201102704 六、發明說明： 【發明所屬之技術領域】 本發明係有關於一種顯示系統及光寫入方法，特別係 關於一種包括膽固醇液晶面板的顯示系統及相關的光寫入 方法。 【先前技術】 膽固醇液晶（cholesteric liquid crystal)面板是一種新型 的顯示器，膽固醇液晶具有雙穩態的特性，即在不施加電 場的情況下，具有可表現亮態的反射態(planar state)和可表 現暗態的穿透態（focal-conic state)兩種不同的穩定狀賤用 以記錄影像，可以有效降低耗電量。目前一種可能的應用 是用於電子紙(e-Paper)的領域，傳統上，電子紙通常是使 用捲對捲製程(roll-tQ-roll prQcess)來製作的，以膽固醇液晶 顯示器為例，可用電子元件驅動膽固醇液晶顯示器的= 素’但是電驅動寫入晝面的方式受限於製程能力，解析； 僅能達到網印電極約3Q dpi (dQt per ineh)的高良率條件^ 規格，因此為了提高解析度，進而發展的是光寫入技術 (Ph〇t〇-addressing)，利用調變光照的能量，改變膽固 液晶反射率對電場的曲線，進而寫人晝面。然而，目°的 =入：：也具有以下缺點：目前所用的點光源的掃瞒速 度k，無法快速地連續寫入，而所用的面 ，調整，，此外，目前的光寫人技術在晝面 需利用尚電場將整個晝面初始化（initiaUze)到其，、 再進行後續寫入的動作，此初始化電場對微胞化：：固醇 201102704 液曰曰顯不器而5約為16〇伏特，所對應的電源供應裝置造 價高且使整個顯示襄置無法小型化，造成耗電量的浪費及 應用層面的受限。 因此’需要-種能夠根據影像調整的光源及光寫入方 法，讓使用上述光寫入方法的顯示系統具有根據影像快速 地寫入的能力，以冑升顯示品質，i達到降低《電量及小 型化的目的。 【發明内容】 本發明提出-種顯示系統及使用光寫入方法的顯示系 統，上述光寫入方法的光源均勻性佳且能夠被局部地控 制，根據影像資料的尺寸和内容，搭配不同的掃描區域、 時間和順序，即可達到降低耗電量及提高顯示品質的目的。 本發明之一實施例提供一種顯示系統，包括顯示裝置 以及光寫入裝置。顯示裝置更包括基板、兩電極層、膽固 醇液晶層以及光吸收層，其中第一電極層係為透明電極， 且該透明電極係形成於基板之上；膽固醇液晶層係設置於 兩電極層之間，並根據不同的光源能量和電極層所施加之 外加電場而具有不同的光學狀態；光吸收層係設置於膽固 醇液晶層與第二電極層之間，用以吸收光源能量並改變膽 固醇液晶層的光電狀態。光寫入裝置更包括平面光源以及 光柵裝置，用以將影像資料寫入上述顯示裝置，其中平面 光源用以作為光寫入裝置的光源，並用以控制上述顯示裝 置的光寫入範圍；光栅裝置係設置於平面光源和顯示裝置 之間’用以調整光源的能量，並用以控制上述顯示裝置的 201102704 光寫入範圍。 本發明之另一實施例提供一種適用於顯示系 ==化，影像寫入程序，其中初始化 私序更包括施加第-電場於顯示裝置之兩電極 ===固醇液晶層的先學狀態。影像資料 =入私較包料力α場於兩電極層之間， =光拇裝置調控平面卿^ Φ 【實施方式】 亍季圖示更詳細地說明依據本發明之實施例之顯 人方法，在本發明之各實施财 表不相同或類似的元件。 ==顯示本發明之—實施例之顯示純 統1包括顯示裝置n、伞 控制裝置13，裝置12以及控制裝置13。 12，而根據衫像負料控制顯示裝置11和光寫入裝置 線14穹工！裝置13藉著光寫入裝置12將受調控的寫入光 、笑冩入顯示襞置11。 之顯示裝^2和第2b圖顯示本發明—實施例之顯示系統11 層23分別以和2b’其中顯示裝置2&和2b的膽固醇液晶 有基二具學狀態。顯示裝置2 &和2 b分別具 收層…兩電_^ =、膽固醇液晶層23以及光吸 其中電極U可Λ 分別電性輛接於控制裝置13， 為透明電極，且電極22係形成於基板21之 6 is] 201102704 上。膽固醇液晶層23設置於兩層電極22和24之間，並根 據不同寫入光線14的能量和電極層22和24之間所施加之 外加電場而具有不同的光學狀態。光吸收層25用以吸收寫 入光線14的能量並改變膽固醇液晶層23的光電狀態。當 膽固醇液晶層23的膽固醇液晶分子處於可表現亮態的反 射態(planar state)的穩定態時，如顯示裝置2a的膽固醇液 晶層23的膽固醇液晶分子的狀態，膽固醇液晶分子的螺旋 軸(helix狀⑷會垂直於基板21，而能反射用以顯示的入射201102704 VI. Description of the Invention: [Technical Field] The present invention relates to a display system and an optical writing method, and more particularly to a display system including a cholesteric liquid crystal panel and an associated optical writing method. [Prior Art] A cholesteric liquid crystal panel is a new type of display. The cholesteric liquid crystal has a bistable characteristic, that is, a planar state capable of expressing a bright state and an optical field without applying an electric field. Two different stable states of the focal-conic state are used to record images, which can effectively reduce power consumption. One possible application is currently used in the field of electronic paper (e-Paper). Traditionally, electronic paper is usually produced by roll-tQ-roll prQcess. For example, a cholesteric liquid crystal display is available. The electronic component drives the CMOS of the cholesteric liquid crystal display, but the way of electrically driving the 昼 surface is limited by the process capability and resolution; it can only reach the high yield condition of the screen printing electrode of about 3Q dpi (dQt per ineh), so Improve the resolution, and then develop the optical writing technology (Ph〇t〇-addressing), using the energy of the modulated illumination, changing the curve of the reflectivity of the bile liquid crystal to the electric field, and then writing the face. However, the target = in: also has the following disadvantages: the broom speed k of the point light source currently used cannot be continuously written continuously, and the surface used, adjusted, and, in addition, the current optical writer technique is The surface needs to be initialized (initiaUze) to the entire surface by using the electric field, and then the subsequent writing action is performed. The initializing electric field is micro-cellular: sterol 201102704 liquid sputum display and 5 is about 16 volts. The corresponding power supply