light guide plate 12 is not in same plane.Also have, the end of light-emitting component 15 sides in the end of the length direction of diffusivity plate 50 also forms its length greater than in the length along the length direction of the side end face 12a of light conductor 12.

That is, in the front light-source 10 relevant with present embodiment, light-emitting component 15 is formed light source with middle light conductor 13, and the side end face 12a of light guide plate 12 is the incidence surface of light guide plate.Also have, as shown in Figure 2, in the exterior side of light guide plate 12 (diagram upper face side), be equipped with a plurality of prismatic grooves 14 that tilt with inclined angle alpha with respect to incidence surface 12a.Also have, the symbol 12d among Fig. 1 and Fig. 2 is the side end face (terminal surface) of the incidence surface 12a opposition side of light conductor 12.

Liquid crystal display 20 is made up of the upper substrate 21 and the infrabasal plate 22 of configuration in opposite directions.The rectangular area 20D that dotted line among Fig. 1 is represented is the viewing area of liquid crystal display 20, also has, and as shown in Figure 2, pixel 20c is in array-like arrangement in the 20D of viewing area.

The liquid crystal indicator of said structure disposes light guide plate 12 on the 20D of the viewing area (illuminated zone) of liquid crystal display 20, can see through the demonstration that this light guide plate 12 is seen liquid crystal display 20.Also have, in the dark place that does not have external light, then lighting elements 15, make the light that penetrates from light-emitting component 15 by the incidence surface 12a importing light guide plate inside of middle light conductor 13 from light guide plate 12, (other one side) 12b side penetrates towards liquid crystal display 20, liquid crystal display 20 is thrown light in this light guide plate internal transmission and below the diagram of light guide plate 12 to make these light.

Then, describe the structure of various piece of the liquid crystal indicator of present embodiment in detail with reference to accompanying drawing.

[front light-source]

The light guide plate 12 of front light-source 10 is the tabular material, is made of transparent acrylic resin etc., and the viewing area (illuminated zone) that is configured in liquid crystal display 20 is gone up and will be injected to liquid crystal display 20 from following 12b side from the light that light-emitting component 15 penetrates.Shown in the partial cross section figure of Fig. 3, above the diagram of light guide plate 12 (simultaneously, in other words, the opposite sides of liquid crystal display 20 sides) for being the reflecting surface 12c that banded many prismatic grooves that are parallel to each other 14 form when overlooking, following (with the liquid crystal display 20 forward surfaces) 12b of diagram is for penetrating the outgoing plane of the illumination light that liquid crystal display 20 is thrown light on.

Prismatic groove 14 is made up of a pair of inclined plane part that the reference field S with respect to reflecting surface 12c is formed slopely, the longitudinal section is the chock shape, one of them of these inclined plane parts is the 14a of gently sloping surface portion, and another is the facial 14b of steeply inclined with angle of inclination steeper than the 14a of this gently sloping surface portion.Also have, as Fig. 1 and shown in Figure 2, prismatic groove 14 is formed slopely, and its extending direction intersects with the incidence surface 12a of light guide plate 12.Like this, in Fig. 3, the facial 14b of steeply inclined of the light that transmits to the left from the right side in light guide plate 12 inside (from the light of incidence surface lateral end face side transmission) the face 12c that is reflected reflexes to outgoing plane 12b, and penetrates towards the liquid crystal display 20 of the rear side that is configured in light guide plate 12.

Also have, in this front light-source 10, the tilt angle theta of the 14a of gently sloping surface portion shown in Figure 3 ₁Reference field S with respect to reflecting surface 12c is in the scope below 5 ° more than 1 °, the tilt angle theta of the steep 14b of gently sloping surface portion ₂Be in the scope below 45 ° more than 41 °.By being in this scope, the light of transmission in 12 of light guide plate can being injected to liquid crystal display 20 effectively, thereby constitute the liquid crystal indicator of the demonstration that can become clear.Tilt angle theta as the 14a of gently sloping surface portion ₁Scope less than 1 ° the time, the mean flow rate of front light-source reduces, during greater than 5 ° then the quantity of light emission in the light guide plate face can not realize homogenising.Also have, when the tilt angle theta of the steep gently sloping surface 14b of portion ₂Less than 41 ° and during greater than 45 °, by the increase that departs between the normal direction of the transmission direction of the light of the facial 14b reflection of steeply inclined and outgoing plane 12b, light quantity (being the brightness of the front light-source 10) reduction of penetrating from outgoing plane 12b is so should avoid.The reference field S of reflecting surface 12c is the face that comprises the top 14d between the adjacent prismatic groove 14,14 of light guide plate 12.

Also have, in the front light-source 10 of this enforcement state, the spacing P of prismatic groove 14 (interval of the top 14d of prismatic groove 14 or the interval at top, the end) is invariable in the reflecting surface 12c of light guide plate face.In addition, in the front light-source 10 of present embodiment, the depth d of prismatic groove 14 (distance at the top, the end of reference field S and prismatic groove 14) is also invariable in the reflecting surface 12c of light guide plate face.

Also have, the spacing P of prismatic groove 14 and depth d might not be invariable in the face of reflecting surface 12c, change these numerical value and form prismatic groove 14 and also do not exceed technical scope of the present invention.Also have, change the tilt angle theta of prismatic groove 14 respectively ₁And θ ₂Form prismatic groove 14 and also do not exceed technical scope of the present invention.

Also have, as shown in Figure 2, the preferably feasible inclined angle alpha by the prismatic groove 14 that angle determined between prismatic groove 14 and the incidence surface 12a of the formation of prismatic groove 14 is in above 0 ° of scope less than 15 °.Also have, it is then better that above-mentioned inclined angle alpha is in more than 6.5 ° the scope below 8.5 °, if be in this scope, then can access and be difficult to produce the Moire fringe decorative pattern, have a front light-source of good ejaculation optical uniformity simultaneously.

Except acrylic resin, can also adopt transparent resin material such as polycarbonate resin, epoxy resin or glass etc. as the material that constitutes light guide plate 12.

Also have because the quantity of light emission that the thickness of slab of light guide plate 12 is big more, light guide plate is whole just more can homogenising, so thickness of slab be preferably more than the 0.8mm, if more than the 1.0mm then better.Also have, if thickness of slab when to be 1.2mm above, its brightness and thickness of slab are that the situation of 1.0mm～1.5mm changes not quite, and from the slimming angle consideration of front light-source, the upper limit of thickness of slab can be 1.5mm.

Middle light conductor 13 is the hyalomere material along the quadrangular shape of the incidence surface 12a of light conductor 12.Surpass to prolong to the light-emitting component side along the length of the middle light conductor of the direction of the incidence surface of light guide plate 12 and form along the length of the direction of the incidence surface 12a of light guide plate 12, promptly, it is side-prominent to light-emitting component to surpass light guide plate 12, and light-emitting component 15 is provided on the end face 13g of this outstanding side.

