200923890 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種伽瑪電壓產生模組、顯示裝置及其 控制方法。 【先前技術】 隨著電腦的普及，許多資訊設備不斷地推陳出新，其 設計係以輕、薄、短、小為主要設計走向。在顯示裝置方 面，常用的顯示裝置有電漿顯示裝置、有機發光顯示裝置 及液晶顯示裝置等。 以液晶顯示裝置而言，其包括扭轉向列式（TN)液晶顯 示裝置、光學補償多折射式（OCB)液晶顯示裝置、垂直配 向式（Vertical Alignment, VA)液晶顯示裝置以及平面内切 換式（In-Plane Switching, IPS)液晶顯示裝置等。 一般而言，液晶顯示裝置之控制方法係藉由外加電 壓，使得液晶分子垂直扭轉，以控制光線的行進方向。然 而，此種控制方式會造成視角小的問題。為改善上述問 題，因而發展出各種相關的廣視角技術，例如多區域垂直 配向或平面内切換技術等廣視角技術。 以下，將以平面内切換式液晶顯示裝置為例說明。平 面内切換式液晶顯示裝置係藉由外加電壓，使得液晶分子 以平行玻璃基板方向進行水平轉動，使得光通過不同角度 之液晶分子後可產生不同之灰階變化，藉以顯示影像。此 種平面内切換式液晶顯示裝置，因光線始終經由液晶分子 200923890 之長軸進入使用者，因此可獲得較大的視角。因此，平面 內切換式液晶顯示裝置成為近年來熱門研究焦點之一。 然而，平面内切換式液晶顯示裝置中，因其控制晝素 之電極均位於TFT側，使得顯示晝面切換時，殘留電荷會 集中於某一方向，造成影像殘留現象。因此，如何改善平 面内切換式液晶顯示裝置之影像殘留現象，實屬當前重要 課題之一。 【發明内容】 有鑑於上述課題，本發明之目的為提供一種能夠改善 影像殘留現象之伽瑪電壓產生模組、顯示裝置及其控制方 法。 為達上述目的，本發明係提供一種伽瑪電壓產生模 組，用以產生複數個伽瑪電壓訊號以驅動一顯示面板。伽 瑪電壓產生模組係包括一電壓偏移迴路以及一伽瑪電壓 調整迴路。電壓偏移迴路係產生至少一電壓偏移訊號。伽 瑪電壓調整迴路係與電壓偏移迴路電性連接，伽瑪電壓調 整迴路係接收複數原始伽瑪電壓訊號及一共同電壓訊 號。其中，原始伽瑪電壓訊號係構成一第一伽瑪電壓對應 灰階曲線。伽瑪電壓調整迴路係依據電壓偏移訊號平移第 一伽瑪電壓對應灰階曲線，並輸出複數伽瑪電壓訊號。 為達上述目的，本發明提供一種顯示裝置係包括一顯 示面板、一源極驅動模組、一閘極驅動模組以及一伽瑪電 壓產生模組。源極驅動模組係藉由複數資料線與顯示面板 200923890 電性連接，閘極驅動模組係藉由複數掃描線與顯示面板電 性連接。伽瑪電壓產生模組係與源極驅動模組電性連接， 且伽瑪電壓產生模組具有一電壓偏移迴路及一伽瑪電壓 調整迴路。電壓偏移迴路係產生至少一電壓偏移訊號。伽 瑪電壓調整迴路係與電壓偏移迴路電性連接，並接收複數 原始伽瑪電壓訊號及一共同電壓訊號。該等原始伽瑪電壓 訊號係構成一第一伽瑪電壓對應灰階曲線，而伽瑪電壓調 整迴路係依據電壓偏移訊號平移第一伽瑪電壓對應灰階 曲線，並輸出複數伽瑪電壓訊號。其中，源極驅動模組係 依據伽瑪電壓訊號，以傳送一影像資料至顯示面板。 為達上述目的，本發明係提供一種伽瑪電壓產生模組 之控制方法，其係包括以下步驟：接收複數個原始伽瑪電 壓訊號及一共同電壓訊號，其中原始伽瑪電壓訊號係構成 一第一伽碼伽瑪電壓對應灰階曲線；產生一電壓偏移訊 號；以及依據電壓偏移訊號平移第一伽瑪電壓對應灰階曲 線，並輸出一第二伽瑪電壓對應灰階曲線。 為達上述目的，本發明係提供一種顯示裝置之控制方 法包括以下步驟：接收複數個原始伽瑪電壓訊號及一共同 電壓訊號，其中原始伽瑪電壓訊號係構成一第一伽瑪電壓 對應灰階曲線；產生一電壓偏移訊號；以及依據電壓偏移 訊號平移第一伽瑪電壓對應灰階曲線，並輸出一第二伽瑪 電壓對應，灰階曲線。 承上所述，因依據本發明之一種伽瑪電壓產生模組、 顯示裝置及其控制方法，係藉由電壓偏移迴路產生偏移訊 200923890 號，平移第-伽瑪電壓對應灰階曲線，藉以改善影像殘留 問題。 【實施方式】 以下將參照相關圖式，說明依據本發明複數實 $瑪電壓產生模組、顯示裝置及其控制方法。 星二實施例 j括“'、、、圖1所不，本發明第一實施例之液晶顯示裝置 加瑪電壓產生模組u、一顯示面板15、—源極驅 传ίΠ及1極驅動模組17。伽瑪電壓產生模組11 ==原極驅動模組16電性連接，而源極驅動模組 由锼數資料線D,〜D齒辟-^ , 承猎 動模組〗7H、/ 板電性連接，且閘極驅 接。、 ”猎複數掃描線Sl〜Sn與顯示面板I5電性連 壓產射"if n係分別為一正整數。於實施上，伽瑪電 而顯-/系可㈣—平面内切換式液晶顯示模組， ‘，'不衣置1料—平面内切換式液晶顯示褒置。 以及生模組11係包括-伽瑪電壓調整迴路Π 偏移迴二電:迴連:1。4。伽瑪電壓調整迴路13係與電壓 請同時參照圖1盥 璧偏移迴路14係包括、、「 杨明第—實施例之電 緩衝軍-η, 分壓單元141及一緩衝單元142。 中，分：：與分？單元141電性連接。於本實施例 單元。& 1及緩衝單元142係可整合為-電麼偏移 200923890 分壓單元141包括複數阻抗，其係以串聯連接，其中， 該等阻抗係包括一電容及/或一電阻，而電阻係可為一固定 電阻或一可變電阻。於本實施例中，分壓單元141係以一 電阻R與一可變電阻VR串聯為例。 分壓單元141係接收一電壓訊號Vcc，並經由電阻R 及可變電阻VR分壓後，以輸出一電壓偏移訊號VQffset，並 傳送至緩衝單元142。於實施上，可變電阻VR係可為一 熱敏電阻。由於熱敏電阻係依據環境溫度變化，而改變其 電阻值，因此，本實施例之顯示裝置1具有溫度補償功能。 緩衝單元142係包括一運算放大器OP，其係接收電 壓偏移訊號VQffset，並將其傳送至伽瑪電壓調整迴路13。 於實施上，電壓偏移訊號 ^offset 係為一直流電壓。 請繼續參照圖2所示，伽瑪電壓產生迴路13具有複 數伽瑪電壓調整單元131，且各伽瑪電壓調整單元131係 接收相對應之原始伽瑪電壓訊號VG1〜VGN及一共通電壓訊 號VCQm。於本貫施例中’原始伽瑪電壓訊號Vg 1〜Vgn係構 成如圖3所示之一第一伽瑪電壓對應灰階曲線G1。其中， 圖3代表0〜255灰階，即8位元，其對應電壓之關係圖。 伽瑪電壓調整迴路13係依據電壓偏移訊號VQffset以平 移第一伽瑪電壓對應灰階曲線G1，並輸出複數伽瑪電壓訊 號VGA1〜VGAN至源極驅動模組16。源極驅動模組16係依 據該等伽瑪電壓訊號 V〇Al~V〇AN 5 以傳送一影像資料至顯 示面板15。 更詳細來說，於平移第一伽瑪電壓對應灰階曲線G1 10 200923890 時，係依據電壓偏移訊號vDffset調整各原始伽瑪電壓訊號 VG广VGN之大小，以平移第一伽瑪電壓對應灰階曲線G1。 例如 VGAl^VGl+Voffset ’ VGA2=VG2+V〇ffset，以此類推。 或者，使用者可以針對至少二原始伽瑪電壓訊號 VG广VGN，藉由電壓偏移訊號VQffset調整該原始伽瑪電壓 訊號VG广VGN之大小，以平移第一伽瑪電壓對應灰階曲線 G1。例如調整第一伽瑪電壓對應灰階曲線G1之灰階值為 第255階及第0階之原始伽瑪電壓訊號大小。 於此，電壓偏移訊號VQffset例如是0.25 V，而伽瑪電 壓訊號V〇ai〜Vgan 係構成如圖3所示之一第二伽瑪電壓對 應灰階曲線G2。 值得注意的是，依據實驗結果得知，顯示裝置1之伽 瑪曲線為第一伽瑪電壓對應灰階曲線G1時，則其影像殘 留時間約為21秒。