device is expensive and the entire display device cannot be miniaturized, resulting in waste of power consumption and limited application level. Therefore, 'there is a need for a light source and optical writing method that can be adjusted according to the image, so that the display system using the above optical writing method has the ability to quickly write according to the image, so as to increase the display quality, i achieve lowering the "electricity and small size". Purpose. SUMMARY OF THE INVENTION The present invention provides a display system and a display system using the optical writing method. The light writing method has good light source uniformity and can be locally controlled, and is matched with different scans according to the size and content of the image data. The area, time and sequence can achieve the purpose of reducing power consumption and improving display quality. An embodiment of the present invention provides a display system including a display device and an optical writing device. The display device further includes a substrate, a two-electrode layer, a cholesteric liquid crystal layer and a light absorbing layer, wherein the first electrode layer is a transparent electrode, and the transparent electrode is formed on the substrate; the cholesteric liquid crystal layer is disposed between the two electrode layers And having different optical states according to different light source energies and an applied electric field applied by the electrode layer; the light absorbing layer is disposed between the cholesteric liquid crystal layer and the second electrode layer for absorbing the light source energy and changing the cholesteric liquid crystal layer Photoelectric state. The optical writing device further includes a planar light source and a grating device for writing image data to the display device, wherein the planar light source is used as a light source of the optical writing device, and is used for controlling the optical writing range of the display device; The device is disposed between the planar light source and the display device to adjust the energy of the light source and is used to control the optical writing range of the 201102704 of the display device. Another embodiment of the present invention provides a video encoding program suitable for display system, wherein the initializing the private sequence further includes applying a first electric field to the two electrodes of the display device === the precursor state of the sterol liquid crystal layer. Image data=increase than the material force α field between the two electrode layers, = optical thumb device control plane clear ^ Φ [Embodiment] The season diagram illustrates the method according to the embodiment of the present invention in more detail, Components that are different or similar in the implementation of the present invention. The display system 1 of the embodiment of the present invention includes a display device n, an umbrella control device 13, a device 12, and a control device 13. 12, and according to the negative control device 11 and the optical writing device line 14 are completed! The device 13 causes the controlled write light and the smile to enter the display device 11 by the optical writing device 12. The display device 2 and the 2b diagram show that the display system 11 layer 23 of the present invention-embodiment has a base state of 2b' and the cholesteric liquid crystals of the display devices 2& and 2b, respectively. The display devices 2 & and 2 b respectively have a layer ... two electric _ ^ =, the cholesteric liquid crystal layer 23 and the light absorbing liquid electrode U Λ are electrically connected to the control device 13 respectively, which are transparent electrodes, and the electrode 22 is formed On the substrate 21, 6 is] 201102704. The cholesteric liquid