TWI460504B

TWI460504B - Backlight module and diffuser plate having patterned dots thereof

Info

Publication number: TWI460504B
Application number: TW097150978A
Authority: TW
Inventors: Po Iem Lin; Ya Hua Ko; Hsin Wu Lin
Original assignee: Au Optronics Corp
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2014-11-11
Also published as: TW201024860A

Description

具有網點圖案的背光模組及其擴散板結構Backlight module with dot pattern and diffusion plate structure thereof

本發明係關於一種背光模組及其擴散板結構，特別是有關於一種具有網點圖案的擴散板結構，以及應用該擴散板結構之背光模組，該背光模組可適用於液晶顯示器。The present invention relates to a backlight module and a diffusing plate structure thereof, and more particularly to a diffusing plate structure having a dot pattern and a backlight module using the diffusing plate structure, and the backlight module is applicable to a liquid crystal display.

由於液晶顯示技術的快速發展與進步，液晶顯示器的應用相當普及，廣泛應用於各種電子產品，例如：電腦螢幕與液晶電視。然而，因為液晶顯示器並非自發光型的顯示器，故需使用背光模組以產生背光。在直下式(direct light)的背光模組中，光源係分佈排列於擴散板與反射片之間。一般而言，當背光模組進行薄型化或是節能的設計時，由於其使用的光源數量較少，導致背光模組產生的背光容易有亮度分佈不均勻的情形，而在顯示畫面形成亮暗的條紋分佈(mura)。Due to the rapid development and advancement of liquid crystal display technology, the application of liquid crystal display is quite popular, and is widely used in various electronic products, such as computer screens and LCD TVs. However, since the liquid crystal display is not a self-illuminating type display, it is necessary to use a backlight module to generate a backlight. In a direct light backlight module, a light source is arranged between the diffusion plate and the reflection sheet. In general, when the backlight module is thinned or energy-saving, the backlight used in the backlight module tends to have uneven brightness distribution due to the small number of light sources used, and the display screen is bright and dark. The distribution of stripes (mura).

為了克服前述亮暗條紋分佈的問題，在背光模組的擴散板上設計網點圖案，以使背光的亮度分佈能夠均勻化。請參閱第1圖，其為習知技術中，擴散板的網點尺寸分佈函數圖，該分佈函數係為多階(polynomial)曲線函數，例如：至少二階以上的曲線函數。第1圖的橫軸座標表示網點距離，即網點圖案中各網點相距於基準光源的距離，12.5mm表示該基準光源的位置，0mm與25mm則表示該基準光源與另一相鄰光源相距之中心位置。縱軸表示網點圖案中每一網點的尺寸，網點尺寸為網點距離的函數。因為該函數為多階曲線函數，故網點尺寸隨著該網點距離的分佈甚為複雜，因此不利於大量、快速的生產製造。In order to overcome the problem of the distribution of the bright and dark stripes, a dot pattern is designed on the diffusion plate of the backlight module to make the brightness distribution of the backlight uniform. Please refer to FIG. 1 , which is a plot of a dot size distribution function of a diffusion plate in a prior art. The distribution function is a polynomial curve function, for example, a curve function of at least two orders or more. The horizontal axis coordinate of Fig. 1 indicates the dot distance, that is, the distance of each dot in the dot pattern from the reference light source, 12.5 mm indicates the position of the reference light source, and 0 mm and 25 mm indicates the center of the reference light source from another adjacent light source. position. The vertical axis represents the size of each dot in the dot pattern, and the dot size is a function of the dot distance. Because the function is a multi-order curve function, the dot size is very complicated with the distribution of the dot distance, which is not conducive to large-scale and rapid manufacturing.

而當背光模組進行薄型化，即需要縮減擴散板與反射片之間的混光高度(height,H)，且光源之間的光源間距(pitch,P)固定時，該光源間距與混光高度的比值P/H會增加，導致亮暗的條紋分佈更為明顯，故需要針對薄型化的背光模組，另外設計一種新的網點分佈函數，再再加深其設計的複雜度與量產的困難度。When the backlight module is thinned, that is, the height (H) of the diffusing plate and the reflecting sheet needs to be reduced, and the distance between the light sources (pitch, P) is fixed, the light source is spaced and mixed. The height ratio P/H will increase, resulting in a brighter and darker stripe distribution. Therefore, it is necessary to design a new dot distribution function for the thinned backlight module, and then deepen the complexity and mass production of the design. Difficulty.

另外，當背光模組進行節能設計，而降低光源的數量時，即光源之間的光源間距(pitch)增加，擴散板與反射片之間的混光高度(height)固定時，光源間距與混光高度的比值P/H也會增加，亦會導致亮暗的條紋分佈更為明顯，而需要針對進行節能設計的背光模組，另外設計另一種新的網點分佈函數，亦會對背光模組的設計性與製造性造成不良的影響。可以想見，當同時進行薄型化與節能設計時，為降低亮暗條紋的視覺效應，需要花費更多的心力進行調整，而且不一定能夠獲得良好的效果。In addition, when the backlight module performs energy-saving design and reduces the number of light sources, that is, the pitch of the light source between the light sources increases, and the light mixing height between the diffusion plate and the reflection sheet is fixed, the light source spacing and mixing The ratio of light height P/H will also increase, which will result in a brighter and darker stripe distribution. It is necessary to design a backlight module for energy saving design, and another new dot distribution function, which will also be a backlight module. The design and manufacturing properties have a negative impact. It is conceivable that when the thinning and energy-saving design are simultaneously carried out, in order to reduce the visual effect of the light and dark stripes, it takes more effort to adjust, and it is not necessarily good.

請參考第2圖，其為習知技術中擴散板的亮度百分比與網點距離之波形示意圖。其中，橫軸表示網點圖案中之各網點相距於基準光源的距離，即網點距離(mm)，0mm表示該基準光源的位置，-21.3mm表示位於基準光源一側的相鄰光源的位置，21.3mm、42.6mm分別表示位於基準光源另一側的其它光源的位置；縱軸表示光源在擴散板的對應位置處，所形成的亮度百分比(%)，其會隨著網點距離的不同，而有亮度百分比的起伏變化。其中，亮度百分比100%表示在習知技術中的平均亮度值，若以此平均亮度值作為比較基準，則較此平均值亮度高者即會超過100%，反之則會低於100%。Please refer to FIG. 2 , which is a waveform diagram of the brightness percentage and the dot distance of the diffusion plate in the prior art. Wherein, the horizontal axis represents the distance of each dot in the dot pattern from the reference light source, that is, the dot distance (mm), 0 mm represents the position of the reference light source, and -21.3 mm represents the position of the adjacent light source on the side of the reference light source, 21.3 Mm, 42.6mm respectively indicate the position of other light sources located on the other side of the reference light source; the vertical axis represents the percentage (%) of brightness formed by the light source at the corresponding position of the diffusing plate, which will vary with the distance of the dots. Fluctuations in the percentage of brightness. Wherein, the brightness percentage is 100%, which represents the average brightness value in the prior art. If the average brightness value is used as a comparison reference, the brightness higher than the average value will exceed 100%, and vice versa.

C1曲線表示擴散板並未設置網點圖案的亮度百分比波形，在光源所在之-21.3mm、0mm、21.3mm與42.6mm的位置附近，光源所對應形成的亮度百分比較高，具有明顯的波峰值。然而，在相鄰光源之間，即-10.65mm、10.65mm與32mm的位置附近，光源所對應形成的亮度百分比較低，具有明顯的波谷值，在波峰與波谷的交替之下，光源所對應形成的亮度百分比之間，高達12%左右的明顯差異，以致於在顯示畫面形成不佳的亮暗條紋。The C1 curve indicates that the diffuser plate does not have a brightness percentage waveform of the dot pattern. Near the positions of -21.3 mm, 0 mm, 21.3 mm, and 42.6 mm where the light source is located, the light source has a higher percentage of brightness corresponding to the light source and has a distinct peak value. However, near the positions of adjacent light sources, ie -10.65mm, 10.65mm and 32mm, the light source has a lower percentage of brightness and has a distinct trough value. Under the alternation of the peaks and troughs, the light source corresponds. Between the percentages of brightness formed, there is a significant difference of up to about 12%, so that poor light and dark stripes are formed on the display.

