backlight module of the display

Abstract

A backlight module for a display includes a carrier substrate, light-emitting diode (LED) chips, and a first diffuser plate. The LED chips are arranged on the carrier substrate. The first diffuser plate is located on the carrier substrate and the LED chips. The first diffuser plate includes a first substrate, a first prismatic structure, and a plurality of first ink structures. The first substrate has an upper surface remote from the carrier substrate. The first prismatic structure is located on the upper surface of the first substrate, wherein the first prismatic structure includes a first prismatic substructure and a second prismatic substructure, the first prismatic substructure, the second prismatic substructure, and the upper surface of the first substrate together define a gap. The first ink structures are located in the gap and contact the upper surface of the first substrate. The first ink structures on the first diffuser plate can achieve better light mixing to improve image uniformity.

Description

Technical Field

[0001] Some embodiments disclosed herein include a backlight module for a display, particularly a backlight module for a display in which an ink structure is printed at a specific location on a diffuser plate. Background Technology

[0002] As display resolutions continue to improve, research is increasingly focused on enhancing the uniformity of light emission from backlight modules. There are many methods to improve this uniformity. For example, increasing the number of light-emitting diodes (LEDs) can increase optical coverage and address gaps caused by overlapping light energy. Alternatively, the diffuser plate can be improved to further diffuse the light emitted by the LEDs. Currently, the trend in backlight modules is to use sub-millimeter LEDs to increase light source density; however, mini LED packaging structures lack secondary optical lenses, thus requiring new light diffusion technologies to improve the uniformity of light emission from backlight modules. Summary of the Invention

[0003] Some embodiments disclosed herein provide a backlight module for a display, comprising a carrier substrate, a plurality of light-emitting diode (LED) chips, and a first diffuser plate. The plurality of LED chips are arranged on the carrier substrate. The first diffuser plate is located on the carrier substrate and the LED chips. The first diffuser plate includes a first substrate, a first prismatic structure, and a plurality of first ink structures. The first substrate has an upper surface remote from the carrier substrate. The first prismatic structure is located on the upper surface of the first substrate, wherein the first prismatic structure includes a first prismatic substructure and a second prismatic substructure, the first prismatic substructure, the second prismatic substructure, and the upper surface of the first substrate collectively defining a gap. The plurality of first ink structures are located in the gap and contact the upper surface of the first substrate.

[0004] In some embodiments, the first prism substructure of the first prism structure has a first apex protruding from the first substrate and a plurality of second apex contacting the upper surface of the first substrate, and the first ink structure is adjacent to at least one of the second apex of the first prism substructure.

[0005] In some embodiments, the first prismatic structure further includes a third prismatic substructure, with a V-shaped groove formed between the third prismatic substructure and the first prismatic substructure, and the third prismatic substructure is symmetrical to the first prismatic structure about the V-shaped groove.

[0006] In some implementations, the first ink structure is not in the V-shaped groove.

[0007] In some embodiments, the first prismatic structure has multiple inclined faces on the upper surface of the first substrate, and the first ink structure is not on the face.

[0008] In some embodiments, the backlight module further includes a second diffuser plate located on the first diffuser plate. The second diffuser plate includes a second substrate and a plurality of second ink structures located on a lower surface of the second substrate facing the first diffuser plate, wherein a first prism substructure and a second prism substructure of the first diffuser plate each have a first apex protruding from the first substrate, and the second ink structures are located directly above the first apex of the first prism substructure and the second prism substructure, respectively.

[0009] In some embodiments, the second diffuser plate further includes a second prismatic structure comprising a plurality of fourth prismatic substructures arranged on the upper surface of the second substrate, the upper surface of the second substrate being away from the first diffuser plate, wherein each of the fourth prismatic substructures includes a third apex projecting upward from the upper surface of the second substrate and a plurality of fourth apexes contacting the upper surface of the second substrate.

[0010] In some embodiments, the size of the first prismatic substructure of the first diffuser plate is larger than that of any of the fourth prismatic substructures of the second diffuser plate.

[0011] In some embodiments, the first diffuser plate further includes a support structure located on the upper surface of the first substrate and adjacent to the first prism structure, the height of the support structure being higher than that of the first prism structure.

[0012] In some embodiments, the first weight percentage of titanium dioxide in the first ink structure in the gap of the first diffuser plate is lower than the second weight percentage of titanium dioxide in the second ink structure on the lower surface of the second diffuser plate.

