1333582 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種照明裝置，且特別是有關於一種 平面光源結構。 .. 【先前技術】 • 平面光源結構為液晶顯示器（Liquid Crystal Display ; LCD)之基礎零件之—。平面光源結構的主要功能係在提 • #足夠的亮度以及分布均勻的光源，以使液晶顯示器能夠 顯示影像。 般而。，平面光源的結構通常是由上基板及下基板 所組成。其中，上述之下基板係面對上基板設置，且此下 基板具有複數個阻隔壁與上基板形成複數個發光腔體。這 些發光腔體内部具有螢光粉層及放電氣體(例如：氬氖、 氙或汞），使其在通電以後能發光。在製造平面光源結構 時，上、下基板之間的封合是藉由在阻隔壁的表面上塗佈 ·#著劑來達成。然而，為了均勻地塗佈黏著劑，阻隔壁上 通常要有特殊結構或分佈（例如：利用網印技術來網印黏著 劑）’才能避免黏著劑溢流進入發光腔體，但如此複雜的技 術卻使得製程困難度大幅提高。 雖然目前有其他製程改進方式，例如將黏著 劑塗佈在 -了基板面對於上基板之表面的邊緣上來進行封合。此法並 .未在阻隔壁上塗佈黏膠，而是利用上、下基板的重量來使 ，隔壁與上基板緊密貼合。但實際上，應用此法往往因黏 著劑的厚度太厚’導致阻隔壁的上表面與上基板基板間產 1333582 生空隙，因此在啟動平面光源結構後，電漿將穿過阻隔壁 與上基板間的空隙，造成發光腔體難以全數點亮。此外， 也因為阻隔壁的上表面與上基板具有空隙，因此原本被封 入發光腔H中的采將滲人阻隔冑巾，導致使用壽命及亮度 迅速下降。 又 因此’如何能夠簡化平面光源結構之上、下基板的封 合製程’並同時緊密封合阻隔壁的上表面與上基板，是液 晶顯示器相關產業的製造者、販售者及使用者所殷殷企盼。 【發明内容】 因此本發明一方面就是提供一種平面光源結構，其係 藉由凹槽結構來降低黏膠的厚度，進而讓阻隔壁與上基板 能緊密封合，使得平面光源結構的使用壽命及亮度上升， 並同時簡化封合製程。 依照本發明一較佳實施例’此平面光源結構係由上基 板、下基板、凹槽結構及黏膠所構成。其中，下基板係面 對上基板设置’且此下基板具有複數個阻隔壁。上述之阻 隔壁係與上基板形成複數個發光腔體。凹槽結構係位於下 基板面對上棊板之表面的邊緣上。而黏夥亦配置於上述之 表面的邊緣，用以黏合上基板與下基板。 依照本發明另一較佳實施例，此平面光源結構係由上 基板、下基板、凹槽結構及黏膠所構成。其中，下基板係 面對上基板設置，且此下基板具有複數個阻隔壁。上述之 阻隔壁係與上基板形成複數個發光腔體。凹槽結構係位於 上基板面對下基板之表面的邊緣上。而黏膠亦配置於上述 7 1333582 之表面的邊緣，用以黏合上基板與下基板。 依照本發明再一較佳實施例，此平面光源結構係由上 基板、下基板、第一凹槽結構、第二凹槽結構及黏膠所構 成。其中，下基板係面對上基板設置，且此下基板具有複 數個阻隔壁。上述之阻隔壁係與上基板形成複數個發光腔 體。第一凹槽結構係位於上基板面對下基板之下表面的第 一邊緣上。第二凹槽結構係位於下基板面對上基板之上表 面的第二邊緣上。而黏膠係配置於上述之第一邊緣及第二 邊緣，用以黏合上基板與下基板。 承上所述，本發明所提供之平面光源結構係利用凹槽 結構來容置溢出的黏膠，使得溢出的黏膠不致流入發光腔 内。此外，由於凹槽結構可容置至少部分的黏膠，故上、 下基板間的黏膠厚度可較習知技術為薄，如此可讓阻隔壁 與上基板緊密地封合，使得發光腔體内的汞不致外洩，進 而提升平面光源結構的使用壽命及亮度。另外，在本發明 所提供之平面光源結構中，黏膠僅塗佈於上基板或下基板 的邊緣，而未在阻隔壁上塗佈黏膠，其可達到簡化製程和 撙節黏膠成本的目的。 【實施方式】 本發明係藉由凹槽結構來容置溢出的黏膠，並降低 上下基板間的黏膠厚度，以防止發光腔體内的采外，)¾， 進而提升平面光源結構的使用壽命及亮度。以下將以圖示 及詳細說明清楚說明本發明之精神，如熟悉此技術之人員 在瞭解本發明之較佳實施例後，當可由本發明所教示之技 8 1333582 術，加以改變及修飾，其並不脫離本發明之精神與範圍。 . 參照第丨人圖，其繪示依照本發明一較佳實施例之平面 光源結構的剖面圖。此平面光源結構係由上基板1 1 〇、下基 板120、凹槽結構130及黏膠14〇所構成。其中，下基板 120係面對上基板丨丨〇設置，且此下基板丨2〇具有複數個阻 .· 隔壁〗22。上述之阻隔壁122係與上基板n〇形成複數個發 、 光腔體丨24。凹槽結構130係位於下基板丨20面對上基板 11〇之表面的邊緣上。而黏膠14〇亦配置於上述之表面的 φ 邊緣’用以黏合上基板110與下基板120。 在第1A圖中，上述之黏膠14〇係全部容置於凹槽結構 130中。如此一來，由於上基板11〇與下基板12〇間的黏膠 厚度變薄，故阻隔壁122與上基板11〇間也就沒有空隙， 其可防止發光腔體124内的汞外洩，進而提升平面光源結 構的使用壽命及亮度。 參照第1B圖，其繪示依照本發明另一較佳實施例之平 面光源結構的剖面圖。在第1B圖中，黏膠14〇係部份容置 # 於凹槽結構13〇中，而另一部份之黏膠14〇塗佈於下基板 120面對上基板11〇之表面的邊緣上。更具體地說，凹槽結 構130係可設置於黏膠14〇及發光腔體124之間以容納 • '益出的黏膠140 ’使得溢出的黏膠140不致污染發光腔體。 參照第1C圖，其繪示依照本發明再一較佳實施例之平 面光源結構的剖面圖。在第1C圖中，凹槽結構係可為複數 個凹槽132/134,而黏勝140係部份容置於這些凹槽132/134 中，另一部份之黏膠140則塗佈這些凹槽132/134之間。 如此一來，不但凹槽134可保護發光腔體124不受黏膠Μ。 9 1333582 溢入的污染，且凹槽132更可防止黏膠14〇向外溢出避 免黏膠140硬化後範圍過大，導致組裝不易。 參照第1D-1F圖，其緣示依照本發明數個實施例之下 基板的上視圖。本發明之凹槽結構的數量及排列可有多種 變化，只要其位於下基板面對上基板之表面的邊緣即應屬 - 於本發明的範疇。舉例來說，在本發明之一實施例中的凹 - 槽結構可能是單—槽溝（如第圖所繪示之槽溝136)。此 外，本發明之凹槽結構亦可能為複數個凹槽，而這些凹槽 • 係可以並排的方式順著下基板的邊緣設置（如第1E圖所繪 不之凹槽138);或者這些凹槽亦可以錯排的方式順著下基 板的邊緣設置（如第1F圖所繪示之凹槽138)。 參照第1G-1H圖，其繪示依照本發明數個實施例之下 基板的剖面圖。同樣地，本發明之凹槽結構的剖面形狀亦 可有多種變化。舉例來說，在本發明之一實施例中的凹槽 結構可能是四邊形（如第1G圖所繪示之凹槽結構13〇)，以 利於使用玻璃成形的方式製造；或者，在本發明之另一實 • 施例中的凹槽形狀亦可為弧形（如第1H圖所繪示之凹槽結 構130)，以利於使用喷砂的方式製造。 總而言之，凹槽結構只要位於下基板面對上基板之表 . 自的邊緣，不論其數量、排列及爿面形狀均應符合本發明 之精神，因此皆應包含於本發明之保護範圍之中。而且， 凹槽結構的數量、排列及剖面形狀應視實際情況彈性選擇 其實施方式，而不需受限於以上所舉之實施例。 參照第2A圖，其係繪示依照本發明另一較佳實施例之 平面光源結構的剖面圖。此平面光源結構係由上基板、 10 1333582 下基板220、凹槽結構23〇及黏膠24〇所構成。其中，下基 板220係面對上基板21〇設置，且此下基板22〇具有複數 個阻隔壁222。上述之阻隔壁222係與上基板21〇形成複數 個發光腔體224。凹槽結構230係位於上基板21〇面對下基 板220之表面的邊緣上。而黏膠240則配置於上述之表面 的邊緣’用以黏合上基板21〇與下基板220。 在第2A圖中’上述之黏膠24〇係全部容置於凹槽結構 230中。如此一來，由於上基板21〇與下基板22〇間的黏膠 厚度變薄，故阻隔壁222與上基板210也就沒有空隙，其 可防止發光腔體224内的汞外洩，進而提升平面光源結構 的使用壽命及亮度。 