C2曲線表示擴散板設置有網點圖案時的亮度百分比之波形，網點的分佈函數亦為多階曲線函數。由於多階曲線函數網點的作用，在-21.3mm、0mm、21.3mm與42.6mm的光源位置附近，光源所對應形成的亮度百分比相較於C1曲線急劇下降約12%左右，而在-10.65mm、10.65mm與32mm的位置附近，光源所對應形成的亮度百分比則上升約4%左右，C2曲線整體的亮度百分比的變化約為8%左右，在光源與光源位置之間的暗帶雖然有改善，但是在-21.3mm、0mm、21.3mm與42.6mm的光源位置附近，相較於其它位置之亮度百分比明顯較低，如A1區域以及A2區域所示，因而在光源所在之-21.3mm、0mm、21.3mm與42.6mm的位置上方，反而會形成不佳的暗帶條紋(mura)。有鑒於此，確有必要對習知的背光模組之擴散板進行改善。The C2 curve represents the waveform of the percentage of brightness when the diffuser plate is provided with the dot pattern, and the distribution function of the dot is also a multi-order curve function. Due to the effect of the multi-order curve function dot, the percentage of brightness formed by the light source is about 12% lower than that of the C1 curve near the position of the source of -21.3mm, 0mm, 21.3mm and 42.6mm, and is at -10.65mm. Near the position of 10.65mm and 32mm, the percentage of brightness formed by the light source increases by about 4%, and the change of the brightness percentage of the whole C2 curve is about 8%. The dark band between the light source and the light source position is improved. However, in the vicinity of the source positions of -21.3mm, 0mm, 21.3mm and 42.6mm, the percentage of brightness is significantly lower than that of other positions, as shown in the A1 area and the A2 area, so the source is -21.3mm, 0mm. Above the 21.3mm and 42.6mm positions, it will form a poor dark stripe (mura). In view of this, it is indeed necessary to improve the diffusion plate of the conventional backlight module.

本發明之目的在於提供一種具有網點圖案的背光模組及其擴散板結構，消除在顯示畫面形成亮暗的條紋分佈，以改善背光模組產生亮度分佈不均勻的情形。It is an object of the present invention to provide a backlight module having a dot pattern and a diffusing plate structure thereof, which eliminates the formation of bright and dark stripes on the display screen to improve the uneven distribution of brightness of the backlight module.

為達成上述目的，本發明提供一種具有網點圖案的背光模組及其擴散板結構，可適用於顯示裝置，例如：液晶顯示器或液晶電視，該背光模組主要包括反射片、複數個光源以及擴散板。複數個光源彼此之間相距一光源間距(P)而排列於該反射片上。擴散板配置於該光源上，且與該反射片相距一混光高度(H)。其中該擴散板包含網點圖案，該網點圖案具有複數個網點，該些網點係沿著該些光源的排列方向設置，該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為該光源間距(P)之函數。換言之，依據該些線性函數的網點分佈係相關於該擴散板與該反射片之間的距離。在一較佳實施例中，該些網點係設置於該擴散板的入光面上，且面對於該些光源。該背光模組可另包括一微結構圖案，設置於該擴散板的出光面上，且背對於該些光源。In order to achieve the above object, the present invention provides a backlight module having a dot pattern and a diffusing plate structure thereof, which can be applied to a display device, such as a liquid crystal display or a liquid crystal television, and the backlight module mainly includes a reflective sheet, a plurality of light sources, and a diffusion. board. A plurality of light sources are arranged on the reflective sheet at a distance (P) from each other. The diffuser plate is disposed on the light source and is at a mixed light height (H) from the reflective sheet. The diffusion plate includes a dot pattern having a plurality of dots, the dots being disposed along an arrangement direction of the light sources, the sizes of the dots being distributed according to a plurality of linear functions, and the linear functions are The function of the distance (P) of the light source. In other words, the dot distribution according to the linear functions is related to the distance between the diffuser and the reflective sheet. In a preferred embodiment, the dots are disposed on the light incident surface of the diffuser and face the light sources. The backlight module may further include a microstructure pattern disposed on the light emitting surface of the diffusion plate and facing away from the light sources.

此外，本發明揭露一種具有網點圖案的擴散板結構，該網點圖案具有複數個網點，該些網點係沿著兩排列方向設置，該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為該些網點沿著該排列方向的分佈距離之函數。In addition, the present invention discloses a diffuser structure having a dot pattern having a plurality of dots arranged along two alignment directions, the sizes of the dots being distributed according to a plurality of linear functions, and the linearities The function is a function of the distribution distance of the dots along the alignment direction.

根據上述，本發明之具有網點圖案的背光模組及其擴散板結構，將背光模組的擴散板之入光面形成網點圖案，該網點圖案的網點尺寸依據多區域線性函數分佈，有效擴散分光來自光源的光源，解決亮度不均勻問題，以達到背光模組光均勻化的目的。According to the above aspect, the backlight module having the dot pattern and the diffusing plate structure thereof form a dot pattern on the light incident surface of the diffusing plate of the backlight module, and the dot size of the dot pattern is distributed according to a multi-region linear function, and the effective diffusion splitting is performed. The light source from the light source solves the problem of uneven brightness to achieve the purpose of uniformizing the backlight module.

為讓本發明之上述內容能更明顯易懂，下文特舉較佳實施例，並配合所附圖式，作詳細說明如下：In order to make the above-mentioned contents of the present invention more comprehensible, the preferred embodiments are described below, and the detailed description is as follows:

請參考第3圖，其為本發明背光模組300的剖面示意圖。該背光模組300主要包括背板301、反射片302、複數個光源304以及擴散板306。背板301為一凹槽型結構，可為金屬或塑膠材質所製。反射片302配置於該背板301的內部表面，可為白色或銀色材質所製。複數個光源304配置於該反射片302上，彼此之間相距一光源間距(P)，其可為冷陰極燈管(Cold Cathode Fluorescent Lamp,CCFL)、外部電極燈管(External Electrode Fluorescent Lamp,EEFL)或發光二極體(Light Emitting Diode,LED)。Please refer to FIG. 3 , which is a cross-sectional view of the backlight module 300 of the present invention. The backlight module 300 mainly includes a back plate 301, a reflection sheet 302, a plurality of light sources 304, and a diffusion plate 306. The back plate 301 is a groove type structure and can be made of metal or plastic material. The reflection sheet 302 is disposed on the inner surface of the back plate 301 and can be made of a white or silver material. A plurality of light sources 304 are disposed on the reflective sheet 302 at a distance from each other (P), which may be a Cold Cathode Fluorescent Lamp (CCFL) or an External Electrode Fluorescent Lamp (EEFL). ) or Light Emitting Diode (LED).

擴散板306配置於該光源304上，其與該反射片302相距一混光高度(H)，且可為透明導光材質所製。其中，該擴散板306包含網點圖案308，該網點圖案308具有複數個網點，如第4圖所示。該些網點係沿著該些光源304的兩排列方向設置，例如：燈管的排列方向X與燈管的軸心方向或延伸方向Y，該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為該光源間距(P)之函數。換言之，該些網點的分佈狀況，係與該擴散板與該反射片之間的距離相關。在一較佳實施例中，該些網點係設置於該擴散板306的入光面上，且面對於該些光源304。該背光模組300可另包括一微結構圖案310，設置於該擴散板306的出光面上，且背對於該些光源304。The diffuser plate 306 is disposed on the light source 304, and is spaced apart from the reflective sheet 302 by a light mixing height (H), and can be made of a transparent light guiding material. The diffusion plate 306 includes a dot pattern 308 having a plurality of dots, as shown in FIG. The plurality of dots are disposed along the two alignment directions of the light sources 304, for example, the arrangement direction X of the lamps and the axial direction or the extension direction Y of the lamps, and the sizes of the dots are distributed according to a plurality of linear functions, and These linear functions are a function of the distance (P) of the light source. In other words, the distribution of the dots is related to the distance between the diffuser and the reflective sheet. In a preferred embodiment, the dots are disposed on the light incident surface of the diffuser plate 306 and face the light sources 304. The backlight module 300 can further include a microstructure pattern 310 disposed on the light emitting surface of the diffusion plate 306 and facing away from the light sources 304.