Fig. 4 is near the incidence surface 12a of light guide plate 12, the plane structure chart of the amplification of diffusivity plate 50 and middle light conductor 13.As Fig. 1 and shown in Figure 4, the side of the middle light conductor 13 relative with the incidence surface 12a of light guide plate 12 is to be used for the light that light-emitting component 15 penetrates is injected to outgoing plane 13k on the light guide plate 12, with the lateral surface 13j of this outgoing plane 13k opposition side reflecting surface for the light in the internal transmission of middle light conductor 13 is reflected.

Also have, as shown in Figure 4, it is the faceted pebble 13a that is many groove 13b formation that are parallel to each other of chock shape when overlooking (xsect) that the lateral surface 13j of middle light conductor 13 goes up, the light that light-emitting component 15 penetrates, is subjected to reflecting the back at the groove 13b of chock shape inner face and penetrates to light guide plate 12 sides to the length direction transmission of middle light conductor 13 in middle light conductor 13 inside.The groove 13b of chock shape has and is used for catoptrical a pair of inclined-plane 13b1,13b2.

The end face 13g of the light-emitting component side of faceted pebble 13a and middle light conductor 13 is separated with distance.If be positioned at extended line L than the edge surface 12g of the light-emitting component side of light guide plate 12 extend in the middle of extended line L during the lateral surface 13j of light conductor 13 more be-position by the light-emitting component side, the opposition side that is positioned at the light-emitting component side is+position, so the formation starting position M of the light-emitting component side of this faceted pebble 13a be preferably-1mm is above+the following scope of 0.5mm.

Also have, also can whole of the lateral surface 13j of middle light conductor 13, promptly, formation is made up of the metallic film of high reflectances such as A1 or Ag on the formed part of faceted pebble 13a of lateral surface 13j and the non-rib 13c of portion that does not form faceted pebble 13a between faceted pebble 13a and the light-emitting component 15 reflectance coating 17.Improve the reflectivity of faceted pebble 13a by this reflectance coating 17, increase, increase from incidence surface 12a quantity of incident light in light guide plate 12 towards the light quantity that penetrates with faceted pebble 13a outgoing plane 13k direction in opposite directions.

Middle light conductor 13 can also adopt transparent resin material such as polycarbonate resin, epoxy resin or glass etc. except acrylic resin.Also have,, do not limit type, can adopt White LED (Light EmittingDiode) or organic EL etc. as long as light-emitting component 15 can be provided in the end face portion of middle light conductor 13.

As shown in Figures 1 and 2, diffusion template 50 is between the outgoing plane 13k of the incidence surface 12a of above-mentioned light guide plate 12 and middle light conductor 13.Diffusivity plate 50 and incidence surface 12a light guide plate 12 one side in opposite directions are provided with diffuser and form face 51a.Diffuser forms a large amount of micro concavo-convexes 52 that are formed with on the face 51a as shown in Figure 4.

The coefficient of diffusion that diffuser forms face 51a changes along with the distance of leaving above-mentioned light-emitting component 15.Diffuser forms the coefficient of diffusion of face 51a and represents with Haze.

Because above-mentioned reason, the coefficient of diffusion of this diffuser formation face 51a is distributed as the Haze value and reduces in turn towards the direction with light-emitting component side opposition side.

Form a large amount of micro concavo-convexes through sandblast, corrosion or method described later on the one side of the light transmission plate that this diffusivity plate 50 is made up of resin film, glass, plastics etc., wait and obtain required coefficient of diffusion distribution by size (diameter or the degree of depth or height etc.), shape, the distribution density of adjusting formed protuberance and recess simultaneously.For the Haze value is reduced in turn towards the direction with light-emitting component side opposition side, for example, the height that the diffusivity of present embodiment forms the raised part of face 51a reduces in turn towards the direction with light-emitting component side opposition side.

Because above-mentioned reason, as shown in Figure 4, the structure of the lateral surface 13j of middle light conductor 13 make with light-emitting component near adjacent part (the reflecting surface central portion of middle light conductor) the B1 institute intensity of light reflected of the A1 of portion less than near the A1 of portion institute intensity of light reflected above-mentioned light-emitting component, simultaneously less than with above-mentioned light-emitting component near the A1 of portion opposition side part C1 institute intensity of light reflected.That is, have in the reflecting surface intensity of light reflected and begin in turn (beginning in turn) near the side light-emitting component and distribute for large, medium and small reflection characteristic from the left side of Fig. 4.

In the present embodiment, the cross section that is provided with by change lateral surface 13j is the groove 13b and (the interval P of the interval between the 13b of chock shape ₃) and/or the degree of depth make above-mentioned in the middle of the lateral surface 13j of light conductor obtain reflection characteristic and distribute.

Specifically, have following relation: the cross section of the A1 of portion is that the cross section of reflecting surface central portion B1 of the degree of depth＜middle light conductor of the groove 13b of chock shape is that the cross section of the degree of depth＜opposition side part C1 of the groove 13b of chock shape is the degree of depth of the groove 13b of chock shape near the light-emitting component.

Also have, 2 formed angle a of inclined-plane 13b1,13b2 that constitute the groove 13b of chock shape are preferably below above 115 degree of 100 degree.The angle b of inclined-plane 13b1 is preferably below above 40 degree of 32.5 degree.Also have, the angle b of these inclined-planes 13b1 and the angle c of inclined-plane 13b2 can be identical, also can be inequality.

Also have, as shown in Figure 1, middle light conductor 13 sides of front light-source 10 are coated with box body 19.Fig. 5 is the cross section structure figure that comprises the front light-source 10 of box body 19.As shown in Figure 5, can form the reflectance coating 19a that forms by the metallic film of high reflectances such as Al or Ag in the inner face side of box body 19.Utilize this reflectance coating 19a reflection from the light that the side end of middle light conductor 13 and diffusivity plate 50 and light guide plate 12 leaks laterally, make its incide once more in the middle of light conductor 13 and obtain utilizing as illumination light.

In the front light-source 10 of present embodiment, between the outgoing plane 13k of the incidence surface 12a of light guide plate 12 and middle light conductor 13, be provided with diffusivity plate 50, because the coefficient of diffusion of the close light-emitting element part of the diffuser of this diffusivity plate 50 formation face 51 is big, be easy to generate scattered light (diffusivity enhancing), so the light E3a that penetrates for the approximate right angle direction at the relative incidence surface 12a of light guide plate ₂Increase, the light quantity of the light guide plate edge part of light-emitting component side increases, thereby can prevent dark portion.

Also have, the coefficient of diffusion of the part beyond the close light-emitting element part of diffuser formation face 51 is little, suppressed the generation (diffusivity weakens) of scattered light, so the light E3b, the E3c that penetrate in the direction vertical with the extending direction of above-mentioned prismatic groove 14 increase, thereby the efficient that the 12b side penetrates below light guide plate 12 can not reduced.

