201033996 六、發明說明： 【發明所屬之技術領域】 示器的控制方法，尤其是控制 本發明係有關於一種顯 顯示态壳度均一 *j·生的方法。 【先前技術】201033996 VI. Description of the invention: [Technical field to which the invention pertains] Control method of the present invention, particularly control The present invention relates to a method for uniformly displaying the shell degree of the display state. [Prior Art]
Φ 般的LCD顯不器具有可以自行調整螢幕亮度的功 能，使用者可根據自⑽喜好及習慣，調整適的亮度，雖 然個人習慣的亮度不同’但大都介於-定的範圍内，因此 一般的LCD顯示器並不具有調整到全亮及全暗的功能，而 是介於中_某-顧。然而，在某些特殊使用環境，比 如航海電腦’常常她暗的環境下㈣，此時若仍使用平 吊的冗度’使用者會感到相當刺目艮，因此需要把亮度調到 很低的水準。 洞光(Dimming)就是針對這樣環境下的技術，好的調 光没计甚至可以讓顯示器的亮度調整範圍從100%〜〇% ’以 符合各種不同的使用需求。參閱第一圖，，為習知技術之 顯示器亮度控制的示意圖。如第一圖所示，燈管發光亮度 比相對於外部輸入的調光設定信號為線性變化，其中調光 設定信號可為複數個位元信號，或具特定信號強度的類比 信號’燈管發光亮度比依據全域設定範圍而由1〇〇%至⑽ 逐漸線性變化。 然而，當燈管亮度調整到接近〇%的時候，由於此時的 201033996 驅動電流非微弱，常常造成顯示器發生亮度不平均的色 偏現象，影響整體晝面的晝質。 因此，需要一種顯示器亮度均一性控制方法，利用不 同調光速度’針對不同亮度區段進行最佳化的亮度調整， 提高顯示器在高亮度與中亮度的調光效果，同時在過低亮 度時保持亮度的均—性，藉以解決上述習知技術的缺點。 【發明内容】 ❹ 本發明的主要目的係提供一種顯示器亮度均一性控 制方法，係依據外部調光設定信號，調整燈管的最佳發光 冗度，其中在所需燈管亮度低於某一亮度下限值時，直接 關閉燈官而跳到全暗的亮度，以避免燈管亮度過低時發生 亮度不均勻而影響整體影像品質的現象。 本發明的另一目的係提供一種顯示器亮度均一性控 ❹ 制方法’針對人眼在高亮度時對亮度的變化較不敏銳而在 低冗度時對焭度的變化較為敏銳，進而在較高亮度區段， 對顯示器的燈管進行較快的亮度調整，錢在較低亮度區 段進行較慢的亮度調整。 【實施方式】 〆以下配合圖式及元件符號對本發明之實施方式做更 詳細的說明，俾使熟習該項技藝者在研讀本說明書後能 據以實施。 4 201033996 參閱第二圖，本發明顯示器亮度均一性控制方法的調 光系統之示意圖。如第二圖所示，該調光系統包括一調光 控制器10、一燈管驅動器20以及至少一燈管3〇，其中調 光控制器10接收外部輸入的調光設定信號DS，比如一般 顯不吊用的營幕視控糸統(〇n-Screen Display，OSD) 技術，藉由螢幕的按鍵以設定所需的顯示器亮度，亦即控 制燈管亮度。調光控制器10產生燈管控制信號LC，燈管 ❹ 驅動器20接收燈管控制信號LC，並產生調光驅動信號 DD ’用以點亮燈管30並控制燈管3〇的亮度》 通常，調光設定信號DS係數位信號，亦即具高位準 或低位準，燈管控制信號LC可為類比信號或數位信號。 以發光二極體（Light Emitting Diode，LED)燈管為例， LED燈管屬於電流驅動，因此需要定電流驅動，電流愈大 則燈管愈壳，所以視燈管驅動器2〇的調光驅動信號如為 φ 類比的定電流驅動信號，而且燈管驅動器20具有反饋機 制以維持穩定的電流輸出，反饋機制為習知技術，在此不 再贅述。 參閱第二圖，本發明第一實施例之顯示器亮度均一性 控制方法的示意圖。如第三圖所示，本發明的第一實施例 具有第一調光特性曲線L1與第二調光特性曲線L2，係由 第二圖的调光控制器1〇、燈管驅動器2〇以及燈管3〇所產 生，其中第5周光特性曲線L1為斜線，而第二調光特性 201033996 曲線L2為垂直線。圖中的燈管發光亮度比係燈管的燈管 發光亮度與全亮的燈管發光亮度之比。在調光設定信號DS 為最小值時，燈管30的燈管發光亮度比為1〇〇%，表示全 亮’在調光設定信號DS大於最小值且小於最低調光設定 值DSC時，燈管30的燈管發光亮度比係線性變化，亦即 燈管發光亮度比隨著調光設定信號DS的遞增而遞減，且 在調光設定信號DS為最低調光設定值DSC時，燈管發光 0 壳度比為臨界燈管發光亮度比TC，。但是在調光設定信號 DS等於或低於最低調光設定值DSC時，燈管3〇的燈管發 光亮度比為0%，表示全暗。因此，燈管3〇的燈管發光亮 度比係在100%至臨界燈管發光亮度比TC之間，藉以避免 過低亮度產生非均一性而影響顯示器所顯示的整體影像 品質。 參閱第四圖’本發明第二實施例之顯示器亮度均一性 Q 控制方法的示意圖。如第四圊所示，本發明的第二實施例 具有第三調光特性曲線L3、第四調光特性曲線L4與第五 調光特性曲線L5，其中第三調光特性曲線L3具有第一斜 率’顯示調光設定信號DS小於第二調光設定信號DS2時， 燈管發光亮度比係在1〇〇%至第二燈管發光亮度比T2之間 做線性變化，第四調光特性曲線L4具有第二斜率，顯示 調光設定信號DS大於第二調光設定信號DS2且小於第一 凋光设定信號DS1時’燈管發光亮度比係在第二燈管發光 6 201033996 亮度比T2至第一燈管發光亮度比T1之間做線性變化，而 第五調光特性曲線L5如同上述第一實施例的第二調光特 性曲線L2，低於第一燈管發光亮度比Ή的發光亮度便是 全暗0%。第一斜率的絕對值大於第二斜率的絕對值，亦即 第三調光特性曲線L3比第四調光特性曲線L4還陡。 本發明的燈管30可包括冷陰極燈管（c〇ld Cath〇deΦ-like LCD display has the function of adjusting the brightness of the screen by itself. Users can adjust the appropriate brightness according to (10) preferences and habits, although the brightness of personal habits is different, but most of them are within the range of -, so generally The LCD display does not have the function of adjusting to full brightness and full darkness, but is in between. However, in some special use environments, such as maritime computers 'often in her dark environment (4), if the hoisting degree is still used, the user will feel