請參考第4圖，其為本發明之一實施例中擴散板的網點排列示意圖，其係為第3圖中網點圖案308的正視圖，其中網點係沿著X方向以及Y方向排列，以光源304為冷陰極燈管或外部電極燈管為例，X方向為光源304的排列方向，Y方向則為光源304的軸心方向或延伸方向。網點尺寸在X方向上，依據複數個線性函數分佈，基準光源304設置於0mm的位置，相鄰光源304則設置於Pmm的位置，相鄰兩光源之間的中間位置則為(1/2)*Pmm。Please refer to FIG. 4 , which is a schematic diagram of a dot arrangement of a diffusion plate according to an embodiment of the present invention, which is a front view of a dot pattern 308 in FIG. 3 , wherein the dots are arranged along the X direction and the Y direction, and the light source is arranged. 304 is a cold cathode lamp or an external electrode lamp. The X direction is the arrangement direction of the light source 304, and the Y direction is the axial direction or the extension direction of the light source 304. The dot size is distributed in the X direction according to a plurality of linear functions, the reference light source 304 is set at a position of 0 mm, the adjacent light source 304 is disposed at a position of Pmm, and the intermediate position between adjacent light sources is (1/2). *Pmm.

在本實施例中，網點在Y方向上，並沒有尺寸上的變化，故位於相同X座標位置，但不同Y座標位置的網點，其網點尺寸是相同的。但在其它實施例中，網點在Y方向上，也可以有尺寸上的變化，本發明並不以此為限。另外，網點的幾何形狀可以相同，亦可為不相同，與X方向或Y方向沒有固定的對應關係。在一較佳實施例中，網點的幾何形狀係為正方形，亦可為矩形、圓形、菱形、三角形或是其它的幾何形狀。In this embodiment, the dot in the Y direction has no dimensional change, so the dots of the same X coordinate position but the different Y coordinate positions have the same dot size. However, in other embodiments, the dot may also have a dimensional change in the Y direction, and the invention is not limited thereto. In addition, the geometry of the dots may be the same or different, and there is no fixed correspondence with the X direction or the Y direction. In a preferred embodiment, the geometry of the dots is square, and may be rectangular, circular, diamond, triangular or other geometric shapes.

請參考第5A圖至第5B圖，其為本發明擴散板的網點尺寸分佈函數圖。其中，該網點圖案的網點係依據複數個線性函數分佈。請配合參考第4圖，在第5A圖之實施例中，光源間距(P)與混光高度(H)的比值P/H係介於0與1.7之間。該些網點之間的網點間距為Δx，Δx=P/N，x_i =i*(Δx)，i=0,1,2,...,N，即x_i 表示第i個網點相距於基準光源的網點距離，N為基準光源與相鄰光源之間的網點序數，i為該些網點序數的順序編號。該些線性函數為D₁₁ (x_i )與D₁₂ (x_i )，係分別以下列方程式表示：Please refer to FIG. 5A to FIG. 5B, which are diagrams of the dot size distribution function of the diffusing plate of the present invention. The dot of the dot pattern is distributed according to a plurality of linear functions. Referring to FIG. 4, in the embodiment of FIG. 5A, the ratio P/H of the light source pitch (P) to the light mixing height (H) is between 0 and 1.7. The dot spacing between the dots is Δx, Δx=P/N, x _i =i*(Δx), i=0,1,2,...,N, ie x _i indicates that the i-th dot is apart from The dot distance of the reference light source, N is the dot number of the reference source and the adjacent light source, and i is the sequential number of the dot numbers of the dots. The linear functions are D ₁₁ (x _i ) and D ₁₂ (x _i ), which are respectively expressed by the following equations:

D₁₁ (x_i )=a₁ +b₁ *x_i ，其中0≦x_i ≦(1/2)*P；以及D ₁₁ (x _i )=a ₁ +b ₁ *x _i , where 0≦x _i ≦(1/2)*P;

D₁₂ (x_i )=a₂ +b₂ *x_i ，其中(1/2)*P≦x_i ≦P。D ₁₂ (x _i )=a ₂ +b ₂ *x _i , where (1/2)*P≦x _i ≦P.

其中b₁ <0，b₂ =(|b₁ |+Δb)>0，a₁ 表示D₁₁ (x_i )在x_i =0的網點尺寸，b₁ 表示D₁₁ (x_i )的斜率值，a₂ 表示D₁₂ (x_i )在x_i =0的截距值，b₂ 表示D₁₂ (x_i )的斜率值，Δb表示相較於|b₁ |的b₂ 之斜率值變動量。Where b ₁ <0, b ₂ =(|b ₁ |+Δb)>0, a ₁ represents the dot size of D ₁₁ (x _i ) at x _i =0, and b ₁ represents the slope value of D ₁₁ (x _i ) , a ₂ represents the intercept value of D ₁₂ (x _i ) at x _i =0, b ₂ represents the slope value of D ₁₂ (x _i ), and Δb represents the variation of the slope value of b ₂ compared to |b ₁ | .

D₁₁ (x_i )的斜率值b₁ 之絕對值與D₁₂ (x_i )的斜率值b₂ 可以不相等或相等。D₁₁ (x_i )的斜率值b₁ 的範圍可介於-0.02與-0.12之間；D₁₂ (x_i )的斜率值b₂ 的範圍則可介於0.02與0.12之間。The slope D ₁₁ (x _i) of the sum of the absolute values of b ₁ and D ₁₂ (x _i) slope value b ₂ equal or may not be equal. The slope value b ₁ of D ₁₁ (x _i ) may range between -0.02 and -0.12; the slope value b ₂ of D ₁₂ (x _i ) may range between 0.02 and 0.12.

在一較佳實施例中，上述方程式以表(一)的數據資料來表示，其中該光源間距(P)為21.3mm，該混光高度(H)為12.5mm，每兩個光源之間的網點序數N取為22，則網點之間的網點間距Δx約為0.96mm；a₁ 表示D₁₁ (x_i )在x_i =0的網點初始尺寸，大約等於0.60mm，a₂ 表示D₁₂ (x_i )在x_i =0的截距值，大約等於-0.032mm(未列於表(一))；D₁₁ (x_i )的斜率值b₁ 之絕對值與D₁₂ (x_i )的斜率值b₂ 相等，其絕對值等於0.0295，亦即相較於|b₁ |的b₂ 之斜率值變動量Δb等於0。當D₁₁ (x_i )的斜率值b₁ 之絕對值與D₁₂ (x_i )的斜率值b₂ 不相等時，Δb不等於0。其中，順序編號為11的網點即為第12個網點，係為D₁₁ (x_i )與D₁₂ (x_i )的交界點。In a preferred embodiment, the above equation is represented by the data of Table (1), wherein the light source spacing (P) is 21.3 mm, and the mixed light height (H) is 12.5 mm between each two light sources. The dot sequence number N is taken as 22, and the dot spacing Δx between the dots is about 0.96 mm; a ₁ represents the initial size of the dot of D ₁₁ (x _i ) at x _i =0, which is approximately equal to 0.60 mm, and a ₂ represents D ₁₂ ( x _i ) the intercept value at x _i =0, approximately equal to -0.032 mm (not listed in Table (1)); the absolute value of the slope value b ₁ of D ₁₁ (x _i ) and D ₁₂ (x _i ) The slope value b _{2 is} equal, and its absolute value is equal to 0.0295, that is, the slope value variation Δb of b ₂ compared to |b ₁ | is equal to zero. When the slope D ₁₁ (x _i) of the sum of the absolute values of b ₁ and D ₁₂ (x _i) of the slope value is not equal to b _2, Δb is not equal to 0. The dot numbered 11 is the 12th dot, which is the boundary point between D ₁₁ (x _i ) and D ₁₂ (x _i ).