crystal layer 23 is disposed between the two layers of electrodes 22 and 24 and has different optical states depending on the energy of the different writing ray 14 and the applied electric field applied between the electrode layers 22 and 24. The light absorbing layer 25 serves to absorb the energy written into the light 14 and change the photoelectric state of the cholesteric liquid crystal layer 23. When the cholesteric liquid crystal molecules of the cholesteric liquid crystal layer 23 are in a stable state of a planar state capable of expressing a bright state, such as the state of the cholesteric liquid crystal molecules of the cholesteric liquid crystal layer 23 of the display device 2a, the helix axis of the cholesteric liquid crystal molecules (helix Shape (4) will be perpendicular to the substrate 21, and can reflect the incident for display
環境光(ambient incident light)26，並且反射環境光26,就會 被觀察者察覺而涊定區域B1、尽2和&為亮區。當膽固醇 液晶層23的膽固醇液晶分子吸收寫入光線14的能量而處 於可表現暗態的穿透態state)的穩定態時，如顯 示裝置2b的膽固醇液晶層23的膽固醇液晶分子的狀態， 膽固醇液晶分子的螺旋軸則會傾向平行於基板但方向不定 地分布，使入射環境光27大部分穿透，觀察者無法察覺由 區域A!、、和As的膽固醇液晶所反射的入射環境光27而 認定區域々和A3為暗區，其t吸收層25的顏色可為 黑色以吸收穿透的散射光而顯示暗態。 第3圖顯示本發明一實施例的顯示系統3的顯示裝置 2c和光寫入裝置3a。顯示系統3包括顯示褒置及以及 寫入裝置3a。顯示裝置2c包括基板21、兩電極声2 膽固醇液晶層23以及光吸收層25 1電極層^和^分 別電性墟於控制裝置13，其中電極22可為透明電極: 係形成於基板21之上。膽固醇液晶層23係設# 層22和24之間’並根據不同寫人光線14的能量和電極層 201102704 - 22和24之間所施加之外加電場而具有不同的光學狀態。 光吸收層25 ’用以吸收寫入光線14的能量並改變膽固醇 液晶層23的光電狀態。光寫入裝置3a包括均勻發光的平 面光源31以及光柵裝置32。平面光源31用以作為光寫入 裝置3a的光源並通過光栅裝置32而產生寫入光線14，並 藉寫入光線14將影像資料寫入顯示裝置2c，其中平面光 源31係為可程式化控制的發光二極體陣列與使得發光均 勻化的光學膜。在另一實施例中，有機發光二極體(organic • light-emitting diode，QLED)陣列、奈米碳管場發射元件 (Carbon NanQtube Field Emission Device，CNT-FED)陣列、 無機電致發光元件（Inorganic Electroluminescent Device， IEL Device)陣列、具有更高之發光效率更高的雷射二極體 (laser diodes，LD)陣列，或上述發光元件陣列的組合可用 以替代平面光源31中的發光二極體陣列。光柵裝置32係 設置於平面光源31和顯示裝置2c之間，用以調整平面光 源31的能量與寫入顯示裝置2c的範圍，其中光栅裝置32 # 係為可程式化控制的液晶光調制器，而在另一實施例中， 可程式化控制的電濕潤光調制器（electrowetting optical modulator)或可程式化的微機電光調制器（MEMS modulator) 亦可用以替代光栅裝置31 ’且光栅裝置32的解析度係大 於平面光源31的解析度’用以補償平面光源31解析度的 不足。在一實施例中，控制裝置13係依據光柵裝置32的 穿透光譜選擇平面光源31的發光波長，用以增加影像對比 度。在另一實施例中’控制裝置13係依據光吸收層25的 吸收光譜選擇平面光源31的發光波長，用以增加平面光源 201102704 -31的使用效率。在另一實施例中，上述平面光源31與光 柵裝置32可由具有高解析度之發光元件陣列取代，上述具 有高解析度的發光元件陣列包括具有高解析度之發光二極 體陣列、有機發光二極體陣列、奈米碳管場發射元件陣列、 無機電致發光元件陣列、雷射發光二極體陣列，或具有高 解析度之上述發光元件的組合。 第3圖更顯示本發明的一種光寫入方法，以及使用光 寫入方法的顯示系統3。光寫入方法包括初始化程序以及 •影像資料寫入程序。首先，控制裝置13會施加第一電場於 顯示裝置2c的兩電極層22和24之間，並利用光寫入裝置 3a之光柵裝置32調控平面光源31的發光，用以初始化顯 示裝置2c的膽固醇液晶層23的光學狀態至亮態。初使化 膽固醇液晶層23可以藉由使用第一電場與平面光源31的 發光之其中一者個別地完成，舉例而言，當第一電場為零 時，顯示裝置2C僅藉由平面光源31的發光而被初始化； 而在另一實施例中，當平面光源31關閉時，顯示裝置2c 泰僅藉由第一電場而被初始化。然後，控制裝置13施加第二 電場於電極層22和24之間，並利用光寫入裝置3a之光柵 裝置32調控平面光源31的發光而將影像資料寫入顯示裝 置2c，其中第一電場大於第二電場。舉例而言，平面光源 31係為可程式化控制的發光二極體陣列與使得發光均勻化 的光學膜。在另一實施例中，有機發光二極體陣列、奈米 碳管場發射元件陣列、無機電致發光元件陣列、具有更高 之發光效率更高的雷射二極體陣列’或上述發光元件陣列 的組合可用以替代平面光源31中的發光二極體陣列。光柵 201102704 裝置32係為可程式化控制之液晶光調制器、可程式化控制 之電濕潤光調制器或可程式化之微機電光調制器。具體而 言，在光寫入過程中，控制裝置13係根據所欲顯示^影像 關閉光柵裝置32的區域Dl、仏和，且控制裝置丨3係 根據所欲顯示之影像開啟其他的區域C|、a和C3，如此一 來’與光栅裝置32 #區域Dl、〇2和〇3相對應的顯示裝置 2c的區域Al、A2和、，會因為區域、、、和、的膽固 醇液晶層23並未受到寫入光線14的照射而呈現亮態所 以可以將入射的環境光34反射，而反射的環境光34，則會 被觀察者察覺而認定顯示裝置2c的區域八1、〜和八3為^ 區^相反地，與光柵裝置32的區域Ci、^和C3相對應二 顯不裝置2c的區域Β丨、I和I，會因為區域Β丨、仏和 的膽固醇液晶層23受到寫人紐14的照射而呈現暗 態，無法將入射的環境光33反射而被觀察者察覺，所以觀 察者認定顯示裝置2C的區域Bl、1和B3為暗區。在另一 實施例中，施加大於第二電場的第三電場於顯示裝置2c的 兩電極層22和24之間，可使未受到光線照射的區域Αι、 八2和A;呈現暗態，而使受到光線照射的區域I、h和& 呈現亮態。其中第三電場小於第—電場。在另—實施例中， 施加略小於第二電場的第四電場於顯示裝置及的兩電極 層22和24之間，可使未受到光線照射的區域A〗、A〗和 As呈現亮態，而使受到光線照射的區域&、^和^呈現 較暗態為亮的灰階態。在另一實施例中，施加略大於第三 電場的第五電場於顯示裝置2c的兩電極層22和24之間， 可使未受到光線照射的區域Al、、和&呈現較暗態為亮 201102704 • 的灰階態，而使受到光線照射的區域B〗、B2和B3呈現亮 態。其中第五電場小於第一電場。 第4圖顯示根據本發明之適用於顯示系統之光寫入方 法之一實施例。顯示系統包括顯示裝置2C以及光寫入裝置 的平面光源31，其中平面光源31的發光體係為7*5的發 光一極體陣列，並且平面光源31的光前進方向係沿著+z 軸。平面光源31更包括複數發光元件Ln、Ll2、Li3、L14、 La、1^卜丄25..丄75，且個別的發光元件係為可程式化控制 • 的發光二極體、可程式化控制的有機發光二極體、可程式 化控制的奈米碳管場元件、可程式化控制的無機電致發光 疋件或可程式化控制的雷射發光二極體，並依據所欲顯示 之影像分別被導通。光寫入裝置更包括光栅裝置32(第4 圖未顯示），其中光栅裝置32係為可程式化控制的液晶光 調制器、可程式化控制的電濕潤光調制器或可程式化的微 機電光調制器，且光柵裝置32的解析度係大於平面光源 31的解析度，用以補償平面光源31解析度的不足。