TWI276896B - Planar light source - Google Patents

Abstract

A planar light source is provided, and the planar light source includes a first plasma planar lamp and a second plasma planar lamp. The second plasma planar lamp is disposed on the first plasma planar lamp. The first and second plasma planar lamp have a plurality of bright regions and dark regions, respectively, wherein through allocating the bright regions and the dark regions, the light emitted from the bright regions of the first plasma planar lamp is able to pass through the dark regions of the second plasma planar lamp. As mentioned above, the brightness of the planar light source can be improved.

Description

1276· twf.doc/r IX. DESCRIPTION OF THE INVENTION: FIELD OF THE INVENTION The present invention relates to a planar light source, and more particularly to a planar light source utilizing plasma display technology. [Prior Art]

Due to the increasing demand for displays, Thin Film Transistor Liquid Crystal Display (TFT-LCD), which has high image quality, good space utilization efficiency, low power consumption, and no radiation, has gradually become a thin film transistor liquid crystal display (TFT-LCD). The mainstream of the market. A thin film transistor liquid crystal display device and a '' is mainly composed of a liquid crystal display panel and a backlight module. The liquid crystal display panel is generally composed of a thin film transistor array substrate, a color filter substrate, and a liquid crystal layer disposed between the two substrates. In addition, the backlight module is used to provide a surface light source required for the liquid crystal display panel, so that the liquid can not be used to achieve the display effect.

^, the planar light source used in the front backlight module usually uses a cold cathode fluorescent lamp (CCFL) as a line source, and then uses a diffusion sheet or a light guide plate to provide a uniform planar light source. . Because of t, another planar k source fabricated using plasma display technology has been developed. In more detail, the planar light source is a plasma light-emitting element. The main purpose is to apply a high voltage difference between the pair of electrodes to dissociate the discharge gas between the bond and the anode into a plasma gas, and the plasma is Excited excited atoms will emit ultraviolet light to excite the fluorescent powder to emit light. 5, I2768Q Valley 3twf.doc/r Figure 1A! The cross-sectional view of the planar light source is not known, and Figure 1B shows a partial top view of the white light source. Referring to FIG. 1A and FIG. 1 , the conventional planar light source 1GG includes a substrate 11G, a plurality of electrode groups 12A, a substrate 130, a frame 140, a plurality of spacers 15 and a phosphor powder 160. These electrode groups 12 are disposed on the substrate n, and the substrate 13 is disposed on the substrate m. The frame 14G is disposed between the substrate 11G and the substrate 13A, and the substrate 110, the substrate 130 and the frame 14 surround a discharge chamber, wherein the discharge chamber is filled with a discharge gas. These spacers 15G are disposed between the substrate 110 and the substrate 130 to partition the substrate 11 from the substrate. Further, the phosphor powder 160 is disposed on the substrate 110 and the substrate 13A, and covers the electrode group 120. In more detail, each electrode group 120 includes sub-electrodes 122, 124 and 126' wherein the sub-electrode 122 has a plurality of discharge portions 122a that face the sub-electrodes 124 and 126, respectively. Further, a dielectric layer 120a is covered on the sub-electrodes 122, 124 and 126, respectively. In addition, all of the sub-electrodes 124 and 126 are electrically connected, and all of the sub-electrodes 122 are electrically connected to each other. Therefore, when the conventional planar light source operates, the discharge portion 122& and the corresponding f-electrode 124 and 126 are discharge regions, so that the phosphor powder located in the discharge region can be excited to emit light. . In other words, from the appearance, the conventional flat light source 100 will have a plurality of bright areas 1 〇〇 a and a plurality of dark areas 1 . However, in order to reduce the influence of the dark areas of these bright areas l〇〇a and l〇〇b, the conventional planar light source 1〇〇 usually needs to be matched with a diffusion sheet (not shown), but the diffusion sheet reduces the planar light source 100. Brightness. If the drive current is increased in order to increase the enthalpy of the conventional planar source 100, the life of the conventional planar light source 1 〇〇 , 127 is shortened. SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a flat surface light source that provides uniformity. & source

Based on the above or other objects, the present invention provides a source comprising a -first plasma flat lamp and a second plasma flat lamp disposed on the first electric plane lamp. The second to the second:: the middle lamp and the second plasma flat lamp respectively have a plurality of bright areas and a plurality of dark water=surface bright areas and dark areas, so that the first-plasma plane light is rounded off. The light is applied through these dark areas of the second plasma lamp. According to an embodiment of the invention, the positions of the first plasma flat lamps and the dark regions of the first plasma flat lamp may overlap: in accordance with an embodiment of the invention, the bright regions and the dark regions are The shape of the zone can be a triangle. In accordance with an embodiment of the invention, the bright areas and the dark areas are rectangular in shape.

