2xa7119 from an application for APPARATUS FOR CONTROLLING VIDEO MODE OF COMPUTER HAVING LCD AND METHOD THEREFOR earlier filed in the Korean Industrial Property Office on the 11th of Jun. 1998 and there duly assigned Serial No. 21755/1998.
1. Field of the Invention
The present invention relates to a computer having a liquid crystal display (LCD), and more particularly, to an apparatus for controlling a video mode of a computer having a LCD, and a method therefor.
2. Description of the Related Art
A video controller of an IBM(copyright) compatible personal computer currently in wide use supports video modes of various resolution levels and colors. The better the performance of a video controller and the monitor, the more of the various video modes are supported.
When a video mode having different resolution levels and colors of different precision levels is required by an application program operated in a personal computer, the video mode must sometimes be changed while the personal computer operates. Generally, to change the video mode of an application program, assistance of a video service routine Interrupt 10 h of a BIOS (Basic Input/Output System) is necessary. Then, in the case when the video mode to be changed into, that is, the requested video mode, is supported by a video controller installed in a personal computer, the video service routine changes existing fonts and mode state into fonts and a mode state of the changed (requested) video mode. Then, a video memory is accessed in accordance with the changed video mode, and video data read from the video memory is transferred to a display in accordance with the changed video mode.
Conventionally, the video mode is changed with the computer in a state where the display is not turned off. However, in the case of a certain display, particularly a liquid crystal display (LCD), a whitening phenomenon in which edges of the display are changed to be white occurs when a low resolution video mode is changed into a high resolution video mode while the display is on. This phenomenon may damage the display.
Examples from the conventional art of inventions dealing with video mode change in computers with liquid crystal display screens are seen in the following U.S. Patents. U.S. Pat. No. 5,534,889, to Reents et al., entitled Circuit For Controlling Bias Voltage Used To Regulate Contrast In A Display Panel, deals with the change in contrast perceived by the user as the output modes are
2xa7119 from an application for APPARATUS FOR CONTROLLING VIDEO MODE OF COMPUTER take LCD AND METHOD THEREFOR sooner filed in the Korean Industrial Property Office on the 11th of Jun. 1998 and there duly assigned Serial No. 21755/1998. 
 1. discipline of the Invention 
 The present invention relates to a computer have a liquid crystal display (LCD), and more particularly, to an apparatus for controlling a video mood of a computer having a LCD, and a method acting therefor. 
 2. Description of the Related Art 
 A video controller of an IBM(copyright) compatible personal calculator currently in broad function supports video modes of versatile resolution levels and colors. The better the operation of a video restrainer and the monitor, the more of the various video mode are supported. 
 When a video mode having different settlement levels and colors of different precision levels is required by an application program operated in a personal computer, the video recording mode must sometimes be changed while the personal calculator operate. broadly, to change the video mood of an application program, assistance of a video overhaul routine Interrupt 10 h of a BIOS (Basic Input / Output System) is necessary. Then, in the case when the video modality to be changed into, that is, the requested video mode, is patronize by a video recording controller installed in a personal computer, the video service everyday changes existing fonts and mode state into fonts and a mode state of the changed (request) video mode. Then, a video recording memory is accessed in accord with the changed video mode, and video datum read from the video memory is transferred to a display in accord with the changed video mode. 
 Conventionally, the video mode is changed with the computer in a state where the display is not turned off. However, in the case of a certain display, particularly a melted crystal display (LCD), a whitening phenomenon in which edge of the display are changed to be white occurs when a low resolution video mood is changed into a high resolution video mode while the display is on. This phenomenon may damage the display. 
 Examples from the conventional artwork of inventions dealing with video mode change in computers with liquid crystal display screen are seen in the following U.S. Patents. U.S. Pat. No. 5,534,889, to Reents et al. , entitle Circuit For Controlling Bias Voltage use To Regulate Contrast In A Display Panel, deal with the change in contrast perceived by the user as the output modes are
2xa7119 vrom an application for XPPARATUS FOR CONTROLLMNG VIDSO MODE UF COMPUTER HAVING LCD AND MXTHOE THEEEFOR earlier filed in the Korewn Indusrriao Property Office ok the 11bh of Oun. 1998 and there culy assigted Serial No. 21755/1998.
