CN1449188A - Calibration method for improving evenness of digital projection display system - Google Patents

Calibration method for improving evenness of digital projection display system Download PDF

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Publication number
CN1449188A
CN1449188A CN 02111240 CN02111240A CN1449188A CN 1449188 A CN1449188 A CN 1449188A CN 02111240 CN02111240 CN 02111240 CN 02111240 A CN02111240 A CN 02111240A CN 1449188 A CN1449188 A CN 1449188A
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China
Prior art keywords
projection display
brightness
display system
projection
picture dot
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CN 02111240
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Chinese (zh)
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CN1281054C (en
Inventor
邵剑心
樊斌
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Jingying Optics Co., Ltd.
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邵剑心
樊斌
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Priority to CN 02111240 priority Critical patent/CN1281054C/en
Publication of CN1449188A publication Critical patent/CN1449188A/en
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Publication of CN1281054C publication Critical patent/CN1281054C/en
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Abstract

The invention provides a calibration method of improving uniformity of a digital projection display system. The method comprises, insert a semi-transmission and semi-reflection lens in the light pathway of the projection display system, or rotate a reflective member to an angle; sampling, the collected signals are imaged on a plane-array sensor member; then extract information about uniformity of the projection system; finally, adjust parameters of each pixel in the display clip to improve uniformity of the system.

Description

A kind of calibration steps that improves evenness of digital projection display system
The present invention relates to photoelectric field, particularly a kind of calibration steps that improves the digital projection display system brightness uniformity.
In recent years, the technical development of high definition TV (HDTV) is very fast, and development has played many new Digital projection display techniques, as, liquid crystal on silicon reflection device (LCOS), high temperature polysilicon device, silica-based digital micro-mirror device (DMD) etc.
But that is that all right is ripe in the development of present various technology, still have many more serious problems to have to be solved, one of them more serious problem is because the imperfection of the display chip itself and the optical system of being correlated with, can cause the brightness irregularities on projection screen, and along with the increase of service time, the characteristic of display chip and system also can change to some extent, can more aggravate this inhomogeneities.
The object of the present invention is to provide a kind of simple and practical, convenient and reliable, can calibrate the method for improving evenness of digital projection display system at any time.
Method of the present invention is to insert a semi-transparent semi-reflecting lens in the light path of digital projection display system, perhaps certain reflecting element is rotated a certain angle, to extract sampled signal, then with this sampled signal imaging on an area array sensor spare of having calibrated, again according to the signal magnitude on each picture dot of this area array sensor spare, remove to adjust on the display chip the corresponding magnitude of voltage that is added on each picture dot, or the time of delay of pulse voltage signal value, to obtain preferable uniformity.
Description of drawings of the present invention is as follows:
Fig. 1 is a liquid crystal on silicon projection display system simplified schematic diagram.
Fig. 2 is polarization conversion efficiency and the graph of a relation that is added in the voltage on the liquid crystal layer.
Fig. 3 is a kind of sample information extracting method simplified schematic diagram.。
Fig. 4 is another kind of sample information extracting method simplified schematic diagram
Below in conjunction with accompanying drawing the present invention is elaborated.But do not limit content of the present invention.
Accompanying drawing 1 is the rough schematic of liquid crystal on silicon projection display system.When through the s traverse line polarization illumination light 1 of homogenizing after the reflection of polarization splitting prism 2, shine liquid crystal on silicon and show on (LCOS) chip 3.Because the effect of liquid crystal layer, the illuminating ray of this s direction polarization have part and be converted into p direction polarised light, the amount of its conversion is determined (relation as shown in Figure 2) by the magnitude of voltage that is added on the liquid crystal layer.This p direction polarised light can pass polarization splitting prism 2, behind the amplification imaging of projection objective 4, projects on the display screen again.By on each picture dot of LCOS chip, adding different voltage, just can projection go out needed image.The basic functional principle of Here it is LCOS projection display system.In the optical projection system of reality, because the reflectivity of each picture dot speculum of LCOS chip is inconsistent, the factors such as imperfection of the optical system of the inhomogeneous and Projection Display of lighting source, even the voltage that adds on each picture dot of LCOS chip is all identical, the image that actual projection goes out also can be uneven, and one solves this heteropical method and revised by the magnitude of voltage on each picture dot that is adjusted at the LCOS chip.But As time goes on, because the factors such as aging and sex change of LCOS chip, the uniformity that this correction is good can be destroyed once more, needs to revise once more.
Revise heterogeneity, just must obtain heteropical information earlier, accompanying drawing 3 and accompanying drawing 4 are respectively the modes that heterogeneity information is obtained in two kinds of samplings.Method shown in the accompanying drawing 3 is that a semi-transparent semi-reflecting lens 5 is inserted in the emitting light path, and the emergent ray of a part is imaged on the one side battle array light sensor spare 7 through sampling object lens 6.This face battle array light sensor spare can be area array CCD device or face battle array CMOS light-sensitive device, must calibrate the photosensitive response rate and the linearity of each picture dot of this face battle array device with an even lighting source in advance, so this light-sensitive device can be measured the heterogeneity information of projected image.
When the heterogeneity of actual correction projected image, at first be that input picture is set to uniform monochrome image, (as uniform red image), then according to the heterogeneity information that obtains on the face battle array light sensor spare, magnitude of voltage on each picture dot of adjustment LCOS chip, (usually the magnitude of voltage on each picture dot all is arranged on and is lower than colour saturation voltage, therefore suitably reduce the magnitude of voltage on the bright excessively picture dot of brightness, can make the brightness on the whole image be tending towards even), make the brightness of whole projected picture even, and magnitude of voltage is input to a storage and go in the memory chip to preserve on will each picture dot of this moment.For other color image (as green or blue), then repeat above-mentioned steps, equally also will reach on brightness each picture dot when even magnitude of voltage and be input in the storage memory chip and preserve.These are kept at the magnitude of voltage of storage in the memory chip just as the reference voltage of each picture dot.When treating the projection real image, need only be with the grey progression of each picture dot, and the reference voltage of this picture dot just can have been calculated the magnitude of voltage that need be added on this picture dot by certain relation.
When the Projection Display dynamic image, the voltage that is added on each picture dot is potential pulse, and refreshes by certain frequency, regulates the time of delay of this potential pulse, the brightness of same this picture dot point of scalable.Therefore, the luminance non information according to sampling obtains suitably reduces the potential pulse time of delay on the bright excessively picture dot point of brightness, can play the inhomogeneity purpose of calibration projection brightness equally.
4 in accompanying drawing is another kind of sample mode, it is by some reflective optical devices of rotation, and rotatory polarization Amici prism 2 as shown in FIG. changes a direction with emitting light path, thereby can image on the face battle array light sensor spare 7 by sampling object lens 6, obtain the luminance non information of system.Its calibration steps, then identical with the calibration steps of above-mentioned accompanying drawing 3, also be by importing uniform monochromatic projection image, thereby calculate the reference voltage value of each picture dot and preserved, when waiting to import real image, calculate magnitude of voltage on each picture dot by this reference voltage value weighting again.
Sample mode is many in addition, does not exemplify one by one here.
For high temperature polysilicon liquid crystal projection display systems and digital micro-mirror projection display system, the projection brightness uniformity of the method calibration system that available and said method is similar.
The present invention has following beneficial effect:
1. adopt method of the present invention can effectively calibrate because display chip and optical system Imperfection and the luminance nonuniformity that causes.
2. adopt method of the present invention to calibrate luminance non voluntarily by the user, thereby can overcome the performance degradation problem of bringing owing to factors such as chip are aging at user side.
3. method of the present invention can be applied in the various digital projection display systems.