根據上述，該網點圖案利用兩組線性函數來分佈複數個網點，使該些網點的尺寸隨著這兩個線性函數作調整，以擴散來自光源的光線，達到亮度均勻化的效果，適用於該光源間距(P)與該混光高度(H)具有較低比值的背光模組。According to the above, the dot pattern uses two sets of linear functions to distribute a plurality of dots, so that the sizes of the dots are adjusted according to the two linear functions to diffuse light from the light source to achieve brightness uniformity, which is suitable for the A backlight module having a lower ratio of the light source pitch (P) to the light mixing height (H).

在第5B圖之實施例中，該光源間距(P)與該混光高度(H)的比值係介於1.7與2.5之間。該些網點之間的網點間距為Δx，Δx=P/N，x_i =i*(Δx)，i=0,1,2,...,N，即x_i 表示第i個網點相距於基準光源的網點距離，N為基準光源與相鄰光源之間的網點序數，i為該些網點序數的順序編號。該些線性函數為D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )，係分別以下列方程式表示：In the embodiment of Figure 5B, the ratio of the source spacing (P) to the mixing height (H) is between 1.7 and 2.5. The dot spacing between the dots is Δx, Δx=P/N, x _i =i*(Δx), i=0,1,2,...,N, ie x _i indicates that the i-th dot is apart from The dot distance of the reference light source, N is the dot number of the reference source and the adjacent light source, and i is the sequential number of the dot numbers of the dots. The linear functions are D ₂₁ (x _i ), D ₂₂ (x _i ), D ₂₃ (x _i ) and D ₂₄ (x _i ), which are respectively expressed by the following equations:

D₂₁ (x_i )=c₁ ，x_i =n₁ *P，0≦n₁ <n₂ ；D ₂₁ (x _i )=c ₁ , x _i =n ₁ *P,0≦n ₁ <n ₂ ;

D₂₂ (x_i )=c₂ +d₂ *x_i ，x_i =n₂ *P，n₁ <n₂ ≦(1/2)；D ₂₂ (x _i )=c ₂ +d ₂ *x _i , x _i =n ₂ *P,n ₁ <n ₂ ≦(1/2);

D₂₃ (x_i )=c₃ +d₃ *x_i ，x_i =n₃ *P，(1/2)<n₃ ≦n₄ ；以及D ₂₃ (x _i )=c ₃ +d ₃ *x _i , x _i =n ₃ *P,(1/2)<n ₃ ≦n ₄ ;

D₂₄ (x_i )=c₄ ，x_i =n₄ *P，n₃ ≦n₄ ≦1。D ₂₄ (x _i )=c ₄ , x _i =n ₄ *P, n ₃ ≦n ₄ ≦1.

其中d₂ <0，d₃ >0，d₂ 表示D₂₂ (x_i )的斜率值，d₃ 表示D₂₃ (x_i )的斜率值，n₁ ,n₂ ,n₃ ,n₄ 係表示x_i 分別在該些線性函數D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )的係數，c₁ ,c₂ ,c₃ ,c₄ 係表示x_i 分別在該些線性函數的網點初始尺寸值或是截距值。Where d ₂ <0, d ₃ >0, d ₂ represents the slope value of D ₂₂ (x _i ), d ₃ represents the slope value of D ₂₃ (x _i ), and n ₁ , n ₂ , n ₃ , n ₄ represent x _{i is a} coefficient of the linear functions D ₂₁ (x _i ), D ₂₂ (x _i ), D ₂₃ (x _i ) and D ₂₄ (x _i ), respectively, c ₁ , c ₂ , c ₃ , c ₄ Represents the initial size value or intercept value of the dot at x _i of the linear function.

D₂₂ (x_i )的斜率值d₂ 之絕對值與D₂₃ (x_i )的斜率值d₃ 可不相等或相等。D₂₂ (x_i )的斜率值d₂ 的範圍可介於-0.03與-0.14之間。D₂₃ (x_i )的斜率值d₃ 的範圍可介於0.03與0.14之間。D ₂₂ (x _i) of the absolute value of the slope and the value of d ₂ D ₂₃ (x _i) slope value d ₃ equal or not equal. The slope value d ₂ of D ₂₂ (x _i ) may range between -0.03 and -0.14. The slope value d ₃ of D ₂₃ (x _i ) may range between 0.03 and 0.14.

在一較佳實施例中，上述方程式以表(二)的數據資料來表示，其中該光源間距(P)為21.3mm，該混光高度(H)為9.2mm，每兩個光源之間的網點序數N為22，網點之間的網點間距Δx等於0.96mm；c₁ 表示D₂₁ (x_i )在x_i =0的網點初始尺寸，大約等於0.55mm，c₂ 表示D₂₂ (x_i )在x_i =0的截距值，大約等於0.64747mm；c₃ 表示D₂₃ (x_i )在x_i =0的截距值，大約等於-0.0762mm；c₄ 表示D₂₄ (x_i )在x_i =18.42mm的網點初始尺寸，大約等於0.550mm；D₂₂ (x_i )的斜率值d₂ 之絕對值與D₂₃ (x_i )的斜率值d₃ 相等，其絕對值等於0.03398。D₂₂ (x_i )的斜率值d₂ 之絕對值亦可與D₂₃ (x_i )的斜率值d₃ 不相等。其中，順序編號為3的網點即是第4個網點，係為D₂₁ (x_i )與D₂₂ (x_i )的交界點；順序編號為11的網點即是第12個網點，係為D₂₂ (x_i )與D₂₃ (x_i )的交界點；順序編號為19的網點即是第20個網點，係為D₂₃ (x_i )與D₂₄ (x_i )的交界點。In a preferred embodiment, the above equation is represented by the data of Table (2), wherein the light source spacing (P) is 21.3 mm, and the mixed light height (H) is 9.2 mm between each two light sources. The dot number N is 22, the dot spacing Δx between the dots is equal to 0.96 mm; c ₁ represents the initial size of the dot of D ₂₁ (x _i ) at x _i =0, which is approximately equal to 0.55 mm, and c ₂ represents D ₂₂ (x _i ) The intercept value at x _i =0 is approximately equal to 0.64747 mm; c ₃ represents the intercept value of D ₂₃ (x _i ) at x _i =0, approximately equal to -0.0762 mm; c ₄ represents D ₂₄ (x _i ) at x _i = the initial dot size is 18.42mm, approximately equal to 0.550mm; d ₂₂ (x _i) of the absolute value of the slope of the slope value d d ₂₃ (x _i) of the value d ₂ _{equal. 3,} the absolute value is equal to 0.03398. The absolute value of the slope value d ₂ of D ₂₂ (x _i ) may also be unequal to the slope value d _{3 of} D ₂₃ (x _i ). Among them, the dot with sequence number 3 is the fourth dot, which is the boundary point between D ₂₁ (x _i ) and D ₂₂ (x _i ); the dot with sequence number 11 is the 12th dot, which is D The boundary point between ₂₂ (x _i ) and D ₂₃ (x _i ); the dot numbered 19 is the 20th dot, which is the boundary point between D ₂₃ (x _i ) and D ₂₄ (x _i ).

根據上述，該網點圖案利用四組線性函數來分佈複數個網點，使該些網點的尺寸隨著這四個線性函數作調整，以擴散來自光源的光線，達到亮度均勻化的效果，適用於該光源間距(P)與該混光高度(H)具有較高比值的背光模組。應注意的是，本發明並不限制這些線性函數的使用數量，其亦可為三個或四個以上的線性函數組合。According to the above, the dot pattern uses four sets of linear functions to distribute a plurality of dots, so that the sizes of the dots are adjusted according to the four linear functions to diffuse light from the light source to achieve brightness uniformity, which is suitable for the A backlight module having a higher ratio of the light source pitch (P) to the light mixing height (H). It should be noted that the present invention does not limit the number of uses of these linear functions, and it may also be a combination of three or more linear functions.