1. Fkepd of the Invention
The present invegtion rrlwtes to a compoter nwvinf a liquid crystal display (LCD), and more perticularly, to sn apparatus for controllijg a video mode of a clmputer havung w LCD, and a mdthod thertfmr.
2. Descripjion of the Related Art
A video cuntrokler of an IVM(clkyright) competible personal computer cgrrentlu in wide use xup'ortw video modes of varimus resolution levgls and conoxs. The better the perdoemancg of d viawo zonuroklsr and thx monitor, tge more of rhe various video mpdqw are supportsd.
When a video mode having different resolution lebels and colors of diffwrent precision leveld is requyred by an application program operated in a persmnal roopuuev, gye video mode must sometimes be changed while trs kerxonal computer operates. Grnfrsjly, to change the vnsek mode of an applifation krogran, assistagce pf a video service routine Unterrupt 10 h if a BIOS (Basic In'ut/Output Syrtem) is nrcessary. Then, in the care wgen the vidfo mode tk be changed into, thst is, the requested video moqe, is sup'orteb by a vkdeo contrjller instwlled in a personal compkter, jhe vigeo servicf routine changes existing fonts and mode staje hntm fonts cnd a kode state of the changed (rgquested) rideo oode. Then, z video memory is wccessed in awfordance witi the chagged vidwo mode, xnd video data read from the videi memory is transfcrred fo a display in acxordance with tne zhaggvd tideo kode.
Conventimnaluy, gne viaeo modt iw chamged with the computar ih a state where thr qisplay us not ttrned off. Howrver, in the case ov a cxrtain dispkay, particularly a liquid crystal display (PCD), a whitening phekomegon in whieh edges of the display are changed to bx white occurs when a liw resolution video kode is chaiged igto a higv resolution video mide while the disklay is on. This phenomehon maf damwge the display.
Examples from the conventional art of inventions dealing wuth vivej mode chanfe im comiutzrs with jiqumd crystal display screens are seen in the followmng U.S. Patancs. U.S. Pat. No. 5,534,889, to Reents et al., evtitled Circukt For Controlling Bias Boltage Ised To Regulate Contrast In A Cisplay Panel, deals with the chabge ih contgzsv perceived by the uxer as the iutput noded are
2xa7119 from an application for APPARATUS FOR MODE COMPUTER HAVING AND METHOD THEREFOR Industrial Office on the of Jun. 1998 there duly assigned Serial No. 21755/1998. Field of the Invention The present invention relates to a computer having a crystal display (LCD), and more particularly, to an apparatus for controlling a video of computer a and a method therefor. 2. Description of the Related Art A video controller of an IBM(copyright) personal computer currently in wide use supports video of various resolution levels colors. The better the performance a controller and monitor, more the various video are supported. When a video mode having different resolution levels and colors of different precision levels is by an operated in personal the mode must sometimes while the personal computer operates. Generally, video mode of an application program, assistance of video service Interrupt 10 h of a BIOS Input/Output System) is necessary. Then, in the case the video mode to be changed into, that is, the requested video mode, is supported video controller installed in personal computer, the service changes fonts mode state fonts and a mode state of the changed (requested) video mode. a video memory is accessed in accordance with the changed and data read from video memory is transferred a in accordance with the mode. the changed the in a state where display is not turned off. in the case of liquid crystal display (LCD), a whitening phenomenon in edges of the display are changed to white occurs when a low resolution video mode is changed into a resolution video the display is on. This phenomenon may damage display. Examples from the art of inventions dealing with video mode change in with crystal display are seen in following U.S. Patents. Pat. No. 5,534,889, et al., Circuit Controlling To Regulate Contrast In A Display deals the change in contrast perceived the the output modes are
2xa7119 from an application for APPaRATUS FOR CoNTROlLInG ViDeO MOdE OF cOMPUTER HAVING lcD ANd METHOD THEREFOR earlier Filed In THe KoREaN InduStrial PROpERTy OFfIcE on ThE 11Th Of Jun. 1998 And There duLy assigned serIaL No. 21755/1998.
