M313841 八 新型說明： 【新型所屬之技術領域】 關於一種顯示聚置之可調 本案是關於一種顯示裝置，特別是 式自動亮度調整裝置，其可利用外二二 、 得光感應電舰搭配不同触的%來控制紐應電流，使 電及提高使用顯示器之去調整其輸出反應，以達到省 【先前技術】 隨著科技的進步，如行動電話、筆記型 發展突飛猛進，尤其是近幾年發展出:置在電 的顯示裝置，不斷地要求顯示的晝質要清晰，就連 用機動性也逐漸受到重視。 ,、、/、衣置勺使 性提高，首當其衝的就是要改善 現i f Γ 示装置與環境光線之間光源反差的 成因為’料境祕太亮時，顯轉置所呈現的晝面其對比 足，使得士使用者在觀看顯示裝置時眼部較為吃力，、然而 線太暗時，顯示裝置所呈現的晝面相對環境光線而言較 儿，如此強烈的光線將造成使用者眼部的不，適。 基於上述缺失，一種具有赛廑調聲奘罢 、味, 徑”,儿度今正衣置之顯示裝置因應而 、芝，其中凴度調整裝置所採用的技術如第—圖所示， 与知技術之亮度調整裝置之方塊示意圖。亮度調整裝置綱包含 :光源感測單元1及-外接於光源感測單元i的電阻R1 ==元！内包含-光二極體D1及—增幅電路1G。增幅電路 ◦將光二極體D1所偵測到的顯示裝置外部的環境光放大，產生 、光源訊號’即光感應電流，如第二_示，其係為習知技術之 5 M313841 '環境光照度對應光感應電流之特性曲線圖。而此 一 阻R1的轉換而產生輸出電壓vQUt。 唬經由電 在第二圖中，由於亮度調整裝置的整體電路對於产产刀 的反應有-定的極限，亦即當環境光照度大到一定的$ =度 感應電流不會再繼續攀升，而呈現飽和的狀態 光 凡1所輸出的光感應電流具有一轉折點c卜而光二測早 ，環境光照度，可區分為三個區塊，一為弱光模=應 ，式Π ’另-則為強光模式m。弱光模幻表示顯示裝置 报微弱的地方。正常模式n表示顯示裝置處於環ς光日: t中的地方。強光模式絲示顯示裝置處於環境光照度很強的 然而’㈣制者係在環境錄強的地枝⑽ ;顯不1置所呈現的晝面其對比度較為不，^ ;示㈣眼部較為吃力，而且顯示裝置仍持/3= 此壯如何在環境先強或弱的情況下，透過亮度調盤裝置來 置，以及如何改盖哀;2者依售此舒適地硯看顯示裴 如m 度I在調整顯示裝置的顯示亮产時辦 植的力率，將成為顯稀置技術突麵重要課題。4日请 【新型内容】 «本Ϊ:一顯示裝置之可調式自動亮度調整，置，#以L 成!早兀結合一調變電路 I衣置係以〜光源感 置外部之環境光，並根據所_=料置可以自__貝示裝 之背光電流，使使用者可以清晰 μ光照度來罐_示裝置 的顯示裝置上的影像畫面，以及1 地觀看經調整背光亮度後 亮度調整裝置包含光源感^ &電源消耗的問題。 凡及調變電路。光源感測單元 6 M313841 在受到顯不裝置外部之環境光照射後，會產生杨訊號。接著， 调贫私路會根據光源感測單元所輸出的光源訊號，來控制亮度調 -整I置所輸出的光感應電流的大小，且此光感應電流具有一轉折 點。當光感應電流變大時，則顯示裝置顯示的亮度會跟著變大， 當光=應電流變小時，則顯示裝置顯示的亮朗會跟著變小。 當顯不裝置外部的環境光越弱時，亮度調整裝置所提供之光 感應電流就越小；當顯示裝置外部的環境光越強且尚未到達轉折 點時’売度調整裝置所提供之光感應電流就越大；當顯示裝置外 鲁部的％境光越強且超越轉折點時，亮度調整裝置所提供之光感應 電流會逐漸降低至零。由於亮度調整裝置所提供之光感應電流係 呈線性下降或上升，因此，當顯示裝置外部的環境光變更幅度大 時’使用者仍可清晰且舒適地觀賞，經過調整背光亮度後的顯示 裝置上之影像晝面。 【實施方式】 請參考第三圖所示，其係為本案之亮度調整裝置之方塊示意 馨圖。壳度调整裝置（brightness adjustable apparatus) 200 包含一 光源感測單元（light detection unit) 2、一調變電路（modulation circuit) 30 〇 . 光源感測單元2包令—光二極體（photo diode) D2及一增 -幅電路（amplification circuit) 20。光源感測單元2係利用光二 極體D2來感應顯示裝置（未繪示）所在之處的外部的環境光 (variable ambient light)的強度，光二極體D2會根據其本身之 物理特性，在受到光照後，會產生一小光電流（photo current)， 即光源訊號（light source signal)。然而，僅利用此小光電流來作 為調整顯示裝置顯示亮度的控制依據，容易有誤差，因此，光源 7 M313841 感測單元2進一步地利用增幅電路2〇來將此光源訊號放大，使 得顯示裝置得以利用此放大後之光源訊號來作後段控制的動作。 雖然，在本案中係以光二極體D2及增幅電路20來達成感 應顯示器所在之處的環境光的強度之目的，但本案並不受限於 此’凡可偵測光源後並放大之手段皆係本案之範圍。因此，光源 感測單元2亦可以係一光電晶體（ph〇t〇 transistor)或一影像晶 片（photo 1C )等。 抑一調變電路30係連結於光源感測單元2，用以根據光源感測 單兀2所偵測到的外部環境光的強度，即光源訊號，並搭配一外 ，的外σ卩控制單元（external c〇n加1肋幻ec，來控制亮度調整 二置所輸出的輸出電流1〇的大小，而此輸出電流1〇係為光 忍應电流，用以驅動顯示裝置來提供背光電流（以汰吆价 、、六 ^以進一步驅動背光光源（backlight source )。當輸出電 Γ •文大日守，則月光電流會隨著變大，使得背光光源的強度 會也會跟著變大，當輸出電流lQ變小時，則背光電流 曰 文小，使得背光光源的亮度則會跟著變小。M313841 Eight new descriptions: [New technical field] The adjustable case of a display is related to a display device, especially an automatic brightness adjusting device, which can utilize external two-two, light-sensing electric ships with different touches % to control the current, to make electricity and improve the use of the display to adjust its output response, in order to save the province [prior technology] With the advancement of technology, such as mobile phones, notebook development, rapid development, especially in recent years : The display device placed on the electric power constantly requires the display of the enamel to be clear, and the maneuverability is gradually taken seriously. , , , /, clothing spoon to improve the performance, the first thing to do is to improve the contrast between the current display device and the ambient light source because the