TW202211277A

TW202211277A - Backlight module and luminant keyboard thereof

Info

Publication number: TW202211277A
Application number: TW109130815A
Authority: TW
Inventors: 黃恒儀
Original assignee: 達方電子股份有限公司
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2022-03-16

Abstract

An illuminant keyboard includes plural keyswitches and a backlight module disposed thereunder. The keyswitches include a color-cast keyswitch. The backlight module includes a light guide plate, at least one chromatic LED set, a light-attenuating structure and a second optical medium. The light guide plate is made of a first optical medium. The chromatic LED set includes plural LEDs of multiple colors, among which a first LED is configured closest to the color-cast keyswitch. The second optical medium has a refraction index smaller than that of the first optical medium. The second optical medium is disposed between the chromatic LED set and a light-entrance surface of the light guide plate. The light-attenuating structure is disposed between the first LED and the color-cast keyswitch to attenuate a first color light of the first LED that passes through or passes by the light attenuating structure.

Description

背光模組及其發光鍵盤Backlight module and illuminated keyboard

本發明關於一種背光模組及其發光鍵盤，尤指一種使用光衰減結構以改善按鍵發光色偏問題的背光模組及其發光鍵盤。The present invention relates to a backlight module and a light-emitting keyboard, in particular to a backlight module and a light-emitting keyboard that use a light attenuation structure to improve the color shift problem of key light emission.

一般而言，為了使鍵盤具有按鍵發光功能，目前常見的設計係直接在鍵盤之複數按鍵下方配置具有發光二極體的背光模組，發光二極體之光線係可入射至背光模組之導光板，最終出射至每顆按鍵之鍵帽，以產生按鍵發光效果。Generally speaking, in order to make the keyboard have the function of key light-emitting, the current common design is to arrange a backlight module with light-emitting diodes directly under the plurality of keys of the keyboard, and the light of the light-emitting diodes can be incident on the guide of the backlight module. The light plate is finally emitted to the keycap of each key to produce a key light-emitting effect.

在先前技術中，鍵盤上的彩色發光效果，是採用多組多色光源組（如紅綠藍發光二極體（RGB LED））的混光設計，來使鍵帽周緣或鍵帽上之識別符號的發光顏色符合需求。多組多色光源組通常設置在鍵盤的某側或中間區段，其數量、角度、分佈需要讓鍵盤上的每顆按鍵，具有高度的均一性。In the prior art, the color light-emitting effect on the keyboard is a light-mixing design of multiple sets of multi-color light sources (such as red, green and blue light-emitting diodes (RGB LED)), so that the keycap periphery or the keycap can be identified. The luminous color of the symbol meets the requirements. Multiple sets of multi-color light source groups are usually arranged on a certain side or middle section of the keyboard, and the number, angle and distribution of the light source groups need to make each key on the keyboard highly uniform.

然而，由於多色光源組不論設置在何處，每個單色光源到每顆按鍵出光處的距離不盡相同，使得特定按鍵會受到較多最接近的單色光源影響而造成混光比例偏差，導致特定按鍵與周圍按鍵發光顏色不同，也就是所謂異色按鍵的問題。However, no matter where the multi-color light source group is installed, the distance from each monochromatic light source to the light-emitting point of each key is not the same, so that certain keys will be affected by more closest monochromatic light sources, resulting in a deviation in the mixing ratio. , resulting in a different light-emitting color between specific keys and surrounding keys, which is the so-called problem of different-colored keys.

異色按鍵之發光顏色，會偏向最接近之單色光源所發出之色光顏色。例如，當鍵盤整體要統一發白光時，若最接近異色按鍵者為多色光源組的紅色光源，則異色按鍵上所呈現的白光容易出現偏紅色的混光偏差，影響發光鍵盤的視覺效果以及引發品質疑慮。The light-emitting color of the different-color keys will be biased toward the color light emitted by the closest monochromatic light source. For example, when the keyboard as a whole needs to emit white light uniformly, if the red light source of the multi-color light source group is the closest to the different-color keys, the white light presented on the different-color keys is prone to a reddish light mixing deviation, which affects the visual effect of the illuminated keyboard and Caused product doubts.

因此，本發明的目的之一在於提供一種使用光衰減結構以改善按鍵發光色偏問題的發光鍵盤及其背光模組，以解決上述問題。Therefore, one of the objectives of the present invention is to provide a light-emitting keyboard and a backlight module thereof that use a light-attenuating structure to improve the color shift problem of key light emission, so as to solve the above-mentioned problems.

根據一實施例，本發明之背光模組用來設置於一發光鍵盤之複數個按鍵下，該些按鍵其中之一為一異色按鍵，該異色按鍵之鍵帽定義一出光區，該背光模組包含一導光板、至少一多色光源組、至少一第二光介質，以及一光衰減結構。該導光板具有一底面、一入光面以及一出光面，該底面與該入光面鄰接且與該出光面相對，該導光板由一第一光介質構成。該多色光源組對應該導光板之該入光面設置，該多色光源組包含複數個光源，該複數個光源產生彼此相異的複數個色光，該複數個光源之一第一光源位於該多色光源組的第一側且最接近該異色按鍵的該出光區，該複數個光源之一第二光源位於該多色光源組的第二側且最遠離該異色按鍵的該出光區。該第二光介質設置於該多色光源組與該導光板之該入光面間，該第一光介質之第一折射率大於該第二光介質之第二折射率。該光衰減結構設置於該第一光源與該異色按鍵之間，衰減通過或經過該光衰減結構的該第一光源之一第一色光。該第一色光經由該入光面入射至該導光板內，該第一色光依序經過該第二光介質、該光衰減結構與該導光板，使衰減後之該第一色光與該多色光源組產生的其他該些色光產生混合光線，並從該導光板之該出光面射出以照亮該異色按鍵之該出光區。According to an embodiment, the backlight module of the present invention is used to be disposed under a plurality of keys of a light-emitting keyboard, one of the keys is a key with different colors, the keycap of the key with different colors defines a light emitting area, and the backlight module It includes a light guide plate, at least one multicolor light source group, at least one second optical medium, and a light attenuation structure. The light guide plate has a bottom surface, a light incident surface and a light exit surface, the bottom surface is adjacent to the light incident surface and opposite to the light exit surface, and the light guide plate is composed of a first optical medium. The multi-color light source group is disposed corresponding to the light incident surface of the light guide plate, the multi-color light source group includes a plurality of light sources, the plurality of light sources generate a plurality of color lights that are different from each other, and a first light source of the plurality of light sources is located in the The first side of the multi-color light source group is closest to the light-emitting area of the different-color button, and a second light source of the plurality of light sources is located on the second side of the multi-color light source group and farthest from the light-emitting area of the different-color button. The second optical medium is disposed between the multi-color light source group and the light incident surface of the light guide plate, and the first refractive index of the first optical medium is greater than the second refractive index of the second optical medium. The light attenuation structure is disposed between the first light source and the different-color key, and attenuates a first color light of the first light source that passes through or passes through the light attenuation structure. The first color light is incident into the light guide plate through the light incident surface, and the first color light passes through the second optical medium, the light attenuation structure and the light guide plate in sequence, so that the attenuated first color light and The other color lights generated by the multi-color light source group generate mixed light, and are emitted from the light emitting surface of the light guide plate to illuminate the light emitting area of the different-color key.

