TWI550321B - Quantum tube, backlight module and liquid crystal display device - Google Patents

Description

Quantum tube, backlight module and liquid crystal display device

The invention relates to a quantum tube, in particular to a quantum tube having an arc-shaped light-emitting surface, a backlight module equipped with the quantum tube, and a liquid crystal display device equipped with the backlight module.

How to combine energy saving and environmental protection (for example, without using color filters) and display quality (for example, Motion Picture Response Time (MPRT)) is a problem that LCD monitors should continue to improve. If a high-speed liquid crystal (for example, a blue phase liquid crystal) can be used, a liquid crystal display device having both energy saving and environmentally-friendly display quality can be realized. The blue phase liquid crystal is a liquid crystal that reacts at a high speed, and the rising time and the falling time are all below 1 millisecond. High-speed liquid crystals can improve the serious motion blur of liquid crystal display devices. Field Sequential Color (FSC) is a display technology that does not require the use of a color filter. The color filter is reduced, which increases the transmittance of the display panel, but must be matched with a fast response. The liquid crystal will not be slow because of the slow response of the liquid crystal, which reduces the time that the backlight can be lit and increases the complexity of the driving method.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a schematic plan view of a backlight module 10 of the prior art, and FIG. 2 is a schematic cross-sectional view of the liquid crystal display device 1 with the backlight module 10 of FIG. 1 . As shown in FIG. 2 , the liquid crystal display device 1 includes a backlight module 10 and a liquid crystal display panel 12 , wherein the liquid crystal display panel 12 is disposed on the backlight module 10 . The liquid crystal display panel 12 has a blue phase liquid crystal 124 between the upper substrate 120 and the lower substrate 122 and a thin film transistor driving circuit 126. In addition, the liquid crystal display panel 12 can also form a touch sensing circuit 128 on the upper substrate 120 to implement a touch function.

As shown in FIGS. 1 and 2, the backlight module 10 includes a light guide plate 100, a plurality of red light sources 102R, a plurality of green light sources 102G, a plurality of blue light sources 102B, a reflection sheet 104, and an optical film combination 106. In a practical application, a dot pattern or other interference structure may be formed on the light guide plate 100, so that the light emitted by the red light source 102R, the green light source 102G, and the blue light source 102B enters the light guide plate 100, and may be uniformly diffused. The light is emitted toward the liquid crystal display panel 12. The reflective sheet 104 can reflect a portion of the stray light to increase the overall light extraction efficiency. In addition, the optical film assembly 106 disposed above the light guide plate 100 is used to improve the optical characteristics of the light. The optical film included in the optical film assembly 106 may be a cymbal, a diffusion sheet or the like, depending on the practical application.

In the prior art, a plurality of red light sources 102R, a plurality of green light sources 102G, and a plurality of blue light sources 102B are staggered along the sides of the light guide plate 100, and then coupled with the fast-reacting blue phase liquid crystal 124 to be driven by the field color sequential method. The red light source 102R, the green light source 102G, and the blue light source 102B emit light. However, since the luminous efficiency and the lifetime of the red light source 102R, the green light source 102G, and the blue light source 102B are different, the display quality and the service life of the liquid crystal display device 1 are also affected.

One of the objects of the present invention is to provide a quantum tube, a backlight module, and a liquid crystal display device to solve the above problems.

According to an embodiment, the quantum tube of the present invention comprises a tube body, a plurality of first fluorescent particles, and a plurality of second fluorescent particles. The tube body has an arc-shaped illuminating surface. The first fluorescent particles are disposed in the tube. The second fluorescent particles are disposed in the tube.

Preferably, the arc-shaped light-emitting surface is convex or concave.

Preferably, the tube body has a plurality of first compartments, a plurality of second compartments and a plurality of third compartments arranged in a staggered manner, the first fluorescent particles are disposed in the first compartment, and the second fluorescent particles are disposed In the second compartment.

Preferably, the first fluorescent particles are mixed with the second fluorescent particles.

According to another embodiment, the backlight module of the present invention comprises a light guide plate, a plurality of light sources, and a quantum tube as before. The light guide plate has an arc-shaped light incident surface. The light source is disposed adjacent to the arc-shaped light incident surface. The quantum tube is disposed between the arc-shaped light-incident surface and the light source, and the arc-shaped light-emitting surface is opposite to the arc-shaped light-incident surface.

Preferably, the light source emits a first color light, the first phosphor particles convert the first color light into a second color light, and the second fluorescent particles convert the first color light into a third color light.