In the divergent contour plate 50 that the front light-source 10 of present embodiment has, form the coefficient of diffusion of face 51 by the diffuser that increases the light-emitting component side, since inject to the light-emitting component side the light guide plate edge part light with respect to the incidence surface of above-mentioned light guide plate be the approximate right angle direction (in other words, the direction of light that injects to light guide plate is the acute angle direction with respect to the extending direction of above-mentioned prismatic groove), the efficient that side penetrates below light guide plate 12 reduces like this, the intensity of the light E2a that the reflecting surface 13j of the middle light conductor 13 of portion is reflected light-emitting component near increases, the incident light quantity that incides the diffusivity plate 50 of light-emitting component side increases, and incident light sees through the amount of scattered light (E3a that the diffusivity plate is produced ₁, E3a ₂, E3a ₃Light quantity) also increase, thereby can prevent from the light (illumination light) that other one side side of light guide plate penetrates diminish (weak).

On the other hand, because it is little with the coefficient of diffusion of light-emitting component side opposition side, inject to the vertical direction that is positioned at the extending direction of relative prismatic groove 14 with the light E3c of the light guide plate edge part of light-emitting component side opposition side, the efficient height that side penetrates below light guide plate 12 is not so also can increase near the reflecting surface 13j institute intensity of light reflected of the middle light conductor 13 of portion light-emitting component.

As mentioned above, if increase near the reflecting surface 13j institute intensity of light reflected of the middle light conductor 13 of portion light-emitting component, the light quantity that sees through diffusivity plate 50 scatterings of light-emitting component side increases, and the light quantity that injects to the light guide plate edge part of light-emitting component side increases, at this moment above-mentioned scattered light (E3a ₁, E3a ₂, E3a ₃) in also have the light inject to the light guide plate edge part adjacent part (light guide plate central portion) of light-emitting component side, therefore, as mentioned above, by reducing the intensity of the light E2b that is reflected at the reflecting surface central portion B1 of middle light conductor 13, the light quantity (light quantity of light E3b) that can prevent to inject to the light guide plate central portion is too much.

Like this, make and evenly to distribute from the illumination light quantity of the ejaculation of other one side side of light guide plate.

Therefore, utilize the front light-source 10 of present embodiment, can prevent from dark portion to occur at the light guide plate edge part of light-emitting component side, even only the 1 lamp type that light-emitting component 15 is set at an end face 13g of middle light conductor 13 also can carry out homogeneous and bright illumination in large area, and can the low consumption electrification.

Also have, present embodiment has illustrated that as shown in Figure 4 the diffuser at diffusivity plate 50 forms that to form the cross section on the face 51a be that protuberance and the cross section of triangle is the situation of the recess of V-shape, but also can be that to be formed with as shown in Figure 9 cross section be the diffusivity plate 60 that the diffuser of the micro concavo-convex of wave-like forms face 61.The coefficient of diffusion of this diffusivity formation face 61a is distributed as the Haze value and reduces in turn towards the direction with light-emitting component side opposition side.

Also have, present embodiment has illustrated that only an end face at the length direction of middle light conductor 13 is provided with the front light-source of 1 lamp type of light-emitting component 15, can certainly be provided with light-emitting component 15 in 2 ends of middle light conductor 13.

Also have, the lateral surface 13j that present embodiment has illustrated at middle light conductor 13 is provided with faceted pebble 13a, on the surface of faceted pebble 13a and/or the surface of non-faceted pebble 13c the situation of reflecting surface 17 is set, and is formed with a plurality of small concavo-convex male and fomale(M﹠F)s to replace faceted pebble 13 but also can be provided with.Also have, also reflectance coating can be set on the surface of these small male and fomale(M﹠F)s and the surface (lateral surface of the teat of middle light conductor 13) of non-male and fomale(M﹠F).Be formed with a plurality of cross sections on the lateral surface 13j of these small male and fomale(M﹠F)s and be circular-arc groove roughly, and the junction surface between these grooves and the groove do not form curved surface, tilt so shape of cross section is discontinuous curved surface.Also have, also can replace this small male and fomale(M﹠F) with the small male and fomale(M﹠F) of continuous curve with cross sectional shape that continuous curve surface tilts.At this moment, the junction surface between groove and the groove is a curved surface.The reflection characteristic that is provided with the lateral surface (reflecting surface) of the middle light conductor of this small male and fomale(M﹠F) distributes and also preferably to satisfy following relation: near the portion's intensity of light reflected above-mentioned light-emitting component＞with light-emitting component near portion's adjacent part (the reflecting surface central authorities of middle light conductor) intensity of light reflected＞with above-mentioned light-emitting component near the light intensity of portion's opposite side sub reflector.

Also have, present embodiment has illustrated that the extending direction of the groove 13b of the faceted pebble 13a that the lateral surface 13j of middle light conductor 13 go up to be provided with is in the situation with the direction of following 13m (face of the liquid crystal cell side of the middle light conductor 13) square crossing of middle light conductor 13 shown in Figure 16 A, but also can be shown in Figure 16 B tilts to intersect with the following 13m of middle light conductor 13.Also have, Figure 16 be the figure during from the lateral surface side observation middle light conductor 13 relevant with present embodiment.

Also have, present embodiment has illustrated between the outgoing plane 12k of the incidence surface 12a of light guide plate 12 and middle light conductor 13 and has been provided with the situation that diffuser forms the diffuser plate 50 of face 51a that is formed with, but also can form face being provided with the diffuser that the distance of its coefficient of diffusion with the outgoing plane 12k of light conductor 13 in the middle of leaving change on the outgoing plane 12k of the incidence surface 12a of light guide plate 12 or middle light conductor 13, to substitute the diffusivity plate 50 of above-mentioned setting.The formation method that this diffuser forms face can be the granularity that changes blasting treatment when the outgoing plane 12k to the incidence surface 12a of light guide plate 12 or middle light conductor 13 carries out blasting treatment along with the distance of leaving light-emitting component 15, perhaps also can be to carry out blasting treatment, corrosion etc. at the outgoing plane 12k to the incidence surface 12a of light guide plate 12 or middle light conductor 13 to form concavo-convex shape or the spacing of control when concavo-convex, perhaps also can be the shape or the spacing of control particulate during adhesion of particles on the outgoing plane 12k of the incidence surface 12a of light guide plate 12 or middle light conductor 13.

[liquid crystal display]

Liquid crystal display 20 is for carrying out the passive matrix liquid crystal display of the colored reflection-type that shows.As shown in Figure 3, clamping has liquid crystal layer 23 between upper substrate 21 that disposes in opposite directions and infrabasal plate 22.The inner face side of upper substrate 21 (liquid crystal layer 23 sides) is formed with overlooking to lacking a plurality of transparency electrode 26a, the alignment film 26b of palisade of diagram left and right directions extension in turn.The inner face side of infrabasal plate 22 (liquid crystal layer 23 sides) is formed with reflection horizon 25, chromatic filter layer 29 in turn, overlooks a plurality of transparency electrode 28a, alignment film 28b into short palisade.