material is too bright, the display of the face is the contrast The eye user is more strenuous when viewing the display device. However, when the line is too dark, the face of the display device is relatively light compared to the ambient light. Such strong light will cause the user's eye to not. suitable. Based on the above-mentioned shortcomings, a display device with a celluloid tone, a taste, a diameter, and a child’s clothing is provided, and the technique used by the twist adjustment device is as shown in the first figure. The block diagram of the brightness adjusting device of the technology includes: the light source sensing unit 1 and the resistor R1 == element externally connected to the light source sensing unit i. The optical diode D1 and the amplification circuit 1G are included. The circuit 放大 amplifies the ambient light outside the display device detected by the photodiode D1, and generates a light source signal, that is, a light-induced current, as shown in the second figure, which is a conventional technology of 5 M313841 'environmental illuminance corresponding to light The characteristic curve of the induced current, and the conversion of the resistor R1 produces the output voltage vQUt. 唬 Via the second diagram, since the overall circuit of the brightness adjusting device has a certain limit on the response of the production knife, that is, When the ambient illuminance is large enough, the induced current will not continue to climb, but the saturated state of light will be one. Divided into three blocks, one is weak light mode = should, the formula Π 'the other - is the strong light mode m. The low light mode phantom indicates that the display device reports weak places. The normal mode n indicates that the display device is in the ring light day : The place in t. The glare mode shows that the display device is in a strong ambient light. However, the (4) system is in the environment of strong ground (10); the contrast of the surface of the display is not good, ^; Show (4) the eye is more difficult, and the display device still holds /3 = how strong in the environment first strong or weak, through the brightness adjustment device to set, and how to change the cover; 2 according to the sale of this comfortable place If you look at the display, such as the m-degree I, when you adjust the display device's display, the force rate will become an important topic for the display technology. On the 4th, please [new content] «This book: Adjustable display device Automatic brightness adjustment, set, #为L成! Early 兀 combined with a modulation circuit I clothes set to ~ light source to sense the external ambient light, and according to the _ = material can be installed from the __ 贝 shown the backlight current , so that the user can clear the μ illuminance to the image display on the display device of the device. And after viewing the adjusted backlight brightness, the brightness adjusting device includes the problem of the light source sensing and the power consumption. Where and the modulation circuit, the light source sensing unit 6 M313841 is generated after being exposed to the ambient light outside the display device. Yang Xun. Next, the poverty-reducing private road will control the magnitude of