在本 •發日月之光寫人方法之_實關中，控制裝置13根據所欲顯 不之影像區域的尺寸wxyz，控制平面光源31之相應的光 源掃描發光區域為WXYZ，即，因為在影像尺寸 wxyz 之 外沒有影像要顯示，則控制裝置13控制平面光源31在掃 描區域WXYZ之外的發光元件L"〜L15、L21、L25、L31、 l35、l41、l45、l51、L55、l61、l65 和 l7丨〜l75 關閉，用以 郎省顯示系統的耗電量。 、第4圖及第5圖更顯示根據本發明之適用於顯示系統 光寫方法之另一實施例。在本實施例中，顯示裝置2c 201102704 顯不的影像區域係為wxyz，而影像内容係為p5。控制裝置 m艮據影像内$ρ5,控制平面光源31的發光元導通 第-時期τ丨，且在Τι時期的電壓為v伏特，而在掃瞄區 域WXYZ之内除了發光元件L43的其他發光元件，如 L22〜L24、U2〜L34、L42及L44、乙52〜以及L62〜L64則導通 第二時期τ2’並且在掃描區域WXYZ^外的其他發光元件 則關閉’其中T>T2。在另—實施例中，僅有&導通（第 -時期 ，而 l22〜l24、l『L34、L42 及 、L52〜L54 以及 • L62〜W系被關閉（即T2=0)e藉此將影像内容^寫入顯示 裝置2c ’並增加顯示系統的對比以及節省顯示系統的耗電 量。 第6圖顯示根據本發明之適用於顯示系統之光寫入方 法之另-實施例。第7圖顯示發光元件 $ L54的導通時脈目。在本實施例中，㈣時顯示影像内 容Pi、P3、P5、卜和P9並且影像内容p】、p3、&、匕和& 分別預設被發光元件l32、L34、L43、L52和k照射A、A、 丁5、丁6和Τ7時期以達到預設之灰階值，其中 t3=ht#t5，故控制裝置13分別控制發光元件&、 L34、L43、L52 和 L54 導通 τ8 和 Τ9、Τι〇 和 Τι 1、Τΐ2 和 、 Τμ和L以及丁1(5和b時期，以及關閉除了 L32、LM、L43、 L52和L54之外的其他發光元件，其中Τ122Τ8= 丁14= T16 J. τ13^ τ9= τη= τ15= Τ]7, mχ τ8η-τ9=τ3,τΙ0+τπ=τ4, i2+T13:T5’T14+TI5=T6，TI6+TI7=T7〇 第 8 圖顯示在另一實施 例中，經由影像演算法得到最能降低耗電量的平面光源 的導通時脈圖’即，控制裝置13依據影像内容以不同順序 12 201102704 導通發光元件L32、L34、L43、l54 L5”首先，控制裝置 13分別控制發光元件L32、]^4和同時導通了3、丁4和h 時期，其巾Τ5^Τ3=Τ4,並且控制裝置13控制發光元件L52 和L54關閉；接著，控制裝置13再分別控制發光元件[Μ、 L34和La關閉，並且控制裝置13控制發光元件[η和Ls4 同時導通τ6和τ7時期，其中Τ6=Τ7= Τ3=Τ4，並且在本實施 例中，平面光源31除了發光元件“2、&、“3、h和“ 的其他發光二極體都關閉。 第6圖更顯示根據本發明光寫入方法之初始化程序之 =一實施例。在本實施例中，由於需要顯示暗態的區域比 需要顯示亮態的區域多’控制裝置13首先施加第二電場於 兩電極層22和24之間，並導通平面光源31以將顯示裝置 2c寫成該暗態的灰階值，接著進行前段所述之光寫入方 法。反之，在另一實施例中，若欲顯示的影像内容僅I、 6、Ps、Ρ·7和&為暗態，則因為需要顯示亮態的區域較需 要顯不暗態的區域為多，則控制裝置13施加第一電場於兩 電極層22和24之間，並導通平面光源31以將顯示裝置 2c初始化成亮態的灰階值，接著進行前段所述之光寫入方 夬八中弟電场大於第二電場。藉此根據影像内容來控 制膽固醇液晶層23的初始狀態以及平面光源31的掃描區 域’達到降低耗電量的目的。 雖本發明已以實施例揭露如上，然其並非用以限定 本卷明，任何熟悉此項技藝者，在不脫離本發明之精神和 範圍内’當可做些許更動與潤飾，因此本發明之保護範圍 當視後附之申請專利範圍所界定者為準。 IS] 13 201102704 【圖式簡單說明】 第1圖係為本發明—實施例之顯示系統之示意圖。Ambient incident light 26, and reflecting ambient light 26, is perceived by the observer and identifies areas B1, 2 and & When the cholesteric liquid crystal molecules of the cholesteric liquid crystal layer 23 absorb the energy of the writing light 14 and are in a stable state of a transparent state capable of expressing a dark state, such as the state of the cholesteric liquid crystal molecules of the cholesteric liquid crystal layer 23 of the display device 2b, cholesterol The helical axis of the liquid crystal molecules tends to be parallel to the substrate but distributed in an unequal manner, so that most of the incident ambient light 27 penetrates, and the observer cannot perceive the incident ambient light 27 reflected by the cholesteric liquid crystals of the regions A!, and As. It is assumed that the regions 々 and A3 are dark regions, and the color of the t absorbing layer 25 may be black to absorb the scattered scattered light to display a dark state. Fig. 3 shows a display device 2c and an optical writing device 3a of the display system 3 according to an embodiment of the present invention. The display system 3 includes a display device and a writing device 3a. The display device 2c includes a substrate 21, a two-electrode acoustic 2 cholesteric liquid crystal layer 23, and a light absorbing layer 251. The electrode layers are electrically controlled by the control device 13, wherein the electrode 22 can be a transparent electrode: formed on the substrate 21 . The cholesteric liquid crystal layer 23 is provided between the layers #22 and 24' and has different optical states depending on the energy of the different writing human light 14 and the applied electric field between the electrode layers 201102704 - 22 and 24. The light absorbing layer 25' serves to absorb the energy of the writing light 14 and change the photoelectric state of the cholesterol liquid crystal layer 23. The optical writing device 3a includes a planar light source 31 that uniformly emits light and a grating device 32. The planar light source 31 is used as a light source of the optical writing