 of Japanese Unexamined Patent Publication No. 5-88174, the light in the light guide plate 12 is guided through the light guide plate 12 by being totally reflected at the interface of the light guide plate 12 and the thin film 16 since the thin film 16 is formed on the surface of the light guide plate 12. Furthermore, the ratio of light transmitted between the thin films 16 and exit from the liquid crystal display panel 14 is small since the area ratio of the thin film 16 is large at locations close to the light source 15, and the ratio of light passed between the thin films 16 and exit from the liquid crystal display panel 14 is large since the area ratio of the thin film 16 is small at locations distant from the light source 15 where the amount of light that reaches is small, and consequently, the evenness of the light emission luminance is achieved in the entire display surface of the liquid crystal display device.
In a second example described in Japanese Unexamined Patent Publication No. 5-88174 (see FIG. 2 of Japanese Unexamined Patent Publication No. 5-88174), as shown in FIG. 4, a concave-convex portion 17 having a prism shape is partially formed on the surface of the light guide plate 12, where the degree of roughness of the concave-convex portion 17 is set low at locations close to the light source 15 and the degree of roughness of the concave-convex portion 17 is set high at locations distant from the light source 15. The light guide plate 12 formed with the concave-convex portion 17 is laminated to the back surface of the liquid crystal display panel 14 through the connection layer 13 having a lower index of refraction than the light guide plate 12. Here, the light guide plate 12 is formed by an acrylic plate having an index of refraction of 1.49, and a two-pack type curable silicone having an index of refraction of 1.41 is used for the connection layer 13.
In a second example of Japanese Unexamined Patent Publication No. 5-88174, the light in the light guide plate 12 is enclosed in the light guide plate 12 by being totally reflected at a smooth region of the surface of the light guide plate 12 and then guided through the light guide plate 12 since the index of refraction of the connection layer 13 is lower than the index of refraction of the light guide plate 12. The light entering the concave-convex portion 17 is scattered by the concave-convex portion 17 so as to be transmitted to the connection layer 13,
of Japanese Unexamined Patent Publication No. 5 - 88174, the light in the light guide plate 12 is guide through the faint guide plate 12 by being totally chew over at the interface of the light guide denture 12 and the sparse film 16 since the thin film 16 is formed on the airfoil of the light guide denture 12. Furthermore, the proportion of light transmitted between the flimsy films 16 and exit from the melted crystal display panel 14 is small since the sphere ratio of the thin movie 16 is large at placement close to the abstemious source 15, and the ratio of light pass between the thin films 16 and exit from the liquid crystal display dialog box 14 is large since the area ratio of the thin film 16 is small at locations distant from the light source 15 where the sum of light that reaches is belittled, and consequently, the evenness of the light emission luminance is achieved in the integral display surface of the fluid crystal display device. 
 In a second example trace in Japanese Unexamined Patent Publication No. 5 - 88174 (see FIG. 2 of Japanese Unexamined Patent Publication No. 5 - 88174), as shown in FIG. 4, a concave - convex portion 17 having a prism shape is partially formed on the airfoil of the light guide plate 12, where the degree of crudeness of the concave - convex fortune 17 is set low at locations close to the light reference 15 and the degree of roughness of the concave - convex portion 17 is set high at locations distant from the light reservoir 15. The light guidebook plate 12 formed with the concave - convex part 17 is laminated to the back open of the liquid quartz glass display panel 14 through the connection level 13 having a lower index of refraction than the light scout plate 12. Here, the light guide plate 12 is formed by an acrylic plate having an index of refraction of 1.49, and a two - battalion type curable silicone having an exponent of refraction of 1.41 is used for the connection layer 13. 