The transparency electrode 28a of the transparency electrode 26a of upper substrate 21 and infrabasal plate 22 is the flat shape of short palisade, overlooks to be the band shape arrangement.The bearing of trend of the bearing of trend of transparency electrode 26a and transparency electrode 28a is mutual homeotropic alignment when overlooking.Therefore, 1 picture point of 1 transparency electrode 26a and 1 transparency electrode 28a intersection location formation liquid crystal display 20.Each picture point is corresponding with the colored filter of 1 look in the colored filter of 3 looks described later (red, green, blue) respectively.As shown in Figure 3, send 1 pixel 20c of 3 picture points formation liquid crystal displays 20 of R (redness), G (green), B (indigo plant) light respectively.Also have, as shown in Figure 2, when overlooking, a large amount of pixel 20c arranges with array-like in the 20D of viewing area.

Color filter layers 29 forms for colored filter 29R, the 29G of red, green, blue, 29B periodic arrangement.Each colored filter lays respectively at the downside of corresponding transparency electrode 28a with it.Each pixel 20c disposes 1 group of colored filter 29R, 29G, 29B.Like this, control the demonstration look of pixel 20c by control and each group colored filter 29R, the corresponding electrode of 29G, 29B.

In the liquid crystal indicator of present embodiment, the extending direction of the prismatic groove 14 that forms on the light guide plate 12 of front light-source 10 and the line of pixels column direction of liquid crystal display 20 cross one another.That is, the extending direction of the loop direction of the RGB of the colored filter 29 of generation cycle striped and prismatic groove 14 is not parallel on liquid crystal display 20, thereby prevents to produce the Moire fringe decorative pattern because of the optical interference of the two.

Fig. 6 is the plane structure chart after neighbor group's the amplification of liquid crystal display 20 shown in Figure 2.As shown in the drawing, in liquid crystal display 20, a plurality of pixel 20c form the array shape when overlooking, and each pixel 20c has 1 group of colored filter 29R, 29G, 29B.Like this, as shown in Figure 6, in the liquid crystal indicator of present embodiment, there is angle of inclination beta in the extending direction of the prismatic groove 14 of the front light-source 10 that the two point line of Fig. 6 is represented with respect to the orientation (diagram left and right directions) of the pixel 20c of liquid crystal display 20.

This prismatic groove 14 is preferably the scope below 15 ° more than 0 ° with respect to the angle of inclination beta of the orientation (diagram left and right directions) of pixel 20c, be more than 6.5 ° 8.5 ° with next better.By setting this scope, can prevent with the periodic structure generation optical interference of the pixel of liquid crystal display 20 and produce the Moire fringe decorative pattern.If be in beyond the above-mentioned scope, the effect that alleviates the Moire fringe decorative pattern then diminishes.Also have, if above-mentioned angle of inclination beta is the scope below 8.5 ° then better more than 6.5 °.By setting this scope, can further improve the effect that prevents the Moire fringe decorative pattern.Also have, if the Moire fringe decorative pattern can not occur interfering, above-mentioned angle of inclination beta also can be 0 °.

As shown in Figure 2, in the liquid crystal indicator of present embodiment, because the light guide plate side end face 12a of front light-source 10 and the line of pixels column direction of liquid crystal display 20 are in parastate, angle [alpha] between the extending direction of above-mentioned prismatic groove 14 and the light guide plate side end face 12a and be not equal to the extending direction of prismatic groove 14 and the orientation of pixel 20c between angle beta, so when the orientation of light guide plate side end face 12c and pixel 20c was not parallel, inclined angle alpha and β were unequal.At this moment, in order to alleviate the Moire fringe decorative pattern, can make angle of inclination beta be in above-mentioned scope than α is preferential.In case determined angle of inclination beta, also determined the extending direction of prismatic groove 14, therefore as long as the angle of the angular setting light guide plate side end face 12c of relative prismatic groove 14 makes its scope that is in inclined angle alpha, thereby makes being evenly distributed of quantity of light emission of light guide plate 12.

The organic film that reflection horizon 25 is made up of the acrylic resin material, the metallic reflective coating by high reflectances such as Al or Ag that forms on this organic film are formed, and on the surface in this reflection horizon 25, are provided with a plurality of recesses with light reflective.The purpose of above-mentioned organic film is to make above-mentioned metallic reflective coating have the surface configuration of regulation.

The liquid crystal indicator of present embodiment has the front light-source 10 that can carry out the illumination of homogeneous and bright ground to large tracts of land, can carry out the homogeneous and bright ground illumination of high brightness ground to whole viewing area 20D, therefore can obtain good display characteristic.Also have, even during the light-emitting component of lighting device 1 lamp, the homogeneity of brightness can not reduce yet, thereby can obtain to have good demonstration visibility, good display characteristic and the liquid crystal indicator of low power consumption.

[active array type liquid crystal display]

In the above-mentioned embodiment, liquid crystal display 20 is a passive matrix, but the liquid crystal indicator relevant with the present invention also is applicable to the active array type liquid crystal display.At this moment, the planar structure of liquid crystal display is identical with the liquid crystal display 20 of the embodiment of front as shown in Figure 2, so also adopt Fig. 2 in the following explanation.That is, the liquid crystal display of this structure has when overlooking a plurality of pixel 20c that are in array-like arrangement.

The plane structure chart of the pixel 20c that in the liquid crystal display of this structure, forms as shown in Figure 7, along the cross section structure figure of the VIII-VIII line of Fig. 7 as shown in Figure 8.The liquid crystal indicator of Fig. 7,8 expressions forms for clamping liquid crystal layer 33 between the upper substrate 31 that disposes in opposite directions, infrabasal plate 32, and the inner face side of upper substrate 31 (liquid crystal layer 33 sides) has a plurality of roughly OBL transparency electrode 36 that is in array-like arrangement when overlooking, the triode T as pixel switch that forms on each this transparency electrode 36.The transparency electrode 38 that the inner face side of infrabasal plate 32 (liquid crystal layer 33 sides) has reflection horizon 35, forms on chromatic filter layer 39 that forms on this reflection horizon 35 and at this chromatic filter layer 39 whole.Like this, the zone of formation and R, G, 3 transparency electrodes 36 that B is corresponding is corresponding to 1 pixel 20c.Also have, for convenience's sake, T is drawn as equivalent circuit diagram with triode among Fig. 7.

Above-mentioned transparency electrode 36 is carried out one distolaterally being connected with transparency electrode 36 of triode T of switch control, the sweep trace G1-G3 of other two ends of triode T and the extension of the diagram left and right directions between transparency electrode 36 and the signal wire S1 that illustrates the above-below direction extension are connected.Also have, dispose colored filter 39R, 39G, 39B respectively on the chromatic filter layer 39 of the position corresponding with the transparency electrode 36 of infrabasal plate 32, being formed with between adjacent colored filter 39R, 39G, 39B when overlooking is cancellate black array 39M.Also have, though omit among the figure, also being formed with when surrounding the overlooking of transparency electrode 36 on the inner face side of upper substrate 31 is cancellate black array, can not shine on triode T or sweep trace that is attached thereto or the signal wire from the light of upper face side incident.