[0013] In some embodiments, the backlight module further includes a wavelength conversion film and an optical film. The wavelength conversion film is located on a first diffuser plate. The optical film is located on the wavelength conversion film.

[0014] In summary, the ink structure printed on the diffuser plate is positioned at specific locations to achieve better light mixing. Therefore, the uniformity of the display image can be improved. Furthermore, it can reduce the amount of LED chips used in the display's backlight module. Attached Figure Description

[0015] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings.

[0016] Figure 1 A side view of the backlight module of a display according to some embodiments disclosed herein is shown.

[0017] Figure 2 An exploded view of the backlight module carrier, light-emitting diode chip, reflector and first diffuser of a display according to some embodiments disclosed herein;

[0018] Figure 3 A perspective view of the first diffusion plate of some embodiments disclosed herein is shown;

[0019] Figure 4 A top view of the first diffusion plate of some embodiments disclosed herein is shown;

[0020] Figure 5 Draw the first prismatic structure along Figure 4 A cross-sectional view of line AA;

[0021] Figure 6 Then draw the first prismatic structure along Figure 4 A cross-sectional view of line BB;

[0022] Figure 7 A side view of a backlight module of a display according to one embodiment disclosed herein;

[0023] Figure 8 An exploded view of the backlight module of a display according to some embodiments disclosed herein, including the carrier board, light-emitting diode chip, reflector, first diffuser plate, and second diffuser plate.

[0024] Figure 9 A perspective view of the second diffusion plate illustrating some embodiments disclosed herein is shown;

[0025] Figure 10 A top view of the second diffusion plate of some embodiments disclosed herein is shown;

[0026] Figure 11 A bottom view of the second diffusion plate of some embodiments disclosed herein is shown;

[0027] Figure 12 Draw the second prismatic structure along Figure 10 A cross-sectional view of line CC;

[0028] Figure 13 Then draw the second prismatic structure along Figure 10 A cross-sectional view of line DD;

[0029] Figure 14A Draw the relative positions of the first diffuser plate and the second diffuser plate;

[0030] Figures 14B to 14D The diagram illustrates the multiple paths that light from a light-emitting diode chip takes through in the backlight module of a display.

[0031] Figure 15A The uniformity of the backlight module of a display using known technology is illustrated, and Figure 15B The uniformity of the backlight module of a display according to some embodiments of this disclosure is illustrated.

[0032]

Explanation of symbols

[0033] 100: Backlight Module

[0034] 110: Carrier board

[0035] 120: Light Emitting Diode Chip

[0036] 130: Reflector

[0037] 140: First diffuser plate

[0038] 142: First substrate

[0039] 142S: Upper surface

[0040] 144: First prismatic structure

[0041] 144A: First cusp

[0042] 144B: Second cusp

[0043] 144G: Gap

[0044] 144R: V-shaped groove

[0045] 144S: Face

[0046] 146: Prismatic substructure

[0047] 148: Prismatic substructure

[0048] 150: Prismatic substructure

[0049] 152: Prismatic substructure

[0050] 154: First Ink Structure

[0051] 156: Supporting Structure

[0052] 160: Wavelength conversion diaphragm

[0053] 170: Optical film

[0054] 180: Second diffuser plate

[0055] 182: Second substrate

[0056] 182R: Groove

[0057] 182S1: Lower surface

[0058] 182S2: Upper surface

[0059] 184: Second prismatic structure

[0060] 184A: Third cusp

[0061] 184B: Fourth cusp

[0062] 186: Prismatic substructure

[0063] 188: Prismatic substructure

[0064] 190: Prismatic substructure

[0065] 192: Prismatic substructure

[0066] 194: Second ink structure

[0067] 200: Backlight Module

[0068] 301: Curve

[0069] 302: Curve

[0070] 303: Curve

[0071] 304: Curve

[0072] AA: Line

[0073] BB: Line

[0074] CC: Line

[0075] DD: line

[0076] D1: Angle

[0077] D2: Angle

[0078] D3:Angle

[0079] D4:Angle

[0080] D5: Angle

[0081] D6: Angle

[0082] H1: Height

[0083] H2: Height

[0084] L1: Distance Detailed Implementation

[0085] The following describes several embodiments of this disclosure with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, those skilled in the art will understand that these practical details are not necessary in another embodiment of this disclosure and therefore should not be used to limit the scope of this disclosure. Furthermore, for the sake of simplicity, some known and conventional structures and elements will be illustrated in the drawings in a simple schematic manner.

