CN1624574A

CN1624574A - Single chip liquid crystal projection optical engine using LED light source lamp and its projection device

Info

Publication number: CN1624574A
Application number: CNA2004100812636A
Authority: CN
Inventors: 范朝勋; 赖成军; 曾泽君
Original assignee: TAIYANG VIDEO INFORMATION TECHNOLOGY Co Ltd CHENGDU
Current assignee: TAIYANG VIDEO INFORMATION TECHNOLOGY Co Ltd CHENGDU
Priority date: 2004-11-18
Filing date: 2004-11-18
Publication date: 2005-06-08

Abstract

A liquid crystal projection optical engine using LED solid light source. The LED light comprises of panel plane lattice of RGB three colored LED chip, lens array is added on the top of flaring point, making the light can be transmitted along the direction of the light plane normal direction . The other parts comprise of flyeye matrix lens, flyeye matrix lens and overlaping lens, focusing leas, color filtering film, LCD liquid crystal optical valve with micro-lens array and projecting lens, the whole LCD projection optical engine is formed by adding LCD control circuit and LED control circuit.

Description

Adopt the single chip liquid crystal projection optical engine and the projection arrangement thereof of led light source lamp

Technical field

Patent of the present invention belongs to projection display apparatus, particularly a kind of projection arrangement that uses the one chip liquid crystal projection optical engine of led light source and use this light engine.

Background technology

In various little demonstrations (LCD-liquid crystal, DLP-digital light shows, the LCOS-liquid crystal on silicon) projecting optical engine, adopt UHP lamp (ultrahigh pressure mercury lamp) mostly as illuminator.At present, the UHP lamp is the best projection light source lamp of generally acknowledging, but it also has a series of weak point.Because principle of work, material and manufacturing process are limit, the life-span is shorter, and for example 10000 hours life-spans of 100W lamp, in 4000 hours life-spans of 120W lamp, power increases, and the life-span is shorter.Contain ultraviolet (UV) and infrared (IR) light in the radiation spectrum, the former is harmful to the LCD panel that contains organic composition, and the latter makes the whole optical engine heating, need add the UV-IR filter in addition, still can not eliminate the influence of UV-IR fully.It is generally acknowledged that the conversion efficiency of UHP lamp can reach 60lm/w, because be pointolite, must add reflex housing and obtain approximate parallel beam that its light efficiency is about 70%, so the light source conversion efficiency only has 40lm/w, this efficient has been difficult to improve, and not high enough efficient also causes heat.Be added with mercury in the UHP lamp, so be unfavorable for environmental protection.Vapour pressure is up to 200 atmospheric pressure in the UHP lamp, and lamp housing blast cracking and electrode burn easily take place shell Wen Gaoda 1000K, and reliability is not high enough.

The LED lamp is common in illumination and uses as the white light source lamp.White light LEDs mainly contains three technology paths at present: red, green, blue (RGB) multicore sheet combination white light technology perhaps is called the mixed technology of polychrome; Single-chip adds fluorescent powder synthesize white light technology, perhaps is called the wavelength Conversion technology; MOCVD direct growth multiple-active-region white light LEDs technology perhaps is called the mixing integrated technology.Mix integrated technology prematurity still at present.The wavelength Conversion technology is divided into blue chip again and adds YAG fluorescent powder, and the black light chip adds two types of RGB three primary colors fluorescent powders.Illumination is used the blue-light LED chips that adopt more and is added YAG fluorescent powder, and this method is simple, and cost is low, but the colour reproduction of its spectral characteristic and image display requirement is not inconsistent, and colour temperature is unadjustable, because of rather than the good scheme of projection light source lamp.

Three liquid crystal imaging devices are all adopted in practical at present crystal projection, the common name three-chip type, as shown in Figure 1.Among Fig. 1,1. be UHP lamp and cold light reverberator, 2. being cold light optical filter (UV-IR), 3. is the fly's eye matrix lens, 4. is the fly's eye matrix lens with overlapping lens, 5. be polarisation transformer (PCA), 6. being dichroic mirror (DM), 7. is condenser lens, 8. is the LCD plate, 9. being light-combining prism (X-Cube), 10. is projecting lens.The three-chip type complex structure, the cost height, the ratio of performance to price is not high, and popularization is restricted; Its volume is big, is difficult to make the mobile portable projection arrangement.

Summary of the invention

The purpose of patent of the present invention is in related projection arrangement, adopts the flat LED illuminator to replace the UHP point-source light, adopts spectral characteristic and many chipsets of the adjustable RGB of colour temperature LED white light scheme, adopts the liquid crystal one chip to replace the liquid crystal three-chip type.Therefore, the projection arrangement of this novelty has many advantages.

The present invention is achieved in that

Fig. 2 is the structural representation that patent of the present invention is used the single chip liquid crystal light engine of led light source lamp.The LED dot matrix is made area source, and three RGB monochromatic LEDs are formed a white luminous point, and lenslet is arranged at the luminous point top, and emergent ray is roughly directional light.1. be LED net plane light source, through spacing color mixed generation white-light illuminating.2. be the fly's eye matrix lens, the LED dot matrix sent the light that paroxysm goes out be divided into picture on the fly's eye matrix lens of back.3. be the compound lens of fly's eye matrix lens and overlapping lens, with each cell imaging of the first fly's eye matrix lens on the LCD panel plane, by overlapping lens with each junior unit the coincide together homogeneity of improving illumination and the color spot influence of eliminating array light source.4. be condenser lens, adjust the depth of parallelism of light beam, allow light as much as possible, increase efficient by the LCD panel.5. be color filter film (CF).6. for being added with the LCD panel of micro mirror array.7. be projecting lens.