the light-induced current output by the brightness-modulation unit according to the light source signal output by the light source sensing unit, and the light-induced current has a turning point. When the current becomes larger, the brightness of the display device will increase. When the light = current decreases, the brightness of the display device will decrease. When the ambient light outside the device is weak, the brightness is adjusted. The light-induced current provided by the device is smaller; when the ambient light outside the display device is stronger and has not reached the turning point, the light-induced current provided by the temperature-adjusting device is larger; when the display device is outside the Lu The stronger and beyond the turning point, the light-induced current provided by the brightness adjustment device will gradually decrease to zero. Since the light-induced current provided by the brightness adjusting device linearly decreases or rises, when the ambient light outside the display device changes greatly, the user can still clearly and comfortably view the display device after adjusting the brightness of the backlight. The image is inside. [Embodiment] Please refer to the third figure, which is a block diagram of the brightness adjustment device of this case. The brightness adjustable apparatus 200 includes a light detection unit 2, a modulation circuit 30 〇. The light source sensing unit 2 package photo-diode (photo diode) D2 and an amplification circuit 20. The light source sensing unit 2 uses the photodiode D2 to sense the intensity of the external ambient light where the display device (not shown) is located, and the photodiode D2 is subjected to the physical characteristics of the photodiode D2. After illumination, a small photo current, the light source signal, is generated. However, using only the small photocurrent as a control basis for adjusting the display brightness of the display device is easy to have an error. Therefore, the light source 7 M313841 sensing unit 2 further utilizes the amplification circuit 2 to amplify the light source signal, so that the display device can be The amplified light source signal is used for the back-end control action. Although in this case, the optical diode D2 and the amplification circuit 20 are used to achieve the intensity of the ambient light where the display is located, the case is not limited to the fact that all the means for detecting the light source and amplifying the light are The scope of this case. Therefore, the light source sensing unit 2 can also be a ph〇t〇 transistor or a photo chip (photo 1C). The modulating circuit 30 is coupled to the light source sensing unit 2 for sensing the intensity of the external ambient light detected by the light source 2, that is, the light source signal, and the external σ卩 control The unit (external c〇n plus 1 rib magic ec, to control the brightness of the output of the two sets of output current 1 〇, and the output current 1 〇 is the light tolerant current, used to drive the display device to provide backlight current (To reduce the backlight source, and to further drive the backlight source. When the output is Γ 文 文 文 , , 则 , , , , , , , 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月 月When the output current lQ becomes small, the backlight current is small, so that the brightness of the backlight source is reduced.