[0086] Some embodiments of the display disclosed herein include a diffuser plate with an ink structure. In some embodiments of the display disclosed herein, the ink structure on the diffuser plate is printed at specific locations to achieve a better light mixing effect. Therefore, the screen uniformity of the display can be improved. In addition, the amount of light-emitting diode chips used in the display can also be reduced.

[0087] Figure 1 This illustration shows a side view of a backlight module 100 of a display according to some embodiments disclosed herein. The backlight module 100 is housed within a space formed by a display panel and a backplate or frame (not shown). The display backlight module 100 may include a carrier plate 110, a plurality of light-emitting diode (LED) chips 120, a reflector 130, a first diffuser 140, a wavelength conversion film 160, and an optical film 170. The LED chips 120 are arranged on the carrier plate 110. The first diffuser 140 is located on the carrier plate 110, the LED chips 120, and the reflector 130. The reflector 130 is located on the carrier plate 110 and the LED chips 120 and below the first diffuser 140. The wavelength conversion film 160 is located on the first diffuser 140. The optical film 170 is located on the wavelength conversion film 160. The backlight module 100 of the display serves as a light source for the display panel, providing the brightness required to display the image, enabling the display panel to display the image to the user.

[0088] Figure 2 An exploded view of a backlight module 100 of a display according to some embodiments disclosed herein, including a carrier board 110, light-emitting diode (LED) chips 120, a reflector 130, and a first diffuser 140. The carrier board 110 may be a circuit board. LED chips 120 are arranged on the carrier board 110. In some embodiments, the LED chips 120 are mini LEDs, micro LEDs, or other miniaturized LED chips. LED chips 120 can be arranged on the carrier board 110 in any suitable package type, such as chip-on-board (COB) or package-on-board (POB). LED chips 120 may be arranged in an array on the carrier board 110. In some embodiments, the LED chips 120 may emit blue light, which can pass through a wavelength conversion film 160 (see...). Figure 1The light is converted into white light. A reflector 130 is located on the light-emitting diode chip 120. In some embodiments, the reflector 130 has a bottom surface and sidewalls surrounding the bottom surface. The bottom surface has multiple openings corresponding to the positions of the light-emitting diode chip 120, allowing light from the light-emitting diode chip 120 to pass through the reflector 130. The sidewalls of the reflector 130 are used to reflect the light from the light-emitting diode chip 120 to ensure that all light is emitted upwards. In some embodiments, the reflector 130 is formed of polyethylene terephthalate (PET) and has a reflectivity higher than 99%.

[0089] The first diffuser plate 140 is located on the reflector plate 130 and can be used to diffuse the light emitted from the light-emitting diode chip 120 to improve image uniformity. For a detailed description of the structure of the first diffuser plate 140, please refer to [reference needed]. Figure 3 and Figure 4 . Figure 3 A perspective view of the first diffusion plate 140 in some embodiments disclosed herein is shown. Figure 4 The diagram illustrates a top view of a first diffusion plate 140 according to some embodiments disclosed herein. The first diffusion plate 140 includes a first substrate 142, a first prismatic structure 144, and a plurality of first ink structures 154. The first substrate 142 is a flat plate and has an upper surface 142S that is away from the carrier plate 110. That is, the upper surface 142S of the first substrate 142 does not face the carrier plate 110, but faces the opposite direction to the carrier plate 110.

[0090] A first prismatic structure 144 is located on the upper surface 142S of the first substrate 142. The first prismatic structure 144 includes a first prismatic substructure 146, a second prismatic substructure 148, a third prismatic substructure 150, and a fourth prismatic substructure 152. Each prismatic substructure of the first prismatic structure 144 (e.g., the first prismatic substructure 146, the second prismatic substructure 148, the third prismatic substructure 150, and the fourth prismatic substructure 152) has a plurality of inclined faces 144S on the upper surface 142S of the first substrate 142. Furthermore, the first prismatic substructure 146, the second prismatic substructure 148, the third prismatic substructure 150, and the fourth prismatic substructure 152 of the first prismatic structure 144 each have a first prismatic tip 144A protruding from the first substrate 142 and a plurality of second prismatic tips 144B contacting the upper surface 142S of the first substrate 142. Specifically, a plurality of faces 144S of one of the prism substructures of the first prism structure 144 define an upwardly projecting first apex 144A, and any two adjacent faces 144S define a second apex 144B on the upper surface 142S of the first substrate 142.