參照第2B圖，其繪示依照本發明再一較佳實施例之平 面光源結構的剖面圖。在第2B圖中，黏膠240係部份容置 於凹槽結構230中，而另一部份之黏膠240塗佈於下基板 220面對上基板210之表面的邊緣上。更具體地說，凹槽結 構230係可設置於黏膠240及發光腔體224之間，以容納 溢出的黏膠240，以避免溢出的黏膠24〇污染發光腔體224。 參照第3 A圖，其係繪示依照本發明又一較佳實施例之 平面光源結構的剖面圖。此平面光源結構係由上基板3丨〇、 下基板320、第一凹槽結構330、第二凹槽結構335及黏膠 340所構成。其中，下基板32〇係面對上基板31〇設置，且 此下基板320具有複數個阻隔壁322。上述之阻隔壁322 係與上基板310形成複數個發光腔體324。第一凹槽結構 330係位於上基板310面對下基板320之下表面的第一邊緣 315上。第二凹槽結構335係位於下基板320面對上基板 11 1333582 31〇之上表面的第二邊緣325上。而黏膠340係配置於上述 之第一邊緣315及第·一邊緣325’用以黏合上基板與下基 板。 在此較佳實施例中，第一邊緣315與第二邊緣325係 分別位於平面光源結構的相對側邊。換言之，第一凹槽結 構330及第二凹槽結構335的位置係可相互對稱排列。此 外’第一凹槽結構330及第二凹槽結構335的大小及形狀 亦可相同。 在第3A圖中’上述之黏膠340黏膠係全部容置於第一 凹槽結構330及第二凹槽結構335中。如此一來，由於上 基板310與下基板320間的黏膠厚度變薄’故阻隔壁322 與上基板310也就沒有空隙，其可防止發光腔體324内的 汞外洩，進而提升平面光源結構的使用壽命及亮度。 參照第3B圖’其繪示依照本發明再一較佳實施例之平 面光源結構的剖面圖。在第3B圖中，黏膠340係部份容置 於第一凹槽結構330及第二凹槽結構335中，而另一部份 之黏膠340則塗佈於上基板3 1 〇及下基板320之間，並鄰 接第一凹槽結構330及第二凹槽結構335。更具體地說，第 一凹槽結構330及第二凹槽結構335係可設置於黏膠34〇 及發光腔體324之間，以容納溢出的黏膠34〇 ,以避免溢出 的黏膠340污染發光腔體324。 由上述本發明較佳實施例可知，應用本發明具有下列 優點。 (1)本發明所提供之平面光源結構係利用凹槽結構來 容置溢出的黏膠，使得溢出的黏膠不致流入發光腔内。 12 1333582 ⑵由於凹槽結構可容置至少部分的黏膠故上下基 板間的黏夥厚度可較習知技術為薄，如此可讓阻隔壁與上 基板能緊密封合，使得發光腔體㈣汞不致㈣，進而提 升平面光源結構的使用壽命及亮度。 (3)另外在本發明所提供之平面光源結構中黏膠僅 塗佈於上基板或下基板的邊緣，而未在阻隔壁上塗佈黏 膠，其可達到簡化製程和撙節黏膠成本的目的。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限疋本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍内，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。 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易僅，所附圖式之詳細說明如下： 第1 A- 1C圖係繪示依照本發明數個較佳實施例之平面 光源結構的剖面圖。 第1D-1F圖係繪示依照本發明數個實施例之下基板的 上視圖。 第1G-1H圖係繪示依照本發明數個實施例之下基板的 剖面圖。 第2 A-2B圖係繪示依照本發明另數個實施例之平面光 源結構的一種剖面圖。 第3 A-3B圖係繪示依照本發明再數個較佳實施例之平 13 1333582 面光源結構的一種剖面圖。 【主要元件符號說明】 110 :上基板 120 :下基板 122 :阻隔壁 124 :發光腔體 130 :凹槽結構 132 :凹槽 134 :凹槽 136 :槽溝 138 :凹槽 140 :黏膠 210 :上基板 220 :下基板 222 :阻隔壁 224 :發光腔體 230 :凹槽結構 240 :黏膠 310 :上基板 3 15 :第一邊緣 320 :下基板 322 :阻隔壁 324 :發光腔體 325 :第二邊緣 330 :第一凹槽結構 335 :第二凹槽結構 340 :黏膠1333582 IX. Description of the Invention: [Technical Field] The present invention relates to a lighting device, and more particularly to a planar light source structure. .. [Prior Art] • The planar light source structure is the basic part of the liquid crystal display (LCD). The main function of the planar light source structure is to provide sufficient light and a well-distributed light source to enable the liquid crystal display to display images. As usual. The structure of the planar light source is usually composed of an upper substrate and a lower substrate. Wherein, the substrate is disposed facing the upper substrate, and the lower substrate has a plurality of barrier walls and the upper substrate forms a plurality of light-emitting cavities. These light-emitting cavities have a phosphor layer and a discharge gas (for example, argon-helium, antimony or mercury) inside to emit light after being energized. In the manufacture of the planar light source structure, the sealing between the upper and lower substrates is achieved by coating the surface of the barrier wall. However, in order to uniformly apply the adhesive, the barrier wall usually has a special structure or distribution (for example, using screen printing technology to screen the adhesive) to prevent the adhesive from overflowing into the light-emitting cavity, but such a complicated technology. However, the difficulty of the process has been greatly improved. Although other process improvements have been made, for