藉由二::;單控制背光光源所發出的亮度，M 能符合人眼的來控制輸出▲電流10的大小，使得背光光源 在，當使用者在1 見而且’免度調整裳置亦必須設置 到的位置置上之影像晝面時環境光源亦能光照 螢幕：鍵盤附近的位置、行動電話之 元之電路:::圖:二::為:f之調變電路結合外部控制單 所組成，其中包含四組電流鏡（罐⑽mi_) Q及Q3、、且成弟-電流鏡，且輸出電流 8 M313841 為11。電晶體Φ、Q2、Q5組成第二電流鏡，且輪出電流為12。 '電晶體Q4、Q6組成第三電流鏡，且輪出電流為13，由於輸出電 -=二亦係第三電流鏡之輸入電流’因此輸出電流13亦等於輸出 电* 11。而電晶體Q7、Q8組成第四電流鏡，其中電晶體Q7之 汲極端的電流為14，且][4係為輸出電流13 (11)及12的差值， 因此第四電流鏡的輸出電流1 〇的值，即為電晶體Q 7的汲極端電 流14，亦即輸出電流n及12的差值。此外，輸出電流n、i2分 別具有一轉折點（switch p〇im) C21、C22。最後，第四電流鏡 籲所輸出的輸出電流1〇經過電阻幻轉換成輸出電壓v_，以供應 -至後段裝置。 恭，光源訊號輪入至調變電路3〇時，分別透過第一電流鏡内 之電晶體Φ及第二電流鏡内之電晶體Q5，產生輸出電流n及 12二由^電晶體q3與Q5之電晶體佈局不同，因此第一電流鏡 與第二電流鏡之電流比例設計也不同，使得輸出電流η及12之 大^亦不相同’且成一定的比例，也就是說’電晶體Q3與Q5 之特性曲線不同’使得輸出電流II與12在紐曲線上的斜率不 同。 六圖為地闡述本案内容，本案進一步地提供第五圖及第 ，、回 ϋ月上述調變電路30在控制輸出電壓v的叙 t 中第五圖係為本案之产斤土_的動作，其 >罔传A太安、衣兄先'、?、度對應月光包，瓜之特性曲線圖，第 八圖係為本木之壤境光照度對應光感流之 鲶屮雷0 Ti t 1土阳線圖。 11與12之大小係與顯示裝置外部之 (mumin，，正比，然而，亮度調整裝置的整體==度 因此’當頒不器外部之環境光照度分別大於電 『:1 C21 1，!^, Q5 C22 , f 已無法再繼續向上攀升，而呈現飽和狀態。^ 11與12 9 M313841 當輸出電流12小於輪屮兩、、六τι 、 T1 ^ 出甩/爪11 (輸出電流13 )，且輸出電 >”L I 1亦尚未達到飽和（尚夫亲 07沾π把山不— 内禾達到轉折點Ch)時，表示電晶體 Q7的〉及極令而電流14不為零，囡卜 而r^人士 · v 因此，第四電流鏡内之電晶體Q7 與Q8會處於導通的狀態中，佶租北 汁 γι t 吏传月光電流的大小寺於輸出電流 II減去輸出電流12，且呈線忡卜乳 t ^ , τ ^ ^ P9 . 令 深性上升。此時，背光電流經過電阻 R2的轉換，產生輸出電壓v 5 e ^ ^ r- l μ^ΛΑϋϊ At out且輪出電壓V0Llt的大小呈線性 上升的狀態。By two::; single control of the brightness of the backlight source, M can meet the human eye to control the output ▲ current 10, so that the backlight source is, when the user sees and the 'free adjustment of the skirt must also When the image is set to the position, the ambient light source can also illuminate the screen: the position near the keyboard, the circuit of the mobile phone::: Picture: 2:: is: the modulation circuit of f combined with the external control list The composition consists of four sets of current mirrors (tank (10) mi_) Q and Q3, and a dipole-current mirror with an output current of 8 M313841 of 11. The transistors Φ, Q2, and Q5 form a second current mirror, and the current is 12. 'Transistors Q4, Q6 form the third current mirror, and the current is 13, since the output power -= 2 is also the input current of the third current mirror', so the output current 13 is also equal to the output power *11. The transistors Q7 and Q8 form a fourth current mirror, wherein the current of the terminal Q4 of the transistor Q7 is 14, and [4 is the difference between the output currents 13 (11) and 12, so the output current of the fourth current mirror The value of 1 〇 is the 汲 extreme current 14 of the transistor Q 7 , that is, the difference between the output currents n and 12. In addition, the output currents n, i2 have a turning point (switch p〇im) C21, C22, respectively. Finally, the fourth current mirror calls the output current 1〇 through the resistor to the output voltage v_ to supply - to the rear device. Christine, when the light source signal is turned into the modulation circuit 3〇, the output current n and 12 are generated by the transistor Φ in the first current mirror and the transistor Q5 in the second current mirror respectively. The layout of the transistor of Q5 is different, so the current ratio design of the first current mirror and the