根據另一實施例，本發明之發光鍵盤包含上述之背光模組以及該複數個按鍵。According to another embodiment, the light-emitting keyboard of the present invention includes the above-mentioned backlight module and the plurality of keys.

綜上所述，由於本發明係採用在多色光源組中最接近異色按鍵之出光區的第一光源與導光板之入光面之間，配置具有其折射率小於導光板之折射率的第二光介質以及光衰減結構的設計，因此，本發明即可針對最接近異色按鍵之出光區的第一光源所發出之第一色光進行光衰減，藉以有效地解決在先前技術中所提到的按鍵發光顏色偏向最接近按鍵之光源之色光顏色的色差問題，從而大大地改善發光鍵盤的按鍵發光效果以及使用觀感。To sum up, because the present invention adopts a second light source whose refractive index is smaller than that of the light guide plate between the first light source in the multi-color light source group that is closest to the light-emitting area of the different-color keys and the light-incident surface of the light guide plate. The design of the two optical media and the light attenuation structure, therefore, the present invention can perform light attenuation for the first color light emitted by the first light source closest to the light emitting area of the different-color keys, thereby effectively solving the problems mentioned in the prior art. The luminous color of the keys is biased towards the chromatic aberration of the color light color of the light source closest to the keys, thereby greatly improving the luminous effect of the keys of the illuminated keyboard and the look and feel of use.

關於本發明之優點與精神可以藉由以下的發明詳述及所附圖式得到進一步的瞭解。The advantages and spirit of the present invention can be further understood from the following detailed description of the invention and the accompanying drawings.

請參閱第1A/1B圖以及第2A/2B圖，第1A圖為根據本發明第一實施例之發光鍵盤10之俯視示意圖，第1B圖為根據本發明之第一實施例所提出之發光鍵盤10之部分剖面示意圖，第2A圖為第1圖之發光鍵盤10之部分放大上視簡示圖，第2B圖為第2A圖之局部放大圖，其中為了清楚地顯示發光鍵盤10之一背光模組14的設計，在第2A圖中僅顯示發光鍵盤10之一異色按鍵16以及背光模組14。如第1A/1B圖以及第2A/2B圖所示，發光鍵盤10包含複數個按鍵12以及背光模組14。複數個按鍵12係位於背光模組14上方，以供使用者按壓而執行使用者所欲輸入之功能，複數個按鍵12之其中之一可為背光模組14所欲照亮之異色按鍵16，異色按鍵16之一鍵帽17定義一出光區19（於第2A圖中以虛線簡示，其出光區19設計（如按鍵字符等）之相關描述係常見於先前技術中，於此不再贅述），藉以允許背光模組14所提供之光線射出而產生按鍵發光效果。在各種不同實施例中，發光鍵盤10上各個按鍵12的鍵帽17所定義的出光區19，可以包含每顆鍵帽17輪廓範圍內的任何一處或多處、鍵帽17的輪廓週圍，或者是相鄰的任意2顆或多顆鍵帽19之間所定義的間隔區域。Please refer to FIGS. 1A/1B and 2A/2B. FIG. 1A is a schematic top view of the light-emitting keyboard 10 according to the first embodiment of the present invention, and FIG. 1B is the light-emitting keyboard according to the first embodiment of the present invention. 10 is a partial cross-sectional schematic view, FIG. 2A is a partial enlarged top view schematic view of the illuminated keyboard 10 of FIG. 1, and FIG. 2B is a partial enlarged view of FIG. As for the design of the group 14, only one of the colored keys 16 of the light-emitting keyboard 10 and the backlight module 14 are shown in FIG. 2A. As shown in FIGS. 1A/1B and 2A/2B, the illuminated keyboard 10 includes a plurality of keys 12 and a backlight module 14 . The plurality of buttons 12 are located above the backlight module 14 for the user to press to execute the function that the user wants to input. One of the plurality of buttons 12 can be a different-color button 16 that the backlight module 14 wants to illuminate. A keycap 17 of the different-colored keys 16 defines a light-emitting area 19 (shown by a dotted line in FIG. 2A , the design of the light-emitting area 19 (such as key characters, etc.) is common in the prior art, and will not be repeated here. ), so as to allow the light provided by the backlight module 14 to be emitted to produce a key light-emitting effect. In various embodiments, the light emitting area 19 defined by the keycap 17 of each key 12 on the luminous keyboard 10 may include any one or more places within the outline of each keycap 17, around the outline of the keycap 17, Or an interval area defined between any two or more adjacent keycaps 19 .

每個按鍵12包含鍵帽17、底板、連接鍵帽17與底板的支撐結構(如一對剪刀腳支架) ，以及位於薄膜電路板上的開關電路，薄膜電路板可位於底板上或底板下。對應出光區19或按鍵12的其他透光區，底板與薄膜電路板具有破孔H以便透光。Each key 12 includes a keycap 17, a bottom plate, a support structure (eg, a pair of scissor foot brackets) connecting the keycap 17 and the bottom plate, and a switch circuit on a thin film circuit board, which can be located on or under the bottom plate. Corresponding to the light-emitting area 19 or other light-transmitting areas of the key 12, the bottom plate and the thin-film circuit board have holes H for light transmission.

以下係針對第一實施例背光模組14之設計進行詳細之描述，由第1A/1B圖以及第2A/2B圖可知，背光模組14係設置於複數個按鍵12下且包含一導光板18、至少一多色光源組20（較佳地為紅綠藍三個單色發光二極體且於第2A/2B圖中顯示一個，但不受此限）、至少一第二光介質22（較佳地為空氣，但不受此限），以及一光衰減結構24。導光板18具有一底面26、一入光面28以及一出光面30，底面26與入光面28鄰接且與出光面30相對，導光板18係可較佳地由第一光介質（如聚碳酸酯（polycarbonate, PC）、聚甲基丙烯酸甲酯（polymethyl methacrylate）, PMMA）等透光塑膠材質，但不受此限）構成。如有需要，導光板18可能設置遮光片於導光板18之出光面30(如頂面)，並設置反射片在導光板18之底面26。一般而言，光線由入光面28進入導光板18後，會在導光板18中進行全反射，直到遇到導光板18的反射結構(圖未示)才向上反射光線，由出光面30出光。The following is a detailed description of the design of the backlight module 14 of the first embodiment. It can be seen from FIGS. 1A/1B and 2A/2B that the backlight module 14 is disposed under the plurality of buttons 12 and includes a light guide plate 18 , at least one polychromatic light source group 20 (preferably three monochromatic light-emitting diodes of red, green and blue and one is shown in Figures 2A/2B, but not limited thereto), at least one second optical medium 22 ( Air is preferred, but not limited thereto), and a light attenuation structure 24 . The light guide plate 18 has a bottom surface 26 , a light incident surface 28 and a light exit surface 30 . The bottom surface 26 is adjacent to the light incident surface 28 and opposite to the light exit surface 30 . Carbonate (polycarbonate, PC), polymethyl methacrylate (polymethyl methacrylate, PMMA) and other light-transmitting plastic materials, but not limited). If necessary, the light guide plate 18 may be provided with a light shielding sheet on the light exit surface 30 (eg, the top surface) of the light guide plate 18 , and a reflection sheet may be provided on the bottom surface 26 of the light guide plate 18 . Generally speaking, after the light enters the light guide plate 18 from the light incident surface 28, it will be totally reflected in the light guide plate 18, and the light will not be reflected upward until it encounters the reflective structure (not shown) of the light guide plate 18, and the light will be emitted from the light exit surface 30. .

