200923543 • 九、發明說明： ， 【發明所屬之技術領域】 本發明涉及一種投影顯示裝置，尤其係關於一種具有 繞射光柵元件之投影顯示裝置。 【先前技術】 投影儀作為個人電腦及電視機能夠放大視頻之影像並 在螢幕上放映之裝置正得到廣泛地應用。一般液晶光學投 影顯示裝置可依光學元件多少分為：單鏡頭式、雙鏡頭式 (' 以及三鏡碩式三種，如圖1所示，為一種單鏡頭式之投影 顯示裝置’該投影顯示裝置包括一提供光線之燈源21，一 可反射光線之偏振分光棱鏡22、一具有相位校正功能之四 分之一波板23、一反射式光閥24以及一投影影像之鏡頭 25。其中偏振分光棱鏡22位於燈源21之下方，其上具有 一由左至右傾斜之薄膜221，該薄膜221被夾設地兩玻璃 塊222之間，借此構成一個使不同偏振光反射或透射之立 方體。也就是說，該偏振分光棱鏡22可讓P偏振光線通過， ί .> 但將S偏振光線反射，而該四分之一波板23及反射光閥 24都位於偏振分光棱鏡22之一側，鏡頭25則位於偏振分 光棱鏡22之相對於所述波板23及反射光閥24之另—侧。 當燈源21投射出S偏振光線時，光線在到達偏振分光 棱鏡22之薄膜221時，分向四分之一波板23反射，第— 次通過波板23後再投射到反射光閥24上。當反射光間24 呈開啟狀態時’ S偏振光線會反射並轉換成p偏振蘇，费、 後反向第二次通過波板23後造成如同通過一次二分之」 6 200923543 波板之功能’達到調整光線相位之目的，而後經偏振分光 棱鏡22 ’最後到達鏡頭25投影顯像。相反，在反射光閥 2^關閉時’ S偏振光線經偏振分光棱鏡22的薄膜221反射 日守’同樣過波板23到達反射光閥24，經由反射光闊24 的反射’光線會依原來路徑反射回去，也就是光線無法穿 過薄膜221到達鏡頭25。 上述的投影顯示裝置由於玻璃222在製造上會有熱應 力殘留’當光線投射路徑經過熱應力殘留之區域時，光線 產生之折射角度會有所不同，且光線行經玻璃222之玻璃 塊越大’其偏離之折射角度會越大，這將使得鏡頭25所呈 現影像顏色均勻度降低。同時，因為有部分光被偏振分光 棱鏡22反射出去’沒有被利用，使得光之利用率降低。 【發明内容】 有#於此’有必要提供一種能夠提高影像均勻度及光 之利用率之投影顯示装置。 —種投影顯示裝置，其包括沿光路依次設置之一光柵元 件’用於將其所接收之入射光分成紅、綠、藍三種顏色之 光亚發射出去以及一液晶面板，設置於所述光柵元件之出 射光路上’用於為其所接收之入射光載入圖像訊息並發射 載入有圖像訊息之出射光。 與先前技術相比，上述投影顯示裝置利用光栅元件之 分光功能不會因為有熱應力之存在而產生折射角度之不 同’這將提高所呈現影像顏色均勻度，而且因所有由光源 兀件發射之光都得到了利用，從而提高了該投影顯示裝置 200923543 之光之利用率。 【實施方式】 下面將結合附圖，舉以下較佳實施方式並配合圖式詳 細描述如下。 請參閱圖2，其為本發明提供之投影顯示裝置1Q之結 構示意圖。該投影顯示裝置10包括沿光路依次設置之一光 源組件11’一設置於所述光源元件n之出射光路上之光柵 元件12,-設Ϊ於所述光柵元件12之出射光路上之液晶BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display device, and more particularly to a projection display device having a diffraction grating element. [Prior Art] A projector that is capable of amplifying a video image and displaying it on a screen as a personal computer and a television is being widely used. Generally, the liquid crystal optical projection display device can be divided into several types according to optical components: single lens type, double lens type ('and three mirror type three types, as shown in FIG. 1 , which is a single lens type projection display device'). The utility model comprises a light source 21 for providing light, a polarization beam splitting prism 22 for reflecting light, a quarter wave plate 23 with phase correction function, a reflective light valve 24 and a lens 25 for projecting images. The prism 22 is located below the light source 21 and has a left-to-right inclined film 221 interposed between the two glass blocks 222, thereby forming a cube which reflects or transmits differently polarized light. That is, the polarization beam splitting prism 22 allows the P-polarized light to pass through, but the S-polarized light is reflected, and the quarter-wave plate 23 and the reflected light valve 24 are located on one side of the polarization beam splitting prism 22. The lens 25 is located on the other side of the polarization beam splitting prism 22 with respect to the wave plate 23 and the reflected light valve 24. When the light source 21 projects S-polarized light, when the light reaches the film 221 of the polarization beam splitting prism 22, Minute Reflected to the quarter-wave plate 23, the first pass through the wave plate 23 and then projected onto the reflected light valve 24. When the reflected light 24 is turned on, the 'S-polarized light will be reflected and converted into p-polarized Su, After the second pass through the wave plate 23, the effect of adjusting the light phase is achieved by the function of the second phase of the "200923543 wave plate", and then the polarized beam splitting prism 22' finally reaches the lens 25 to project the image. On the contrary, When the reflective light valve 2 is closed, the S-polarized light is reflected by the thin film 221 of the polarizing beam splitting prism 22, and the same wave plate 23 reaches the reflected light valve 24, and the light is