quite glaring, so the brightness needs to be adjusted to a very low level. . Dimming is a technology for such an environment. Good dimming can even adjust the brightness of the display from 100% to 〇% ’ to meet various usage requirements. Referring to the first figure, it is a schematic diagram of display brightness control of the prior art. As shown in the first figure, the brightness of the lamp is linearly changed from the dimming setting signal with respect to the external input, wherein the dimming setting signal can be a plurality of bit signals, or an analog signal with a specific signal intensity. The brightness ratio gradually changes linearly from 1% to (10) depending on the global setting range. However, when the brightness of the lamp is adjusted to close to 〇%, the driving current of 201033996 is not weak at this time, which often causes uneven brightness of the display, which affects the overall quality of the enamel. Therefore, there is a need for a display brightness uniformity control method that utilizes different dimming speeds to optimize brightness adjustment for different brightness segments, improving the dimming effect of the display in high and medium brightness, while maintaining the brightness at low brightness. The uniformity of brightness is used to solve the shortcomings of the above-mentioned prior art. SUMMARY OF THE INVENTION The main object of the present invention is to provide a brightness uniformity control method for a display, which adjusts the optimal light-emitting redundancy of the lamp according to an external dimming setting signal, wherein the brightness of the desired lamp is lower than a certain brightness. At the lower limit, the lamp is turned off directly to jump to the full darkness to avoid uneven brightness and affect the overall image quality when the brightness of the lamp is too low. Another object of the present invention is to provide a display brightness uniformity control method that is less sensitive to changes in brightness for a human eye at high brightness and sharper for changes in temperature at low redundancy, and thus is higher In the brightness section, the brightness of the display tube is adjusted faster, and the money is adjusted in the lower brightness section. [Embodiment] The embodiments of the present invention will be described in more detail below with reference to the drawings and the reference numerals, and can be implemented by those skilled in the art after studying this specification. 4 201033996 Referring to the second figure, a schematic diagram of a dimming system for the brightness uniformity control method of the display of the present invention. As shown in the second figure, the dimming system includes a dimming controller 10, a lamp driver 20, and at least one lamp 3〇, wherein the dimming controller 10 receives an externally input dimming setting signal DS, such as a general The 〇n-Screen Display (OSD) technology is used to set the desired display brightness, that is, to control the brightness of the lamp. The dimming controller 10 generates a lamp control signal LC, and the lamp ❹ driver 20 receives the lamp control signal LC and generates a dimming drive signal DD ' to illuminate the lamp 30 and control the brightness of the lamp 3 》. The dimming setting signal DS coefficient bit signal, that is, has a high level or a low level, and the lamp control signal LC can be an analog signal or a digital signal. Taking a Light Emitting Diode (LED) tube as an example, the LED tube is driven by current, so it needs to be driven by a constant current. The larger the current, the more the tube is, so the dimming drive of the tube driver 2〇 The signal is a constant current driving signal of the analogy of φ, and the lamp driver 20 has a feedback mechanism to maintain a stable current output. The feedback mechanism is a conventional technique and will not be described herein. Referring to the second figure, a schematic diagram of a display brightness uniformity control method according to a first embodiment of the present invention. As shown in the third figure, the first embodiment of the present invention has a first dimming characteristic curve L1 and a second dimming characteristic curve L2, which are the dimming controller 1〇 of the second figure, the lamp driver 2〇, and The lamp tube 3〇 is generated, wherein the fifth cycle light characteristic curve L1 is a diagonal line, and the second dimming characteristic 201033996 curve L2 is a vertical line. The brightness of the lamp in the figure is the ratio of the brightness of the lamp of the lamp to the brightness of the lamp of the full lamp. When the dimming setting signal DS is at a minimum value, the lamp tube brightness ratio of the lamp tube 30 is 1〇〇%, indicating that the light is set to “full light” when the dimming setting signal DS is greater than the minimum value and less than the lowest dimming setting value DSC. The luminous brightness ratio of the tube of the tube 30 changes linearly, that is, the luminous brightness ratio of the tube decreases as the dimming setting signal DS increases, and when the dimming setting signal DS is the lowest dimming setting value DSC, the tube emits light. 0 The shell ratio is the critical tube lumen brightness ratio TC. However, when the dimming setting signal DS is equal to or lower than the minimum dimming setting value DSC, the lamp tube brightness ratio of the lamp tube 3〇 is 0%, indicating that it is completely dark. Therefore, the brightness of the lamp of the lamp tube 3 is between 100% and the brightness ratio TC of the threshold tube, so as to avoid the non-uniformity of the low brightness and affect the overall image quality displayed by the display. Referring to the fourth figure, a schematic diagram of a display brightness uniformity Q control method according to a second embodiment of the present invention. As shown in the fourth drawing, the second embodiment of the present invention has a third dimming characteristic curve L3, a fourth dimming characteristic curve L4 and a fifth dimming characteristic curve L5, wherein the third dimming characteristic curve L3 has the first When the slope 'display dimming setting signal DS is smaller than the