多色光源組20對應導光板18之入光面28設置，且多色光源組20較佳地容置於導光板18之開孔中（但不受此限，其亦可採用設置於導光板18之一側的設計），多色光源組20包含在一軟性電路板F1（於第1A圖中以虛線方框簡示）上設置的複數個光源，這些複數個光源可為單獨封裝的多個單色LED晶片、或一體封裝的三個單色LED磊晶。複數個光源產生彼此相異的複數個色光(例如紅綠藍等三色光)，其中複數個光源之一第一光源32靠近多色光源組20的一第一側S1且最接近異色按鍵16的出光區19，複數個光源之一第二光源34靠近多色光源組20的一第二側S2且最遠離異色按鍵16的出光區19。第二光介質22係設置於多色光源組20與導光板18之入光面28之間，在此實施例中，導光板18之第一光介質之第一折射率大於第二光介質22之第二折射率。The multi-color light source group 20 is disposed corresponding to the light incident surface 28 of the light guide plate 18, and the multi-color light source group 20 is preferably accommodated in the opening of the light guide plate 18 (but not limited to this, it can also be disposed on the light guide plate 18), the multi-color light source group 20 includes a plurality of light sources arranged on a flexible circuit board F1 (shown as a dashed box in FIG. 1A ), and these plurality of light sources may be individually packaged multiple light sources. A single-color LED chip, or three single-color LED epitaxy packaged in one piece. The plurality of light sources generate a plurality of color lights (such as red, green, and blue) that are different from each other, wherein a first light source 32 of the plurality of light sources is close to a first side S1 of the multi-color light source group 20 and is closest to the different-color buttons 16. In the light emitting area 19 , a second light source 34 of the plurality of light sources is close to a second side S2 of the multi-color light source group 20 and farthest away from the light emitting area 19 of the different-color keys 16 . The second optical medium 22 is disposed between the multi-color light source group 20 and the light incident surface 28 of the light guide plate 18 . In this embodiment, the first refractive index of the first optical medium of the light guide plate 18 is greater than that of the second optical medium 22 the second refractive index.

光衰減結構24係可較佳地採用從入光面28在對應第一光源32之位置往遠離第一光源32之方向內縮形成的設計，舉例來說，如第1A/1B圖以及第2A/2B圖所示，光衰減結構24係設置於第一光源32與異色按鍵16之間，以衰減通過光衰減結構24之第一光源32的第一色光。更詳細地說，在此實施例中，導光板18之入光面28可具有一第一入光段36靠近第一光源32，並具有一第二入光段38靠近第二光源34（由第2A/2B圖可知，第二光源34至第二入光段38之第二距離係小於第一光源32至第一入光段36之第一距離），第一入光段36與第二入光段38及多色光源組20的排列方向約略為平行，且光衰減結構24係設置於第二光介質22與入光面28的第一入光段36之間。本發明中，光衰減結構24係可由具有第三折射率的第三光介質所組成；在本實施例中，第三光介質較佳地為空氣，亦即第三折射率等於第二光介質22之第二折射率，且光衰減結構24的範圍係可由入光面28的第一入光段36朝鍵帽17之出光區19之方向內縮的局部壁面，以及未內縮前的第二入光段38之平直延伸線二者共同定義（如第2A/2B圖所示，但不受此限）。雖然本實施例中光衰減結構24與第二光介質22均為空氣，但是第一光源32所發出之第一色光，必須額外通過光衰減結構24而有所衰減耗弱，使得實際經過第一入光段36的第一色光減少。The light-attenuating structure 24 can preferably adopt a design formed by shrinking from the light incident surface 28 at a position corresponding to the first light source 32 to a direction away from the first light source 32, for example, as shown in Figs. 1A/1B and 2A As shown in FIG. /2B, the light attenuation structure 24 is disposed between the first light source 32 and the different-color keys 16 to attenuate the first color light passing through the first light source 32 of the light attenuation structure 24 . More specifically, in this embodiment, the light incident surface 28 of the light guide plate 18 may have a first light incident section 36 close to the first light source 32 and a second light incident section 38 close to the second light source 34 (by 2A/2B, it can be seen that the second distance from the second light source 34 to the second light incident section 38 is smaller than the first distance from the first light source 32 to the first light incident section 36), the first light incident section 36 and the second light incident section 36 The light incident section 38 and the multi-color light source group 20 are arranged in approximately parallel directions, and the light attenuation structure 24 is disposed between the second optical medium 22 and the first light incident section 36 of the light incident surface 28 . In the present invention, the light attenuation structure 24 can be composed of a third optical medium having a third refractive index; in this embodiment, the third optical medium is preferably air, that is, the third refractive index is equal to the second optical medium The second refractive index of 22, and the range of the light attenuation structure 24 is the partial wall surface that can be retracted from the first light incident section 36 of the light incident surface 28 toward the light exit area 19 of the keycap 17, and the first part before it is not retracted. The straight extension lines of the two light incident segments 38 are jointly defined by the two (as shown in Figs. 2A/2B, but not limited thereto). Although the light attenuating structure 24 and the second optical medium 22 are both air in this embodiment, the first color light emitted by the first light source 32 must additionally pass through the light attenuating structure 24 to be attenuated and attenuated, so that it actually passes through the first color light. The first color light in the light incident section 36 is reduced.

透過上述設計，最接近異色按鍵16之出光區19的第一光源32所發出之第一色光係可經由入光面28入射至導光板18內，也就是說，第一色光係可依序經過第二光介質22以及光衰減結構24、入光面28的第一入光段36與導光板18。通過光衰減結構24而出現色光衰減效果，可使衰減後之第一色光與多色光源組20的其他該些色光混合光線時，避免異色、色偏的問題，如此從導光板18之出光面30射出以照亮異色按鍵16之出光區19，從而在異色按鍵16產生與附近位置具有較高均勻度的按鍵發光功效。如此一來，即能有效地解決在先前技術中所提到的按鍵發光顏色偏向最接近按鍵之光源之色光顏色的色差問題，從而大大地改善發光鍵盤的按鍵發光效果以及使用觀感。Through the above design, the first color light system emitted by the first light source 32 closest to the light emitting area 19 of the different-color keys 16 can be incident into the light guide plate 18 through the light incident surface 28, that is, the first color light system can be The light passes through the second optical medium 22 , the light attenuation structure 24 , the first light incident section 36 of the light incident surface 28 and the light guide plate 18 in sequence. The color light attenuation effect occurs through the light attenuation structure 24, so that when the attenuated first color light is mixed with the other color lights of the multi-color light source group 20, the problems of different colors and color shifts are avoided, so that the light emitted from the light guide plate 18 The surface 30 emits light to illuminate the light emitting area 19 of the different-color keys 16 , so that the keys 16 of the different-color keys 16 and nearby positions have a high uniformity of key lighting effects. In this way, it can effectively solve the chromatic aberration problem mentioned in the prior art that the key emission color is biased towards the color light color of the light source closest to the key, thereby greatly improving the key lighting effect and the use look and feel of the illuminated keyboard.