example, an adhesive is applied to the edge of the substrate to the edge of the surface of the upper substrate for sealing. In this method, the adhesive is not applied to the barrier wall, but the weight of the upper and lower substrates is used to make the partition wall closely adhere to the upper substrate. However, in practice, the application of this method is often caused by the thickness of the adhesive being too thick, which results in a gap of 1333582 between the upper surface of the barrier wall and the upper substrate. Therefore, after starting the planar light source structure, the plasma will pass through the barrier wall and the upper substrate. The gap between them makes it difficult to illuminate the light-emitting cavity. In addition, since the upper surface of the barrier wall has a gap with the upper substrate, the encapsulation originally enclosed in the illumination chamber H will infiltrate the wipe, resulting in a rapid decline in service life and brightness. Therefore, the method of how to simplify the sealing process of the upper and lower substrates of the planar light source structure and tightly sealing the upper surface of the barrier ribs and the upper substrate is the maker, the seller and the user of the liquid crystal display related industries. Looking forward to it. SUMMARY OF THE INVENTION Accordingly, an aspect of the present invention is to provide a planar light source structure that reduces the thickness of a glue by a groove structure, thereby allowing the barrier wall to be tightly sealed with the upper substrate, thereby making the life of the planar light source structure and The brightness rises and at the same time simplifies the sealing process. According to a preferred embodiment of the present invention, the planar light source structure is composed of an upper substrate, a lower substrate, a recess structure, and an adhesive. Wherein, the lower substrate is disposed opposite the upper substrate and the lower substrate has a plurality of barrier walls. The barrier layer and the upper substrate form a plurality of light-emitting cavities. The groove structure is located on the edge of the lower substrate facing the surface of the upper jaw. The bonding layer is also disposed on the edge of the surface to bond the upper substrate and the lower substrate. According to another preferred embodiment of the present invention, the planar light source structure is composed of an upper substrate, a lower substrate, a groove structure, and an adhesive. Wherein, the lower substrate is disposed facing the upper substrate, and the lower substrate has a plurality of barrier walls. The barrier wall and the upper substrate form a plurality of light-emitting cavities. The groove structure is located on the edge of the surface of the upper substrate facing the lower substrate. The adhesive is also disposed on the edge of the surface of the above 7 1333582 for bonding the upper substrate and the lower substrate. According to still another preferred embodiment of the present invention, the planar light source structure is composed of an upper substrate, a lower substrate, a first groove structure, a second groove structure, and an adhesive. Wherein, the lower substrate is disposed facing the upper substrate, and the lower substrate has a plurality of barrier walls. The barrier wall and