device 3a to generate the writing light 14 through the grating device 32, and the image data is written into the display device 2c by the writing light 14, wherein the planar light source 31 is programmable. The array of light-emitting diodes is an optical film that homogenizes the light. In another embodiment, an organic light-emitting diode (QLED) array, a Carbon NanQtube Field Emission Device (CNT-FED) array, and an electro-luminescence-free element ( An Inorganic Electroluminescent Device (IEL Device) array, a laser diodes (LD) array having a higher luminous efficiency, or a combination of the above-described light emitting element arrays may be used instead of the light emitting diodes in the planar light source 31 Array. The grating device 32 is disposed between the planar light source 31 and the display device 2c for adjusting the energy of the planar light source 31 and the range of the writing display device 2c, wherein the grating device 32# is a programmable liquid crystal light modulator. In another embodiment, a programmable control electrowetting optical modulator or a programmable MEMS modulator can also be used in place of the grating device 31 'and the grating device 32 The resolution is greater than the resolution of the planar light source 31 to compensate for the lack of resolution of the planar light source 31. In one embodiment, the control device 13 selects the illumination wavelength of the planar light source 31 based on the transmission spectrum of the grating device 32 to increase the image contrast. In another embodiment, the control device 13 selects the light-emitting wavelength of the planar light source 31 in accordance with the absorption spectrum of the light absorbing layer 25 to increase the use efficiency of the planar light source 201102704-31. In another embodiment, the planar light source 31 and the grating device 32 may be replaced by an array of light-emitting elements having high resolution, and the array of high-resolution light-emitting elements includes a high-resolution LED array and an organic light-emitting diode. A polar body array, a carbon nanotube field emission element array, an electroless electroluminescent element array, a laser light emitting diode array, or a combination of the above-described light emitting elements having high resolution. Fig. 3 further shows an optical writing method of the present invention, and a display system 3 using an optical writing method. The optical writing method includes an initialization program and an image data writing program. First, the control device 13 applies a first electric field between the two electrode layers 22 and 24 of the display device 2c, and controls the illumination of the planar light source 31 by the grating device 32 of the optical writing device 3a for initializing the cholesterol of the display device 2c. The optical state of the liquid crystal layer 23 is to a bright state. The initial cholesteric liquid crystal layer 23 can be individually performed by using one of the first electric field and the illumination of the planar light source 31. For example, when the first electric field is zero, the display device 2C is only by the planar light source 31. The light is initialized; and in another embodiment, when the planar light source 31 is turned off, the display device 2c is initialized only by the first electric field. Then, the control device 13 applies a second electric field between the electrode layers 22 and 24, and uses the grating device 32 of the optical writing device 3a to regulate the illumination of the planar light source 31 to write image data to the display device 2c, wherein the first electric field is greater than The second electric field. For example, the planar light source 31 is an array of light-emitting diodes that can be programmed to be controlled and an