second current mirror are also different, so that the output currents η and 12 are not the same 'and are in a certain ratio, that is, 'transistor Q3 Different from the characteristic curve of Q5, the output currents II and 12 have different slopes on the curve. The six figures illustrate the content of the case. The case further provides the fifth picture and the first, and the fifth circuit of the above-mentioned modulation circuit 30 in controlling the output voltage v is the action of the production of the case. , its > rumor A Taian, Yixiong first ', ?, degree corresponds to the moonlight package, the characteristic curve of the melon, the eighth picture is the illuminance of the soil of the wood corresponds to the light sensation of the flow of mine 0 Ti t 1 Tuyang line map. The size of 11 and 12 is external to the display device (mumin, proportional, however, the overall brightness of the brightness adjustment device == degrees therefore 'when the ambient light outside the device is greater than the electricity 『:1 C21 1,!^, Q5 C22, f can no longer continue to climb up and appear saturated. ^ 11 and 12 9 M313841 When the output current 12 is smaller than the rim two, six τι, T1 ^ 甩 / claw 11 (output current 13), and the output is >"LI 1 has not yet reached saturation (Changfu pro- -07 π 把 山 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 内 电 电 电 电 电 电 电 电 电 电 电 电 电 电 电 电 电 电 电v Therefore, the transistors Q7 and Q8 in the fourth current mirror will be in the on state, and the size of the moonlight current will be subtracted from the output current II, and the output current is 12, and the line is drawn. t ^ , τ ^ ^ P9 . Let the deep rise. At this time, the backlight current is converted by the resistor R2, and the output voltage v 5 e ^ ^ r- l μ ^ ΛΑϋϊ At out and the rounding voltage V0Llt rises linearly. status.
當查輪：電流12小於輸出電流n(輪出電流13)，且輸出電流 山=達到飽和（已達到轉折點C21)日夺，表示電晶體Q7之沒極 =流14仍不為零，因此第四電流鏡内之電晶體的與⑽ 狀態中，但使得背光電流的大小等於輸出電流n減去輸 12，且呈現線性下降的狀態。此時，經過電阻R2轉換的 輸出電壓vout的大小亦會由轉折點C2開始呈現線性下降的狀 態。當輸出電流Π等於輸出電流n (輸出電流13)，且輸出電产 II仍處於飽和狀態時，第四電流鏡内之電晶體Φ與Q8會處於 關閉狀態中，使得背光電流的大小會等於零，且經過電阻R2轉 換的輪出電壓vout的大小亦會等於零。 ^ §輸出電流12大於輸出電流II (輸出電流13)，且輸出電流 12也已到達飽和狀態時，第四電流鏡内之電晶體q7與。^仍^ 處於關閉狀態中，使得背光電流的大小會等於零，且經過電二 R2轉換的輸出電壓的大小亦會等於零。 因此由上述可知，當顯示裝置外部的環境光越弱時，亮度調 整裴置200所產生之光感應電流就越小；當顯示裝置外部的竟 光越強且尚未到達轉折點C2時，亮度調整裝置2〇〇所產生之^ 感應電流就越大；當顯示裝置外部的環境光越強且超越轉折點 C2時，亮度調整裝置200所產生之光感應電流會逐漸降低至零\ 10 M313841 :於冗度U 2GG所產生之光感應電流 升，因此，當顯雜置外部的環境光變更幅 雜下〜或上 清晰，適Ϊ透過已調整背光亮度的顯轉置來可 值付注意的是’上述之光感應電流對應於貝:外： 境光照度，主要可區分為三個區塊，—為弱光^衣置外拍壞 Ϊ，-為正常模式（_al _de) n，另1為^ =) mode)瓜:弱錢式！表示使用者係在環境光照 方使用上述之頻不裝置，例如無燈光照明的室内或^ ”主〆 模式ϋ表示使用者係在環境光照度適中的 十之㊉ 裝置，例如燈光充足的室内等。強光模式 == 光照度很強的地方制上叙顯示裝置，如烈日下的ttv 『然⑽專折點C21、C22的位置係可由外部控 制早凡EC來控制，且轉折點C2的位置亦係 :)二，可=部峨 由上述可知，圖四中之電阻们即為外部控制單元此。 # 綠卜在本案中係Μ電阻R3來達成控制轉折點C2在曲 紅的位置之目但本錢不受限於此，凡可作為電路負載之 手段皆係本案之範g。因此，外部控制單元此亦可以係二可變 電阻（醫iableresist蠢）或其他類型之阻抗（_edance)等。 在本案最佳應用實施例中，係將此亮度調整裝置·應用於 半反射半穿透型（transflectivetype)的顯示裝置上。半反射半穿 透型顯示裝置彻其本身之特性，當顯示裝置在外部的環境光較 弱時，顯示裝置將進入穿透模式（transmissi〇n獅如），使得顯示 裝置内之背光模組（baeklightmGdule)可以利用光源感測單元2 =調整的光感應電流來驅動顯示裝置，使顯示裝置提供相對應的 背光電流來背光模組，使背光模组能根據錢應電流來控制 M313841 亮度，以顯示出合適的亮度，達到使用者可以舒適地觀看顯示狀 置的目的；另外一方面，當顯示裝置在外部的環境光較強時y，N ^ 示裝置將進入反射模式（reflection mode)，使得顯示裝置之面板 可以根據外部的環境光的反射，以及顯示裝置之背光模組可以祀 據光源感測單元2所調整的光感應電流，使顯示裝置能根據光感 應電流提供相對應的背光電流來驅動背光模組，以顯示出=適^ 亮度，以達到使用者可以舒適且清楚地觀看顯示裝置以及 目的。 