Also have,, can adopt the identical reflection horizon of structure illustrated in the embodiment of front 25 as the reflection horizon 35 of this routine liquid crystal display.

The liquid crystal display of said structure is by the current potential of triode T control transparency electrode 36, and then the light transmission state of the liquid crystal layer between the transparency electrode 38 of control transparency electrode 36 and infrabasal plate 32, shows.

In the active array type liquid crystal display, be that cancellate light-proofness black array surrounds transparency electrode 36 when overlooking, and owing to can improve the contrast of display degree, so the periodicity decorative pattern of pixel 20c is more obvious than passive matrix liquid crystal display.Promptly, though the optical interference between the prismatic groove 14 of the periodic arrangement of pixel 20c and front light-source 10 takes place easily, but in the liquid crystal indicator of present embodiment, the extending direction of prismatic groove 14 intersects with the orientation of pixel 20c, thereby can suppress above-mentioned interference, prevent owing to the Moire fringe decorative pattern reduces visibility effectively.Like this, even adopt the active array type liquid crystal display to assemble liquid crystal indicator of the present invention, also can eliminate the Moire fringe decorative pattern, thereby the liquid crystal indicator that can show to homogeneous and bright is provided in its viewing area.

Also have, Fig. 8 has represented that 35 sides form the situation of chromatic filter layer 39 in the reflection horizon, but also can form the electrode of using as pixel switch in infrabasal plate 32 sides, makes this electrode double as reflection horizon simultaneously, forms chromatic filter layer in upper substrate 31 sides.

Also have, liquid crystal indicator for above-mentioned embodiment, the situation of the front light-source (lighting device) 10 of face side (substrate 21 sides) the configuration present embodiment at liquid crystal display 20 has been described, but also can dispose the lighting device 10 of present embodiment in the rear side of liquid crystal display 20, use as backlight.At this moment, the outgoing plane 12b side of the light guide plate 12 of lighting device 10 is positioned at liquid crystal display side (substrate 22 sides).

The manufacture method of the manufacturing of the diffusivity plate 50 that the front light-source 10 that is applicable to present embodiment is possessed then, is described.

[the 1st example of diffusivity board fabrication method]

The general structure of the example of the diffusivity board manufacturing apparatus of the manufacture method of the diffusivity plate that Figure 10 represents to be applicable to that this is routine.

This diffusivity board manufacturing apparatus have in opposite directions configuration a pair roller 71,72, cooling roll (cooling-part) 73, be configured in the downside of this cooling roll 73 coldplate (cooling-part) 74, batch roll 75.

Roll 71 in a pair roller 71,72 is a processing roll, and another roll 72 is for sending roll.

As shown in figure 11, the side face 71a of processing roll 71 is provided with and is formed with the duplicating mould 71b that has changed a large amount of micro concavo-convexes of shape and/or distribution density in the fabric width direction of above-mentioned roll.

In this device, send rectangular plate body 76 from sending roll 72, utilization is simultaneously batched roll 75 and is batched plate body 76.

As plate body 76, the light transmission plate that adopts thermoplastic resin membranes such as polycarbonate, tygon, polystyrene to form.

When adopting diffusivity board manufacturing apparatus shown in Figure 10 to make the diffusivity plate, rotation drives a pair roller 71,72, between this a pair roller 71 and 72, supply with rectangular plate body 76 continuously, when when the sense of rotation of a pair roller 71,72 is drawn this plate body 76, press in the one side of plate body 76 and to duplicate mould 71b and heat, the diffuser that the fabric width direction that is formed on this plate body in the one side of plate body 76 has changed coefficient of diffusion forms face.Then, the plate body after this heating and pressurizing 76 is supplied between cooling roll 73 and the coldplate 74, after plate body 76 is contacted with these cooling-parts and making it to cool off, utilization is batched roll 75 and is batched.

Then, as shown in figure 12, will after batching the plate body 76 that batches on the roll 75 and cutting off, obtain required diffusivity plate 50 along the cut-out line 79,79 of fabric width direction.Symbol 51a among Figure 12 is that the diffuser that forms on plate body 76 forms face 51a.

[the 2nd example of diffusivity board fabrication method]

The general structure of the example of the diffusivity board manufacturing apparatus of the manufacture method of the diffusivity plate that Figure 13 represents to be applicable to that this is routine.

This diffusivity board manufacturing apparatus have with photo-hardening type resin liquid spue rectangular tabular substrate the surface the jet pipe that spues (coating parts) 80, a pair roller 82,83 that disposes in opposite directions in this side that spues jet pipe 80, at the roll that can rotate driving 81 of the side of this a pair roller 82,83 configuration, dispose UV lamp (light irradiation unit) 84a of (in the downside configuration of roll 81) with this roll 81 in opposite directions, batch roll 85 in the setting of the side of roll 81.

A roll 82 in a pair roller 82,83 is for sending roll, and another roll 83 is the coating roll.Coating roll 83 evenly distributes the photo-hardening type resin liquid on the surface that is coated on rectangular tabular substrate 86.

Also have, roll 81 is a processing roll, and is the same with the processing roll of Figure 11, is provided with to be formed with the duplicating mould that has changed a large amount of micro concavo-convex of shape and/or distribution density in the fabric width direction of above-mentioned roll on its side face 81a.

In this device, send rectangular plate-like substrate 86 from sending roll 82, utilization is simultaneously batched roll 85 and is batched plate-like substrate 86.

Also have, the allocation position of UV lamp (light irradiation unit) 84a can be the side of processing roll 81, also can be two places in below and side of processing roll 81.

Also have, also can replace being coated with roll 83 with blade.

As rectangular plate-like substrate 86, adopt light transmission plates such as polycarbonate, polyethylene terephthalate (PET), tygon, triacetyl cellulose, propylene.

As the photo-hardening type resin liquid that spues from the jet pipe 80 that spues, adopt mephenesin Carbamate or epoxy resin denaturing acrylamide resinoid etc.

When utilizing diffusivity board manufacturing apparatus shown in Figure 13 to make the diffusivity plate, the photo-hardening type resin liquid that spues from the jet pipe 80 that the spues plate-like substrate 86 that spues, between a pair roller 82 and 83 that rotation drives, supply with base material 86 then continuously, along a pair roller 82,83 sense of rotation is drawn this plate-like substrate 86, after the surface of plate-like substrate 86 forms hardening resin layer 80a, the duplicating mould of the processing roll 81 that rotation drives on the surface pressure of this photo-hardening type resin bed 80a, the fabric width direction that is formed on above-mentioned plate-like substrate on the surface of above-mentioned photo-hardening type resin bed 80a has changed the diffuser formation face of coefficient of diffusion.At this moment, photo-hardening type resin bed 80a is under the pressure status of the duplicating mould that is subjected to above-mentioned processing roll 81, acceptance is from UV (ultraviolet) rayed of UV lamp 84a, makes to have formed the photo-hardening type resin bed 80a sclerosis that diffuser forms face, utilizes then to batch roll 85 and batch.Afterwards, batched base material and above-mentioned the 1st example that roll 85 batches and cut off equally, obtained required diffusivity plate.