值得一提的是，只要是光衰減結構從入光面在對應第一光源之位置往遠離第一光源之方向內縮形成的結構設計，其均可為本發明所採用，並不以上述實施例所述之階梯狀內縮設計為限。It is worth mentioning that as long as the light-attenuating structure is formed by shrinking from the light incident surface at the position corresponding to the first light source to the direction away from the first light source, it can be adopted in the present invention, and the above-mentioned implementation is not applicable. The stepped indentation design described in the example is limited.

舉例來說，請參閱第3圖，其為根據本發明第二實施例所提出之一發光鍵盤10’之部分放大上視簡示圖，其中為了清楚地顯示發光鍵盤10’之一背光模組14’的設計，在第3圖中僅顯示發光鍵盤10’之異色按鍵16以及背光模組14’。在此實施例與上述實施例中所提到之元件具有相同編號者，其代表具有相同或相似之結構或功能，其相關描述係可參照上述實施例類推，於此不再贅述。在此實施例中，如第3圖所示，發光鍵盤10’包含複數個按鍵（於第3圖中僅顯示異色按鍵16）以及背光模組14’，且背光模組14’包含導光板18、多色光源組20、第二光介質22，以及一光衰減結構24’，在此實施例中，光衰減結構24’係可從導光板18之入光面28在對應第一光源32之位置往遠離第一光源32之方向斜向內縮形成，其中光衰減結構24’係可由具有第三折射率的第三光介質（較佳地為空氣，亦即第三折射率等於第二光介質22之第二折射率）構成，且光衰減結構24’的範圍係可由入光面28的第一入光段36朝鍵帽17之出光區19之方向斜向內縮的局部壁面，以及未內縮前的第二入光段38之平直延伸線二者共同定義（如第3圖所示，但不受此限）。本實施例中，入光面28的第一入光段36，是分別與第二入光段38及多色光源組20排列方向夾有一定角度，而不彼此平行。For example, please refer to FIG. 3 , which is an enlarged schematic top view of a part of a light-emitting keyboard 10 ′ according to the second embodiment of the present invention, wherein a backlight module of the light-emitting keyboard 10 ′ is clearly displayed For the design of 14', in FIG. 3, only the different-color keys 16 and the backlight module 14' of the light-emitting keyboard 10' are shown. Elements mentioned in this embodiment and the above-mentioned embodiments have the same numbers, which represent the same or similar structures or functions. The related descriptions can be inferred with reference to the above-mentioned embodiments, and are not repeated here. In this embodiment, as shown in FIG. 3 , the light-emitting keyboard 10 ′ includes a plurality of keys (only the different-colored keys 16 are shown in FIG. 3 ) and a backlight module 14 ′, and the backlight module 14 ′ includes a light guide plate 18 , the multi-color light source group 20 , the second optical medium 22 , and a light attenuation structure 24 ′. In this embodiment, the light attenuation structure 24 ′ can pass from the light incident surface 28 of the light guide plate 18 to the corresponding first light source 32 . The position is formed by slanting inwards in the direction away from the first light source 32, wherein the light attenuation structure 24' can be formed by a third optical medium with a third refractive index (preferably air, that is, the third refractive index is equal to the second light the second index of refraction of the medium 22 ), and the range of the light attenuation structure 24 ′ can be a partial wall surface obliquely inwardly retracted from the first light incident section 36 of the light incident surface 28 toward the light exit area 19 of the keycap 17 , and The straight extension line of the second light incident segment 38 before retraction is defined jointly by the two (as shown in FIG. 3, but not limited thereto). In this embodiment, the first light incident segment 36 of the light incident surface 28 is at a certain angle with the second light incident segment 38 and the arrangement direction of the multi-color light source group 20 respectively, and is not parallel to each other.

請參閱第4圖，其為根據本發明第三實施例所提出之一發光鍵盤100之部分剖面示意圖，在此實施例與上述實施例中所提到之元件具有相同編號者，其代表具有相同或相似之結構或功能，其相關描述係可參照上述實施例類推，於此不再贅述。在此實施例中，如第4圖所示，發光鍵盤100包含複數個按鍵12（於第4圖中以兩個簡示，但不以此為限）以及一背光模組102，複數個按鍵12之其中之一為背光模組102所欲照亮之異色按鍵16，背光模組102包含導光板18、多色光源組20、第二光介質22，以及一光衰減結構104，光衰減結構104係可較佳地為光學微結構且形成於出光面30上且鄰近入光面28之位置（但不受此限，本發明亦可採用光學微結構形成於底面26上且鄰近入光面28之位置的設計），如此一來，最接近異色按鍵16之出光區19的第一光源32所發出之第一色光係可依序通過第二光介質22以及經過(pass by)光衰減結構104與導光板18，從而透過光學微結構之散射以使得第一色光出現光衰減效果，藉以有效地解決在先前技術中所提到的按鍵發光顏色偏向最接近按鍵之光源之色光顏色的色差問題，從而大大地改善發光鍵盤的按鍵發光效果以及使用觀感。Please refer to FIG. 4 , which is a partial cross-sectional schematic diagram of a light-emitting keyboard 100 according to a third embodiment of the present invention. The elements mentioned in this embodiment and the above-mentioned embodiments have the same numbers, which represent the same elements. or similar structures or functions, the related descriptions thereof can be inferred with reference to the above-mentioned embodiments, and will not be repeated here. In this embodiment, as shown in FIG. 4 , the light-emitting keyboard 100 includes a plurality of keys 12 (two are briefly shown in FIG. 4 , but not limited thereto) and a backlight module 102 , a plurality of keys One of 12 is a different-color button 16 to be illuminated by the backlight module 102. The backlight module 102 includes a light guide plate 18, a multi-color light source group 20, a second optical medium 22, and a light attenuation structure 104. The light attenuation structure 104 is preferably an optical microstructure and is formed on the light exit surface 30 and adjacent to the light incident surface 28 (but not limited to this, the present invention can also use an optical microstructure formed on the bottom surface 26 and adjacent to the light incident surface. 28), in this way, the first color light emitted by the first light source 32 closest to the light emitting area 19 of the different-color keys 16 can pass through the second optical medium 22 and pass by light attenuation in sequence. The structure 104 and the light guide plate 18 allow the first color light to have a light attenuation effect through the scattering of the optical microstructure, so as to effectively solve the problem of the color light of the keys being biased toward the color light of the light source closest to the keys mentioned in the prior art. The problem of chromatic aberration is greatly improved, thereby greatly improving the lighting effect of the keys of the illuminated keyboard and the use of the keyboard.