According to an embodiment of the invention, the first plasma flat lamp and the second plasma flat lamp respectively comprise a first substrate, a plurality of electrode groups, a second substrate, a frame, a plurality of spacers and a phosphor powder. The electrode groups are disposed on the first substrate, and the second substrate is disposed on the first substrate. The frame is disposed between the second substrate and the first substrate, and the first substrate, the second substrate and the frame enclose a discharge cavity, and a discharge gas is filled in the discharge cavity. The spacers are disposed between the second substrate and the first substrate to separate the second substrate from the first substrate. The phosphor powder is disposed on the 基板C/r of the first substrate and the second substrate corresponding to the bright regions. :: Ben: The first embodiment of the first plasma plane 2: the first substrate of the two plasma flat lamps. Further, the chelate powder of the first plasma flat lamp can further illuminate the position of the substrate of the present invention corresponding to the dark regions. In addition, some of the spacers may be separate from the electrodes. The shape of the turtle-proof spacer may be strip-shaped. In the first example, each electrode group includes a -first-sub-electrode, a sub-electron nucleus 2, a third sub-electrode and a fourth sub-electrode, wherein the first electric part, the second one is a good one discharge unit. The second sub-electrode has a plurality of second discharges. a _ _ disciple electrode, and the first discharge portion is located between the first sub-electrode and the second sub-electrode toward the second sub-dipole, and the upper, second, and third sub-electrodes are Arranged in parallel. Each of the third sub-electrodes of the electrode group may further have a plurality of first Is facing the first electrode and the second electrode, respectively. Each of the third sub-electrode groups may further include a fourth sub-electrode between the electro-optical and the second sub-electrode, wherein the first sub-electrode, the second sub-electrode, the music electrode and the fourth sub-electrode Arranged in parallel. In addition, the third sub-electrode of each electrode group may further have a plurality of third discharge portions, which may have a plurality of fourth discharge portions toward the first electrode and each of the fourth sub-electrodes of the electrode groups. Facing the second electrode. According to an embodiment of the invention, each electrode group includes a first sub-electrode, a second sub-electrode and a third sub-electrode, wherein the first sub-electrode has a plurality of first-discharge portions and the first-sub-electrode is located at a second sub-electrode and a third sub-electrode Ι2?6· twf.doc/r pole, and the first sub-electrode, the first: the second sub-electrode and the third sub-electrode, the second sub-electrode group The extremely parallel row, the two discharge portions, which may have a plurality of first poles facing the first pole, may have a plurality of third "sections, two:::u three sons, electric gas, gas selection, gas, 氖

The planar light is stacked, and the lower layer is thus the same as the above-described and other objects of the present invention. [Embodiment] [First Embodiment]