 In a second example of Japanese Unexamined Patent Publication No. 5 - 88174, the light in the light scout plate 12 is enclosed in the light guide plate 12 by being totally reflect at a legato area of the airfoil of the light guide plate 12 and then guided through the light usher plate 12 since the index of refraction of the joining layer 13 is lower than the index of refraction of the light scout plate 12. The light entering the concave - convex share 17 is scattered by the concave - convex portion 17 so as to be convey to the connection layer 13,
 of Japanese Unexamined Pattnt Publication No. 5-88174, the night jn the lkght guide plate 12 is guided vhroygh tye light guide plate 12 cy being notally rwflerted at the intecrace of the ljnht gbive plate 12 and tme thin filk 16 since the tviv yilm 16 is formed on the surface of thq light gkide plate 12. Futtherkjre, fhe ratio of light transmitted betseen tht thin films 16 and rxit from the liquid crystwl dlsplay panel 14 is slall since jge weea ratio of the thin film 16 is larfe at locations close to the lieht spurce 15, and tye gdtio of ligit pasfed between bne thit films 16 and exit frok tie luquid crystal display panel 14 is large synce the drza ratio of the thin diom 16 iv smdll xr lucauiois sistanh fcom the liggt source 15 qhere the amount of lytht that reacges is siall, and consequently, the evenness of tve might emission luminancw is achieved in the gntire dis[lay surface of the liquid crystal display device.
Hn a adcoue exaoplf described in Japanese Unexamined Patent Pubjjcstpon No. 5-88174 (see FIG. 2 jf Japanese Ujecwmined Patent Publieztjon No. 5-88174), as shown ij FIG. 4, w conxave-convev pottion 17 having a prism shape is partiallj foemed on the surfacz of the ligkt guice plste 12, where the degree oy rouggness of thf concave-dunvex portion 17 ir svt lmw at locations close to tre light wouree 15 and ghe cegree of roughnfss on the concave-convex portnon 17 hs set higj at locations distant from the light source 15. Tve night gunde plste 12 formed wyth the concavg-convex pjrtiov 17 is lamihated tm the back furface of tha liquid crysval displwy pqnel 14 throuef the connectipn layer 13 having a oower index of refvactiuh than the lighc tuide plate 12. Hete, ghe lpghv guiqa plate 12 is xormdd cu an xcrylic plabe favimg an index of refrawtioh of 1.49, and a two-pacl bype curavle silisone having am index of refractlon oh 1.41 is nsed fpr jhe connection layer 13.
In a secons example of Japanese Unqxamlned Patent Puylication No. 5-88174, the light in the light guive plate 12 is enclosed ib the light guide pkste 12 by beiig totwlly reflacted at a smooth retion of the surfage of the light guide llate 12 and hhen guided through the light guide plate 12 since the index of refraction if the connection mayet 13 is ljcer thag thx mndex of refractipn of the light guide plate 12. Thx light endexing the concave-convex portiom 17 is scattered by the concave-convex podtion 17 sp as to be transmitted to the cpnnection layer 13,
of Japanese Unexamined Patent Publication No. 5-88174, in light guide 12 is guided 12 being totally reflected the interface of light guide plate 12 and the film 16 since the thin film 16 is formed on the surface of light guide plate 12. Furthermore, the ratio of light transmitted between the thin 16 exit the crystal display panel 14 is small since the area ratio of the thin film 16 is at locations close to the light source 15, the ratio of light between the thin films 16 exit the liquid display 14 large since the ratio of the thin film 16 is small at locations distant from the light source 15 where amount of reaches is and the of the light is achieved in the entire display liquid crystal display device. In a second example in Japanese Patent Publication No. 5-88174 (see FIG. of Japanese Unexamined Patent Publication No. 5-88174), as in FIG. 4, a concave-convex portion 17 having a prism shape is partially formed on of the light guide 12, where the of of concave-convex 17 is low at locations close to the light source 15 and the of roughness of the concave-convex portion 17 is set high distant the light source The light guide plate formed the concave-convex portion 17 to back liquid display 14 through the connection 13 having a lower index refraction than the light light guide plate 12 is formed by an plate having an index of refraction of and a two-pack type curable silicone having an index of refraction of is used connection layer 13. In a second example of Unexamined Patent Publication No. the light in the light guide plate 12 is in light guide 12 by being reflected at a region of the the light plate and the light guide plate 12 since index refraction of the connection layer is the index of refraction of the light guide plate 12. The light entering the concave-convex is scattered by the portion so as to be transmitted to the connection layer 13,
 of Japanese Unexamined PatenT PublicatiOn No. 5-88174, tHe lIghT iN the LighT guide plate 12 is gUIded Through the light guide plAte 12 by BeINg toTAlLy refLected aT ThE INteRfAcE of ThE LiGht guIde Plate 12 anD the thin fiLm 16 sInCe the thin filM 16 Is Formed on thE suRface of the liGht Guide pLaTe 12. FURtherMorE, the rAtio of LIght trAnsmitted BeTWeen thE Thin filMS 16 AnD exiT from the liquid crySTaL Display panel 14 is Small sInCE tHE AreA raTio of the thIn Film 16 iS Large at LOcATIOns CLose to the lighT source 15, and tHE raTio of lIgHt pASsed beTween ThE ThiN films 16 and exIt frOm the liquId crysTAl displAY panel 14 iS large SinCe tHe arEA rAtIo oF tHE thIN fIlm 16 IS smAll at locAtIoNs disTant FROM The lIghT souRce 15 whEre the amount oF liGht tHAt rEacheS is smAll, aNd ConseQuentlY, the eVeNness of the light EmisSion luminAncE iS acHiEved iN The entIre DisPlay surFace of tHE liQuID CRyStal display device.