[0091] The first prismatic substructure 146, the second prismatic substructure 148, and the upper surface 142S of the first substrate 142 jointly define a gap 144G. A V-shaped groove 144R is formed between the third prismatic substructure 150 and the first prismatic substructure 146, and as shown... Figure 4 The third prismatic substructure 150 is symmetrical to the first prismatic substructure 146 about the V-shaped groove 144R. In other words, the face 144S of the first prismatic substructure 146 and the face 144S of the second prismatic substructure 148 do not have physical contact, but are connected to each other through the upper surface 142S of the first substrate 142. Therefore, there is a gap 144G between the first prismatic substructure 146 and the second prismatic substructure 148, and the bottom of the gap 144G is the upper surface 142S of the first substrate 142. In other words, the bottom of the gap 144G is a flat surface. In addition, the face 144S of the first prismatic substructure 146 and the face 144S of the third prismatic substructure 150 are in direct contact, so a V-shaped groove 144R is formed between the first prismatic substructure 146 and the third prismatic substructure 150, and the V-shaped groove 144R does not expose the upper surface 142S of the first substrate 142. In other words, the bottom of the V-shaped groove 144R is not a flat surface, but a sharp angle. Therefore, the distance between the first prismatic substructure 146 and the second prismatic substructure 148 is greater than the distance between the first prismatic substructure 146 and the third prismatic substructure 150. Furthermore, there is also a gap 144G between the third prismatic substructure 150 and the fourth prismatic substructure 152, and the fourth prismatic substructure 152 is symmetrical to the second prismatic substructure 148 about line BB. The distance between the third prismatic substructure 150 and the fourth prismatic substructure 152 is greater than the distance between the first prismatic substructure 146 and the third prismatic substructure 150.

[0092] In some embodiments, the first prismatic substructure 146, the second prismatic substructure 148, the third prismatic substructure 150, and the fourth prismatic substructure 152 can be combined to form a prismatic substructure unit, and this prismatic substructure unit can be arranged in a two-dimensional array (e.g., Figure 3 and Figure 4 As shown), to form a first prismatic structure 144. In addition, each prismatic substructure unit is spaced apart by a distance (e.g., a distance such as gap 144G).

[0093] In some embodiments, the first diffuser plate 140 is made of a light-transmitting material, and the first prismatic structure 144 can be formed by a precision roller through a rolling process. Therefore, light emitted from the underlying light-emitting diode chip 120 can penetrate the first diffuser plate 140 and be refracted out from the first prismatic structure 144. In some embodiments, a diffusing agent may be doped into the light-transmitting material of the first diffuser plate 140. Details regarding the path of light in the first diffuser plate 140 will be discussed later. Figures 14A to 14D As described in the text.

[0094] The first ink structure 154 is located in the gap 144G and contacts the upper surface 142S of the first substrate 142. The first ink structure 154 may be located at any suitable position in the gap 144G. In some embodiments, the first ink structure 154 is adjacent to at least one second tip 144B of the first prism substructure 146 (or the second prism substructure 148, the third prism substructure 150, or the fourth prism substructure 152), such as... Figure 4 As shown. When the first ink structure 154 is placed near the second tip 144B, it can effectively reflect the light from the light-emitting diode chip 120 (e.g., Figure 14B and Figure 14C (As shown).

[0095] In other embodiments, the first ink structure 154 may also be arranged along the edges of the first prism substructure 146, the second prism substructure 148, the third prism substructure 150, or the fourth prism substructure 152 on the upper surface 142S of the first substrate 142 to increase the anti-diffusivity. In other words, the first ink structure 154 is not located in the V-shaped groove 144R on the face 144S of the prism substructure of the first prism structure 144. Therefore, light emitted from the light-emitting diode chip 120 can penetrate the prism substructure of the first prism structure 144.