包、 雖然，在本案巾細半反射半穿透式顯示裝置作為最佳應用 實施例，但本案並不受限於此，凡可利用光感應電流，產生:對 應的背光電流來驅動背光模組之顯示裝置皆係本案之範圍。因 此，顯示裝置亦可以係-全穿透式顯示裝置、—全反射式顯 置或其他類型之顯示裝置等。 、 本案所提供之優點在於，新增—輕電路來調整光源感 兀所輸出之光源訊號，以產生合適的光感應電流，使顯示裝置可 根據此光感應電流產生相對應的背光€流來賴背光模組，以顯 不出合適的亮度，來達到使用上的高舒適度。 π本案所提供之另-優點在於，新增一調變電路及一外部控制 :元’來根據❹㈣需求輕光源感測單元所輸出的光源訊 ^ ’以產生合適的光感應電流，使顯示裝置可根據此光感應電流 生相對應的背光電流來驅動f光模組，以顯示出合適的亮度， 來達到使用上的高舒適度。 ，案所提供之再-優點在於，t顯示裝置外㈣環境光越弱 :二t周正衣置所產生之光感應電流就越小；當顯示裝置外部 勺=光越強且尚未到達轉折點時，亮度調聽置所提供之光感 〜級就越大；當顯示裝置外部的m境光越強且超越轉折點時， 12 M313841 亮度調整裝置所提供之光感應電流會逐漸降低至零。 ' 本案所提供之再一優點在於，調變電路係由複數個電流鏡所 '組成，其中利用不同電流比例之電流鏡來產生兩個斜率不同:輸 出電流，、此調變電路進一步將兩個斜率不同的輸出電流相減後二 產生光感應電流以驅動顯示裝置產生相對應的背光電流，以 背光模組。 本案所提供之再-優點在於，亮度調整裝置所提供之光感應 以l係呈線性下降或上升，因此，當顯示裝置外部的環境光變更 者畫仍:清晰且舒適地透過已調整背光亮度的顯示 示裝優點在於’此亮度調整裝置係自動偵測顯 【圖式簡單說明】 為習知技術之亮度調整裝置之方塊示意圖； 两線圖為習知技術之環境光照度對應光感應電流之特性 ^三圖係為本案之亮度調整裝置之方塊示意圖； =四圖係為本案之調變電路之電路示意圖； 圖；=圖係為本案之環境光照度對應背光電流之特性曲線 圖。第六圖係為本案之環境細度對應光感應電流之特性曲線 【主要元件符號說明】 13 M313841 亮度調整裝置 100,200 ： 光源感測單元 1，2 . 增幅電路 10,20 調變電路 30 外部控制單元 EC 光二極體 D1，D2 電阻 R1，R2，R3 電晶體 Ql、Q2、Q3、Q4、Q5、Q6、Q7、Q8 輸出電流 11，12,13，1〇 藝汲極端電流14When checking the wheel: the current 12 is smaller than the output current n (round current 13), and the output current mountain = reaches saturation (has reached the turning point C21), indicating that the transistor Q7 has no pole = the stream 14 is still not zero, so the first In the (10) state of the transistor in the four current mirror, but the magnitude of the backlight current is equal to the output current n minus the input 12, and exhibits a linearly falling state. At this time, the magnitude of the output voltage vout converted by the resistor R2 also appears to be linearly decreased from the turning point C2. When the output current Π is equal to the output current n (output current 13), and the output current II is still saturated, the transistors Φ and Q8 in the fourth current mirror are in a closed state, so that the magnitude of the backlight current is equal to zero. And the magnitude of the turn-off voltage vout converted by the resistor R2 is also equal to zero. ^ § Output current 12 is greater than output current II (output current 13), and when output current 12 has also reached saturation, transistor q7 in the fourth current mirror. ^ Still ^ is in the off state, so that the magnitude of the backlight current will be equal to zero, and the output voltage through the electric two R2 conversion will also be equal to zero. Therefore, as can be seen from the above, when the ambient light outside the display device is weaker, the light-induced current generated by the brightness adjusting device 200 is smaller; when the light outside the display device is stronger and has not reached the turning point C2, the brightness adjusting device The induced current of 2〇〇 is greater; when the ambient light outside the display device is stronger and exceeds the turning point C2, the light-induced current generated by the brightness adjusting device 200 is gradually reduced to zero. 10 M313841: The light induced current generated by U 2GG rises. Therefore, when the ambient light of the display is changed to the outside, or the upper part is clear, it is worthwhile to pay attention to the brightness of the adjusted backlight. The light-induced current corresponds