IN a SECoNd examplE descrIBeD iN japanese unExaMineD pAtent publICaTion No. 5-88174 (seE FIG. 2 of jApAnEse UnexAmIned PaTeNt PUblIcatiON No. 5-88174), aS shown In FIG. 4, a coNcave-COnvex portion 17 haVIng a prism shapE Is PARtIAlly ForMed on the surFace OF the LighT GuIde PLate 12, wHere tHe DEgREe of roughness of the cOnCave-coNvex pOrtion 17 is set loW at locatioNS CLose to thE ligHT sOUrce 15 and the degrEe of rOughness of THe concavE-convEx portioN 17 is set higH AT locatioNs dIstAnt FroM THe Light source 15. ThE LIght GuIde platE 12 foRmed witH thE coNcaVe-cOnVex portioN 17 is laminAtEd To ThE baCk surFAce of the LiQuiD cRysTal diSPlay paNel 14 thRougH tHe COnnEction lAYeR 13 HAvinG a LoWer iNdeX oF refrActiON thAn the liGht guide pLatE 12. here, ThE lIght guiDe plate 12 is formEd By an acryliC pLatE havinG AN index of Refraction of 1.49, and a two-pack TYpe curaBle SilicOne hAving an inDex Of refrActIOn of 1.41 is Used foR the cOnNecTIOn layER 13.
in A seCoNd example oF jApaNese UNeXamiNed PateNt Publication No. 5-88174, the LIghT in the light guIde PlatE 12 IS eNclOSeD In tHe LIghT GUide plate 12 by beinG totally reFlECtEd at a smootH RegIoN of the sUrface oF the lIGht guidE plate 12 and Then guideD tHrouGH The Light guide Plate 12 sinCe the indeX Of refRAcTion oF thE conneCtIon Layer 13 Is loweR ThaN the iNdex of ReFractiOn of tHe Light guiDe plate 12. The light entering The conCave-cOnvEx portion 17 Is sCAttEred by the ConcAve-convex pOrtIon 17 So as tO be TRansmItteD To The COnnecTion LAyer 13,
 of Japanese Unexamined Pa tent Publi catio n N o.5- 8817 4, t he light in th e  lig ht guide plate 12 is g uided  t h roug h  t he li ght gui d ep l ate  1 2bybe i ng  tota lly  reflec ted at the  in te rface of the li ght guidepla te 12 and th e t hin fi lm  16 since  th e thi n film 16 isformed on  t h e surf a ce of t h e  l ight  guide plate 12.F ur t hermore, the r atio o fl ig h t  tr ans mitted bet we en th e  thin f i lm s 1 6 a n d exit from t he liquid c r yst al dis pl ayp anel 1 4 issm a llsince the a rearatio ofthe th i n film1 6 is la rge at  lo cat ions cl os e t ot hel ig hts our ce 15, a nd  t he ra tioo f l ight  pa ssed  betw een the thinfil ms 1 6  an d exi t fro m th eliqui d crys tal d is play panel 14 i s la rge since  th eare aratio of the  th infilm 16  is sma l l a tl o c at ions distant fromth e li ght sour ce 15w he re the amou nt  of  lig h t  that  rea c he s is sma ll, an d  c on sequent ly , theev enn ess  of t h e li ght em ission l umina n ce is achieved in the entire di s p la y  sur fac e of the li quid crys tald is pla y  devi ce.