second dimming setting signal DS2, the lamp brightness ratio is linearly changed from 1〇〇% to the second tube brightness ratio T2, and the fourth dimming characteristic curve L4 has a second slope, and when the dimming setting signal DS is greater than the second dimming setting signal DS2 and smaller than the first dimming setting signal DS1, the 'light tube illumination ratio is based on the second tube illumination 6 201033996 brightness ratio T2 to The first lamp has a linear change in luminance ratio T1, and the fifth dimming characteristic L5 is lower than the second dimming characteristic L2 of the first embodiment, and lower than the luminance of the first lamp. It is all dark 0%. The absolute value of the first slope is greater than the absolute value of the second slope, that is, the third dimming characteristic curve L3 is steeper than the fourth dimming characteristic curve L4. The lamp tube 30 of the present invention may comprise a cold cathode lamp (c〇ld Cath〇de)
Fluorescent Lamp ’ CCFL) ’此時燈管驅動器2〇便是反 © 流器（Inverter)，而第二圖的調光驅動信號DD為高壓交 流電的信號。 以上所述者僅為用以解釋本發明之較佳實施例，並 非企圖據以對本發明做任何形式上之限制，是以，凡有 在相同之發明精神下所作有關本發明之任何修飾或變 更，皆仍應包括在本發明意圖保護之範嘴。 . 【圖式簡單說明】 第一圖為習知技術之顯示器亮度控制的示意圖。 第-圖為本發明顯不||亮度均—性㈣方法的調光系統 之不意圖。 第三圖為本發明第—實施例之顯示ϋ亮度均-性控制方 法的示意圖。 第四圖為本發明第二實施例之顯示器亮度均—性控制方 法的示意圖。 7 201033996 【主要元件符號說明】 10調光控制器 20燈管驅動器 30燈管 DS調光設定信號 DSC最低調光設定值 DD調光驅動信號 DS1第一調光設定值 ❹ DS2第二調光設定值 L1第一調光特性曲線 L2第二調光特性曲線 L3第三調光特性曲線 L4第四調光特性曲線 L5第五調光特性曲線 LC燈管控制信號 參 T1第一燈管發光亮度比 T2第二燈管發光亮度比 TC臨界燈管發光亮度比Fluorescent Lamp ’ CCFL) ' At this time, the lamp driver 2 is a reverse inverter, and the dimming drive signal DD of the second diagram is a high voltage AC signal. The above is only a preferred embodiment for explaining the present invention, and is not intended to limit the present invention in any way, and any modifications or alterations to the present invention made in the spirit of the same invention. All should still be included in the scope of the invention intended to be protected. [Simple Description of the Drawings] The first figure is a schematic diagram of the brightness control of the display of the prior art. The first-figure is not intended for the dimming system of the method of displaying the luminance uniformity (4). The third figure is a schematic diagram showing the method of controlling the brightness uniformity of the first embodiment of the present invention. The fourth figure is a schematic diagram of a brightness uniformity control method for a display according to a second embodiment of the present invention. 7 201033996 [Main component symbol description] 10 dimming controller 20 lamp driver 30 lamp DS dimming setting signal DSC minimum dimming setting value DD dimming driving signal DS1 first dimming setting value ❹ DS2 second dimming setting Value L1 first dimming characteristic curve L2 second dimming characteristic curve L3 third dimming characteristic curve L4 fourth dimming characteristic curve L5 fifth dimming characteristic curve LC lamp control signal t1 first lamp tube brightness ratio T2 second tube luminous brightness ratio TC critical tube luminous brightness ratio