Advantage of the present invention is:

1. use the LED dot matrix to make the illuminator of projection arrangement, improving the light source conversion efficiency still has very big potentiality; Light engine is simple in structure, and total transmitance is higher.Therefore, effective energy savings.

2.LED be the low-voltage solid state device, reliability and life-span are all guaranteed, help environmental protection.The single tube LED life-span can reach more than 50000 hours, and the life-span in projection arrangement uses is enough fully.

3. the dot matrix that adopts RGB multicore sheet to be combined into white light is arranged, and guarantees the peak feature of optical projection system RGB chromatogram, makes the picture color reduction true to nature, the colour temperature scalable.

4.LED luminescent spectrum does not contain infrared and ultraviolet band, does not need the UV--IR filter glass, has effectively reduced the thermal value of light engine, reduces engine noise, it is little to consume energy, and improves the functional reliability of LCD panel.

5. adopt veneer LCD scheme, effectively reduce optical device and use number, reduce the size of light engine, reduced manufacturing cost; Help miniaturization, portability.

Description of drawings

Fig. 1 is that employing UHP lamp is the exemplary block diagram of the three-chip type liquid crystal projection apparatus of light source

Fig. 2 is that employing LED lamp is the single chip liquid crystal projection arrangement structural drawing of light source

Fig. 3 is the spot arrangement mode figure of led light source matrix

Embodiment

Below in conjunction with the description of drawings specific embodiment:

In the led light source projecting optical engine structure shown in Figure 2,1. be the LED dot matrix, use the connection in series-parallel method allow each LED luminous manufacturing area source effect simultaneously, on dot matrix is arranged single RGB LED alternately so that form than uniform white light effect (see figure 3).Dash area among Fig. 3 is the luminous point that fly's eye matrix lens unit covers.The principle of arranging is that the rgb light point that each lens unit is covered can homochromyly not overlap, effectively improved the color spot phenomenon of illumination light when by overlapping lens the light beam of each unit being coincided together like this, in addition, fly's eye matrix lens cell size not exclusively can be improved the uniformity coefficient of illumination better for the integral multiple of led chip size.2. be the fly's eye matrix lens, effect is the light that the LED dot matrix sends to be cut apart be imaged on the second fly's eye matrix lens, simultaneously second each lens unit of fly's eye matrix lens is imaged on LED dot matrix board plane.The imaging situation can be shown in dash area among Fig. 3.For the width of cloth type specification of fluid,matching wafer, the shape of lens unit can be made 16: 9 or 4: 3 patterns, so that the beam shape coupling of illumination LCD panel.Concrete embodiment among Fig. 3 is 16: 9 forms.3. be the compound lens of fly's eye matrix lens and overlapping lens, with each cell imaging of the first fly's eye matrix lens on the plane of LCD sheet, by the color spot influence that overlapping lens coincide together each junior unit to improve the homogeneity of throwing light on and eliminate array light source, Fig. 3 dash area is the LED luminous point part that the fly lens unit covers.The focal length of first, second two fly's eye matrix lens unit is the same, and the focal length of overlapping lens is its distance to condenser lens.The k that this distance is first, second two fly's eye matrix distances doubly.The distance of the one the second two fly's eye matrixes is their focal length, and k is the ratio of LCD panel size and fly's eye matrix lens unit size.4. be condenser lens, focal length equates with the overlapping focal length of lens, adjusts each fly lens unit chief ray parallel optical axis, allows smooth vertical irradiation LCD sheet as much as possible, increases the efficiency of light energy utilization.5. be color filter film (CF), white light is resolved into three pixels of RGB that three colors of RGB correspond to the LCD sheet.6. be the LCD panel of band micro mirror array (MLA), connect driving circuit, the drive signal modulate illumination light produces image, and the micro mirror array convergent beam makes luminous energy as much as possible avoid grid in the LCD panel, and liquid crystal is crossed in transmission.7. be projecting lens, image is amplified and project imaging on the projection screen.

Because consider the illumination light surplus, the position of above-mentioned eyeglass is not to determine in strict accordance with the multiplying power relation, is approximate value.The number of fly lens unit can increase according to the size of used led chip or reduce, and size can be adjusted according to the employed LCD panel and the focal length of lens.

Claims

1. LED (light emitting diode) illuminator that is used for projection arrangement is characterized in that it is an area source, and three RGB (RGB) monochromatic LED chip is formed a white luminous point, colour temperature and output adjustable brightness joint.

2. in the lamp of led light source described in the claim 1, the luminous point top is coated with the lens arra of outgoing parallel rays, and led chip is arranged as alternately, does not all have continuous homochromy arrangement in level and vertical direction.

3. single chip liquid crystal projection optical engine, its light path constitutive characteristic are led light source lamp → fly's eye matrix lens → fly's eye matrix lens of adding lens arra and overlapping lens → condenser lens → color filter film → add LCD (the LCD panel) → projecting lens of micro mirror array.

4. in the described projection engine of claim 3, the not homochromy coincidence of rgb light point that fly's eye matrix lens unit covers, size be the integral multiple of rgb light spot size, to eliminate the interference color spot and to improve brightness uniformity; Select each focal length of lens, make and to improve optical energy utilization efficiency with the telecentric iris LCD panel of throwing light on.

5. a projection arrangement is characterized in that it has described led light source lamp of claim 1 and the described projecting optical engine of claim 3.Because the advantage performance of illuminator and light engine, thereby the technical advantage and the cost advantage of having given this liquid crystal projection apparatus.