在本發明所有實施例中，第一色光不限於通過(pass through)或穿過(penetrate through)光衰減結構才能達到衰減效果。在第三實施例(第4圖)、第四實施例(第5圖以及第6圖)、第五實施例(第7圖)、第六實施例(第8圖)，第一色光不限於經過(pass by)光衰減結構，也能達到衰減效果In all embodiments of the present invention, the first color light is not limited to pass through or penetrate through the light attenuation structure to achieve attenuation effect. In the third embodiment (FIG. 4), the fourth embodiment (FIGS. 5 and 6), the fifth embodiment (FIG. 7), and the sixth embodiment (FIG. 8), the first color light is not It is limited to pass by the light attenuation structure, and the attenuation effect can also be achieved

在第四實施例中，本發明係可採用以黏膠層產生光衰減功效之設計，舉例來說，請參閱第5圖以及第6圖，第5圖為根據本發明第四實施例所提出之一發光鍵盤150之部分剖面示意圖，第6圖為第5圖之發光鍵盤150之部分放大上視簡示圖，其中為了清楚地顯示發光鍵盤150之一背光模組152的設計，在第6圖中僅顯示發光鍵盤150之異色按鍵16以及背光模組152。在此實施例與上述實施例中所提到之元件具有相同編號者，其代表具有相同或相似之結構或功能，其相關描述係可參照上述實施例類推，於此不再贅述。在此實施例中，如第5圖以及第6圖所示，發光鍵盤150包含複數個按鍵12（於第5圖中以兩個簡示，但不以此為限）以及背光模組152，複數個按鍵12之其中之一為背光模組152所欲照亮之異色按鍵16，背光模組152包含導光板18、多色光源組20、第二光介質22、一遮光片154、一反射片156，以及一光衰減結構158a。遮光片154係設置於導光板18之出光面30上且反射片156設置於導光板18之底面26下，遮光片154可採用具有一覆蓋層160且覆蓋層160定義複數個開口161以分別對應複數個按鍵12之遮光設計，例如遮光片154可由透明材質所組成，其上依序塗佈有白漆與黑漆以形成覆蓋層160，且在分別對應複數個按鍵12之位置形成複數個開口161（即未塗佈黑漆與白漆處）以供透光，但不以此為限。光衰減結構158a係可較佳地為半透光的黏膠層158（如水膠，但不受此限）的一部分、位於第一色光行進路徑上，其折射率大於第二光介質22之第二折射率，黏膠層158黏附於遮光片154與導光板18之出光面30之間以及黏附於反射片156與導光板18之底面26之間，且對應入光面28與第一光源32，同時黏膠層158並未延伸至對應第二光源34（如第6圖所示之無膠區B）。如此一來，最接近異色按鍵16之出光區19的第一光源32所發出之第一色光係可依序經過第二光介質22以及光衰減結構158a與導光板18，由於會有一部分第一色光入射至光衰減結構158a，將因為透過光衰減結構158a及黏膠層158之光學擴散效果，將此部分第一色光引導至其他方向，以使得第一色光出現光衰減效果；相對的，由於第二色光並未被光衰減結構158a衰減，因此到達出光區19時，第二色光與第一色光會有相近的光通量，藉以有效地解決按鍵發光顏色偏向最接近光源色光顏色的問題。In the fourth embodiment, the present invention can adopt the design of using the adhesive layer to produce the light attenuation effect. For example, please refer to FIG. 5 and FIG. 6. FIG. 5 is proposed according to the fourth embodiment of the present invention. A partial cross-sectional schematic diagram of a light-emitting keyboard 150, FIG. 6 is a schematic enlarged top view of a part of the light-emitting keyboard 150 in FIG. Only the different-colored keys 16 and the backlight module 152 of the light-emitting keyboard 150 are shown in the figure. Elements mentioned in this embodiment and the above-mentioned embodiments have the same numbers, which represent the same or similar structures or functions. The related descriptions can be inferred with reference to the above-mentioned embodiments, and are not repeated here. In this embodiment, as shown in FIG. 5 and FIG. 6 , the light-emitting keyboard 150 includes a plurality of keys 12 (two are briefly shown in FIG. 5, but not limited thereto) and a backlight module 152, One of the plurality of buttons 12 is a different-color button 16 to be illuminated by the backlight module 152. The backlight module 152 includes a light guide plate 18, a multi-color light source group 20, a second optical medium 22, a light shielding sheet 154, and a reflector. sheet 156, and a light attenuating structure 158a. The light-shielding sheet 154 is disposed on the light-emitting surface 30 of the light guide plate 18 and the reflection sheet 156 is disposed under the bottom surface 26 of the light-guiding plate 18. The light-shielding sheet 154 may have a cover layer 160 and the cover layer 160 defines a plurality of openings 161 corresponding to The shading design of the plurality of buttons 12, for example, the shading sheet 154 can be composed of a transparent material, on which white paint and black paint are sequentially coated to form the cover layer 160, and a plurality of openings are formed at the positions corresponding to the plurality of buttons 12 respectively. 161 (that is, where black and white paint is not applied) for light transmission, but not limited thereto. The light attenuation structure 158a is preferably a part of the semi-transparent adhesive layer 158 (such as water glue, but not limited thereto), located on the traveling path of the first color light, and its refractive index is greater than that of the second optical medium 22 . The second refractive index, the adhesive layer 158 is adhered between the light shielding sheet 154 and the light exit surface 30 of the light guide plate 18 and between the reflecting sheet 156 and the bottom surface 26 of the light guide plate 18, and corresponds to the light incident surface 28 and the first light source 32, while the adhesive layer 158 does not extend to the corresponding second light source 34 (as shown in the adhesive-free area B in FIG. 6). In this way, the first color light emitted by the first light source 32 closest to the light emitting area 19 of the different-color keys 16 can pass through the second optical medium 22, the light attenuation structure 158a and the light guide plate 18 in sequence. A color light is incident on the light attenuating structure 158a, and due to the optical diffusion effect of the light attenuating structure 158a and the adhesive layer 158, the part of the first color light is guided to other directions, so that the first color light has a light attenuation effect; On the contrary, since the second color light is not attenuated by the light attenuation structure 158a, when it reaches the light exit area 19, the second color light and the first color light will have a similar luminous flux, so as to effectively solve the problem that the key emission color tends to be closest to the color light color of the light source. The problem.

需注意的是，上述在遮光片上配置有黏膠層之光衰減設計以及在反射片上配置有黏膠層之光衰減設計係為可同時設置、或二者擇一之配置，藉以簡化背光模組之結構設計且提升背光模組之配置彈性。It should be noted that the above-mentioned light attenuation design with an adhesive layer on the shading sheet and the light attenuation design with an adhesive layer on the reflective sheet can be configured at the same time or alternatively, so as to simplify the backlight module. The structural design improves the configuration flexibility of the backlight module.