to the shell: external: ambient illuminance, which can be divided into three blocks, - for the weak light ^ clothing to shoot the gangrene, - for the normal mode (_al _de) n, the other is ^ =) mode ) Melon: weak money! Indicates that the user uses the above-mentioned frequency device in the ambient lighting, such as indoors without lighting or “main mode”, indicating that the user is in the tenth place with moderate ambient light, such as a well-lit room. Light mode == Where the illuminance is very strong, the display device, such as the ttv under the scorching sun, the position of the C11 and C22 can be controlled by the external control, and the position of the turning point C2 is also :) Second, can be said that the above, we can see that the resistors in Figure 4 are the external control unit. #绿卜 In this case, the resistor R3 is used to achieve the control of the turning point C2 in the position of the song red but the cost is not limited Here, any means that can be used as a circuit load is the standard of this case. Therefore, the external control unit can also be a two-variable resistor (medical iableresist stupid) or other types of impedance (_edance), etc. The best application in this case In an embodiment, the brightness adjusting device is applied to a transflective type display device. The semi-reflective semi-transmissive display device has its own characteristics when the display device When the external ambient light is weak, the display device will enter the penetration mode (transmissim lion), so that the backlight module (baeklightmGdule) in the display device can use the light sensing unit 2 = adjusted light-induced current to drive the display. The device enables the display device to provide a corresponding backlight current to the backlight module, so that the backlight module can control the brightness of the M313841 according to the current of the money to display the appropriate brightness, so that the user can comfortably view the display position; On the other hand, when the external light of the display device is strong, the device will enter a reflection mode, so that the panel of the display device can reflect the external ambient light and the backlight of the display device. The group can according to the light-induced current adjusted by the light source sensing unit 2, so that the display device can provide a corresponding backlight current according to the light-induced current to drive the backlight module to display the brightness of the user to be comfortable. And clearly see the display device and the purpose. Package, though, in the case of a thin semi-reflective semi-transmissive display device As a preferred application embodiment, the present invention is not limited thereto. Any display device that can use the light-induced current to generate a corresponding backlight current to drive the backlight module is within the scope of the present invention. Therefore, the display device can also be used. - Full-transmission display device, - Total reflection display or other types of display devices, etc. The advantage provided by this case is that a new-light circuit is added to adjust the light source signal output by the light source to produce a suitable The light-sensing