Also have, when UV (ultraviolet light) lamp 84a is configured in the side of processing roll 81, after the surface of above-mentioned photo-hardening type resin bed 80a forms above-mentioned diffuser formation face, use this photo-hardening type resin bed of UV rayed 80a of UV lamp 84a to get final product.

Also have, in the said apparatus, after forming photo-hardening type resin bed 80a on the plate-like substrate, the device that this photo-hardening type resin bed 80a is carried out preliminary drying can be set also.

[the 3rd example of diffusivity board fabrication method]

Figure 14 is the general structural drawing of example of the diffusivity board manufacturing apparatus of the expression manufacture method that is applicable to the diffusivity plate that this is routine.

This diffusivity board manufacturing apparatus has in opposite directions a configuration a pair of mixing with roll 91,92, be configured in its side a pair roller 93,94, batch roll 95.

Mixingly supply with continuously the printing ink that light transmission particulate and bonding agent mix between with roll 91,92 a pair of.As the light transmission particulate, adopt SiO ₂The plastic grain of particulate, diphenylethylene, polystyrene type, PMMA (polymethylmethacrylate) class etc.The particle diameter of these light transmission particulates is preferably below the 5 μ m.

As bonding agent, adopt epikote, the phenol resin, thermmohardening type resin liquid such as mephenesin Carbamate resinoid are perhaps by the ultraviolet hardening resin liquid of the propylene resin of mephenesin Carbamate or epoxy sex change etc. etc.

Roll 93 in a pair roller 93,94 is the coating roll, and its side face contacts with above-mentioned roll 92, and another roll 94 is for sending roll.Coating roll 93 evenly distributes the printing ink on the surface that is coated on tabular substrate 86.

When utilizing diffusivity board manufacturing apparatus shown in Figure 14 to make the diffusivity plate, the photo-hardening type resin liquid that spues from the jet pipe 80 that the spues plate-like substrate 86 that spues, drive between a pair of mixing roll 91 and 92 of plate-like substrate 86 stroll light transmission particulate and bonding agent and be mixed and made into printing ink in rotation then, this moment more than one the factor in the shape of the light transmission particulate that the fabric width direction change of above-mentioned roll is taken a walk, distribution density, refractive index.

Then, between a pair roller 94 and 95 that rotation drives, supply with above-mentioned printing ink and plate-like substrate 86 continuously, draw this plate-like substrate 86, form ink lay 90a on the surface of plate-like substrate 86 along the sense of rotation of a pair roller 82,83.Here the ink lay 90a of Xing Chenging has changed more than one factor in the shape, distribution density, refractive index of above-mentioned light transmission particulate in the fabric width direction of plate-like substrate 86, forms face so the surface of above-mentioned ink lay 90a has formed the diffuser that fabric width direction in above-mentioned plate-like substrate 86 changed coefficient of diffusion.

Then, the plate-like substrate 86 that is formed with ink lay 90a carried out necessary UV light (ultraviolet light) irradiation or heating after, utilize and batch roll 95 and batch.Afterwards, batched base material and above-mentioned the 1st example that roll 95 batches and cut off equally, obtained required diffusivity plate.

[the 4th example of diffusivity board fabrication method]

Figure 15 is the general structural drawing of example of the diffusivity board manufacturing apparatus of the expression manufacture method that is applicable to the diffusivity plate that this is routine.

This diffusivity board manufacturing apparatus have in opposite directions configuration a pair roller 101,102, be configured in roll 101,102 the below batch roll 103.

Roll 101 in a pair roller 101,102 is a processing roll, and another roll 102 is for sending roll.Photo-hardening type resin liquid 104 such as propylene resin by mephenesin Carbamate or epoxy sex change supply between a pair roller 101,102 continuously.

The same with the processing roll of Figure 11, the side face 101a of processing roll 101 is provided with and is formed with the duplicating mould that has changed a large amount of micro concavo-convexes of shape and/or distribution density in the fabric width direction of above-mentioned roll.

In this device, send the plate body 104a that sclerosis formation takes place photo-hardening type resin liquid from sending roll 102, utilization is batched roll 103 and is batched plate body 104a then.

When utilizing diffusivity board manufacturing apparatus shown in Figure 15 to make the diffusivity plate, between a pair roller 101 and 102 that rotation drives, supply with photo-hardening type resin liquid 104 continuously and make it to become plate body 104a, when the sense of rotation of a pair roller 101,102 is drawn, above-mentioned photo-hardening type resin liquid is contacted with the duplicating mould of above-mentioned processing roll 101, the diffuser that the fabric width direction that is formed on this plate body in the one side of above-mentioned plate body 104a has changed coefficient of diffusion forms face, carry out the UV irradiation then, utilization is batched roll 103 and is batched.Afterwards, batched base material and above-mentioned the 1st example that roll 103 batches and cut off equally, obtained required diffusivity plate.

Also have, be preferably in above-mentioned photo-hardening type resin liquid with the contacted state of duplicating mould of processing roll 101 under or after the one side of plate body 104a forms diffuser formation face, carry out rayed, above-mentioned photo-hardening type resin liquid is hardened.

[the 5th example of diffusivity board fabrication method]

Figure 17 is the general structural drawing of example of the diffusivity board manufacturing apparatus of the expression manufacture method that is applicable to the diffusivity plate that this is routine.Figure 17 A is a sectional view, and Figure 17 B is a vertical view.

This diffusivity board manufacturing apparatus have in opposite directions configuration a pair of mould 105a, 105b, the inner face of one of them mould (being the mould 105a of upside in the present embodiment) is to be formed with a large amount of micro concavo-convexes 106 that changed shape and/or distribution density at fabric width direction W in a pair of mould 105a, 105b.Symbol 107 among Figure 17 is pressed into mouth for material.To be pressed into mouthfuls 107 places far away more then close more leaving material for a large amount of micro concavo-convexes 106 that the inner face of mould forms.

When utilizing diffusivity board manufacturing apparatus shown in Figure 17 to make the diffusivity plate, be pressed into mouthful material 108 of 107 plate bodys (diffusivity plate) from material and be pressed into a pair of mould 105a, 105b and shaping the heating and melting state, at least after the one side of plate body 109 is formed on diffuser that the fabric width direction changed coefficient of diffusion and forms face 109a, remove mould, take out this plate body 109, be cut into required size, obtain required diffusivity plate.The direction that is pressed into of plate body material 108 is the direction (1. the material of Figure 17 B is pressed into direction) of dredging from the formed micro concavo-convex 106 of the inner face of mould, and this direction is because the material resistance of pressing in is less, so more satisfactory.But also can inject from the Width side (direction vertical, promptly 2. the material of Figure 17 B is pressed into direction) of mould with the Width W of mould.