Preferably, the arc-shaped light-emitting surface is attached to the arc-shaped light-incident surface through an optical adhesive.

Preferably, the light guide plate has a slot, the arc-shaped light incident surface is located in the slot, and the quantum tube is fitted in the slot.

According to another embodiment, the liquid crystal display device of the present invention comprises a backlight module as described above and a liquid crystal display panel. The liquid crystal display panel is disposed on the backlight module.

Preferably, the liquid crystal display panel is a blue phase liquid crystal display panel.

In summary, the present invention provides a quantum tube having an arc-shaped light-emitting surface between an arc-shaped light incident surface of the light guide plate and a plurality of light sources, and a plurality of first fluorescent particles and a plurality of second portions are disposed in the quantum tube. Fluorescent particles. Therefore, the plurality of light sources may be light sources (eg, blue light sources) that emit the same first color light, and then convert the first color light (eg, blue light) into the second color light (eg, red light) by the first fluorescent particles. And converting the first color light (eg, blue light) to the third color light (eg, green light) by the second fluorescent particles. Thereby, the invention can ensure the luminous efficiency and the life consistency of the plurality of light sources in the backlight module. In addition, since the first fluorescent particles and the second fluorescent particles are disposed in the quantum tube and are not directly in contact with the light source, the first fluorescent particles and the second fluorescent particles are prevented from being subjected to the high heat generated by the light source to generate light. Decay phenomenon. Furthermore, when the arc-shaped light-emitting surface of the equivalent sub-tube is concave, and the arc-shaped light-incident surface of the light guide plate is convex, the central luminance of the backlight module can be effectively improved; and the arc-shaped light-emitting surface of the equivalent sub-tube is convex, and When the arc-shaped light incident surface of the light guide plate is a concave surface, the display quality of the liquid crystal display device can be made more uniform. Moreover, the present invention can fix the quantum tube to the outside of the light guide plate by using an optical glue or other similar colloid, or directly fit the quantum tube into the groove of the light guide plate.

The advantages and spirit of the present invention can be obtained by the following detailed description of the invention and the accompanying drawings. Go to further understanding.

1, 2‧‧‧ liquid crystal display device

10, 20, 30, 40, 50‧‧‧ backlight modules

12, 22‧‧‧ LCD panel

100,200‧‧‧Light guide plate

102R‧‧‧Red light source

102G‧‧‧Green light source

102B‧‧‧Blue light source

104, 204‧‧‧ reflection film

106, 206‧‧‧ Optical film combination

120, 220‧‧‧ upper substrate

122, 222‧‧‧ lower substrate

124, 224‧‧‧ blue phase liquid crystal

126, 226‧‧‧film transistor drive circuit

128, 228‧‧‧ touch sensing circuit

202‧‧‧Light source

208‧‧‧Quantum tube

210‧‧‧pipe body

212‧‧‧First fluorescent particles

214‧‧‧Second fluorescent particles

216‧‧‧Optical adhesive

2000‧‧‧Arc-shaped surface

2002‧‧‧ slotting

2100‧‧‧Arc-shaped illuminating surface

2102‧‧‧First compartment

2104‧‧‧Second compartment

2106‧‧‧ third compartment

FIG. 1 is a top plan view of a backlight module of the prior art.

Fig. 2 is a schematic cross-sectional view showing a liquid crystal display device in which the backlight module of Fig. 1 is mounted.

FIG. 3 is a top plan view of a backlight module according to a first embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view showing a liquid crystal display device in which the backlight module of Fig. 3 is mounted.

FIG. 5 is a top plan view of a backlight module according to a second embodiment of the present invention.

FIG. 6 is a top plan view of a backlight module according to a third embodiment of the present invention.

FIG. 7 is a top plan view of a backlight module according to a fourth embodiment of the present invention.