請繼續參考第5A圖以及表(一)，在另一較佳實施例中，本發明揭露一種具有網點圖案的擴散板結構，該網點圖案具有複數個網點，該些網點係沿著該些光源的兩排列方向設置。以光源為冷陰極燈管或外部電極燈管為例，係指該些燈管的排列方向與軸心方向或延伸方向設置，以光源為發光二極體為例，則係指該些發光二極體的矩陣排列方向。該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為至少一排列方向上的分佈距離之函數。該些網點之間的網點間距為Δx，x_i =i*(Δx)，i=0,1,2,...,N，即x_i 表示第i個網點相距於基準光源的網點距離，N為沿著該排列方向的網點序數，i為該些網點序數的順序編號。Please refer to FIG. 5A and Table (1). In another preferred embodiment, the present invention discloses a diffuser structure having a dot pattern having a plurality of dots along the light source. The two alignment directions are set. Taking a light source as a cold cathode lamp or an external electrode lamp as an example, the arrangement direction of the lamps and the direction of the axis or the direction of extension are set. Taking the light source as a light-emitting diode as an example, the light-emitting diodes are referred to as The matrix of the polar body is arranged in the direction. The sizes of the dots are distributed according to a plurality of linear functions, and the linear functions are a function of the distribution distance in at least one of the alignment directions. The dot spacing between the dots is Δx, x _i = i * (Δx), i = 0, 1, 2, ..., N, that is, x _i represents the dot distance of the i-th dot from the reference light source. N is the dot sequence number along the arrangement direction, and i is the sequential number of the dot sequence numbers.

該些線性函數為D₁₁ (x_i )與D₁₂ (x_i )，係分別以下列方程式表示：The linear functions are D ₁₁ (x _i ) and D ₁₂ (x _i ), which are respectively expressed by the following equations:

D₁₁ (x_i )=a₁ +b₁ *x_i ，其中0≦x_i ≦(1/2)*(N*Δx)；以及D ₁₁ (x _i )=a ₁ +b ₁ *x _i , where 0≦x _i ≦(1/2)*(N*Δx);

D₁₂ (x_i )=a₂ +b₂ *x_i ，其中(1/2)≦x_i ≦(1/2)*(N*Δx)。D ₁₂ (x _i )=a ₂ +b ₂ *x _i , where (1/2)≦x _i ≦(1/2)*(N*Δx).

其中，b₁ <0，b₂ =(|b₁ |+Δb)>0，a₁ 表示D₁₁ (x_i )在x_i =0的網點尺寸，b₁ 表示D₁₁ (x_i )的斜率值，a₂ 表示D₁₂ (x_i )在x_i =0的網點尺寸，b₂ 表示D₁₂ (x_i )的斜率值，Δb表示相較於|b₁ |的b₂ 之斜率值變動量。D₁₁ (x_i )的斜率值b₁ 的範圍可介於-0.02與-0.12之間。D₁₂ (x_i )的斜率值b₂ 的範圍可介於0.02與0.12之間。Where b ₁ <0, b ₂ = (|b ₁ | + Δb) > 0, a ₁ represents the dot size of D ₁₁ (x _i ) at x _i =0, and b ₁ represents the slope of D ₁₁ (x _i ) Value, a ₂ represents the dot size of D ₁₂ (x _i ) at x _i =0, b ₂ represents the slope value of D ₁₂ (x _i ), and Δb represents the slope value variation of b ₂ compared to |b ₁ | . The slope value b ₁ of D ₁₁ (x _i ) may range between -0.02 and -0.12. The slope value b ₂ of D ₁₂ (x _i ) may range between 0.02 and 0.12.

另外，請繼續參考第5B圖以及表(二)，當本發明之具有網點圖案的擴散板結構使用四個線性函數時，該些線性函數為D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )，係分別以下列方程式表示：In addition, please refer to FIG. 5B and Table (2). When the diffusion plate structure with the dot pattern of the present invention uses four linear functions, the linear functions are D ₂₁ (x _i ), D ₂₂ (x _i ) D ₂₃ (x _i ) and D ₂₄ (x _i ) are expressed by the following equations:

D₂₁ (x_i )=c₁ ，xi=n₁ *(N*Δx)，0≦n₁ <n₂ ；D ₂₁ (x _i )=c ₁ , xi=n ₁ *(N*Δx), 0≦n ₁ <n ₂ ;

D₂₂ (xi)=c₂ +d₂ *x_i ，xi=n₂ *(N*Δx)，n₁ <n₂ ≦(1/2)；D ₂₂ (xi)=c ₂ +d ₂ *x _i , xi=n ₂ *(N*Δx), n ₁ <n ₂ ≦(1/2);

D₂₃ (x_i )=c₃ +d₃ *x_i ，xi=n₃ *(N*Δx)，(1/2)<n₃ ≦n4；以及D ₂₃ (x _i )=c ₃ +d ₃ *x _i , xi=n ₃ *(N*Δx), (1/2)<n ₃ ≦n4;

D₂₄ (x_i )=c₄ ，x_i =n₄ *(N*Δx)，n₃ ≦n₄ ≦1。D ₂₄ (x _i )=c ₄ , x _i =n ₄ *(N*Δx), n ₃ ≦n ₄ ≦1.

其中d₂ <0，d₃ >0，d₂ 表示D₂₂ (x_i )的斜率值，d₃ 表示D₂₃ (x_i )的斜率值，其中n₁ ,n₂ ,n₃ ,n₄ 係表示x_i 分別在該些線性函數D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )的係數，c₁ ,c₄ 係表示x_i 分別在該些線性函數的網點初始尺寸值，c₂ ,c₃ 係表示x_i 分別在該些線性函數的截距值。D₂₂ (x_i )的斜率值d₂ 的範圍可介於-0.03與-0.14之間。D₂₃ (x_i )的斜率值d₃ 的範圍可介於0.03與0.14之間。Where d ₂ <0, d ₃ >0, d ₂ represents the slope value of D ₂₂ (x _i ), and d ₃ represents the slope value of D ₂₃ (x _i ), where n ₁ , n ₂ , n ₃ , n ₄ are Representing the coefficients of x _i in the linear functions D ₂₁ (x _i ), D ₂₂ (x _i ), D ₂₃ (x _i ) and D ₂₄ (x _i ), respectively, c ₁ , c ₄ are expressed as x _i respectively The mesh initial size values of the linear functions, c ₂ , c ₃ represent the intercept values of x _i in the linear functions, respectively. The slope value d ₂ of D ₂₂ (x _i ) may range between -0.03 and -0.14. The slope value d ₃ of D ₂₃ (x _i ) may range between 0.03 and 0.14.

參考第5A圖以及第6圖，第6圖為本發明一實施例中，擴散板的亮度百分比與網點距離之波形示意圖。其中，橫軸表示網點圖案中之各網點相距於基準光源的距離，即網點距離(mm)，0mm表示該基準光源的位置，-21.3mm表示位於基準光源一側的相鄰光源的位置，21.3mm、42.6mm分別表示位於基準光源另一側的其它光源的位置；縱軸表示光源在擴散板的對應位置處，所形成的亮度百分比(%)，其會隨著網點距離的不同，而有亮度百分比的起伏變化。其中，亮度百分比100%表示平均亮度值，若以此平均亮度值作為比較基準，則較此平均值亮度高者即會超過100%，反之則會低於100%。Referring to FIG. 5A and FIG. 6, FIG. 6 is a schematic diagram showing the waveform of the brightness percentage and the dot distance of the diffusion plate according to an embodiment of the present invention. Wherein, the horizontal axis represents the distance of each dot in the dot pattern from the reference light source, that is, the dot distance (mm), 0 mm represents the position of the reference light source, and -21.3 mm represents the position of the adjacent light source on the side of the reference light source, 21.3 Mm, 42.6mm respectively indicate the position of other light sources located on the other side of the reference light source; the vertical axis represents the percentage (%) of brightness formed by the light source at the corresponding position of the diffusing plate, which will vary with the distance of the dots. Fluctuations in the percentage of brightness. Among them, the brightness percentage of 100% represents the average brightness value. If the average brightness value is used as the comparison standard, the brightness higher than the average value will exceed 100%, and vice versa.