Claims (7)

1. a calibration steps that improves evenness of digital projection display system is characterized in that utilizing the heteropical information of system brightness of sampling and obtaining, and adjusts each parameter by computing, makes the brightness uniformity.
2. the method for claim 1 is characterized in that being added in magnitude of voltage on each picture dot of display chip by adjustment, obtains uniform projection brightness.
3. the method for claim 1 is characterized in that being added in by adjustment time of delay of the refresh voltage pulse on each picture dot of display chip obtaining uniform projection brightness.
4. the method for claim 1 is characterized in that three kinds of colors of red, green, blue are calibrated its brightness uniformity respectively.
5. the method for claim 1 is characterized in that being applied to the brightness uniformity calibration of silicon base liquid crystal reflective projection display system.
6. the method for claim 1 is characterized in that being applied to the brightness uniformity calibration of high temperature polysilicon liquid crystal projection display systems.
7. the method for claim 1 is characterized in that being applied to the brightness uniformity calibration of silica-based digital micro-mirror projection display system.
CN 02111240 2002-04-02 2002-04-02 Calibration method for improving evenness of digital projection display system Expired - Fee Related CN1281054C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02111240 CN1281054C (en) 2002-04-02 2002-04-02 Calibration method for improving evenness of digital projection display system

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Application Number Priority Date Filing Date Title
CN 02111240 CN1281054C (en) 2002-04-02 2002-04-02 Calibration method for improving evenness of digital projection display system

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CN1449188A true CN1449188A (en) 2003-10-15
CN1281054C CN1281054C (en) 2006-10-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1893598B (en) * 2005-07-04 2010-09-22 康佳集团股份有限公司 Projection television imaging method and corresponding projection television set
CN104735429A (en) * 2013-12-19 2015-06-24 现代自动车株式会社 Display device and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1893598B (en) * 2005-07-04 2010-09-22 康佳集团股份有限公司 Projection television imaging method and corresponding projection television set
CN104735429A (en) * 2013-12-19 2015-06-24 现代自动车株式会社 Display device and method
CN104735429B (en) * 2013-12-19 2018-02-06 现代自动车株式会社 Display device and display methods

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Applicant before: Shao Jianxin

Co-applicant before: Fan Bin

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