optical film that homogenizes the light. In another embodiment, the organic light emitting diode array, the carbon nanotube field emission element array, the inorganic electroluminescent element array, the laser diode array having higher luminous efficiency, or the above light emitting element A combination of arrays can be used in place of the array of light emitting diodes in planar light source 31. Gratings 201102704 Device 32 is a programmable liquid crystal light modulator, a programmable control electrowetting light modulator or a programmable microelectromechanical light modulator. Specifically, in the optical writing process, the control device 13 turns off the regions D1 and 仏 of the raster device 32 according to the image to be displayed, and the control device 开启3 turns on other regions C| according to the image to be displayed. , a and C3, such that the regions A1, A2, and of the display device 2c corresponding to the grating devices 32# regions D1, 〇2, and 〇3 may be due to the cholesteric liquid crystal layer 23 of the regions, The ambient light 34 is reflected by the illumination of the writing light 14 so that the incident ambient light 34 can be reflected, and the reflected ambient light 34 is perceived by the observer to determine that the areas 八, 〜, and 八 3 of the display device 2c are ^ Region^ Conversely, corresponding to the regions Ci, ^, and C3 of the grating device 32, the regions Β丨, I, and I of the device 2c are not affected by the region Β丨, 仏, and the cholesteric liquid crystal layer 23 The illumination of 14 is dark, and the incident ambient light 33 cannot be reflected and is perceived by the observer. Therefore, the observer determines that the regions B1, 1 and B3 of the display device 2C are dark regions. In another embodiment, applying a third electric field greater than the second electric field between the two electrode layers 22 and 24 of the display device 2c allows the regions Αι, 八2, and A that are not exposed to light to be present in a dark state. The areas I, h, and & illuminated by the light are rendered in a bright state. Wherein the third electric field is smaller than the first electric field. In another embodiment, a fourth electric field slightly smaller than the second electric field is applied between the display device and the two electrode layers 22 and 24, so that the regions A, A, and As that are not exposed to the light are rendered bright. The regions &, ^ and ^ that are exposed to the light are in a gray state in which the dark state is bright. In another embodiment, a fifth electric field slightly larger than the third electric field is applied between the two electrode layers 22 and 24 of the display device 2c, so that the regions A1, and & Bright 201102704 • The gray state, and the areas B, B2, and B3 illuminated by the light are bright. Wherein the fifth electric field is smaller than the first electric field. Figure 4 shows an embodiment of an optical writing method suitable for use in a display system in accordance with the present invention. The display system includes a display device 2C and a planar light source 31 of the optical writing device, wherein the illumination system of the planar light source 31 is a 7*5 array of light-emitting bodies, and the direction of light travel of the planar light source 31 is along the +z axis. The planar light source 31 further includes a plurality of light-emitting elements Ln, L12, Li3, L14, La, 1^, 丄25..