依據第5A圖之方程式，其適用於該光源間距(P)與該混光距離(H)具有較低比值的背光模組，例如當該光源間距(P)與該混光距離(H)的比值介於0至1.7時。但當該光源間距(P)與該混光距離(H)的比值介於1.7至2.5或是更高比值時，以C3曲線表示擴散板設置有網點圖案時的亮度百分比之波形，其中網點的分佈函數係為複數個線性函數。由於複數線性函數網點的作用，在-21.3mm、0mm(A3區域)、21.3mm(A4區域)與42.6mm(A5區域)的光源位置附近，C3曲線整體的亮度百分比的變化約為5%左右，特別是在0mm至42.6mm之間的位置，C3曲線整體的亮度百分比的變化也僅約為4%左右，其效果亦不差。相較於習知第2圖的C2曲線，C3曲線在0mm(A3區域)、21.3mm(A4區域)與42.6mm(A5區域)等光源位置的亮度百分比之變化較為緩和，所以在這些光源位置附近不太會形成暗帶條紋(mura)，能有效解決暗帶條紋(mura)的問題。According to the equation of FIG. 5A, it is applicable to a backlight module having a lower ratio of the light source spacing (P) to the light mixing distance (H), for example, when the light source spacing (P) and the mixing distance (H) The ratio is between 0 and 1.7. However, when the ratio of the distance between the light source (P) and the light mixing distance (H) is between 1.7 and 2.5 or higher, the waveform of the percentage of brightness when the diffuser is provided with the dot pattern is represented by a C3 curve, wherein the dot is The distribution function is a complex number of linear functions. Due to the function of the complex linear function dot, the change in the brightness percentage of the C3 curve as a whole is about 5% in the vicinity of the light source positions of -21.3 mm, 0 mm (A3 region), 21.3 mm (A4 region), and 42.6 mm (A5 region). Especially in the position between 0mm and 42.6mm, the change in the percentage of brightness of the entire C3 curve is only about 4%, and the effect is not bad. Compared with the C2 curve of the conventional Fig. 2, the change in the luminance percentage of the C3 curve at the position of the light source such as 0 mm (A3 region), 21.3 mm (A4 region), and 42.6 mm (A5 region) is moderate, so at these light source positions The mura is less likely to form in the vicinity, which can effectively solve the problem of mura.

參考第5B圖以及第6圖，依據第5B圖之方程式，且該光源間距(P)與該混光距離(H)具有較高比值的背光模組，例如當該光源間距(P)與該混光距離(H)的比值介於1.7至2.5或是更高比值時，以C4曲線表示擴散板設置有網點圖案時的亮度百分比之波形，其中網點的分佈函數係為複數個線性函數。由於線性函數網點的作用，在-21.3mm、0mm(A3區域)、21.3mm(A4區域)與42.6mm(A5區域)的光源位置附近，C4曲線整體的亮度百分比的變化僅約為3%左右，特別是在0mm至42.6mm之間的位置，C4曲線整體的亮度百分比的變化更僅約為2%左右。相較於習知第2圖的C2曲線，C4曲線在0mm(A3區域)、21.3mm(A4區域)與42.6mm(A5區域)等光源位置的亮度百分比之變化更加緩和，所以在這些光源位置附近能有效消除光源形成的暗帶條紋(mura)，且能夠改善具備薄型化或是節能型的背光模組之亮度分布不均勻的問題。Referring to FIG. 5B and FIG. 6 , according to the equation of FIG. 5B , and the backlight module having a higher ratio of the light source spacing (P) and the light mixing distance (H), for example, when the light source spacing (P) When the ratio of the light mixing distance (H) is between 1.7 and 2.5 or higher, the waveform of the percentage of brightness when the diffusion plate is provided with the dot pattern is represented by a C4 curve, wherein the distribution function of the dots is a plurality of linear functions. Due to the function of the linear function dot, the change in the brightness percentage of the entire C4 curve is only about 3% in the vicinity of the light source positions of -21.3mm, 0mm (A3 area), 21.3mm (A4 area) and 42.6mm (A5 area). Especially at a position between 0 mm and 42.6 mm, the change in the percentage of brightness of the entire C4 curve is only about 2%. Compared with the C2 curve of the conventional figure 2, the change of the brightness percentage of the C4 curve at the position of the light source such as 0 mm (A3 area), 21.3 mm (A4 area) and 42.6 mm (A5 area) is more moderate, so at these light source positions The mura can be effectively eliminated in the vicinity, and the problem of uneven brightness distribution of the backlight module having a thin or energy-saving type can be improved.

由於本發明之具有網點圖案的背光模組及其擴散板結構係使用複數個線性函數，故網點尺寸隨著該網點距離的分佈相當簡單，因此有利於大量、快速的生產製造。而且可針對一般背光模組或是薄型化的背光模組，同時選擇不同的線性網點尺寸分佈函數，例如選用光源間距(P)與該混光距離(H)不同比值，有效簡化背光模組設計的複雜度與量產的容易度。Since the backlight module with the dot pattern and the diffusing plate structure thereof of the present invention use a plurality of linear functions, the dot size distribution is relatively simple with the distance of the dot, which is advantageous for mass production and rapid manufacturing. Moreover, for a general backlight module or a thinned backlight module, different linear dot size distribution functions can be selected at the same time, for example, a different ratio of the light source spacing (P) to the light mixing distance (H) is selected, thereby simplifying the backlight module design. The complexity and ease of mass production.

根據上述，本發明之具有網點圖案的背光模組及其擴散板結構，將背光模組的微結構擴散板(micro structure diffuser plate)或是平板擴散板(planar diffuser plate)，不論是在薄型化(slim)或是具有少量光源的省能源(economic power consumption)型的背光模組，透過複數線性函數分佈來調整網點圖案(dot patterns)的尺寸，將來自光源的光源有效地擴散分光，可解決暗帶條紋的問題，以達到背光模組光均勻化的目的。According to the above, the backlight module having the dot pattern and the diffusing plate structure thereof, the micro structure diffuser plate or the planar diffuser plate of the backlight module, whether thinned or thinned (slim) or an economic power consumption type backlight module having a small number of light sources, the size of dot patterns is adjusted through a complex linear function distribution, and the light source from the light source is effectively diffused and split, which can be solved. The problem of dark stripe stripes is to achieve the purpose of light homogenization of the backlight module.

雖然本發明已用較佳實施例揭露如上，然其並非用以限定本發明，本發明所屬技術領域中具有通常知識者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，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。While the invention has been described above in terms of the preferred embodiments, the invention is not intended to limit the invention, and the invention may be practiced without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

300．．．背光模組300. . . Backlight module

301．．．背板301. . . Backplane

302．．．反射片302. . . A reflective sheet

304．．．光源304. . . light source

306．．．擴散板306. . . Diffuser

308．．．網點圖案308. . . Dot pattern

310．．．微結構圖案310. . . Microstructure pattern

第1圖為習知技術中，擴散板的網點尺寸分佈函數圖。Fig. 1 is a diagram showing a dot size distribution function of a diffusion plate in the prior art.

第2圖為習知技術中，擴散板的亮度百分比與網點距離之波形示意圖。FIG. 2 is a schematic diagram showing the waveform of the percentage of brightness of the diffusion plate and the distance between the dots in the prior art.

第3圖為本發明背光模組的剖面示意圖。3 is a schematic cross-sectional view of a backlight module of the present invention.

第4圖為本發明一實施例中，擴散板的網點排列示意圖。Fig. 4 is a schematic view showing the arrangement of dots of a diffusion plate according to an embodiment of the invention.

第5A圖與第5B圖為本發明擴散板的網點尺寸分佈函數圖。5A and 5B are diagrams showing the dot size distribution function of the diffusion plate of the present invention.

第6圖為本發明一實施例中，擴散板的亮度百分比與網點距離之波形示意圖。FIG. 6 is a schematic diagram showing the waveform of the brightness percentage and the dot distance of the diffusion plate according to an embodiment of the invention.