The manufacture method of each in the 1st of the manufacture method of above-mentioned diffusivity plate～the 5th example can both high-efficiency and continuous the diffusivity plate that front light-source possessed of ground production present embodiment, can make diffusivity plate cost degradation.Also have, the manufacture method of the diffusivity plate in the 1st～the 5th example also is fit to the diffusivity plate that the backlight (lighting device) relevant with the present invention possessed.

[embodiment]

Below, utilize embodiment that the present invention is described in further detail.But following embodiment does not limit the present invention.

(embodiment)

In the present embodiment, Fig. 1 is to liquid crystal indicator shown in Figure 6, adopt along the length of the direction (length direction) of incidence surface 12a as the light guide plate 12 of front light-source 10 to be 66.2mm, to be that 48mm, thickness are the propylene resin system rectangular slab of 0.975mm, and the spacing P of prismatic groove 14 that forms the reflecting surface 12c of this rectangular slab is 0.191mm along the length of the direction (Width) of edge surface 12g.The tilt angle theta of the 14a of gently sloping surface portion ₁Be 1.8 degree, the tiltangle of the facial 14b of steeply inclined ₂Be 42 degree.Adopt White LED (NSCW215T of day inferior chemistry manufacturing) as light-emitting component 15.As diffusivity plate 50, form a large amount of micro concavo-convexes in the one side of above-mentioned light transmission plate, and form the diffuser that has changed coefficient of diffusion along with the distance of leaving light-emitting component 15 and form face 51a.Adopt along the length of the direction (length direction) of lateral surface 13j as middle light conductor 13 and to be 68mm, to be that 3mm, thickness are the propylene resin system quadrangular of 0.9mm along the length of the direction (Width) of end face 13g, the formation starting position of the light-emitting component side of the faceted pebble 13a that forms on lateral surface 13j is the extended line L of the light-emitting component side edge surface 12g of light guide plate 12, has in faceted pebble 13a intensity of light reflected to begin in turn (beginning in turn from the left side of Fig. 4) near the side light-emitting component and distribute for large, medium and small reflection characteristic.Also have, the cross section is the groove 13b and (the interval P of the interval between the 13b of chock shape ₃) being in the scope of 0.200-0.240mm, the degree of depth is in 8～74 mu m ranges, and the angle a between inclined-plane 13b1, the 13b2 is 110 degree, and the angle b of inclined-plane 13b1 is 35 degree, and the angle c of inclined-plane 13b2 is that 35 degree are made front light-source.

Also have, in order to compare, 12 of middle light conductor 13 and light guide plate are provided with the Haze value and are fixed on 90 diffusivity plate, except middle light conductor light brightness distribution has as shown in Figure 2 characteristic with as a comparative example, all the front light-source with above-mentioned manufacturing is identical for other

Penetrate the test result such as the table 1 and shown in Figure 180 of position X (mm) and the variation of Haze value (%) of the diffusivity plate of light time from the middle light conductor of the front light-source of the embodiment of manufacturing.Also have, the position of diffusivity plate is the distance of extended line L of edge surface 12g of leaving the light-emitting component side of light guide plate 12.

Also have, penetrate the position X (mm) of light time and the test result such as the table 1 and shown in Figure 19 of emitting brightness distribution from middle the light conductor of the front light-source of the embodiment of manufacturing.Also have, the emitting brightness of middle light conductor is distributed as the test result through the Luminance Distribution before the diffusivity plate.

Also have, also carried out the variation, position X (mm) of the position X (mm) of same relevant diffusivity plate and Haze value (%) and the test of emitting brightness distribution for the front light-source of comparative example.Its result is as shown in table 2.

Also have, the brightness of the outgoing plane of the light guide plate of the front light-source of embodiment and comparative example is also tested.

Table 1

Embodiment

The position * (mm)	??5	??15	??25	????35	??45	????55	????65
								Haze value (%)	??95	??95	??90	????80	??75	????75	????75
Middle light conductor emitting brightness distributes	??113	??113	??105	????98	??92	????92	????92

Table 2

Comparative example

The position * (mm)	????5	????15	??25	??35	??45	??55	????65
								Haze value (%)	????90	????90	??90	??90	??90	??90	????90
Middle light conductor emitting brightness distributes	????95	????100	??105	??105	??105	??100	????90

Learn that from table 1-table 2 and Figure 18-result shown in Figure 19 the Luminance Distribution of the middle light conductor that the front light-source of embodiment possessed has the distance X of leaving extended line L and is large, medium and small Luminance Distribution from small to large in turn.Also have, the Haze value of diffusivity plate reduces along with the increase of the distance X of leaving extended line L, and therefore, the distribution of coefficient of diffusion makes the distribution of Haze value reduce in turn towards the direction with light-emitting component side opposition side.

Also have, the quantity of light emission in the light guide plate face in the front light-source of embodiment has good homogeneous.

Also have, make the equally distributed design of brightness,, penetrate the reduction of Luminance Distribution at the middle light conductor that leaves light-emitting component position far away and but can't avoid if improve mean flow rate though the front light-source of comparative example has adopted.

Also have, in the front light-source of embodiment, by making the Haze value variation as shown in table 1 of diffusivity plate, as the front light-source of comparative example, being in steady state with the Haze value that makes the diffusivity plate shown in the table 2 compares, it is about 10% that the brightness of light guide plate face has improved, thereby improved the quantity of light emission in the light guide plate face as can be known.

(invention effect)

As above describe in detail, utilize lighting device of the present invention, can prevent from dark section occurring at the LGP edge part of light-emitting component side, the lighting device of the low power consumption that can throw light on brightly at Large-Area-Uniform is provided.

Also have, utilize liquid crystal indicator of the present invention, the liquid crystal indicator with good display characteristic of high brightness can be provided.

Claims (18)

1. lighting device, be have light guide plate, be provided in a side end face of this light guide plate middle light guide plate, be provided in the lighting device of light-emitting component of end face of the length direction of this centre light guide plate, it is characterized in that:

The side end face of the lead-in light of described light guide plate is an incidence surface, with the side of light conductor in the middle of in opposite directions described of the incidence surface of described light guide plate for the light of described light-emitting component being injected to the exit facet of light guide plate, the reflecting surface of lateral surface with the middle light conductor of this exit facet opposition side for the light in this centre light conductor internal transmission is reflected, there is the diffusivity plate between the exit facet of the incidence surface of described light guide plate and described middle light conductor, this diffusivity plate and incidence surface described light guide plate one side in opposite directions are provided with diffuser and form face, and the coefficient of diffusion that this diffuser forms face changes along with the distance of leaving described light-emitting component.