Fig. 2 is a schematic cross-sectional view showing a planar light source in accordance with a first embodiment of the present invention. 2A is a partial top plan view of the first plasma flat lamp of FIG. 2, and FIG. 2C is a partial top view of the second plasma flat lamp of FIG. Referring to FIG. 2, the planar light source 1A of the present embodiment includes a first plasma flat lamp 1100 and a second plasma flat lamp 12 (8), wherein the second plasma flat lamp 1200 is disposed on the first plasma flat lamp.丨丨(8), and the light emitted by the first plasma flat lamp 1100 passes through the dark area 1200b of the second plasma flat lamp 1200. Therefore, the planar light source 1 〇 can provide a uniform surface light source 0 1276 job twf.doc/r Referring to FIG. 2A and FIG. 2B , the first plasma flat lamp light comprises a substrate 1110 , a plurality of electrode groups 112 , a substrate 1130 , a frame 114 , a plurality of spacers 1150 and a phosphor powder 1160 . The electrode groups 112 are disposed on the substrate 1110, and the substrate 1130 is disposed on the substrate ni(). The frame 1140 is disposed between the substrate 1010 and the substrate 1130, and the substrate 111, the substrate 1130 and the frame 1140 surround a discharge cavity, wherein the discharge cavity is filled with a discharge gas, and the discharge gas may be helium, neon or argon. Or a combination thereof. The spacers 1150 are disposed between the substrate mo and the substrate 113〇 to separate the substrate 1Π0 and the substrate 1130, and the spacers n5〇 may also separate the electrode groups 1120, wherein the spacers 115〇 may be in the shape of strips. Shape, column or other shape. Further, the phosphor powder 116 is disposed on the substrate 1110 and the substrate 1130. For example, the phosphor powder 116 〇 may also be disposed on the substrate 1110 or the substrate 1130 corresponding to the bright area 11 〇〇 a and the dark area 1100 b, however, the phosphor powder may also be disposed only on the substrate 1110 and/or the substrate 1130. Corresponding to the position of the bright area 1100a. In more detail, each electrode group 1120 includes sub-electrodes H22, 1124, 1126, and 1128, wherein the sub-electrodes 1122, 1124, 1126, and 1128 may be arranged in parallel. Further, a dielectric layer 1120a is covered on the sub-electrodes U22, n24, n26, and I128, respectively. All of the sub-electrodes 1122 and 1124 are electrically connected to each other, and all of the sub-electrodes 1126 and 1128 are electrically connected to each other. Further, the sub-electrode 1126 has a plurality of discharge portions 112 such as to face the sub-electrodes 1122, respectively, and the sub-electrodes 1128 have a plurality of discharge portions 1128a' which are directed toward the sub-electrodes 1124. Therefore, between the discharge portion U26a and the sub-electrode 1122 and between the discharge portion n28a and the sub-electrode 1124 10 127 68l^^3twf.doc/r, a plurality of rectangular bright regions 11 〇〇 a and The dark area of the triangle is 1100b. However, the shape of the bright area 11 〇〇 a and the dark area π 00b is not limited to a triangle, and the shape of the bright area ll 〇〇 a and the dark area U 〇 b depends on the pattern of the sub-electrodes in each of the pen group 1120. It should be noted that the sub-electrodes 1122 and 1124 of this embodiment may also be integrated into one body. Referring to FIG. 2A and FIG. 2C, the second plasma flat lamp 12A is similar to the first plasma flat lamp 1100, and the second plasma flat lamp 12A also includes a substrate 1130, a plurality of electrode groups 1220, and a The substrate 1230, a frame 124, and a plurality of spacers 1250 and a phosphor powder 1260. These electrode groups 1220 are disposed on the substrate 1130, and the substrate 1230 is disposed on the substrate mo. The frame 1240 is disposed between the substrate 1130 and the substrate 123A, and the substrate 113A, the substrate 1230 and the frame 1240 surround a discharge cavity, wherein a discharge gas is disposed in the discharge cavity. The spacers 1250 are disposed on the substrate! Between the substrate '123〇, the spacer substrate 1130 and the substrate 1230 are considered, and the spacers 1250 may also be separated from the electrode groups 122A, wherein the spacers 125〇 may have a strip shape, a column shape or other shapes. The substrate 1130 is both the first part of the first plasma flat lamp and the second part of the second plasma=face lamp 1200. In other words, the first electric paddle lamp 1100 and the second electric plane lamp The substrate 113Q is shared, however, the first electrical panel light 11=0 and the second plasma planar lamp can also be independent of each other. The mother fast group 1220 includes sub-electrodes 