current enables the display device to generate a corresponding backlight according to the light-induced current to the backlight module, so as to show the appropriate brightness to achieve high comfort in use. π This case provides another- The utility model has the advantages that a modulation circuit and an external control are added: the element is configured to generate a suitable light-sensing current according to the light source signal output by the light source sensing unit according to the fourth (four), so that the display device can induce the current according to the light. The corresponding backlight current is generated to drive the f-light module to display the appropriate brightness to achieve high comfort in use. The advantage provided by the case is that the t-display device is outside (4) the weaker the ambient light is: the smaller the light-induced current generated by the two-week positive clothing setting; the stronger the external scooping light of the display device = the light has not yet reached the turning point, The brightness sense level provided by the brightness adjustment device is larger; when the external light of the display device is stronger and beyond the turning point, the photo-induced current provided by the 12 M313841 brightness adjustment device is gradually reduced to zero. Another advantage provided by the present invention is that the modulation circuit is composed of a plurality of current mirrors, wherein current mirrors with different current ratios are used to generate two different slopes: output current, and the modulation circuit will further The two output currents with different slopes are subtracted to generate a photo-induced current to drive the display device to generate a corresponding backlight current to the backlight module. The re-advantage provided by the present invention is that the light sensing provided by the brightness adjusting device linearly drops or rises in a series, so that when the ambient light changer outside the display device draws: the brightness of the adjusted backlight is clearly and comfortably transmitted. The advantage of display display is that 'this brightness adjustment device is automatically detected. [Simple description of the figure] is a block diagram of the brightness adjustment device of the prior art; the two-line diagram is the characteristic of the ambient light of the conventional technology corresponding to the light-induced current ^ The three diagrams are block diagrams of the brightness adjustment device of the present invention; = four diagrams are schematic diagrams of the circuit of the modulation circuit of the present invention; Fig.; = diagram is the characteristic curve of the ambient light illuminance corresponding to the backlight current. The sixth figure is the characteristic curve of the environmental fineness corresponding to the light induced current in this case. [Main component symbol description] 13 M313841 Brightness adjusting device 100, 200 : Light source sensing unit 1, 2 . Amplifying circuit 10, 20 Modulation circuit 30 External control Unit EC photodiode D1, D2 Resistor R1, R2, R3 Transistor Ql, Q2, Q3, Q4, Q5, Q6, Q7, Q8 Output current 11, 12, 13, 1 〇 汲 汲 extreme current 14
1414