reflected back through the original path. That is, the light cannot pass through the film 221 to reach the lens 25. The above-mentioned projection display device has thermal stress residual in the manufacture of the glass 222. When the light projection path passes through the region where the thermal stress remains, the angle of refraction of the light will be The difference is that the larger the glass block through which the light passes through the glass 222, the larger the angle of refraction of the deviation, which will cause the image uniformity of the image displayed by the lens 25 to decrease. A part of the light is reflected by the polarization beam splitting prism 22' is not utilized, so that the utilization of light is lowered. [Invention] It is necessary to provide a projection display device capable of improving image uniformity and utilization of light. a projection display device comprising a grating element arranged in sequence along the optical path for emitting light into three colors of red, green and blue, and a liquid crystal panel disposed on the grating element The outgoing light path 'is used to load an image message for the incident light it receives and emit the emitted light loaded with the image information. Compared with the prior art, the above-mentioned projection display device utilizes the spectral function of the grating element not because The presence of thermal stress produces a difference in the angle of refraction' which will increase the color uniformity of the image presented, and the use of all light emitted by the source element will be utilized, thereby increasing the light utilization of the projection display device 200923543 . [Embodiment] Hereinafter, the following preferred embodiments will be described in detail with reference to the accompanying drawings. Please refer to FIG. 2, which is a schematic diagram showing the structure of a projection display device 1Q provided by the present invention. The projection display device 10 includes a light source assembly 11' disposed along the optical path, a grating element 12 disposed on the outgoing light path of the light source element n, and a liquid crystal disposed on the outgoing light path of the grating element 12.
面板13以及一設置於所述液晶面板13之出射光路上之投 影鏡頭14。 所述光源組件11用於為該投影顯示裝置1〇提供光線， 其包括依光路設置之一照明光源ιη、以及—積分器Η〕。 所述照明光源m發射包括顯示彩色圖像所需之红光 及藍光⑻之白光。該照明光源111可以為卣素燈、 光=b:燈、山气燈或LED等。在本實施方式中，該照明 使用、日1 ί _素燈。所述積分器112料Μ化及有效地 使用妝明光源ill發出之光。 光柵斤二件12可以為透射式光栅’也可以為繞射式 平行細敏且件可以通過在平面或凹面鏡上刻上複數 光柵模型上^#距之狹縫而形成—個光柵模型，再在該 取下與模型」主人—層膠棉溶液，待該膠棉溶液凝固後， 便成為1欵的&層膠棉膜，固定於兩麵片之中間， 面上，則成^射式光栅。料取下之膠棉_定於金屬表 為繞射式光柵。在本實施方式中，所述光栅元 8 200923543 件12為一個繞射式光栅。當光照射所述光栅元件12時， 該光柵元件12利用其上刻畫之狹缝而產生光程差，從而產 生不同波長之光譜，通過狹縫之寬度以及狹缝之間距之設 置，可將入射光分成紅、綠、藍三種顏色的光，並且通過 所述金屬表面將該紅、綠、藍三種光反射出去。 所述液晶面板13包括微透鏡陣列131與液晶顯示元件 132。所述微透鏡陣列131位於液晶顯示元件132之入射面 一側，該微透鏡陣列131包括複數微透鏡，微透鏡與液晶 顯示元件132中之像素——對應。利用該微透鏡陣列131 之匯聚作用，來提高該液晶面板13之出射光之亮度。同時 利用為所述液晶顯示元件132所載入之電訊號，控制液晶 顯示元件132内部之液晶分子之旋轉，從而控制紅、綠、 藍三色光之通過率，以形成攜帶圖像訊息之三色光並出射。 所述投影鏡頭14設置於所述液晶面板13之出射光路 上，用於將出射光所形成之圖像放大，並將放大之圖像投 影到螢幕（圖未示）上。 與先前技術相比，上述之投影顯示裝置利用光栅元件 之分光功能不會因為有熱應力之存在而產生折射角度會不 同，這將提高投影鏡頭所呈現影像顏色均勻度，而且因所 有由光源元件發射之光都得到了利用，從而提高之該投影 顯示裝置之光之利用率。 綜上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，舉凡熟悉本案技藝 9 200923543 之人士援依本發明之精神所作之等效修飾或變化，皆應涵 蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1係先前之一種投影顯示裝置之結構示意圖。 圖2係本發明實施方式提供之一種投影顯示裝置之結 構不意圖。 