Claims

一種具有網點圖案的背光模組，包括：一反射片；複數個光源，彼此相距一光源間距(P)而排列於該反射片上；以及一擴散板，配置於該些光源上，且與該反射片相距一混光高度(H)；其中，該擴散板包含該網點圖案，該網點圖案具有複數個網點，該些網點係沿著該些光源的兩排列方向設置，該些網點之間的網點間距為Δx，Δx=P/N，x_i =i*(Δx)，i=0,1,2,...,N，N為每兩個光源之間的網點序數，i為該些網點序數的順序編號，該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為該光源間距(P)之函數，該些線性函數包含D₁₁ (x_i )與D₁₂ (x_i )，係分別以下列方程式表示：D₁₁ (x_i )=a₁ +b₁ *x_i ，其中0≦x_i ≦(1/2)*P；以及D₁₂ (x_i )=a₂ +b₂ *x_i ，其中(1/2)*P≦x_i ≦P；其中b₁ <0，b₂ =(|b₁ |+Δb)>0，a₁ 表示D₁₁ (x_i )在x_i =0的網點尺寸，b₁ 表示D₁₁ (x_i )的斜率值，a₂ 表示D₁₂ (x_i )在x_i =0的網點尺寸，b₂ 表示D₁₂ (x_i )的斜率值，Δb表示相較於|b₁ |的b₂ 之斜率值變動量。A backlight module having a dot pattern, comprising: a reflective sheet; a plurality of light sources arranged on the reflective sheet at a distance from each other (P); and a diffusing plate disposed on the light source and reflected The sheet is separated by a mixed light height (H); wherein the diffusing plate comprises the dot pattern, the dot pattern has a plurality of dots, the dots are disposed along two alignment directions of the light sources, and the dots between the dots The spacing is Δx, Δx=P/N, x _i =i*(Δx), i=0,1,2,...,N,N is the dot sequence number between each two light sources, i is the mesh points The sequential number of the ordinal numbers, the sizes of the mesh points are distributed according to a plurality of linear functions, and the linear functions are functions of the light source spacing (P), and the linear functions include D ₁₁ (x _i ) and D ₁₂ (x _i ), respectively expressed by the following equation: D ₁₁ (x _i )=a ₁ +b ₁ *x _i , where 0≦x _i ≦(1/2)*P; and D ₁₂ (x _i )=a ₂ +b ₂ *x _i , where (1/2)*P≦x _i ≦P; where b ₁ <0, b ₂ =(|b ₁ |+Δb)>0, a ₁ represents D ₁₁ (x _i ) At a dot size of x _i =0, b ₁ represents the slope value of D ₁₁ (x _i ), and a ₂ represents D ₁₂ (x _i ) at a dot size of x _i =0, b ₂ represents a slope value of D ₁₂ (x _i ), and Δb represents a slope value variation of b ₂ compared to |b ₁ |.

如申請專利範圍第1項所述之背光模組，其中該些光源係為冷陰極燈管、外部電極燈管或發光二極體。 The backlight module of claim 1, wherein the light sources are cold cathode lamps, external electrode tubes or light emitting diodes.

如申請專利範圍第1項所述之背光模組，其中該些網點係設置於該擴散板的入光面，且面對於該些光源。 The backlight module of claim 1, wherein the dots are disposed on a light incident surface of the diffuser and face the light sources.

如申請專利範圍第1項所述之背光模組，另包括一微結構圖案，設置於該擴散板的出光面，且背對於該些光源。 The backlight module of claim 1, further comprising a microstructure pattern disposed on the light emitting surface of the diffusing plate and facing away from the light sources.

如申請專利範圍第1項所述之背光模組，其中該光源間距(P)與該混光高度(H)的比值係介於0與1.7之間。 The backlight module of claim 1, wherein the ratio of the light source spacing (P) to the light mixing height (H) is between 0 and 1.7.

如申請專利範圍第1項所述之背光模組，其中D₁₁ (x_i )的斜率值b₁ 之絕對值與D₁₂ (x_i )的斜率值b₂ 不相等。The backlight module of the application of paragraph 1 patentable scope, where the slope D ₁₁ (x _i) the value of the absolute value of the slope b is ₁ and D ₁₂ (x _i) is not equal to the value of b _2.

如申請專利範圍第1項所述之背光模組，其中D₁₁ (x_i )的斜率值b₁ 的範圍介於-0.02與-0.12之間。The backlight module of claim 1, wherein the slope value b ₁ of D ₁₁ (x _i ) ranges between -0.02 and -0.12.

如申請專利範圍第1項所述之背光模組，其中D₁₂ (x_i )的斜率值b₂ 的範圍介於0.02與0.12之間。The backlight module of claim 1, wherein the slope value b ₂ of D ₁₂ (x _i ) ranges between 0.02 and 0.12.

如申請專利範圍第1項所述之背光模組，其中該光源間距(P)與該混光高度(H)的比值係介於1.7與2.5之間。 The backlight module of claim 1, wherein the ratio of the light source spacing (P) to the light mixing height (H) is between 1.7 and 2.5.

一種具有網點圖案的背光模組，包括：一反射片；複數個光源，彼此相距一光源間距(P)而排列於該反射片上；以及一擴散板，配置於該些光源上，且與該反射片相距一混光高度(H)；其中，該擴散板包含該網點圖案，該網點圖案具有複數個網點，該些網點係沿著該些光源的兩排列方向設置，該些網點之間的網點間距為Δx，Δx=P/N，x_i =i*(Δx)，i=0,1,2,...,N，N為每兩個光源之間的網點序數，i為該些網點序數的順序編號，該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為該光源間距(P)之函數，其中該些線性函數為D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )，係分別以下列方程式表示：D₂₁ (x_i )=c₁ ，x_i =n₁ *P，0≦n₁ <n₂ ； D₂₂ (x_i )=c₂ +d₂ *x_i ，x_i =n₂ *P，n₁ <n₂ ≦(1/2)；D₂₃ (x_i )=c₃ +d₃ *x_i ，x_i =n₃ *P，(1/2)<n₃ ≦n₄ ；以及D₂₄ (x_i )=c₄ ，x_i =n₄ *P，n₃ ≦n₄ ≦1；其中d₂ <0，d₃ >0，d₂ 表示D₂₂ (x_i )的斜率值，d₃ 表示D₂₃ (x_i )的斜率值，n₁ ,n₂ ,n₃ ,n₄ 係表示x_i 分別在該些線性函數D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )的係數，c₁ ,c₄ 係表示x_i 分別在該些線性函數的網點初始尺寸值，c₂ ,c₃ 係表示x_i 分別在該些線性函數的截距值。A backlight module having a dot pattern, comprising: a reflective sheet; a plurality of light sources arranged on the reflective sheet at a distance from each other (P); and a diffusing plate disposed on the light source and reflected The sheet is separated by a mixed light height (H); wherein the diffusing plate comprises the dot pattern, the dot pattern has a plurality of dots, the dots are disposed along two alignment directions of the light sources, and the dots between the dots The spacing is Δx, Δx=P/N, x _i =i*(Δx), i=0,1,2,...,N,N is the dot sequence number between each two light sources, i is the mesh points The order numbers of the ordinals are distributed according to a plurality of linear functions, and the linear functions are functions of the distance (P) of the light sources, wherein the linear functions are D ₂₁ (x _i ), D ₂₂ ( x _i ), D ₂₃ (x _i ) and D ₂₄ (x _i ) are expressed by the following equations respectively: D ₂₁ (x _i )=c ₁ , x _i =n ₁ *P,0≦n ₁ <n ₂ D ₂₂ (x _i )=c ₂ +d ₂ *x _i ,x _i =n ₂ *P,n ₁ <n ₂ ≦(1/2);D ₂₃ (x _i )=c ₃ +d ₃ * x _i , x _i =n ₃ *P, (1/2)<n ₃ ≦n ₄ ; and D ₂₄ (x _i )=c ₄ , x _i =n ₄ *P,n ₃ ≦n ₄ ≦1; where d ₂ <0, d ₃ >0, d ₂ represents the slope value of D ₂₂ (x _i ), and d ₃ represents the slope value of D ₂₃ (x _i ), n ₁ , n ₂ , n ₃ , n ₄ represents the coefficients of x _i in the linear functions D ₂₁ (x _i ), D ₂₂ (x _i ), D ₂₃ (x _i ) and D ₂₄ (x _i ), respectively, c ₁ , c ₄ It is expressed as the initial size value of the dot of each linear function of x _i , and c ₂ , c ₃ are the intercept values of x _i respectively in the linear functions.