the upper substrate form a plurality of light-emitting cavities. The first recess structure is located on a first edge of the upper substrate facing the lower surface of the lower substrate. The second recess structure is located on a second edge of the lower substrate facing the upper surface of the upper substrate. The adhesive is disposed on the first edge and the second edge to bond the upper substrate and the lower substrate. As described above, the planar light source structure provided by the present invention utilizes a recessed structure to accommodate the overflowed adhesive so that the spilled adhesive does not flow into the light-emitting cavity. In addition, since the groove structure can accommodate at least part of the adhesive, the thickness of the adhesive between the upper and lower substrates can be thinner than the prior art, so that the barrier wall and the upper substrate are tightly sealed, so that the light-emitting cavity The mercury inside does not leak, thereby improving the service life and brightness of the planar light source structure. In addition, in the planar light source structure provided by the present invention, the adhesive is applied only to the edge of the upper substrate or the lower substrate, and the adhesive is not coated on the barrier wall, which can achieve the purpose of simplifying the process and the cost of the adhesive. . [Embodiment] The present invention accommodates overflowing adhesive by a groove structure, and reduces the thickness of the adhesive between the upper and lower substrates to prevent the use of the light-emitting cavity, thereby enhancing the use of the planar light source structure. Life and brightness. The spirit and scope of the present invention will be apparent from the following description of the preferred embodiments of the present invention, which can be modified and modified by the teachings of the present invention. The spirit and scope of the invention are not departed. Referring to a third figure, a cross-sectional view of a planar light source structure in accordance with a preferred embodiment of the present invention is shown. The planar light source structure is composed of an upper substrate 1 1 〇, a lower substrate 120, a recess structure 130, and an adhesive 14 。. Wherein, the lower substrate 120 is disposed facing the upper substrate, and the lower substrate 丨2〇 has a plurality of barriers. The barrier wall 122 described above forms a plurality of hair and cavity portions 24 with the upper substrate n. The groove structure 130 is located on the edge of the surface of the lower substrate 20 facing the upper substrate 11A. The adhesive 14 is also disposed on the φ edge of the surface to bond the upper substrate 110 and the lower substrate 120. In Fig. 1A, the above-mentioned adhesive 14 is entirely accommodated in the groove structure 130. As a result, since the thickness of the adhesive between the upper substrate 11 and the lower substrate 12 is thin, there is no gap between the barrier 122 and the upper substrate 11 , which prevents the mercury in the light-emitting cavity 124 from leaking out. Thereby improving the service life and brightness of the planar light source structure. Referring to Figure 1B, a cross-sectional view of a planar light source structure in accordance with another preferred embodiment of the present