1222, 1224 and 1226, which are sub-electrodes 1222, (2) 4 and m6 may be parallel rows, and further, 1222 has a plurality of discharge portions m2a, respectively facing the sub-electrodes, 1226. Therefore, from the appearance, the second plasma flat lamp l2768^^3twf.doc /r has multiple squares of bright areas 12 〇a and the dark area of the triangle are 12〇. In addition, the phosphor powder 1260 is disposed corresponding to the substrate ιΐ3〇 and/or the substrate 1230 of the bright area 12_, but the phosphor powder 126〇 may be simultaneously disposed on the substrate 1130 or the substrate. In the dark area i2〇〇b of the second plasma plane S 1100, the position of the dark areas i2〇0b of the second plasma plane lamp 12GG may be The overlapping, so that the first plasma flat lamp 11 〇〇 these bright areas 1 difficult to emit light? The second plasma touches the dark area 1200b of 12 (10). In other words, the planar light source 1本 of the embodiment can not only Providing a uniform surface light source's higher brightness. Further, under the same brightness and uniformity requirements, the driving current of the first plasma touch H (8) and the second electric polymerization plane k 1200 The planar light source 10 of the present embodiment has a long service life. [2] FIG. 3A is a schematic top view of a first plasma flat lamp according to a second embodiment of the present invention, and Figure 3B shows the first pulp plane in accordance with the second embodiment of the present invention. A partial top view of the first embodiment of the present invention is similar to the above embodiment, except that each electrode group 2120 includes sub-electrodes 2122, 2124, 2126 and 2128, wherein the sub-electrodes 2122, 2124, 2126 The sub-electrodes 2126 may have a plurality of discharge portions 2126a, and the sub-electrodes 2122 also have a plurality of discharge portions 2122a', wherein the discharge portions 2126a and the discharge portions 212 are opposed to each other. In other words, a plurality of rectangular bright areas 2100a and rectangular dark areas 21〇〇b can be divided in the area between the sub-electrodes 2126 and 2122. 12 1276886 3twf.doc/r Similarly, the 'sub-electrode 2124 has a plurality of discharge portions 2124a, and the sub-electrodes 2128 also have a plurality of discharge portions 2128a, wherein the discharge portions 2124a and the discharge portions 2128a are opposed to each other, and at the sub-electrodes 2124 A plurality of rectangular bright areas 2100a and rectangular dark areas 2100b can be divided into an area between 2128 and 2128b. Further, the sub-electrodes 2122 and 2124 may also be integrated (similar to the sub-electrode 2222). With continued reference to FIG. 3B, each electrode set 2220 includes sub-electrodes 2222, 2224, and 2226, wherein sub-electrodes 2222, 2224, and 2226 can be arranged in parallel. The sub-electrode 2222 has a plurality of discharge portions 2222a that face the sub-electrodes 2224 and 2226, respectively. Further, the sub-electrode 2224 also has a plurality of discharge portions 2224a, and the sub-electrodes 2226 also have a plurality of discharge portions 222 such as a portion of the discharge portion 2222a and the discharge portion 2224a facing each other, and a portion of the discharge portion 2222a and the discharge portion 2226a of the other portions. Opposite each other. Therefore, a plurality of rectangular bright regions 22GQa and rectangular dark regions 22 can be divided between the sub-electrodes 2226 and 2222 and in the regions of the sub-electrodes 2224 and 2222. Since the rectangular dark area 22_ overlaps with the position of the rectangular bright area cut a, the light of the lower plasmonic plane light can pass through the dark area of the t-th plasma plane light to Provide a uniform surface source. According to the red, the planar light source of this judgment has at least the following advantages: · The light emitted by the bright area of the lower layer of the electric plane light can wear a surface light source capable of providing a uniform hook, and has a higher brightness. Flat 1 mesh ==Technology' The first plasma flat lamp of the present invention and the first-electric water surface need less _ moving current, so the hair surface flat lamp 13 l2768S4twf.doc/r source has a longer use life. The preferred embodiments of the present invention are disclosed as: ^^明明: Anyone skilled in the art, without departing from the spirit of the present invention: within the target circumference, when a little change and retouching can be made, therefore::: This is subject to the definition of the scope of the patent application. ‘, 边“Simplified illustration of the drawing FIG. 1A is a schematic cross-sectional view of a conventional planar light source.