當液晶顯示裝置1之伽碼曲線為第二 伽瑪電壓對應灰階曲線G2時，其影像殘留時間大幅降低 至5秒。因此，本發明之顯示裝置1係可改善影像殘留現 象。 第二實施例 請參照圖4所示，與第一實施例不同處在於，本實施 例之電壓偏移迴路14’係包括一控制單元143及一數位類 比轉換單元144。數位類比轉換單元144係與控制單元143 電性連接。 控制單元143係接收一外部輸入訊號並輸出一數位偏 移訊號至數位類比轉換單元144。數位類比轉換單元144 11 200923890 依據數位偏移訊號輸出電壓偏移訊號vQffset。於本實施例 中，控制單元143係為一中央處理單元或一微控制單元。 然而，於本實施例中，並非限制控制單元143之輸出 須為一數位偏移訊號。控制單元143係可直接輸出一電壓 偏移 δίΐ 號 VQffset， 此時，數位類比轉換單元144則可以省 略。 請參照圖5所示，本發明之較佳實施例之伽瑪電壓產 生模組及顯示裝置之控制方法係包括步驟S11至步驟S13。 步驟S11係接收複數原始伽瑪電壓訊號及一共同電壓 訊號。其中，該等原始伽瑪電壓訊號係構成一第一伽瑪電 壓對應灰階曲線。步驟S12係產生一電壓偏移訊號。步驟 S13依據電壓偏移訊號平移該第一伽碼伽瑪電壓對應灰階 曲線，並輸出一第二伽瑪電壓對應灰階曲線。 由於伽瑪電壓產生模組及顯示裝置之控制方法已於 上述實施例中一併說明，故於此不再加以贅述。 綜上所述，因依據本發明之一種伽瑪電壓產生模組、 顯示裝置及其控制方法，係藉由電壓偏移迴路產生偏移訊 號以平移第一伽瑪電壓對應灰階曲線，藉以改善影像殘留 問題，進而提升顯示品質。 以上所述僅為舉例性，而非為限制性者。任何未脫離 本發明之精神與範_，而對其進行之等效修改或變更，均 應包括於後附之申請專利範圍中。 【圖式簡單說明】 12 200923890 圖1為顯示顯示依本發明第一實施例之顯示F 示意圖； 、夏又一 圖2為顯示顯示依本發明第一實施例之伽瑪電壓 模組之一局部示意圖； 圖3為顯示顯示依本發明第一及第二實施例 壓對應灰階㈣之-示意圖； 馬電 圖4為顯示顯示依本發明第二實施例之伽碼電壓產生 板組之一局部示意圖；以及 圖5為顯示依據本發明較佳實施例之伽瑪電壓產生模 組及顯示裝置之控制方法之一流程圖。 、 【主要元件符號說明】 1 :顯示裝置 11 ： 伽瑪電壓產生模組 13 ： :伽瑪電壓調整迴路 131 •伽瑪電壓調整單元 14、 14’ ：電壓偏移迴路 141 :分壓單元 142 :緩衝單元 143 •'控制單元 144 .數位類比轉換單元 15 ： 顯示面板 16 ： 源極驅動模組 17 ： 閉椏驅動模組 13 200923890 D1〜Dm ·資料線 G1、G2 :伽瑪電壓對應灰階曲線 OP :運算放大器 R、VR :電阻 S11〜S13 :步驟 S!〜Sn .掃描線200923890 IX. Description of the Invention: [Technical Field] The present invention relates to a gamma voltage generating module, a display device, and a control method therefor. [Prior Art] With the popularity of computers, many information devices continue to evolve, and their design is designed to be light, thin, short, and small. In the display device, commonly used display devices include a plasma display device, an organic light-emitting display device, and a liquid crystal display device. In the case of a liquid crystal display device, it includes a twisted nematic (TN) liquid crystal display device, an optically compensated multi-refractive (OCB) liquid crystal display device, a vertical alignment (VA) liquid crystal display device, and an in-plane switching type ( In-Plane Switching, IPS) liquid crystal display devices, etc. In general, the control method of the liquid crystal display device is such that the liquid crystal molecules are vertically twisted by an applied voltage to control the traveling direction of the light. However, this type of control can cause problems with a small viewing angle. In order to improve the above problems, various related wide viewing angle technologies, such as multi-area vertical alignment or in-plane switching technology, have been developed. Hereinafter, an in-plane switching liquid crystal display device will be described as an example. The in-plane switching liquid crystal display device horizontally rotates the liquid crystal molecules in the direction of the parallel glass substrate by applying a voltage, so that the light passes through the liquid crystal molecules of different angles to generate different gray scale changes, thereby displaying the image. Such an in-plane switching liquid crystal display device can obtain a large viewing angle because light always enters the user through the long axis of the liquid crystal molecules 200923890. Therefore, the in-plane switching liquid crystal display device has become one of the hot research focuses in