invention is shown. In Fig. 1B, the adhesive 14 is partially accommodated in the groove structure 13A, and the other portion of the adhesive 14 is applied to the edge of the lower substrate 120 facing the surface of the upper substrate 11 on. More specifically, the groove structure 130 can be disposed between the adhesive 14 and the light-emitting cavity 124 to accommodate the 'extended adhesive 140' such that the spilled adhesive 140 does not contaminate the light-emitting cavity. Referring to Figure 1C, a cross-sectional view of a planar light source structure in accordance with still another preferred embodiment of the present invention is shown. In Fig. 1C, the groove structure may be a plurality of grooves 132/134, and the adhesive 140 system portion is accommodated in the grooves 132/134, and the other portion of the adhesive 140 is coated with these. Between the grooves 132/134. In this way, not only the groove 134 can protect the light-emitting cavity 124 from the glue. 9 1333582 Intrusion of the contamination, and the groove 132 can prevent the adhesive 14 from spilling out to avoid the excessive range of the adhesive 140 after hardening, resulting in assembly is not easy. Referring to Figures 1D-1F, there is a top view of the substrate in accordance with several embodiments of the present invention. The number and arrangement of the groove structures of the present invention may vary in many ways as long as it is located at the edge of the lower substrate facing the surface of the upper substrate - in the scope of the present invention. For example, the concave-groove structure in one embodiment of the invention may be a single-groove (such as the groove 136 depicted in the figures). In addition, the groove structure of the present invention may also be a plurality of grooves, and the grooves may be arranged side by side along the edge of the lower substrate (such as the groove 138 not depicted in FIG. 1E); or The grooves may also be arranged in a staggered manner along the edge of the lower substrate (such as the groove 138 shown in FIG. 1F). Referring to Figures 1G-1H, there are shown cross-sectional views of a substrate in accordance with several embodiments of the present invention. Similarly, the cross-sectional shape of the groove structure of the present invention can be varied. For example, the groove structure in one embodiment of the present invention may be quadrangular (such as the groove structure 13〇 shown in FIG. 1G) to facilitate fabrication using glass forming; or, in the present invention The shape of the groove in the other embodiment may also be curved (such as the groove structure 130 shown in Fig. 1H) to facilitate the manufacture by sand blasting. In summary, the groove structure is located in the surface of the lower substrate facing the upper substrate. The edges, regardless of the number, arrangement and shape of the face, are in accordance with the spirit of the present invention and should therefore be included in the scope of the present invention. Moreover, the number, arrangement and cross-sectional shape of the groove structure should be flexibly selected depending on the actual situation, and need not be limited to the above embodiments. Referring to Figure 2A, there is shown a cross-sectional view of a planar light source structure in accordance with another preferred