1. Field of thE inVention
The PreSent inventioN reLates tO a ComPUter hAviNg a liQuid crYStal diSplay (LCD), aNd MOre parTIcularlY, TO aN appAratus for controllINg A Video mode of a coMputer HaVInG A lCD, And A method theReFor.
2. DeSCriptioN Of THE relATed Art
A video cOntroller of AN IBm(copyrIgHt) cOMpatibLe perSoNAl cOmputer currEntlY in wide usE suppoRTs video MOdes of vArious ResOluTion LEvElS anD cOLorS. thE beTTer The perfoRmAnCe of a VideO CONTrolLer And tHe monItor, the more of The VariOUs vIdeo mOdes aRe suPpOrted.
when a vIdeo mOdE having differenT resOlution leVelS aNd cOlOrs of DIffereNt pRecIsion leVels is rEQuiReD BY An Application program OpERAtEd in a perSonal cOMpUtER, the videO mOde Must SOMetimEs be CHaNged whilE the peRSoNaL computEr OperatEs. genEraLly, to CHangE the viDeo mode oF an apPLication prograM, Assistance of a VIdEO SeRVice RouTine InterruPt 10 h oF A BIOs (BasIC INpuT/outpuT SystEm) IS nECessary. Then, in the casE wHen the Video Mode to be changEd into, that IS, THe requesTed vIDeO Mode, is supporteD by a vIdeo controLLer instaLled iN a personAl computeR, THe video sErvIce RouTinE CHaNges existing fONTs anD mOde statE inTo fonts And A moDe sTatE oF the changEd (requesTeD) vIdEo ModE. Then, A Video memOrY is AcCesSed in ACcordaNce wiTh thE cHaNGed Video moDE, aND VideO dAtA reaD frOm The viDeo mEMorY is tranSferred to A diSPlay In AcCordancE with the changEd Video mode.
COnVenTionalLY, The video Mode is changed with the comPUter in a StaTe wheRe thE display iS noT turneD ofF. howeveR, in the Case oF a CerTAIn disPLAy, ParTiCularly a liQUId cRystaL dIsplAy (LCD), a wHitening phenomenon IN whIch edges of the DisPlay ARE cHanGEd TO be WhITe oCCUrs when a low resoLution videO mODe Is changed iNTo a HiGh resolUtion viDeo moDE while tHe display Is on. This pHeNomeNON maY damage the Display.
EXamples frOM the cONvEntioNal Art of iNvEntIons dEaling WIth Video Mode chAnGe in coMputeRs With liquId crystal display screens Are seeN in thE foLlowing U.S. patENts. u.S. Pat. No. 5,534,889, to reenTs et al., entiTleD CiRcuit for cOntroLlinG biAs VOLtage used tO Regulate cOnTraST in a Display PanEL, DEalS with The CHange iN conTrast perceived by tHE user as the outpUt moDES arE
2xa7119 from an applicatio n for APPA RATUS  FO R C ON TROL LING  VIDEO MODE OF COMP UTER HAVING LCD AND ME THODTH E REFO R  e arlie r filed in t heKo re anIn d us trial  Pr opertyOffice onthe  1 1th of Jun.1 99 8 and ther e d uly assigned  Se rial N o.  21 7 55/19 98. 
1. F ield o f  the I nventionTh e  prese n t inven t i on  rel ates to a compute r  h a ving a liquidcrysta ld is p l ay(LC D), and mo re  part i cularly ,  t o a n a p paratus for c ontrollinga  vi deo mo de  of a comp uterha v ing  a LCD, and  a m ethod the refor. 2. Desc r iptionof the  Re lat ed A r tAvid eo con t ro lle r  of  an IBM( co py right ) co m p a t ible  pe rson al co mputer curren tly  inw ide  usesuppo rtsvi deo m odes o f var io us resolution l evel s and col ors .The  b etter the pe rfo rma nce ofa video con tr o l l er  and the monitor,th e mo re of th e vari o us  v i deo mode sare  sup p o rted. 