除此之外，本發明係可另採用黏膠層延伸設計以產生光衰減功效，請參閱第7圖，其為根據本發明第五實施例所提出之一發光鍵盤150’之部分放大上視簡示圖，其中為了清楚地顯示發光鍵盤150’之一背光模組152’的設計，在第7圖中僅顯示發光鍵盤150’之異色按鍵16以及背光模組152’。在此實施例與上述實施例中所提到之元件具有相同編號者，其代表具有相同或相似之結構或功能，其相關描述係可參照上述實施例類推，於此不再贅述。在此實施例中，如第7圖所示，發光鍵盤150’包含複數個按鍵（於第7圖中僅顯示異色按鍵16）以及背光模組152’，背光模組152’包含導光板18、多色光源組20、第二光介質22、遮光片154，以及一光衰減結構158b，光衰減結構158b係較佳地為半透光的黏膠層158’（如水膠，但不受此限），其折射率大於第二光介質22之第二折射率，黏膠層158’黏附於遮光片154與導光板18之間，且對應入光面28與第一光源32，黏膠層158’具有一延伸段159沿著第一光源32之第一色光的光傳遞路徑延伸，如此在第一色光的路徑上，黏膠層158’的一部份與延伸段159即能形成光衰減結構158b。由於會有一部分第一色光入射至光衰減結構158b，會因為光衰減結構158b與黏膠層158’的光學擴散效果，將此部分第一色光引導至其他方向，使得第一色光出現光衰減現象；相對的，由於第二色光並未被光衰減結構158b衰減，因此到達出光區19時，第二色光與第一色光會有相近的光通量，藉以有效地解決色偏問題。另外，上述黏膠層延伸設計係可應用在反射片上，其相關描述可參照第7圖類推，於此不再贅述。In addition, the present invention can further adopt the extension design of the adhesive layer to produce the light attenuation effect. Please refer to FIG. 7, which is a partially enlarged top view of a light-emitting keyboard 150' according to the fifth embodiment of the present invention In the schematic diagram, in order to clearly show the design of a backlight module 152' of the light-emitting keyboard 150', only the different-colored keys 16 and the backlight module 152' of the light-emitting keyboard 150' are shown in FIG. 7 . Elements mentioned in this embodiment and the above-mentioned embodiments have the same numbers, which represent the same or similar structures or functions. The related descriptions can be inferred with reference to the above-mentioned embodiments, and are not repeated here. In this embodiment, as shown in FIG. 7 , the light-emitting keyboard 150 ′ includes a plurality of keys (only the different-colored keys 16 are shown in FIG. 7 ) and a backlight module 152 ′. The backlight module 152 ′ includes the light guide plate 18 , The multi-color light source group 20, the second optical medium 22, the light shielding sheet 154, and a light attenuation structure 158b, the light attenuation structure 158b is preferably a semi-transparent adhesive layer 158' (such as water glue, but not limited to this) ), its refractive index is greater than the second refractive index of the second optical medium 22, the adhesive layer 158' is adhered between the light shielding sheet 154 and the light guide plate 18, and corresponds to the light incident surface 28 and the first light source 32, the adhesive layer 158 'Has an extension section 159 extending along the light transmission path of the first color light of the first light source 32, so that on the path of the first color light, a part of the adhesive layer 158' and the extension section 159 can form light Attenuating structure 158b. Since a part of the first color light is incident on the light attenuation structure 158b, the part of the first color light will be guided to other directions due to the optical diffusion effect of the light attenuation structure 158b and the adhesive layer 158', so that the first color light will appear. Light attenuation phenomenon. On the contrary, since the second color light is not attenuated by the light attenuation structure 158b, when reaching the light exit area 19, the second color light and the first color light will have similar luminous flux, thereby effectively solving the color shift problem. In addition, the above-mentioned extension design of the adhesive layer can be applied to the reflective sheet, and the related description can be deduced with reference to FIG. 7 and the like, which will not be repeated here.

在另一實施例中，本發明係可採用以印刷層產生光衰減功效之設計，舉例來說，請參閱第8圖，其為根據本發明第六實施例所提出之一發光鍵盤200之部分放大上視簡示圖，其中為了清楚地顯示發光鍵盤200之一背光模組202的設計，在第8圖中僅顯示發光鍵盤200之異色按鍵16以及背光模組202。在此實施例與上述實施例中所提到之元件具有相同編號者，其代表具有相同或相似之結構或功能，其相關描述係可參照上述實施例類推，於此不再贅述。在此實施例中，如第8圖所示，發光鍵盤200包含複數個按鍵（於第8圖中僅顯示異色按鍵16）以及背光模組202，背光模組202包含導光板18、多色光源組20、第二光介質22、一遮光片204、一反射片207，以及一光衰減結構，遮光片204具有覆蓋層206，覆蓋層206定義複數個開口以分別對應複數個按鍵且可包含一印刷層208以形成該光衰減結構，印刷層208係可位在第一光源32之第一色光相對於異色按鍵16之傳播路徑在遮光片204上之投影位置。其中印刷層208可較佳地為黑色印刷層以產生吸光衰減效果，或者是具有與第二光源34之第二色光相同顏色的印刷層，以產生第一色光衰減、或以第二色光顏色印刷層調整第一色光的顯色效果。如此一來，透過印刷層208之吸光或混光設計，入射至印刷層208上的第一色光不會直接反射回到導光板18，即能解決第一色光的色偏問題。另外，上述印刷層設計係可同時或分別應用在反射片207上，其相關描述可參照第8圖類推，於此不再贅述。In another embodiment, the present invention can adopt the design of producing light attenuation effect with a printed layer. For example, please refer to FIG. 8, which is a part of a light-emitting keyboard 200 according to the sixth embodiment of the present invention The enlarged schematic diagram from above, in order to clearly show the design of a backlight module 202 of the light-emitting keyboard 200 , only the different-colored keys 16 and the backlight module 202 of the light-emitting keyboard 200 are shown in FIG. 8 . Elements mentioned in this embodiment and the above-mentioned embodiments have the same numbers, which represent the same or similar structures or functions. The related descriptions can be inferred with reference to the above-mentioned embodiments, and are not repeated here. In this embodiment, as shown in FIG. 8 , the illuminated keyboard 200 includes a plurality of keys (only the different-colored keys 16 are shown in FIG. 8 ) and a backlight module 202 . The backlight module 202 includes a light guide plate 18 and a multi-color light source. The group 20, the second optical medium 22, a light shielding sheet 204, a reflective sheet 207, and a light attenuation structure, the light shielding sheet 204 has a cover layer 206, the cover layer 206 defines a plurality of openings to correspond to a plurality of buttons respectively and may include a The printing layer 208 is formed to form the light attenuation structure, and the printing layer 208 can be located at the projection position of the first color light of the first light source 32 relative to the propagation path of the different-color keys 16 on the light shielding sheet 204 . The printing layer 208 may preferably be a black printing layer to produce a light absorption attenuation effect, or a printing layer having the same color as the second color light of the second light source 34 to produce a first color light attenuation, or a second color light color. The printing layer adjusts the color rendering effect of the first color light. In this way, through the light absorption or light mixing design of the printing layer 208, the first color light incident on the printing layer 208 will not be directly reflected back to the light guide plate 18, which can solve the color shift problem of the first color light. In addition, the above-mentioned printing layer design can be applied to the reflective sheet 207 simultaneously or separately, and the related description can refer to FIG. 8 and so on, and will not be repeated here.