[0096] In some embodiments, a first ink structure 154 can be formed by printing ink onto the upper surface 142S of the first substrate 142. In some embodiments, the ink may contain titanium dioxide. Therefore, the first ink structure 154 also contains titanium dioxide. The first ink structure 154 may contain rutile, anatase, or a combination thereof titanium dioxide. The first ink structure 154 containing titanium dioxide has a high reflectivity for blue light. When blue light from the light-emitting diode chip 120 is refracted from the first diffuser 140 and enters the upper wavelength conversion film 160, a small portion of the light is reflected back to the first diffuser 140. The first ink structure 154, which readily reflects blue light, can reflect the blue light back to the wavelength conversion film 160, causing diffuse reflection of the blue light between the first diffuser 140 and the wavelength conversion film 160 to provide higher light mixing efficiency.

[0097] Furthermore, titanium dioxide has a high absorption rate for violet and ultraviolet light, so the absorption effect of violet and ultraviolet light can be adjusted by changing the weight percentage of titanium dioxide in the first ink structure 154 or the first diffuser plate 140. This can improve the purity of blue light and enhance the color performance of light after passing through the wavelength conversion film 160. Additionally, it can reduce the harmful effects of display light on the human eye. In some embodiments, the weight percentage of titanium dioxide in the first ink structure 154 on the first diffuser plate 140 is between 0.01% and 0.1%. If the weight percentage of titanium dioxide in the first ink structure 154 is outside the disclosed range, the amount of titanium dioxide in the first ink structure 154 may be insufficient to reflect light from the light-emitting diode chip 120, or the amount of titanium dioxide in the first ink structure 154 may be too high, resulting in insufficient light transmittance.

[0098] Figures 5 and 6 A cross-sectional view of the first prismatic structure 144 of some embodiments disclosed herein is shown. Figure 5 The first prismatic structure 144 is drawn along... Figure 4 The cross-sectional view of line AA. Figure 6 Then draw the first prismatic structure 144 along Figure 4 The cross-sectional view of line BB. Note that, for the sake of simplicity, Figure 5 and Figure 6 The first ink structure 154 is not shown. Figure 5 In this structure, the opposing edges of adjacent second prism substructure 148 and fourth prism substructure 152 have an angle D1, and the opposing edges of adjacent first prism substructure 146 and third prism substructure 150 have an angle D2. Figure 6 In the first diffuser plate 140, an angle D3 is formed between the overlapping edges of adjacent first prism substructure 146 and second prism substructure 148 in a side view. Angles D1, D2, and D3 can be between approximately 90 degrees and 130 degrees. When angles D1, D2, and D3 are within the disclosed range, the first diffuser plate 140 can have a better energy refraction and distribution effect. Furthermore, the first prism substructure 146, second prism substructure 148, third prism substructure 150, and fourth prism substructure 152 have a height H1, which can be between approximately 0.3 mm and approximately 0.5 mm.

[0099] Back Figure 1The wavelength conversion film 160 of the backlight module 100 of the display is located on the first diffuser plate 140. The wavelength conversion film 160 is filled with wavelength conversion materials such as quantum dots or phosphors to convert the light emitted by the light-emitting diode chip 120 into different wavelengths. For example, the wavelength conversion film 160 may contain red quantum dots that convert blue light into red light and green quantum dots that convert blue light into green light. When the light from the light-emitting diode chip 120 passes through the first diffuser plate 140 to the wavelength conversion film 160, the blue light can be mixed with the red and green light generated by wavelength conversion to form white light. An optical film 170 is located on the wavelength conversion film 160. In some embodiments, the optical film 170 may be a prism, a diffuser, a microlens, a dual brightness enhancement film (DBEF), or a composite film structure.

[0100] Figure 7 This illustration shows a side view of a backlight module 200 of a display according to one embodiment of the present invention. Figure 8 An exploded view of a portion of a backlight module 200 of a display according to some embodiments disclosed herein is shown. The difference between the backlight module 200 and the backlight module 100 is that the backlight module 200 also includes a second diffuser plate 180. The second diffuser plate 180 is located above the first diffuser plate 140 and below the wavelength conversion film 160. Other components of the backlight module 200 are similar to or the same as those of the backlight module 100, and therefore details of other components will not be described further.