recent years. However, in the in-plane switching liquid crystal display device, since the electrodes for controlling the pixels are located on the TFT side, the residual charge is concentrated in a certain direction when the display pupil is switched, resulting in image sticking. Therefore, how to improve the image sticking phenomenon in the planar switching liquid crystal display device is one of the current important topics. SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a gamma voltage generating module, a display device, and a control method thereof that can improve image sticking. To achieve the above object, the present invention provides a gamma voltage generating module for generating a plurality of gamma voltage signals for driving a display panel. The gamma voltage generating module includes a voltage offset loop and a gamma voltage trim loop. The voltage offset loop generates at least one voltage offset signal. The gamma voltage adjustment loop is electrically connected to the voltage offset loop, and the gamma voltage adjustment loop receives the complex original gamma voltage signal and a common voltage signal. The original gamma voltage signal constitutes a first gamma voltage corresponding to a gray scale curve. The gamma voltage adjustment loop shifts the gray scale curve corresponding to the first gamma voltage according to the voltage offset signal, and outputs a complex gamma voltage signal. To achieve the above objective, the present invention provides a display device including a display panel, a source driving module, a gate driving module, and a gamma voltage generating module. The source driving module is electrically connected to the display panel 200923890 by a plurality of data lines, and the gate driving module is electrically connected to the display panel by a plurality of scanning lines. The gamma voltage generating module is electrically connected to the source driving module, and the gamma voltage generating module has a voltage offset loop and a gamma voltage adjusting loop. The voltage offset loop generates at least one voltage offset signal. The gamma voltage adjustment loop is electrically connected to the voltage offset loop and receives the plurality of original gamma voltage signals and a common voltage signal. The original gamma voltage signals form a first gamma voltage corresponding gray scale curve, and the gamma voltage adjustment loop shifts the first gamma voltage corresponding gray scale curve according to the voltage offset signal, and outputs a complex gamma voltage signal . The source driving module is configured to transmit an image data to the display panel according to the gamma voltage signal. To achieve the above objective, the present invention provides a method for controlling a gamma voltage generating module, comprising the steps of: receiving a plurality of original gamma voltage signals and a common voltage signal, wherein the original gamma voltage signal constitutes a first A gamma gamma voltage corresponds to a gray scale curve; generating a voltage offset signal; and translating the first gamma voltage corresponding gray scale curve according to the voltage offset signal, and outputting a second