在本發明上述各實施例所述之異色按鍵16，並不限定為最靠近多色光源組20的各個按鍵12。舉凡多色光源組20的複數光源的光學路徑所能到達之處，只要出現異色問題的按鍵12，均可視為異色按鍵16。例如，第1A圖中某一多色光源組20的複數光源的光學路徑以虛線箭頭表示，其所構成扇形發光涵蓋範圍的每顆按鍵12若有異色問題，即為異色按鍵16。由於一般而言可設置多組多色光源組20來照射各個按鍵12，換言之，整個發光鍵盤10上的所有按鍵12皆可能是異色按鍵16，可運用本發明前述個實施例之技術手段或其組合予以排除。以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。The different-color buttons 16 described in the above embodiments of the present invention are not limited to the buttons 12 closest to the multi-color light source group 20 . For example, wherever the optical paths of the plurality of light sources of the multi-color light source group 20 can reach, as long as the keys 12 with the problem of different colors can be regarded as the keys 16 of different colors. For example, in FIG. 1A , the optical paths of the plurality of light sources of a certain multi-color light source group 20 are indicated by dashed arrows. If each button 12 in the fan-shaped lighting coverage area has a problem of different colors, it is a different color button 16 . Generally speaking, multiple sets of multi-color light sources 20 can be set to illuminate each key 12 , in other words, all keys 12 on the entire illuminated keyboard 10 may be keys 16 of different colors. combinations are excluded. The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

10、10’、100、150、150’、200:發光鍵盤 12:按鍵 14、14’、102、152、152’、202:背光模組 16:異色按鍵 17:鍵帽 18:導光板 19:出光區 20:多色光源組 22:第二光介質 24、24’、104、158a、158b:光衰減結構 26:底面 28:入光面 30:出光面 32:第一光源 34:第二光源 36:第一入光段 38:第二入光段 154、204:遮光片 156、207:反射片 158、158’:黏膠層 159:延伸段 160、206:覆蓋層 161:開口 208:印刷層 B:無膠區 F1:軟性電路板 H:破孔 S1:第一側 S2:第二側10, 10', 100, 150, 150', 200: Illuminated keyboard 12: Button 14, 14', 102, 152, 152', 202: Backlight module 16: Different color buttons 17: Keycaps 18: Light guide plate 19: Light-emitting area 20: Multi-color light source group 22: Second Optical Medium 24, 24', 104, 158a, 158b: light attenuation structures 26: Underside 28: light incident surface 30: light-emitting surface 32: The first light source 34: Second light source 36: The first incident light segment 38: The second incident light segment 154, 204: shading sheet 156, 207: Reflector 158, 158': adhesive layer 159: Extension 160, 206: Overlay 161: Opening 208: Printing layer B: glue-free area F1: Flexible circuit board H: hole S1: first side S2: Second side

第1A圖為根據本發明第一實施例之發光鍵盤之俯視示意圖第1B圖為根據本發明之第一實施例所提出之發光鍵盤之部分剖面示意圖第2A圖為第1A圖之發光鍵盤之部分放大上視簡示圖。第2B圖為第2A圖之局部放大圖。第3圖為根據本發明第二實施例所提出之發光鍵盤之部分放大上視簡示圖。第4圖為根據本發明第三實施例所提出之發光鍵盤之部分剖面示意圖。第5圖為根據本發明第四實施例所提出之發光鍵盤之部分剖面示意圖。第6圖為第5圖之發光鍵盤之部分放大上視簡示圖。第7圖為根據本發明第五實施例所提出之發光鍵盤之部分放大上視簡示圖。第8圖為根據本發明第六實施例所提出之發光鍵盤之部分放大上視簡示圖。FIG. 1A is a schematic top view of the illuminated keyboard according to the first embodiment of the present invention FIG. 1B is a partial cross-sectional view of the light-emitting keyboard according to the first embodiment of the present invention. FIG. 2A is an enlarged schematic top view of a portion of the illuminated keyboard of FIG. 1A. Fig. 2B is a partial enlarged view of Fig. 2A. FIG. 3 is an enlarged schematic top view of a part of the illuminated keyboard according to the second embodiment of the present invention. FIG. 4 is a partial cross-sectional schematic diagram of a light-emitting keyboard according to a third embodiment of the present invention. FIG. 5 is a partial cross-sectional schematic diagram of a light-emitting keyboard according to a fourth embodiment of the present invention. FIG. 6 is an enlarged schematic top view of a part of the illuminated keyboard of FIG. 5 . FIG. 7 is an enlarged schematic top view of a part of the illuminated keyboard according to the fifth embodiment of the present invention. FIG. 8 is an enlarged schematic top view of a part of the illuminated keyboard according to the sixth embodiment of the present invention.

10:發光鍵盤10: Illuminated keyboard

14:背光模組14: Backlight module

16:異色按鍵16: Different color buttons

17:鍵帽17: Keycaps

18:導光板18: Light guide plate

19:出光區19: Light-emitting area

20:多色光源組20: Multi-color light source group

22:第二光介質22: Second Optical Medium

24:光衰減結構24: Light Attenuation Structure

28:入光面28: light incident surface

32:第一光源32: The first light source

34:第二光源34: Second light source

36:第一入光段36: The first incident light segment

38:第二入光段38: The second incident light segment

S1:第一側S1: first side

S2:第二側S2: Second side

Claims

一種背光模組，其用來設置於一發光鍵盤之複數個按鍵下，該些按鍵其中之一為一異色按鍵，該異色按鍵之鍵帽定義一出光區，該背光模組包含：一導光板，其具有一底面、一入光面以及一出光面，該底面與該入光面鄰接且與該出光面相對，該導光板由一第一光介質構成；至少一多色光源組，對應該導光板之該入光面設置，該多色光源組包含複數個光源，該複數個光源產生彼此相異的複數個色光，該複數個光源之一第一光源位於該多色光源組的第一側且最接近該異色按鍵的該出光區，該複數個光源之一第二光源位於該多色光源組的第二側且最遠離該異色按鍵的該出光區；至少一第二光介質，設置於該多色光源組與該導光板之該入光面間，該第一光介質之第一折射率大於該第二光介質之第二折射率；以及一光衰減結構，設置於該第一光源與該異色按鍵之間，衰減通過該光衰減結構的該第一光源之一第一色光；其中，該第一色光經由該入光面入射至該導光板內，該第一色光依序經過該第二光介質、該光衰減結構與該導光板，使衰減後之該第一色光與該多色光源組產生的其他該些色光產生混合光線，並從該導光板之該出光面射出以照亮該異色按鍵之該出光區。A backlight module, which is used to be arranged under a plurality of keys of a light-emitting keyboard, one of the keys is a different-color key, the keycap of the different-color key defines a light-emitting area, and the backlight module comprises: a light guide plate, which has a bottom surface, a light incident surface and a light exit surface, the bottom surface is adjacent to the light incident surface and opposite to the light exit surface, and the light guide plate is composed of a first optical medium; At least one multi-color light source group is disposed corresponding to the light incident surface of the light guide plate, the multi-color light source group includes a plurality of light sources, the plurality of light sources generate a plurality of color lights that are different from each other, and one of the plurality of light sources is a first light source. a second light source of the plurality of light sources is located on the second side of the multi-color light source group and farthest from the light emitting area of the different-color button ; at least one second optical medium disposed between the multi-color light source group and the light incident surface of the light guide plate, the first refractive index of the first optical medium is greater than the second refractive index of the second optical medium; and a light attenuation structure, disposed between the first light source and the different-color key, attenuates a first color light of the first light source passing through the light attenuation structure; Wherein, the first color light is incident into the light guide plate through the light incident surface, and the first color light passes through the second optical medium, the light attenuation structure and the light guide plate in sequence, so that the attenuated first color light is The light and the other colored lights generated by the multi-color light source group generate mixed light, which is emitted from the light emitting surface of the light guide plate to illuminate the light emitting area of the different-color key.