2. lighting device, be have light guide plate, be provided in a side end face of this light guide plate middle light guide plate, be provided in the lighting device of light-emitting component of end face of the length direction of this centre light guide plate, it is characterized in that:

The side end face of the lead-in light of described light guide plate be incidence surface, with in opposite directions described of the incidence surface of described light guide plate in the middle of light conductor the side for the exit facet that the light of described light-emitting component injected to light guide plate, with the lateral surface of middle the light conductor of this exit facet opposition side be the reflecting surface that the light in this centre light conductor internal transmission is reflected, the exit facet of the incidence surface of described light guide plate or described middle light conductor is provided with diffuser and forms face, and the coefficient of diffusion that this diffuser forms face changes along with the distance of leaving described light-emitting component.

3. lighting device according to claim 1 and 2 is characterized in that:

Described diffuser forms the coefficient of diffusion of face and represents that with Haze the Haze value of the light-emitting component side on the described diffuser formation face is greater than the Haze value of opposition side.

4. lighting device according to claim 1 and 2 is characterized in that:

Described diffuser forms the coefficient of diffusion of face and represents that with Haze the Haze value on the described diffuser formation face is towards reducing in turn with light-emitting component side opposition side.

5. according to the described lighting device of each claim in the claim 1 to 4, it is characterized in that:

Be formed with a large amount of micro concavo-convexes on the described diffuser formation face.

6. according to the described lighting device of each claim in the claim 1 to 5, it is characterized in that:

The formation of the reflecting surface of light conductor makes near the light intensity of the intensity of light reflected light-emitting component greater than near the opposite side sub reflector of portion described light-emitting component in the middle of described.

7. according to the described lighting device of each claim in the claim 1 to 5, it is characterized in that:

In the middle of described the reflecting surface intensity of light reflected of light conductor towards with described light-emitting component near part opposition side part reduce in turn.

8. according to claim 6 or 7 described lighting devices, it is characterized in that:

Being provided with by a plurality of cross sections at the reflecting surface of described light guide plate is the faceted pebble that the groove of chock shape forms, and changes the spacing and/or the degree of depth that described cross section is the groove of chock shape.

9. lighting device according to claim 2 is characterized in that:

Described diffuser form face by to the incidence surface of described light guide plate or described in the middle of the outgoing plane of light conductor carry out blasting treatment and form, and change the roughness of blasting treatment along with the distance of leaving described light-emitting component.

10. liquid crystal indicator is characterized in that:

Have according to described lighting device of each claim in the claim 1 to 9 and the liquid crystal display that utilizes this lighting device to throw light on.

11. the manufacture method of a diffusivity plate is the manufacture method that is used to make the diffusivity plate of the lighting device that throws light on from the light diffusion of light source and to illuminated zone, it is characterized in that:

Utilization has a pair roller of configuration in opposite directions, the side face of one of them roll of described roll is provided with a large amount of micro concavo-convexes and forms the manufacturing installation that is provided with the processing roll that duplicates mould in shape and/or distribution density that the fabric width direction of described roll changes micro concavo-convex, the described a pair roller of driven in rotation, between this a pair roller, supply with plate body continuously, when this plate body is pressed in the duplicating mould of described processing roll when the sense of rotation of described a pair roller is pulled out on the one side of this plate body and heats simultaneously, thereby the diffuser that has changed coefficient of diffusion on the fabric width direction that is formed on this plate body on the one side of described plate body forms face.

12. the manufacture method of diffusivity plate according to claim 11 is characterized in that:

After forming described diffuser formation face on the one side of described plate body, this plate body is contacted with cooling-part, cool off.

13. the manufacture method of a diffusivity plate is the manufacture method that is used to make the diffusivity plate of the lighting device that throws light on from the light diffusion of light source and to illuminated zone, it is characterized in that:

Utilization has a pair roller of configuration in opposite directions, the side face of one of them roll of described roll is provided with a large amount of micro concavo-convexes and forms the manufacturing installation that is provided with the processing roll that duplicates mould in shape and/or distribution density that the fabric width direction of described roll changes micro concavo-convex, drive described a pair roller rotation, between this a pair roller, supply with photo-hardening type resin liquid continuously, make it to become plate body and contacting with the duplicating mould of described processing roll at described photo-hardening type resin liquid when the sense of rotation of described a pair roller is pulled out, thereby the diffuser that has changed coefficient of diffusion on the fabric width direction that is formed on this plate body on the one side of described plate body forms face.

14. the manufacture method of diffusivity plate according to claim 13 is characterized in that:

Described photo-hardening type resin liquid with the contacted state of duplicating mould of described processing roll or one side at described plate body on form described diffuser formation face after, carry out rayed, described photo-hardening type resin liquid or described plate body are hardened.

15. the manufacture method of a diffusivity plate is the manufacture method that is used to make the diffusivity plate of the lighting device that throws light on from the light diffusion of light source and to illuminated zone, it is characterized in that:

Utilization has the coating parts of coating photo-hardening type resin liquid, the side face of roll, this roll that can driven in rotation is provided with a large amount of micro concavo-convexes and forms the manufacturing installation that is provided with the processing roll that duplicates mould in shape and/or distribution density that the fabric width direction of described roll changes micro concavo-convex

Utilize described coating parts at the surface coated photo-hardening type resin liquid of plate-like substrate and after forming photo-hardening type resin bed, the duplicating mould of the described processing roll that rotation is driven is pressed in the surface of described photo-hardening type resin bed, forms face thereby be formed on the diffuser that has changed coefficient of diffusion on the fabric width direction of described plate-like substrate on the surface of described photo-hardening type resin bed.

16. the manufacture method of diffusivity plate according to claim 15 is characterized in that:

At the state of the duplicating mould of resin laminated the above processing roll of described photo-hardening type or after the surface of described photo-hardening type resin forms described diffuser formation face, carry out rayed, described photo-hardening type resin bed is hardened.

17. the manufacture method of a diffusivity plate is the manufacture method that is used to make the diffusivity plate of the lighting device that throws light on from the light diffusion of light source and to illuminated zone, it is characterized in that:

Thereby when the printing ink formation ink lay that the one side of plate-like substrate coating light transmission particulate mixes with bonding agent, change along the fabric width direction of plate-like substrate in shape, distribution density and the refractive index of described light transmission particulate more than any one, form face thereby be formed on the diffuser that has changed coefficient of diffusion on the fabric width direction of described plate-like substrate on the surface of described ink lay.

18. the manufacture method of a diffusivity plate is the manufacture method that is used to make the diffusivity plate of the lighting device that throws light on from the light diffusion of light source and to illuminated zone, it is characterized in that:

Utilization has a pair of mould of configuration in opposite directions, in described a pair of mould, be provided with a large amount of micro concavo-convexes at least one mould and change the manufacturing installation that its shape and/or distribution density form in the fabric width direction, the plate body material of heating and melting state is pressed into described a pair of mould and shaping, thereby is formed on the diffuser formation face that has changed coefficient of diffusion on the fabric width direction in the one side at least of described plate body.

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