gamma voltage corresponding gray scale curve. To achieve the above objective, the present invention provides a control method for a display device comprising the steps of: receiving a plurality of original gamma voltage signals and a common voltage signal, wherein the original gamma voltage signals form a first gamma voltage corresponding gray scale a curve; generating a voltage offset signal; and translating the first gamma voltage corresponding gray scale curve according to the voltage offset signal, and outputting a second gamma voltage corresponding to the gray scale curve. According to the present invention, a gamma voltage generating module, a display device and a control method thereof according to the present invention generate an offset signal 200923890 by a voltage offset loop, and a panning gamma voltage corresponding to a gray scale curve. In order to improve the image residue problem. [Embodiment] Hereinafter, a complex digital voltage generating module, a display device, and a control method thereof according to the present invention will be described with reference to the related drawings. The second embodiment of the present invention includes "',, and FIG. 1, the liquid crystal display device of the first embodiment of the present invention, the voltage generating module u, a display panel 15, the source driving and the driving mode. Group 17. The gamma voltage generating module 11 == the primary driving module 16 is electrically connected, and the source driving module is composed of the number of data lines D, D D D D D D D D D D D D D D D D D D / The board is electrically connected, and the gate is connected. The "hunting complex scanning line S1~Sn and the display panel I5 are electrically connected to each other" is a positive integer. In terms of implementation, the gamma-electrical-/---(4)-in-plane switching liquid crystal display module, ‘,’ is not equipped with a material-in-plane switching liquid crystal display device. And the raw module 11 includes a gamma voltage adjustment loop 偏移 offset back to the second power: back connection: 1.4. The gamma voltage adjustment circuit 13 and the voltage are simultaneously referred to FIG. 1 , and the offset circuit 14 includes, and the "Yang Ming - the electric buffering unit - η of the embodiment, the voltage dividing unit 141 and a buffer unit 142. The sub-unit: is electrically connected to the sub-unit 141. In the present embodiment, the unit & 1 and the buffer unit 142 can be integrated into an electric-displacement 200923890. The voltage dividing unit 141 includes a complex impedance, which is connected in series, wherein The impedance system includes a capacitor and/or a resistor, and the resistor system can be a fixed resistor or a variable resistor. In this embodiment, the voltage dividing unit 141 is connected in series with a variable resistor VR by a resistor R. For example, the voltage dividing unit 141 receives a voltage signal Vcc and divides it by a resistor R and a variable resistor VR to output a voltage offset signal VQffset and transmits it to the buffer unit 142. In practice, the variable resistor The VR system can be a thermistor. Since the thermistor changes its resistance