如請求項1所述之背光模組，其中該導光板之該入光面具有一第一入光段靠近該第一光源、並具有一第二入光段靠近該第二光源，該第二光源至該第二入光段之第二距離，小於該第一光源至該第一入光段之第一距離。The backlight module of claim 1, wherein the light incident surface of the light guide plate has a first light incident section close to the first light source, and a second light incident section close to the second light source, and the second light incident section is close to the second light source. The second distance from the light source to the second light incident section is smaller than the first distance from the first light source to the first light incident section.

如請求項2所述之背光模組，其中該光衰減結構設置於該第二光介質與該入光面的該第一入光段之間，該光衰減結構由一第三介質構成，該第三介質具有第三折射率不小於該第二介質的該第二折射率。The backlight module of claim 2, wherein the light attenuation structure is disposed between the second optical medium and the first light incident section of the light incident surface, the light attenuation structure is composed of a third medium, the The third medium has a third refractive index not less than the second refractive index of the second medium.

如請求項1所述之背光模組，其中該光衰減結構係為一光學微結構且形成於該出光面或該底面上且鄰近該入光面之位置。The backlight module of claim 1, wherein the light attenuation structure is an optical microstructure and is formed on the light exit surface or the bottom surface and is adjacent to the light incident surface.

如請求項1所述之背光模組，其中該背光模組另包含一遮光片具有覆蓋層，該遮光片設置於該出光面上，該覆蓋層定義複數個開口分別對應該複數個按鍵；該光衰減結構係為半透光的一黏膠層，該黏膠層黏附於該遮光片與該導光板之間，且對應該入光面與該第一光源，同時該黏膠層並未延伸至對應該第二光源。The backlight module of claim 1, wherein the backlight module further comprises a light-shielding sheet having a cover layer, the light-shielding sheet is disposed on the light-emitting surface, and the cover layer defines a plurality of openings corresponding to the plurality of buttons respectively; the The light attenuation structure is a semi-transparent adhesive layer, the adhesive layer is adhered between the light shielding sheet and the light guide plate, and corresponds to the light incident surface and the first light source, and the adhesive layer does not extend to the corresponding second light source.

如請求項1所述之背光模組，其中該背光模組另包含一反射片，該反射片設置於該底面下；該光衰減結構係為半透光的一黏膠層，該黏膠層黏附於該反射片與該導光板之間，且對應該入光面與該第一光源，同時該黏膠層並未延伸至對應該第二光源。The backlight module of claim 1, wherein the backlight module further comprises a reflection sheet, the reflection sheet is disposed under the bottom surface; the light attenuation structure is a semi-transparent adhesive layer, and the adhesive layer The adhesive layer is adhered between the reflection sheet and the light guide plate, and corresponds to the light incident surface and the first light source, and the adhesive layer does not extend to the second light source.

如請求項1所述之背光模組，其中該背光模組另包含一反射片，該反射片設置於該底面下；該光衰減結構係為半透光的一黏膠層，該黏膠層黏附於該反射片與該導光板之間，對應該入光面與該第一光源，且該黏膠層具有一延伸段沿著該第一光源的該第一色光的光傳遞路徑延伸。The backlight module of claim 1, wherein the backlight module further comprises a reflection sheet, the reflection sheet is disposed under the bottom surface; the light attenuation structure is a semi-transparent adhesive layer, and the adhesive layer The adhesive layer is adhered between the reflective sheet and the light guide plate, corresponding to the light incident surface and the first light source, and the adhesive layer has an extension extending along the light transmission path of the first color light of the first light source.

如請求項1所述之背光模組，其中該背光模組另包含一遮光片具有覆蓋層，該遮光片設置於該出光面上，該覆蓋層定義複數個開口分別對應該複數個按鍵；該光衰減結構係為半透光的一黏膠層，該黏膠層黏附於該遮光片與該導光板之間，對應該入光面與該第一光源，且該黏膠層具有一延伸段沿著該第一光源的該第一色光的光傳遞方向延伸。The backlight module of claim 1, wherein the backlight module further comprises a light-shielding sheet having a cover layer, the light-shielding sheet is disposed on the light-emitting surface, and the cover layer defines a plurality of openings corresponding to the plurality of buttons respectively; the The light attenuation structure is a semi-transparent adhesive layer, the adhesive layer is adhered between the light shielding sheet and the light guide plate, corresponding to the light incident surface and the first light source, and the adhesive layer has an extension section extending along the light transmission direction of the first color light of the first light source.

如請求項1所述之背光模組，其中該背光模組另包含一遮光片具有覆蓋層，該遮光片設置於該出光面上，該覆蓋層定義複數個開口分別對應該複數個按鍵；該覆蓋層包含一印刷層形成該光衰減結構，該印刷層位在該第一光源之該第一色光相對於該按鍵之傳播路徑在該遮光片上之投影位置。The backlight module of claim 1, wherein the backlight module further comprises a light-shielding sheet having a cover layer, the light-shielding sheet is disposed on the light-emitting surface, and the cover layer defines a plurality of openings corresponding to the plurality of buttons respectively; the The cover layer includes a printing layer to form the light attenuation structure, and the printing layer is located at the projection position of the first color light of the first light source relative to the propagation path of the key on the light shielding sheet.

如請求項1所述之背光模組，其中該背光模組另包含一反射片設置於該底面下；該反射片包含一印刷層形成該光衰減結構，該印刷層位在該第一光源的該第一色光相對於該異色按鍵之傳播路徑在該反射片上之投影位置。The backlight module of claim 1, wherein the backlight module further comprises a reflective sheet disposed under the bottom surface; the reflective sheet comprises a printing layer to form the light attenuation structure, and the printing layer is located on the side of the first light source. The projection position of the first color light on the reflection sheet relative to the propagation path of the different-color keys.

如請求項1所述之背光模組，其中該至少一多色光源組設置於該導光板之一側或容置於該導光板中。The backlight module of claim 1, wherein the at least one multi-color light source group is disposed on one side of the light guide plate or accommodated in the light guide plate.

一種發光鍵盤，包含請求項1-11所述之背光模組與該複數個按鍵。A light-emitting keyboard includes the backlight module described in claim 1-11 and the plurality of keys.