【主要元件符號說明】 投影顯示裝置 10 光源組件 11 光源 111 積分柱 112 光栅元件 12 液晶面板 13 微透鏡陣列 131 液晶顯不元件 132 投影鏡頭 14 燈源 21 偏振分光棱鏡 22 薄膜 221 玻璃塊 222 波板 23 反射光閥 24 鏡頭 25 10The panel 13 and a projection lens 14 disposed on the outgoing light path of the liquid crystal panel 13 are provided. The light source assembly 11 is configured to provide light to the projection display device 1 , which includes an illumination source ηη, and an integrator 依. The illumination source m emits white light including red light and blue light (8) required to display a color image. The illumination source 111 may be a halogen lamp, a light=b: lamp, a mountain lamp or an LED. In the present embodiment, the illumination is used as a daylight. The integrator 112 is deuterated and effectively uses the light from the light source ill. The two gratings 12 can be a transmissive grating or a diffractive parallel sensitive element and can be formed by engraving a slit on a complex grating model on a plane or concave mirror, and then forming a grating model. The removal and the model "master - layer of cotton wool solution, after the cotton solution is solidified, it becomes a 1 欵 & layer of rubber film, fixed in the middle of the two sides, on the surface, then into the grating . The material removed from the material _ is set on the metal surface as a diffraction grating. In the present embodiment, the grating element 8 200923543 is a diffraction grating. When the light illuminates the grating element 12, the grating element 12 uses the slits drawn thereon to generate an optical path difference, thereby generating a spectrum of different wavelengths, which can be incident through the width of the slit and the distance between the slits. The light is divided into three colors of red, green, and blue, and the red, green, and blue lights are reflected by the metal surface. The liquid crystal panel 13 includes a microlens array 131 and a liquid crystal display element 132. The microlens array 131 is located on the side of the incident surface of the liquid crystal display element 132. The microlens array 131 includes a plurality of microlenses corresponding to the pixels in the liquid crystal display element 132. The brightness of the light emitted from the liquid crystal panel 13 is increased by the convergence of the microlens array 131. At the same time, by using the electrical signal loaded by the liquid crystal display element 132, the rotation of the liquid crystal molecules inside the liquid crystal display element 132 is controlled, thereby controlling the transmittance of the three colors of red, green and blue light to form a three-color light carrying the image information. And out. The projection lens 14 is disposed on an exiting optical path of the liquid crystal panel 13 for amplifying an image formed by the emitted light, and projecting the enlarged image onto a screen (not shown). Compared with the prior art, the above-mentioned projection display device utilizes the light splitting function of the grating element without different refractive angles due to the presence of thermal stress, which will improve the image color uniformity exhibited by the projection lens, and because of all the light source components The emitted light is utilized to increase the light utilization of the projection display device. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art of the present invention 9 200923543 in accordance with the spirit of the present invention. All should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic structural view of a conventional projection display device. Fig. 2 is a schematic view showing the structure of a projection display device according to an embodiment of the present invention. [Description of main components] Projection display device 10 Light source assembly 11 Light source 111 Integration column 112 Grating element 12 Liquid crystal panel 13 Microlens array 131 Liquid crystal display element 132 Projection lens 14 Light source 21 Polarization beam splitting prism 22 Film 221 Glass block 222 Wave plate 23 Reflective light valve 24 Lens 25 10