embodiment of the present invention. The planar light source structure is composed of an upper substrate, a 10 1333582 lower substrate 220, a groove structure 23〇, and an adhesive 24〇. The lower substrate 220 is disposed facing the upper substrate 21, and the lower substrate 22 has a plurality of barrier walls 222. The barrier 222 described above forms a plurality of light-emitting cavities 224 with the upper substrate 21A. The groove structure 230 is located on the edge of the surface of the upper substrate 21 facing the lower substrate 220. The adhesive 240 is disposed on the edge of the surface to bond the upper substrate 21 and the lower substrate 220. In the Fig. 2A, the above-mentioned adhesive 24 is entirely accommodated in the groove structure 230. As a result, since the thickness of the adhesive between the upper substrate 21 and the lower substrate 22 is thin, the barrier 222 and the upper substrate 210 have no gap, which prevents the mercury in the light-emitting cavity 224 from leaking out, thereby improving The service life and brightness of the planar light source structure. Referring to Figure 2B, a cross-sectional view of a planar light source structure in accordance with still another preferred embodiment of the present invention is shown. In Fig. 2B, the adhesive 240 is partially housed in the recess structure 230, and the other portion of the adhesive 240 is applied to the edge of the lower substrate 220 facing the surface of the upper substrate 210. More specifically, the recess structure 230 can be disposed between the adhesive 240 and the illumination cavity 224 to accommodate the spilled adhesive 240 to prevent the spilled adhesive 24 from contaminating the illumination cavity 224. Referring to Figure 3A, there is shown a cross-sectional view of a planar light source structure in accordance with yet another preferred embodiment of the present invention. The planar light source structure is composed of an upper substrate 3, a lower substrate 320, a first recess structure 330, a second recess structure 335, and an adhesive 340. The lower substrate 32 is disposed facing the upper substrate 31, and the lower substrate 320 has a plurality of barrier walls 322. The barrier 322 described above forms a plurality of light-emitting cavities 324 with the upper substrate 310. The first groove structure 330 is located on the first edge 315 of the upper substrate 310 facing the lower surface of the lower substrate 320. The second groove structure 335 is located on the second edge 325 of the upper substrate 320 facing the upper surface of the upper substrate 11 1333582 31 . The adhesive 340 is disposed on the first edge 315 and the first edge 325' to bond the upper substrate and the lower substrate. In the preferred embodiment, the first edge 315 and the second edge 325 are respectively located on opposite sides of the planar light source structure. In other words, the positions of the first groove structure 330 and the second groove structure 335 are symmetrical to each other. Further, the size and shape of the first groove structure 330 and the second groove structure 335 may be the same. In the 3A, the above-mentioned adhesive 340 adhesive is entirely accommodated in the first groove structure 330 and the second groove structure 335. As a result, since the thickness of the adhesive between the upper