value according to the change of the ambient temperature, the display device 1 of the present embodiment has a temperature compensation function. The buffer unit 142 includes an operational amplifier OP. Receiving electricity The voltage offset signal VQffset is transmitted to the gamma voltage adjustment circuit 13. In practice, the voltage offset signal ^offset is a DC voltage. Continuing to refer to FIG. 2, the gamma voltage generation circuit 13 has a complex number. The gamma voltage adjustment unit 131, and each gamma voltage adjustment unit 131 receives the corresponding original gamma voltage signals VG1 VVGN and a common voltage signal VCQm. In the present embodiment, the 'original gamma voltage signal Vg 1~ The Vgn system constitutes a first gamma voltage corresponding gray scale curve G1 as shown in FIG. 3. wherein, FIG. 3 represents a 0 to 255 gray scale, that is, an 8-bit, and its corresponding voltage relationship diagram. Gamma voltage adjustment loop 13 According to the voltage offset signal VQffset, the first gamma voltage corresponding to the gray scale curve G1 is translated, and the complex gamma voltage signals VGA1 VGA VGAN are outputted to the source driving module 16. The source driving module 16 is based on the gamma The voltage signal V〇Al~V〇AN 5 is used to transmit an image data to the display panel 15. More specifically, when the first gamma voltage is shifted to the gray scale curve G1 10 200923890, the voltage offset signal vDffset is adjusted. Primitive gamma The voltage signal VG is wide VGN, to translate the first gamma voltage corresponding to the gray scale curve G1. For example, VGAl^VGl+Voffset ' VGA2=VG2+V〇ffset, and so on. Alternatively, the user can target at least two original gamma The voltage signal VG wide VGN is adjusted by the voltage offset signal VQffset to adjust the size of the original gamma voltage signal VG wide VGN to translate the first gamma voltage corresponding to the gray scale curve G1. For example, adjusting the first gamma voltage corresponding gray scale The gray scale value of the curve G1 is the original gamma voltage signal size of the 255th order and the 0th order. Here, the voltage offset signal VQffset is, for example, 0.25 V, and the gamma voltage signals V〇ai to Vgan constitute a second gamma voltage corresponding to the gray scale curve G2 as shown in FIG. It is worth noting that, according to the experimental results, when the gamma curve of the display device 1 is the first gamma voltage corresponding to the gray scale curve G1, the image residual time is about 21 seconds. When the gamma curve of the liquid crystal display device 1 is the second gamma voltage corresponding to the gray scale curve G2, the image residual time is drastically reduced to 5 seconds. Therefore, the display device 1 of the present invention can improve image sticking. Second Embodiment Referring to Fig. 4, the difference from the first embodiment is that the voltage offset circuit 14' of the present embodiment includes a control unit 143 and a digital analog conversion unit 144. The digital analog conversion unit 144 is electrically connected to the control unit 143. The control unit 143 receives an external input