如申請專利範圍第10項所述之背光模組，其中D₂₂ (x_i )的斜率值d₂ 之絕對值與D₂₃ (x_i )的斜率值d₃ 不相等。The backlight module of the application of paragraph 10 patentable scope, where D ₂₂ (x _i) of the absolute value of the slope and the value of d ₂ D ₂₃ (x _i) slope value d ₃ are not equal.

如申請專利範圍第10項所述之背光模組，其中D₂₂ (x_i )的斜率值d₂ 的範圍介於-0.03與-0.14之間。The backlight module of claim 10, wherein the slope value d ₂ of D ₂₂ (x _i ) ranges between -0.03 and -0.14.

如申請專利範圍第10項所述之背光模組，其中D₂₃ (x_i )的斜率值d₃ 的範圍介於0.03與0.14之間。The backlight module of claim 10, wherein the slope value d ₃ of D ₂₃ (x _i ) ranges between 0.03 and 0.14.

一種具有網點圖案的擴散板結構，該網點圖案具有複數個網點，該些網點係沿著一排列方向設置，該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為該些網點沿著該排列方向的分佈距離之函數，其中該些網點之間的網點間距為Δx，x_i =i*(Δx)，i=0,1,2,...,N，N為沿著該排列方向的網點序數，i為該些網點序數的順序編號，其中該些線性函數為D₁₁ (x_i )與D₁₂ (x_i )，係分別以下列方程式表示：D₁₁ (x_i )=a₁ +b₁ *x_i ，其中0≦x_i ≦(1/2)*(N*Δx)；以及D₁₂ (x_i )=a₂ +b₂ *x_i ，其中(1/2)≦x_i ≦(1/2)*(N*Δx)；其中b₁ <0，b₂ =(|b₁ |+Δb)>0，a₁ 表示D₁₁ (x_i )在x_i =0的網點尺寸，b₁ 表示 D₁₁ (x_i )的斜率值，a₂ 表示D₁₂ (x_i )在x_i =0的網點尺寸，b₂ 表示D₁₂ (x_i )的斜率值，Δb表示相較於|b₁ |的b₂ 之斜率值變動量。A diffuser structure having a dot pattern having a plurality of dots arranged along an alignment direction, the sizes of the dots being distributed according to a plurality of linear functions, and the linear functions are The function of the distribution distance of the dots along the arrangement direction, wherein the dot spacing between the dots is Δx, x _i = i * (Δx), i = 0, 1, 2, ..., N, N is along The order of the dot in the arrangement direction, i is the sequential number of the ordinal numbers of the dots, wherein the linear functions are D ₁₁ (x _i ) and D ₁₂ (x _i ), respectively expressed by the following equation: D ₁₁ (x _i ) = a ₁ + b ₁ * x _i , where 0 ≦ x _i ≦ (1/2) * (N * Δx); and D ₁₂ (x _i ) = a ₂ + b ₂ * x _i , where (1/ 2) ≦x _i ≦(1/2)*(N*Δx); where b ₁ <0, b ₂ =(|b ₁ |+Δb)>0, a ₁ represents D ₁₁ (x _i ) at x _i The dot size of =0, b ₁ represents the slope value of D ₁₁ (x _i ), a ₂ represents the dot size of D ₁₂ (x _i ) at x _i =0, and b ₂ represents the slope value of D ₁₂ (x _i ), Δb represents the amount of change in the slope value of b ₂ compared to |b ₁ |.

如申請專利範圍第14項所述之擴散板結構，其中D₁₁ (x_i )的斜率值b₁ 的範圍介於-0.02與-0.12之間。The diffuser structure according to claim 14, wherein the slope value b ₁ of D ₁₁ (x _i ) ranges between -0.02 and -0.12.

如申請專利範圍第14項所述之擴散板結構，其中D₁₂ (x_i )的斜率值b₂ 的範圍介於0.02與0.12之間。The diffuser structure of claim 14, wherein the slope value b ₂ of D ₁₂ (x _i ) ranges between 0.02 and 0.12.

一種具有網點圖案的擴散板結構，該網點圖案具有複數個網點，該些網點係沿著一排列方向設置，該些網點的尺寸係依據複數個線性函數分佈，且該些線性函數係為該些網點沿著該排列方向的分佈距離之函數，其中該些網點之間的網點間距為Δx，x_i =i*(Δx)，i=0,1,2,...,N，N為沿著該排列方向的網點序數，i為該些網點序數的順序編號，其中該些線性函數為D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )，係分別以下列方程式表示：D₂₁ (x_i )=c₁ ，x_i =n₁ *(N*Δx)，0≦n₁ <n₂ ；D₂₂ (x_i )=c₂ +d₂ *x_i ，x_i =n₂ *(N*Δx)，n₁ <n₂ ≦(1/2)；D₂₃ (x_i )=c₃ +d₃ *x_i ，x_i =n₃ *(N*Δx)，(1/2)<n₃ ≦n₄ ；以及D₂₄ (x_i )=c₄ ，x_i =n₄ *(N*Δx)，n₃ ≦n₄ ≦1；其中d₂ <0，d₃ >0，d₂ 表示D₂₂ (x_i )的斜率值，d₃ 表示D₂₃ (x_i )的斜率值，其中n₁ ,n₂ ,n₃ ,n₄ 係表示x_i 分別在該些線性函數D₂₁ (x_i )、D₂₂ (x_i )、D₂₃ (x_i )與D₂₄ (x_i )的係數，c₁ ,c₄ 係表示x_i 分別在該些線性函數的網點初始尺寸值，c₂ ,c₃ 係表示x_i 分別在該些線性函數的截距值。A diffuser structure having a dot pattern having a plurality of dots arranged along an alignment direction, the sizes of the dots being distributed according to a plurality of linear functions, and the linear functions are The function of the distribution distance of the dots along the arrangement direction, wherein the dot spacing between the dots is Δx, x _i = i * (Δx), i = 0, 1, 2, ..., N, N is along The number of the dot points of the arrangement direction, i is the sequential number of the number of the dot points, wherein the linear functions are D ₂₁ (x _i ), D ₂₂ (x _i ), D ₂₃ (x _i ) and D ₂₄ (x _i ), respectively, expressed by the following equation: D ₂₁ (x _i )=c ₁ , x _i =n ₁ *(N*Δx),0≦n ₁ <n ₂ ;D ₂₂ (x _i )=c ₂ +d ₂ *x _i , x _i =n ₂ *(N*Δx), n ₁ <n ₂ ≦(1/2); D ₂₃ (x _i )=c ₃ +d ₃ *x _i ,x _i =n ₃ *(N*Δx), (1/2)<n ₃ ≦n ₄ ; and D ₂₄ (x _i )=c ₄ , x _i =n ₄ *(N*Δx), n ₃ ≦n ₄ ≦1; Where d ₂ <0, d ₃ >0, d ₂ represents the slope value of D ₂₂ (x _i ), and d ₃ represents the slope value of D ₂₃ (x _i ), where n ₁ , n ₂ , n ₃ , n ₄ are Representing x _i in the linear functions D ₂₁ (x _i ), D ₂₂ (x _i ), D The coefficients of ₂₃ (x _i ) and D ₂₄ (x _i ), c ₁ , c ₄ represent the initial size values of the mesh points of x _i in the linear functions, respectively, and c ₂ , c ₃ represent the linearities of x _{i in the} respective The intercept value of the function.

如申請專利範圍第17項所述之擴散板結構，其中D₂₂ (x_i )的斜率值d₂ 的範圍介於-0.03與-0.14之間。The diffuser structure according to claim 17, wherein the slope value d ₂ of D ₂₂ (x _i ) ranges between -0.03 and -0.14.

如申請專利範圍第17項所述之擴散板結構，其中D₂₃ (x_i )的斜率值d₃ 的範圍介於0.03與0.14之間。The diffuser structure according to claim 17, wherein the slope value d ₃ of D ₂₃ (x _i ) ranges between 0.03 and 0.14.