substrate 310 and the lower substrate 320 is thinned, the barrier 322 and the upper substrate 310 have no gap, which prevents the mercury in the light-emitting cavity 324 from leaking out, thereby enhancing the planar light source. The service life and brightness of the structure. Referring to Figure 3B, a cross-sectional view of a planar light source structure in accordance with still another preferred embodiment of the present invention is shown. In FIG. 3B, the adhesive 340 is partially accommodated in the first groove structure 330 and the second groove structure 335, and the other portion of the adhesive 340 is applied to the upper substrate 3 1 and below. Between the substrates 320, and adjacent to the first groove structure 330 and the second groove structure 335. More specifically, the first groove structure 330 and the second groove structure 335 can be disposed between the adhesive 34〇 and the light emitting cavity 324 to accommodate the overflowed adhesive 34〇 to avoid overflowing the adhesive 340. The illumination cavity 324 is contaminated. It will be apparent from the above-described preferred embodiments of the present invention that the application of the present invention has the following advantages. (1) The planar light source structure provided by the present invention utilizes a groove structure to accommodate the overflowed glue so that the overflowed glue does not flow into the light-emitting cavity. 12 1333582 (2) Since the groove structure can accommodate at least part of the glue, the thickness of the bond between the upper and lower substrates can be thinner than the conventional technology, so that the barrier wall and the upper substrate can be tightly sealed, so that the light-emitting cavity (four) mercury Not to (4), thereby improving the service life and brightness of the planar light source structure. (3) In addition, in the planar light source structure provided by the present invention, the adhesive is applied only to the edge of the upper substrate or the lower substrate, and the adhesive is not coated on the barrier wall, which can simplify the process and the cost of the adhesive. purpose. While the invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more apparent. A cross-sectional view of a planar light source structure of a preferred embodiment. 1D-1F is a top view of a substrate in accordance with several embodiments of the present invention. The 1G-1H diagram depicts a cross-sectional view of a substrate in accordance with several embodiments of the present invention. 2A-2B is a cross-sectional view showing a planar light source structure in accordance with still other embodiments of the present invention. 3A-3B is a cross-sectional view showing the structure of a flat surface light source according to still another preferred embodiment of the present invention. [Main component symbol description] 110: Upper substrate 120: Lower substrate 122: Barrier wall 124: Light-emitting cavity 130: Groove structure 132: Groove 134: Groove 136: Groove 138: Groove 140: Adhesive 210: Upper substrate 220: lower substrate 222: barrier wall 224: light-emitting cavity 230: groove structure 240: adhesive 310: upper substrate 3 15: first edge 320: lower substrate 322: barrier wall 324: light-emitting cavity 325: Two edges 330: first groove structure 335: second groove structure 340: adhesive