Please refer to FIG. 3 and FIG. 4 , FIG. 3 is a schematic top view of the backlight module 20 according to the first embodiment of the present invention, and FIG. 4 is a liquid crystal display device 2 equipped with the backlight module 20 of FIG. 3 . Schematic diagram of the section. As shown in FIG. 4 , the liquid crystal display device 2 includes a backlight module 20 and a liquid crystal display panel 22 , wherein the liquid crystal display panel 22 is disposed on the backlight module 20 . In this embodiment, the liquid crystal display panel 22 may have a blue phase liquid crystal 224 and a thin film transistor driving circuit 226 between the upper substrate 220 and the lower substrate 222. When the liquid crystal display panel 22 has the blue phase liquid crystal 224, the liquid crystal display panel 22 is a blue phase liquid crystal display panel, and the liquid crystal display panel 22 can be a field color sequential liquid crystal display panel. The Field Sequential Color (FSC) is a display technology that does not require a color filter. The color filter is reduced, and the transmittance of the liquid crystal display panel 22 can be increased, but it must be matched. The fast-reacting blue phase liquid crystal 224 does not slow down the reaction of the liquid crystal, reducing the time that the backlight module 20 can be lit and increasing the complexity of the driving method. In addition, the liquid crystal display panel 22 can also form a touch sensing circuit 228 on the upper substrate 220 to implement a touch function.

As shown in FIG. 3 and FIG. 4 , the backlight module 20 includes a light guide plate 200 , a plurality of light sources 202 , a reflective sheet 204 , an optical film assembly 206 , and a quantum tube 208 . Actually In the light guide plate 200, a dot pattern or other interference structure may be formed on the light guide plate 200 so that the light emitted from the light source 202 enters the light guide plate 200 and is uniformly diffused to be emitted toward the liquid crystal display panel 22. The reflective sheet 204 can reflect part of the stray light to increase the overall light extraction efficiency. In addition, the optical film assembly 206 disposed above the light guide plate 200 is used to improve the optical characteristics of the light. The optical film included in the optical film assembly 206 may be a cymbal, a diffusion sheet or the like, depending on the practical application.

As shown in FIG. 3, the quantum tube 208 includes a tube body 210, a plurality of first fluorescent particles 212, and a plurality of second fluorescent particles 214, wherein the tube 210 has an arc-shaped light emitting surface 2100, and the first fluorescent light The particles 212 are disposed in the tube 210, and the second phosphor particles 214 are also disposed in the tube 210. In this embodiment, the tubular body 210 has a plurality of first compartments 2102, a plurality of second compartments 2014, and a plurality of third compartments 2016, wherein the first fluorescent particles 212 are disposed in the first compartment. In 2012, the second fluorescent particles 214 are disposed in the second compartment 2014, and no fluorescent particles are disposed in the third compartment 2016.

The light guide plate 200 has an arc-shaped light incident surface 2000, and the light source 202 is disposed adjacent to the arc-shaped light incident surface 2000. The quantum tube 208 is disposed between the arc-shaped light-incident surface 2000 of the light guide plate 200 and the plurality of light sources 202, and the arc-shaped light-emitting surface 2100 of the quantum tube 208 is opposite to the arc-shaped light-incident surface 2000 of the light guide plate 200. In this embodiment, the arc-shaped light-emitting surface 2100 of the quantum tube 208 is a concave surface, and the arc-shaped light-incident surface 2000 of the light guide plate 2 (0) is a convex surface. Therefore, the arc-shaped light-emitting surface 2100 of the quantum tube 208 can be attached to the arc-shaped light-incident surface 2000 of the light guide plate 200 through an Optical Clear Adhesive (OCA) 216 or other similar colloid. In addition, the light source 202 can also be attached to the other side of the quantum tube 208 by an optical glue 216 or other similar gel.

In this embodiment, the light source 202 can emit a first color light, the first fluorescent particles 212 can convert the first color light into a second color light, and the second fluorescent particles 214 can convert the first color light into a third color. Shade. For example, the light source 202 can be a blue LED, so the first color light emitted by the light source 202 is blue light. In this case, the first fluorescent particles 212 can convert blue light into red light (that is, the second color light). Fluorescent particles, and the second fluorescent particles 214 can convert blue light to green light (that is, the third color Light) of fluorescent particles. Therefore, when the blue light emitted by the light source 202 passes through the first compartment 2102, the second compartment 2014 and the third compartment 2016 of the quantum tube 208, respectively, red light, green light and blue light are generated, and then the light guide plate 200 is passed through. Guided and evenly mixed. Since the arc-shaped light-emitting surface 2100 of the quantum tube 208 is a concave surface, and the arc-shaped light-incident surface 2000 of the light guide plate 200 is a convex surface, the light emitted by the light source 202 enters the light guide plate through the arc-shaped light-emitting surface 2100 and the curved light-incident surface 2000. At 200 o'clock, the light will be concentrated inward, thereby effectively improving the central luminance of the backlight module 20.