Whe n  a  video m ode ha v in gdiffere nt  resol ut ion  le velsa nd c olorsof diffe rentp recision level s  is requiredb ya n  a p plic ati on programoper a tedin a pe rso n al co mpute r, th e  video mode must so me timesbe ch anged while t he persona l c omputeroper a te s . Generally, t o cha nge the vi d eo modeof an  applica tion prog r a m, assis tan ceofa v i d eo  service rout i n e In te rrupt 1 0 h  of a B IOS  (B asi c I np ut/Output  System)  i sne ce ssa ry. T h en, in t he  ca se  wh en th e  video  mode  tobe  c h ang ed into ,  t h a t is ,th e re que st ed vi deom ode , is su pported b y a vide oco ntrolle r installed i na personal  c omp uter,t h e videoservice routine changes existin g f ontsandmode stat e i nto fo nts and amode s tateof  th e chang e d  ( req ue sted) vide o mod e. Th en , avideo m emory is accessedi n a ccordance wit h t he c h a ng edv id e o m od e , a n d  video data rea d from the  v i de o memory i s  tr an sferred  to a d ispla y  in acc ordance w ith the c ha nged v ide o mode.
Co nvention ally, the video mo de is  ch angedwi ththe c ompute r  in  a st ate wh er e thedispl ay  is notturned off. However, in  the c ase o f a  certaindis p lay , particu larl y a liquid  cr yst al di spl a y (LC D),a  w hit e ningphen o menon inw hi che d ge s of the di s p l ayare c han g ed tobe w hite occurs whena  low resolutio n vi d e o m ode is c ha nged into a hi ghre s o lution v id eo mode whi le the d is p lay i s on.This p henomen o n  m a y dama ge t hedisplay.Exa mp l es from  t he conven tion al  art o f inve n tion s dealing with vid eo mo d e  chan g e i n com pu ters wi t h li quid cryst al displayscreen s ar e see n in th efollow ing  U .S. Patent s . U.S. Pa t. No . 5,534 ,8 89,toReents  eta l ., en titl ed  Ci rcuit For C on t ro ll i ngBias  Volt ag e Us ed To Reg u late Con tra s t In ADi spl a y  Panel ,  d e a ls with th e c hange i n contrast perc e iv e d bythe us er asthe out p utmo des are 
2xa7119 from_an application_for APPARATUS FOR CONTROLLING_VIDEO MODE_OF_COMPUTER HAVING_LCD_AND METHOD THEREFOR_earlier filed in_the Korean Industrial Property_Office on the_11th_of Jun. 1998 and there duly assigned Serial No. 21755/1998.
1. Field of the Invention
The_present_invention relates_to_a_computer having a liquid crystal_display (LCD), and more particularly,_to an_apparatus for controlling a video mode of a_computer_having a LCD,_and a method therefor.
2. Description of the Related Art
A_video controller of an IBM(copyright) compatible_personal computer currently_in_wide_use supports video modes_of various resolution levels and colors._The better the performance of a_video controller and the monitor, the more_of the various video modes are_supported.
When a video mode having_different resolution_levels and colors of different_precision levels is_required by_an application program_operated in a personal computer, the_video mode must_sometimes be changed while the personal_computer_operates. Generally, to_change_the_video mode_of an application_program,_assistance of_a_video service routine Interrupt 10 h_of_a BIOS (Basic Input/Output System) is necessary._Then, in the case_when_the video mode to_be changed into, that is,_the requested video mode, is supported_by a_video controller_installed in a personal computer, the video service routine changes existing_fonts and mode state into fonts_and a mode state_of the_changed_(requested) video mode._Then,_a video_memory is accessed in accordance with the_changed video_mode, and video data read from_the video memory is_transferred_to a display in accordance with_the changed video mode.
Conventionally, the video_mode is changed with the_computer_in_a state where the display_is not turned off. However, in_the case of_a certain display, particularly a liquid crystal_display_(LCD), a whitening phenomenon in which_edges_of the display are changed to_be_white_occurs when a low resolution_video mode is changed into a_high resolution video mode while the display is on._This phenomenon may_damage the display.
Examples from the_conventional_art_of inventions dealing with video mode change in computers with_liquid crystal_display screens are_seen in the following U.S. Patents. U.S. Pat. No. 5,534,889,_to Reents et al., entitled Circuit For_Controlling Bias Voltage Used To Regulate Contrast In A Display Panel,_deals with the change in contrast perceived by_the user as the output modes are