丄75, and the individual light-emitting elements are programmable diodes, programmable control, and programmable control Organic light-emitting diodes, programmable carbon nanotube components, programmable inorganic light-emitting elements or programmable light-emitting diodes, depending on the image to be displayed They are turned on separately. The optical writing device further includes a grating device 32 (not shown in FIG. 4), wherein the grating device 32 is a programmable liquid crystal light modulator, a programmable control electrowetting light modulator or a programmable micro-electromechanical device. The optical modulator, and the resolution of the grating device 32 is greater than the resolution of the planar light source 31 to compensate for the lack of resolution of the planar light source 31. In the actual method of the light of the sun, the control device 13 controls the corresponding light source of the planar light source 31 to scan the light-emitting area to WXYZ according to the size wxyz of the image area to be displayed, that is, because the image is in the image When there is no image other than the size wxyz to be displayed, the control device 13 controls the light-emitting elements L"~L15, L21, L25, L31, L35, l41, l45, l51, L55, l61, l65 of the planar light source 31 outside the scanning area WXYZ. And l7丨~l75 off, used to display the system's power consumption. 4 and 5 further illustrate another embodiment of a method for optical writing of a display system in accordance with the present invention. In this embodiment, the image area displayed by the display device 2c 201102704 is wxyz, and the image content is p5. The control device m controls the light-emitting element of the planar light source 31 to turn on the first period τ 艮 according to the image ρ 5 , and the voltage during the 时期 period is v volts, and the other light-emitting elements other than the light-emitting element L43 within the scanning region WXYZ For example, L22 to L24, U2 to L34, L42 and L44, B52 to L62 and L62 to L64 turn on the second period τ2' and the other light-emitting elements outside the scanning area WXYZ^ turn off 'where T> T2. In another embodiment, only & is turned on (the - period, and l22~l24, l"L34, L42 and L52~L54 and · L62~W are closed (ie T2 = 0) e The image content is written to the display device 2c' and the contrast of the display system is increased and the power consumption of the display system is saved. Figure 6 shows another embodiment of an optical writing method suitable for a display system in accordance with the present invention. The on-time pulse of the light-emitting element $L54 is displayed. In the present embodiment, the video contents Pi, P3, P5, Bu, and P9 are displayed and the video contents p], p3, &, 匕, and & are preset respectively. The light-emitting elements l32, L34, L43, L52 and k illuminate the A, A, D5, D6 and Τ7 periods to reach a preset gray scale value, where t3 = ht #t5, so the control device 13 controls the light-emitting elements & , L34, L43, L52, and L54 turn on τ8 and Τ9, Τι〇 and Τι 1, Τΐ2 and , Τμ and L, and D1 (5 and b periods, and turn off all but L32, LM, L43, L52, and L54 Light-emitting element, where Τ122Τ8=丁14= T16 J. τ13^ τ9= τη= τ15= Τ]7, mχ τ8η-τ9=τ3,τΙ0+τπ=τ4, i2+ T13: T5'T14+TI5=T6, TI6+TI7=T7〇 Figure 8 shows, in another embodiment, the conduction clock map of the planar light source that can most effectively reduce power consumption via image algorithm' The device 13 turns on the light-emitting elements L32, L34, L43, and L54 L5 according to the video content in different order 12 201102704. First, the control device 13 controls the light-emitting elements L32, 4, and 4, respectively, and simultaneously turns on the 3, D, and h periods. Τ5^Τ3=Τ4, and the control device 13 controls the light-emitting elements L52 and L54 to be turned off; then, the control device 13 controls the light-emitting elements [Μ, L34, and La, respectively, and the control device 13 controls the light-emitting elements [η and Ls4 simultaneously turn on τ6] And τ7 period, where Τ6=Τ7=Τ3=Τ4, and in the present embodiment, the planar light source 31 is turned off except for the light-emitting elements "2, &, "3, h, and" other light-emitting diodes. Further, an