[0101] Figure 9 A perspective view of the second diffusion plate 180, illustrating some embodiments disclosed herein, is shown. Figure 10 A top view of the second diffusion plate 180 in some embodiments disclosed herein is shown, while Figure 11 A bottom view of a second diffuser plate 180 according to some embodiments disclosed herein is shown. The second diffuser plate 180 includes a second substrate 182 and a plurality of second ink structures 194. The second ink structures 194 are located on the lower surface 182S1 of the second substrate 182 facing the first diffuser plate 140, and the second ink structures 194 are respectively located directly above the first apex 144A of the prism substructures (e.g., the first prism substructure 146, the second prism substructure 148, the third prism substructure 150, and the fourth prism substructure 152) of the first prism structure 144. When light is refracted from the first apex 144A of the first prism structure 144, the second ink structures 194 can reflect the light back to the first diffuser plate 140 to increase the anti-diffusivity.

[0102] The arrangement of the second ink structure 194 is as follows: Figure 10As shown. The second ink structure 194 and the first ink structure 154 can be made of the same material, therefore the second ink structure 194 also contains titanium dioxide. The weight percentage of titanium dioxide in the second ink structure 194 on the second diffuser plate 180 can be adjusted according to different situations. In some embodiments, the weight percentage of titanium dioxide in the first ink structure 154 on the first diffuser plate 140 is lower than the weight percentage of the second ink structure 194 on the second diffuser plate 180. In some embodiments, the weight percentage of titanium dioxide in the second ink structure 194 on the second diffuser plate 180 is between about 0.1% and about 0.5%. When the weight percentages of titanium dioxide in the first ink structure 154 and the second ink structure 194 are within the disclosed range, light has a better diffuse reflection effect between the first diffuser plate 140 and the second diffuser plate 180, and a higher weight percentage of titanium dioxide in the second diffuser plate 180 can balance light transmission and solve the problem of energy loss due to reflection.

[0103] In some embodiments, the second diffuser plate 180 further includes a second prismatic structure 184, which includes a fifth prismatic substructure 186, a sixth prismatic substructure 188, a seventh prismatic substructure 190, and an eighth prismatic substructure 192. The fifth prismatic substructure 186, the sixth prismatic substructure 188, the seventh prismatic substructure 190, and the eighth prismatic substructure 192 are arranged on the upper surface 182S2 of the second substrate 182, and the upper surface 182S2 of the second substrate 182 is away from the first diffuser plate 140. Each of the fourth prismatic substructures 186 includes a third ridge tip 184A projecting upward from the upper surface 182S2 of the second substrate 182 and a plurality of fourth ridge tips 184B contacting the upper surface 182S2 of the second substrate 182. The fifth prismatic substructure 186, the sixth prismatic substructure 188, the seventh prismatic substructure 190, and the eighth prismatic substructure 192 are similar to the first prismatic substructure 146, the second prismatic substructure 148, the third prismatic substructure 150, and the fourth prismatic substructure 152, respectively. The difference lies in that the dimensions of the first prismatic substructure 146, the second prismatic substructure 148, the third prismatic substructure 150, and the fourth prismatic substructure 152 are larger than those of the fifth prismatic substructure 186, the sixth prismatic substructure 188, the seventh prismatic substructure 190, and the eighth prismatic substructure 192, and the gaps between the second prismatic structures 184 do not have ink structures. Furthermore, the second substrate 182 and the first substrate 142 are also made of similar or the same material.

[0104] like Figure 7 As shown, the arrangement of the second ink structure 194 may align with the first prism structure 144 of the first diffuser plate 140, but may not necessarily align with the second prism structure 184 of the second diffuser plate 180. That is, the arrangement of the second ink structure 194 may not align with the second prism structure 184 of the second diffuser plate 180.

[0105] Figures 12 to 13 A cross-sectional view of the second prismatic structure 184 of some embodiments disclosed herein is shown. Figure 12 The second prismatic structure 184 is drawn along... Figure 10 A cross-sectional view of line CC. Figure 13 Then draw the second prismatic structure 184 along Figure 10 A cross-sectional view of line DD. Note that, for the sake of simplicity, Figure 12 and Figure 13 The second ink structure 194 is not shown. Figure 12 In the structure, the opposing edges of adjacent sixth angular substructure 188 and eighth angular substructure 192 have an angle D4, and the opposing edges of adjacent fifth angular substructure 186 and seventh angular substructure 190 have an angle D5. Figure 13 In the middle, the overlapping edges of the fifth prismatic substructure 186 and the sixth prismatic substructure 188 in a side view have an angle D6. Angles D4, D5 and D6 can be between approximately 90 degrees and 130 degrees, and angles D4, D5 and D6 are respectively perpendicular to the sides of the fifth prismatic substructure 186 and the sixth prismatic substructure 188. Figure 5 and Figure 6 The angles D1, D2, and D3 are the same. When the angles D4, D5, and D6 are within the disclosed range, the second diffuser plate 180 can have a better energy refraction and distribution effect. In addition, the fifth prism substructure 186, the sixth prism substructure 188, the seventh prism substructure 190, and the eighth prism substructure 192 have a height H2, which can be between about 0.1 mm and about 0.3 mm.