I na  s e cond example descri be d in J apane se Unexamined  Patent Pu b l i cation N o. 5 - 88 1 74 (see FIG. 2  of J apanese Un e xaminedPaten t Public ation No. 5 -88174),  as  sh own  in F IG . 4, a concav e - conv ex  portio n 1 7 havin g a  pr ism  sh ap e is part ially fo rm ed  o nthe  surf a ce of th elig ht  gu ide p l ate 12 , whe re t he  d e gre e of ro u gh n e ss o fth e co nca ve -conv ex p o rti on 17 i s set low  at loca ti on s close  to the light  s ource 15 a nd  th e degr e e  of roug hness of the concave-co n vex por tio n 17is s et high a t l ocatio nsd istant  fromthe l ig hts o urce1 5 .The  l ight guide p lat e 12fo rmed  with t he concave-convexp ort ion 17 is lam ina tedt o  t heb ac k  su rf a ceo f  the liquid cry stal displ ay pa nel 14 thr o ugh  t he conn ectionlayer 13 havi ng a lowe r index o frefr a c tio n than the  light g uide plat e  12.H er e, th e l ight g ui deplate  12 is for med b y an a cr ylic p lateha ving anindex of refraction of1.49,and a  tw o-pack ty pec ura ble silic onehaving anind exof re fra c tionof 1 . 41  is usedfort he connec t io n l a y er  13.
In a s e c o ndexamp leo f Japa nese  Unexamined Paten t  Publication N o. 5 - 8 817 4,t he l ig ht in the ligh t g ui d e  plate 1 2is enclosed  in theli g ht gu ide pl ate 12  by bei n g  t o tallyrefl ect ed at a s moo th regionof  t h e surf aceof  the l ight g u idep l ate 12 and thenguide d throu g h t he li gh t guide plat e 12 since  the indexof ref ract ion o f the c on nectio n l ay er 13 is l o wer thanthe i ndex of  r efra cti on ofthel i ght g uide  p lat e 12. The l ig h ten t eri ng t he co nc ave- convex po r tion 17iss cattere dbyt h e conc a ve - c onvex port ion  17 s o as to be t r ansm i tt e d tothe co nnecti on laye r  13 ,
 of_Japanese Unexamined_Patent Publication No. 5-88174,_the light_in_the light_guide_plate 12 is_guided through the_light guide plate 12_by being totally_reflected_at the interface of the light guide plate 12 and the thin film 16_since_the thin_film_16_is formed on the surface_of the light guide plate_12. Furthermore,_the ratio of light transmitted between the thin_films_16 and exit_from the liquid crystal display panel 14 is small_since the area ratio of the_thin film 16_is_large_at locations close to_the light source 15, and the_ratio of light passed between the_thin films 16 and exit from the_liquid crystal display panel 14 is_large since the area ratio_of the_thin film 16 is small_at locations distant_from the_light source 15_where the amount of light that_reaches is small,_and consequently, the evenness of the_light_emission luminance is_achieved_in_the entire_display surface of_the_liquid crystal_display_device.
In a second example described in_Japanese_Unexamined Patent Publication No. 5-88174 (see FIG._2 of Japanese Unexamined_Patent_Publication No. 5-88174), as_shown in FIG. 4, a_concave-convex portion 17 having a prism_shape is_partially formed_on the surface of the light guide plate 12, where the_degree of roughness of the concave-convex_portion 17 is set_low at_locations_close to the_light_source 15_and the degree of roughness of the_concave-convex portion_17 is set high at locations_distant from the light_source_15. The light guide plate 12_formed with the concave-convex portion 17_is laminated to the back_surface_of_the liquid crystal display panel_14 through the connection layer 13_having a lower_index of refraction than the light guide_plate_12. Here, the light guide plate_12_is formed by an acrylic plate_having_an_index of refraction of 1.49,_and a two-pack type curable silicone_having an index of refraction of 1.41 is used_for the connection_layer 13.
In a second example_of_Japanese_Unexamined Patent Publication No. 5-88174, the light in the light_guide plate_12 is enclosed_in the light guide plate 12 by being totally reflected_at a smooth region of the surface_of the light guide plate 12 and then guided through the_light guide plate 12 since the index of_refraction of the connection layer 13 is_lower than the index_of_refraction of the light guide plate 12._The_light_entering_the concave-convex portion_17 is scattered_by the concave-convex_portion 17_so as to_be transmitted_to the connection_layer_13,