signal and outputs a digital offset signal to the digital analog conversion unit 144. The digital analog conversion unit 144 11 200923890 outputs a voltage offset signal vQffset according to the digital offset signal. In this embodiment, the control unit 143 is a central processing unit or a micro control unit. However, in the present embodiment, the output of the control unit 143 is not limited to a digital offset signal. The control unit 143 can directly output a voltage offset δίΐ number VQffset, and at this time, the digital analog conversion unit 144 can be omitted. Referring to FIG. 5, the gamma voltage generating module and the control method of the display device according to the preferred embodiment of the present invention include steps S11 to S13. Step S11 receives a plurality of original gamma voltage signals and a common voltage signal. The original gamma voltage signals form a first gamma voltage corresponding gray scale curve. Step S12 generates a voltage offset signal. Step S13: shifting the first gamma gamma voltage corresponding gray scale curve according to the voltage offset signal, and outputting a second gamma voltage corresponding gray scale curve. Since the gamma voltage generating module and the control method of the display device have been described in the above embodiments, they will not be described again. In summary, according to the gamma voltage generating module, the display device and the control method thereof according to the present invention, the offset signal is generated by the voltage offset circuit to translate the first gamma voltage corresponding gray scale curve, thereby improving Image retention issues, which in turn improve display quality. The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations of the present invention are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS 12 200923890 FIG. 1 is a schematic view showing a display F according to a first embodiment of the present invention; and FIG. 2 is a view showing a part of a gamma voltage module according to a first embodiment of the present invention. 3 is a schematic view showing a corresponding gray scale (four) according to the first and second embodiments of the present invention; and FIG. 4 is a partial view showing a portion of the gamma voltage generating panel according to the second embodiment of the present invention. FIG. 5 is a flow chart showing a gamma voltage generating module and a control method of the display device according to a preferred embodiment of the present invention. [Description of main component symbols] 1 : Display device 11 : Gamma voltage generation module 13 : : Gamma voltage adjustment circuit 131 • Gamma voltage adjustment unit 14 , 14 ' : Voltage offset circuit 141 : Voltage dividing unit 142 : Buffer unit 143 • 'Control unit 144. Digital analog conversion unit 15 : Display panel 16 : Source drive module 17 : Closed drive module 13 200923890 D1 ~ Dm · Data lines G1, G2 : Gamma voltage corresponding gray scale curve OP: Operational amplifier R, VR: Resistor S11~S13: Step S!~Sn. Scanning line
Vcc、Vcom、V0ffset :電壓訊號Vcc, Vcom, V0ffset: voltage signal
VgI〜Vgn、V〇Al〜VGAN :伽瑪電壓訊號 14VgI~Vgn, V〇Al~VGAN: Gamma voltage signal 14