[0106] Figure 14A The relative positions of the first diffuser plate 140 and the second diffuser plate 180 are illustrated. When the display has two diffuser plates, such as the first diffuser plate 140 and the second diffuser plate 180, the first diffuser plate 140 may also include some support structures 156, such as... Figure 14AAs shown. The support structure 156 is located on the upper surface 142S of the first substrate 142 and adjacent to the first prism structure 144. For example, the first diffuser plate 140 may include at least three support structures 156, and the support structures 156 may be distributed in the first prism structure 144. The height of the support structure 156 is higher than that of the first prism structure 144. Therefore, the support structure 156 contacts the lower surface 182S1 of the second substrate 182 of the second diffuser plate 180, such that the first prism structure 144 of the first diffuser plate 140 does not touch the second diffuser plate 180, and the first prism structure 144 is separated from the second diffuser plate 180 by a distance L1. In some embodiments, the lower surface 182S1 of the second substrate 182 of the second diffuser plate 180 has a groove 182R, such that the support structure 156 can contact the groove 182R. After the support structure 156 contacts the groove 182R, it can fix the relative positions of the first diffuser plate 140 and the second diffuser plate 180, such as the distance between the first prism structure 144 of the first diffuser plate 140 and the second diffuser plate 180, or the relative position between the second ink structure 194 and the first prism structure 144. When there is a distance L1 between the first prism structure 144 of the first diffuser plate 140 and the second diffuser plate 180, the difference in refractive index between the air and the diffuser plates can provide a good refraction effect of light between the diffuser plates.

[0107] Figures 14B to 14D The diagram illustrates multiple paths of light from the LED chip 120 within the backlight module 100 of the display. Light from the LED chip 120 can enter the first diffuser plate 140 from its lower surface and be refracted from the inclined surface of the first prismatic structure 144, such as... Figure 14B As shown, the refracted light can be reflected by the diffusing agent in the second diffuser 180 (or, when the second diffuser 180 is absent, by the quantum dots in the wavelength conversion film 160), causing the light to be reflected back to the first diffuser 140. When the light is reflected to the first ink structure 154 of the first diffuser 140, the first ink structure 154 can reflect the light back to the second diffuser 180 (or, when the second diffuser 180 is absent, back to the wavelength conversion film 160). In this way, light can undergo diffuse reflection between the first diffuser 140 and the second diffuser 180 (or the wavelength conversion film 160), thereby improving the light mixing effect and enhancing the uniformity of the image.

[0108] Apart from Figure 14B Light can also be like Figure 14CSimilarly, light passes through the portion of the upper surface 142S of the first diffuser plate 140 that is not coated with the first ink structure 154. The transmitted light can enter the second prism structure 184 of the second diffuser plate 180, and the light can be refracted back into the first ink structure 154 of the first diffuser plate 140 by the second prism structure 184. Furthermore, light can also exit from the first tip 144A of the first prism structure 144 of the first diffuser plate 140, such as... Figure 14D Light emitted from the first prism structure 144 can directly reach the second ink structure 194. The light can then be reflected back from the second ink structure 194 to the first diffuser plate 140. This allows for diffuse reflection between the first diffuser plate 140 and the second diffuser plate 180, thereby improving the light mixing effect and enhancing the uniformity of the image. Furthermore, if the display has a backlight module 100 or a backlight module 200, not only can the number of light-emitting diode (LED) chips 120 be effectively reduced, but the same uniformity as a display with a larger number of LED chips 120 can also be achieved, effectively reducing the manufacturing cost of the display.