Please refer to FIG. 5 , which is a top plan view of a backlight module 30 according to a second embodiment of the present invention. The main difference between the backlight module 30 and the backlight module 20 is that in the backlight module 30, the arc-shaped light-emitting surface 2100 of the quantum tube 208 is convex, and the arc-shaped light-incident surface 2000 of the light guide plate 200 is concave. . When the light emitted by the light source 202 enters the light guide plate 200 through the arc-shaped light-emitting surface 2100 and the curved light-incident surface 2000, the light is diffused outward, thereby making the display quality of the liquid crystal display device more uniform.

Please refer to FIG. 6. FIG. 6 is a schematic top view of a backlight module 40 according to a third embodiment of the present invention. The main difference between the backlight module 40 and the backlight module 20 is that in the backlight module 40, the first fluorescent particles 212 and the second fluorescent particles 214 are mixed. When the blue phase liquid crystal is not disposed in the liquid crystal display device, the backlight module 40 in FIG. 6 can be used to provide light.

Please refer to FIG. 7. FIG. 7 is a schematic top view of a backlight module 50 according to a fourth embodiment of the present invention. The main difference between the backlight module 50 and the backlight module 20 is that, in the backlight module 50, the light guide plate 200 has a slot 2002, and the arc-shaped light incident surface 2000 is located in the slot 2002, and the quantum tube 208 Fitted into the slot 2002. In this embodiment, since the quantum tube 208 can be directly fitted into the slot 2002, it is not necessary to use the aforementioned optical glue 216 or other similar glue for fixing.

In summary, the present invention provides a quantum tube having an arc-shaped light-emitting surface between an arc-shaped light incident surface of the light guide plate and a plurality of light sources, and a plurality of first fluorescent particles and a plurality of second portions are disposed in the quantum tube. Fluorescent particles. Therefore, the plurality of light sources may be light sources that emit the same first color light (eg, blue light sources), and then convert the first color light (eg, blue light) into the second color light by the first fluorescent particles (eg, For example, red light) and the first color light (eg, blue light) is converted to a third color light (eg, green light) by the second fluorescent particles. Thereby, the invention can ensure the luminous efficiency and the life consistency of the plurality of light sources in the backlight module. In addition, since the first fluorescent particles and the second fluorescent particles are disposed in the quantum tube and are not directly in contact with the light source, the first fluorescent particles and the second fluorescent particles are prevented from being subjected to the high heat generated by the light source to generate light. Decay phenomenon. Furthermore, when the arc-shaped light-emitting surface of the equivalent sub-tube is concave, and the arc-shaped light-incident surface of the light guide plate is convex, the central luminance of the backlight module can be effectively improved; and the arc-shaped light-emitting surface of the equivalent sub-tube is convex, and When the arc-shaped light incident surface of the light guide plate is a concave surface, the display quality of the liquid crystal display device can be made more uniform. Moreover, the present invention can fix the quantum tube to the outside of the light guide plate by using an optical glue or other similar colloid, or directly fit the quantum tube into the groove of the light guide plate.

The above is only the preferred embodiment of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

20‧‧‧Backlight module

200‧‧‧Light guide plate

202‧‧‧Light source

208‧‧‧Quantum tube

210‧‧‧pipe body

212‧‧‧First fluorescent particles

214‧‧‧Second fluorescent particles

216‧‧‧Optical adhesive

2000‧‧‧Arc-shaped surface

2100‧‧‧Arc-shaped illuminating surface

2102‧‧‧First compartment

2104‧‧‧Second compartment

2106‧‧‧ third compartment

Claims (4)

A quantum tube comprising: a tube body having a concave arc-shaped light exiting surface; a plurality of red fluorescent particles disposed in the tube body; and a plurality of green fluorescent particles disposed in the tube body; wherein The red fluorescent particles are mixed with the green fluorescent particles. A backlight module comprising: a light guide plate having a convex arc-shaped light incident surface; a plurality of blue light sources disposed adjacent to the convex arc-shaped light incident surface; and the quantum tube as set forth in claim 1 Between the convex arc-shaped light incident surface and the blue light source; wherein the concave arc-shaped light exiting surface of the quantum tube is adhered to the convex arc-shaped light incident surface of the light guide plate through the colloid. A liquid crystal display device comprising: a backlight module as claimed in claim 2; and a liquid crystal display panel disposed on the backlight module. The liquid crystal display device of claim 3, wherein the liquid crystal display panel is a blue phase liquid crystal display panel.