embodiment of the initialization procedure of the optical writing method according to the present invention is shown. In this embodiment, since the area in which the dark state needs to be displayed is larger than the area in which the bright state needs to be displayed, the control device 13 first applies the second electric field to the two. Between the electrode layers 22 and 24, and Passing the planar light source 31 to write the display device 2c to the grayscale value of the dark state, and then performing the optical writing method described in the previous paragraph. Conversely, in another embodiment, the image content to be displayed is only I, 6, and Ps. , Ρ·7 and & are dark states, because the area where the bright state needs to be displayed is more than the area requiring the dark state, the control device 13 applies the first electric field between the two electrode layers 22 and 24, and is turned on. The planar light source 31 initializes the display device 2c to a grayscale value in a bright state, and then performs the optical writing method described in the preceding paragraph, which is greater than the second electric field. Thereby, the initial state of the cholesteric liquid crystal layer 23 and the scanning area of the planar light source 31 are controlled in accordance with the image content to achieve the purpose of reducing power consumption. The present invention has been disclosed in the above embodiments, but it is not intended to limit the scope of the present invention. Any one skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application attached. IS] 13 201102704 [Simplified description of the drawings] Fig. 1 is a schematic view showing a display system of the present invention.
第2a、2b圖係為本發明一實施例之顯示裝置之示意 系統及使用光寫入 第3圖係為本發明一實施例之顯示 方法的顯示系統之示意圖。 實施例之光寫入方法之示意圖。 實施例之光寫入方法之發光元件2a and 2b are schematic diagrams showing a display system and an optical writing according to an embodiment of the present invention. Fig. 3 is a view showing a display system of a display method according to an embodiment of the present invention. A schematic diagram of an optical writing method of an embodiment. Light-emitting element of the optical writing method of the embodiment
第4圖係為本發明一 第5圖係為本發明一 導通之時脈圖。 f 6圖係為本發明—實施例之光寫人方法之示意圖。 第7圖係為本發明一實施例之光寫入方法之發光元件 導通之時脈圖。 、第8圖係為本發明—實施例之歧入方法之發光元件 導通之時脈圓。 【主要元件符號說明】 I ' 3〜顯示系統； II ' 2a、2b、2c〜顯示裝置； 12、3a〜光寫入裝置； 13〜控制裝置； 14〜寫入光線； % ' 27、33、34〜入射環境光； 26’、34’〜反射環境光； B1'B2、B3、〜亮區； 201102704 A]、A2、A3、D〗、D2、D3〜暗區， 21〜基板； 22、24〜電極； 23〜膽固醇液晶層； 2 5〜光吸收層； 31〜平面光源； 32〜光柵裝置； L65、Fig. 4 is a timing diagram of a fifth embodiment of the present invention. The f 6 diagram is a schematic diagram of the method of the light writer of the present invention. Fig. 7 is a timing chart showing the light-emitting element of the optical writing method according to an embodiment of the present invention. Fig. 8 is a clock circle in which the light-emitting element of the dissimilar method of the present invention is turned on. [Main component symbol description] I ' 3 ~ display system; II ' 2a, 2b, 2c ~ display device; 12, 3a ~ optical writing device; 13 ~ control device; 14 ~ write light; % ' 27, 33, 34~ incident ambient light; 26', 34'~ reflected ambient light; B1'B2, B3, ~ bright area; 201102704 A], A2, A3, D, D2, D3~ dark area, 21~ substrate; 24~electrode; 23~cholesterol liquid crystal layer; 2 5~ light absorbing layer; 31~planar light source; 32~grating device; L65,
Lll~Li5、L21 〜L25、L31〜L35、L41 〜L45、乙5广L55、L61 Φ L71~L75〜發光元件； wxyz〜影像寫入區域； WXYZ、MNOP〜光源掃描發光區域；Lll~Li5, L21~L25, L31~L35, L41~L45, B5 wide L55, L61 Φ L71~L75~ illuminating element; wxyz~image writing area; WXYZ, MNOP~light source scanning illuminating area;
Pi、P3、P5、P7、P9〜影像内容； Τι、τ2、τ3..·τ17〜時期。Pi, P3, P5, P7, P9 ~ video content; Τι, τ2, τ3..·τ17~ period.
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