[0109] Figure 15A The diagram illustrates the brightness uniformity of the backlight module in a display based on known technology. Figure 15B The diagram illustrates the brightness uniformity distribution of the backlight module 200 of a display according to some embodiments of this disclosure. Figure 15A and Figure 15B The Y-axis represents the normalized brightness uniformity. Figure 15A and Figure 15B The X-axis represents horizontal or vertical distance. Figure 15A In the diagram, curve 301 illustrates the horizontal brightness uniformity distribution of the backlight module in a known technology display, and curve 302 illustrates the vertical brightness uniformity distribution of the backlight module in a known technology display. Figure 15B In the diagram, curve 303 illustrates the horizontal brightness uniformity distribution of the backlight module 200 of the display, and curve 304 illustrates the vertical brightness uniformity distribution of the backlight module 200 of the display. From... Figure 15B It can be seen that the brightness uniformity distribution curve of the backlight module 200 of the display is smoother than the brightness uniformity of the backlight module of the display of known technology. Therefore, the brightness uniformity is significantly improved compared with the known technology.

[0110] In summary, the backlight module of the display in some embodiments disclosed herein has a diffuser plate with a specific ink coating structure. For example, the ink structure of the first diffuser plate may be located in the gap between the first prism structures, while the ink structure of the second diffuser plate may be located directly above the first apex of the first prism structure. In this way, light emitted from the light-emitting diode chip can be diffusely reflected between the first and second diffuser plates, improving the light mixing effect and thus enhancing the light uniformity of the display's backlight module. Furthermore, if the display's backlight module has the above-described structure, reducing the amount of light-emitting diode chips used in the display's backlight module can achieve the same effect, thereby reducing the cost of the display.

[0111] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A backlight module for a display, characterized in that, Include: One carrier board; Multiple light-emitting diode chips are arranged on the carrier plate; and A first diffusion plate is located on the carrier and the light-emitting diode chips, wherein the first diffusion plate comprises: A first substrate having an upper surface remote from the carrier plate; A first prismatic structure is located on the upper surface of the first substrate, wherein the first prismatic structure includes a first prismatic substructure and a second prismatic substructure, the first prismatic substructure, the second prismatic substructure and the upper surface of the first substrate together define a gap, and the first prismatic substructure of the first prismatic structure has a first apex protruding from the first substrate and a plurality of second apexes contacting the upper surface of the first substrate; as well as A plurality of first ink structures are located in the gap and in contact with the upper surface of the first substrate, the first ink structures being adjacent to at least one of the second ridge tips of the first prismatic substructure.

2. The backlight module according to claim 1, characterized in that, The first prismatic structure further includes a third prismatic substructure, which forms a V-shaped groove with respect to the first prismatic substructure, and the third prismatic substructure is symmetrical to the first prismatic substructure about the V-shaped groove.

3. The backlight module according to claim 2, characterized in that, These first ink structures are not within the V-shaped groove.

4. The backlight module according to claim 1, characterized in that, The first prismatic structure has a plurality of inclined faces on the upper surface of the first substrate, and the first ink structures are not on these faces.

5. The backlight module according to claim 1, characterized in that, It also includes a second diffusion plate located on the first diffusion plate, wherein the second diffusion plate comprises: A second substrate; and Multiple second ink structures are located on the lower surface of the second substrate facing the first diffuser plate, wherein the first prism substructure and the second prism substructure of the first diffuser plate each have a first apex protruding from the first substrate, and the second ink structures are respectively located directly above the first apex of the first prism substructure and the second prism substructure.

6. The backlight module according to claim 5, characterized in that, The second diffuser plate also includes a second prismatic structure comprising a plurality of fourth prismatic substructures arranged on an upper surface of the second substrate, the upper surface of the second substrate being away from the first diffuser plate, wherein each of the fourth prismatic substructures includes a third apex projecting upward from the upper surface of the second substrate and a plurality of fourth apexes contacting the upper surface of the second substrate.

7. The backlight module according to claim 6, characterized in that, One dimension of the first prismatic substructure of the first diffuser plate is larger than any of the fourth prismatic substructures of the second diffuser plate.

8. The backlight module according to claim 5, characterized in that, The first diffusion plate also includes a support structure located on the upper surface of the first substrate and adjacent to the first prism structure, the height of which is greater than that of the first prism structure.

9. The backlight module according to claim 5, characterized in that, The first weight percentage of titanium dioxide in the first ink structures in the gap of the first diffuser plate is lower than the second weight percentage of titanium dioxide in the second ink structures on the lower surface of the second diffuser plate.

10. The backlight module according to claim 1, characterized in that, Also includes: A wavelength conversion diaphragm is located on the first diffuser plate; and An optical film is located on the wavelength conversion film.

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