FIG. 1B is a partial top plan view of a conventional planar light source. Figure 2A is a schematic view of a planar light source in accordance with a first embodiment of the present invention. ... Figure 2B shows a partial top view of the first plasma flat lamp in Figure 2A

2C illustrates a partial top view of the second plasma flat lamp of FIG. 2A. FIG. 3A illustrates a partial pure shirt of the first mine according to the second embodiment of the present invention. ^Face light

3B is a partial top plan view of a second electric device according to a second embodiment of the present invention.乂"Face Light [Description of Main Components] 10: Flat Light Source 100: Conventional Planar Light Sources 100a, 1100a, 1200a, 2100a, 2200a · Bright Area 100b, ll〇〇b, 1200b, 2100b, 2200b ·· Dark areas 110, 130, 1110, 1130, 1230: substrate 14 127 68Q^3twf.doc/r 120, 1120, 1220, 2120, 2220: electrode sets 120a, 1120a · dielectric layers 122, 124, 126, 1122 1124, 1126, 1128, 1222, 1224, 1226, 2122, 2124'2126, 2128, 2222, 2224, 2226: sub-electrodes 122a, 1126a, 1128a, 1222a, 2122a ' 2124a, 2126a, 2128a, 2222a, 2224a, 2226a: Discharge portion 140, 1140, 1240: frame 150, 1150, 1250: spacer 160, 1160, 1260: phosphor powder 1100: first plasma flat lamp 1200 ·• second plasma flat lamp

15

Claims (1)

, 1^7 68Q^3twf.doc/r X. Patent application scope: 1. A planar light source, comprising: a first plasma flat lamp; and a second plasma flat lamp, disposed in the first plasma The first plasma flat light and the second plasma flat light respectively have a plurality of bright areas and a plurality of dark areas, and the first and second dark areas are disposed through the positions of the bright areas and the dark areas. Light from the bright areas of the plasma flat light passes through the dark areas of the second plasma flat light. The planar light source of claim 1, wherein the positions of the bright areas of the first plasma flat light overlap with the positions of the dark areas of the second plasma flat light. 3. The flat light source of claim 1, wherein the bright areas and the dark areas are triangular in shape. 4. The planar light source of claim 1, wherein the party areas and the dark areas are rectangular in shape. 5. The planar light source of claim 1, wherein the first φ-pulp flat lamp and the second plasma flat lamp respectively comprise: a first substrate; a plurality of electrode groups disposed in the first a second substrate disposed on the first substrate; a frame disposed between the second substrate and the first substrate, wherein the first substrate, the second substrate, and the frame are a discharge chamber, and a discharge gas is filled in the discharge chamber; a plurality of spacers are disposed between the second substrate and the first substrate between 16 Ι 2768 Θ 6 3 twf. doc / r to separate the second substrate from the first a substrate; and a phosphor powder disposed at a position corresponding to the plurality of party regions of the first substrate and the second substrate. 6. The planar light source of claim 5, wherein the second substrate of the first plasma flat lamp further serves as the first substrate of the second plasma flat lamp. 7. The planar light source of claim 5, wherein the phosphor of the first plasma flat lamp further comprises: a dark space disposed on the first substrate and the second substrate corresponding to the dark regions. Location. 8. The planar light source of claim 5, wherein the spacers separate the electrode sets. 9. The planar light source of claim 8, wherein the spacers comprise a strip shape. 10. The planar light source of claim 5, wherein each of the electrode sets comprises: a first sub-electrode having a plurality of first discharge portions; and a second sub-electrode having a plurality of second portions a discharge portion facing the first sub-electrode, wherein the first discharge portions face the second sub-electrode; and a third sub-electrode between the first sub-electrode and the second sub-electrode The sub-electrode, the second sub-electrode and the third sub-electrode are arranged in parallel. 11. The planar light source of claim 10, wherein the third sub-electrode of each of the electrode sets has a plurality of third discharge portions facing the first sub-electrode and the second sub-electrode, respectively . The flat light source of claim </ RTI> wherein each of the electrode sets further comprises a fourth sub-electrode located at the third sub-electrode and the second sub-electrode The first sub-electrode, the second sub-electrode, the third sub-electrode and the fourth sub-electrode are arranged in parallel. 13. The planar light source of claim 12, wherein the third sub-electrode of each of the electrode sets has a plurality of third discharge portions facing the first electrode and each of the electrodes The fourth sub-electrode of the group has a plurality of fourth discharge portions facing the second electrode. 14. The planar light source of claim 5, wherein each of the electrode sets comprises: a first sub-electrode having a plurality of first discharge portions; a second sub-electrode; and a first a third sub-electrode, the first sub-electrode is located between the second sub-electrode and the third sub-electrode, and the first discharge portions are respectively facing the second sub-electrode and the third sub-electrode, and the first sub-electrode The electrode, the second sub-electrode and the third sub-electrode are arranged in parallel. The flat light source of claim 14, wherein the second sub-electrode of each of the electrode groups has a plurality of second discharge portions facing each of the first sub-electrodes 5 The second sub-electrodes of the electrode groups have a plurality of third discharge portions facing the first sub-electrodes. The planar light source of claim 5, wherein the discharge gas is one selected from the group consisting of helium, neon, argon, and combinations thereof. 18