KR100892068B1 - Scanning color display apparatus which can control gamma, color image controlling method and recordable medium thereof - Google Patents

Abstract

Light source; A one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with the color light emitted from the light source according to an optical modulator control signal; A scanner for projecting the modulated beam to a predetermined position on a screen according to a scanner control signal; And receiving an image signal, converting input light intensity information extracted from the image signal into reference light intensity information with a gamma variable adjusted, and applying the optical modulator control signal and the optical modulator control signal corresponding to the reference light intensity information. The scanning color display apparatus may include an image control circuit configured to transmit and control the scanner control signal for controlling the rotation angle of the scanner to the one-dimensional optical modulator element and the scanner, respectively. It is possible to convert the relationship between the amount of light and the input signal into an arbitrary nonlinear relationship by digitally preprocessing the input signal through a linear driving integrated circuit having a light intensity to drive voltage configuration.

Gamma, Scanning, Color Image, Reference Table, Luminance

Description

Scanning color display apparatus which can control gamma, color image controlling method and recordable medium

1 is a graph showing a relationship between light intensity versus driving voltage (V) and light intensity versus brightness in a general driving integrated circuit.

2 is a graph showing a relationship between light intensity versus driving voltage (V) and light intensity versus brightness in a driving integrated circuit having a linear characteristic.

3 is a block diagram of a scanning color display device including a one-dimensional optical modulator device according to an embodiment of the present invention.

4 to 6 is a view showing the micro mirror and modulation principle included in the one-dimensional optical modulator element.

7 is a flowchart of a color image control method according to an exemplary embodiment of the present invention.

8 is a graph showing the relationship between the driving voltage (V), the displacement (H) and the brightness (I) of the micromirror 20 in the one-dimensional optical modulator element (130).

9 is a graph illustrating a conversion relationship reflecting a gamma variable between input light intensity information and reference light intensity information according to an exemplary embodiment of the present invention.

10 is a view showing the brightness curve of the modulation beam compared to the input light intensity information according to the present invention.

<Description of the symbols for the main parts of the drawings>

110: light source

130: 1-D optical modulator element

150: scanner

170: screen

180: image control circuit

20: micro mirror

The present invention relates to a scanning color display device, and more particularly, to a scanning color display device and a method thereof, in which a gamma parameter can be adjusted by digitally preprocessing a driving integrated circuit included in a one-dimensional diffractive optical modulator device. will be.

Recently, with the development of display technology, the demand for the implementation of large images is increasing day by day. Currently, most large image display devices (mainly projectors) use liquid crystals as optical switches. Compared with the CRT projectors of the past, it is small and inexpensive, and the optical system is simple and used. However, it is pointed out that a large amount of light loss occurs because light from the light source is transmitted through the liquid crystal plate to the screen. Therefore, a brighter image can be obtained by reducing light loss by utilizing a micromachine such as an optical modulator element using reflection.

Micromachines are extremely small machines that are difficult to discern with the naked eye. Also known as MEMS (Micro Electro Mechanical System), it can be called microelectromechanical system or device. It is mainly made by applying semiconductor manufacturing technology. It is applied to various information equipment parts such as magnetic and optical heads using micro-optics and limiting devices, and it is also applied to biomedical field and semiconductor manufacturing process using various micro fluid control technologies. Micromachines can be divided into micro-sensors that function as sensing elements, micro-actuators as driving devices, and miniature machines that serve as energy transfer devices.

MEMS is applied to the optical field as one of various application fields. MEMS technology enables the fabrication of optical components smaller than 1mm, enabling ultra-compact optical systems.

Micro-optical components such as optical modulator elements and micro lenses, which are miniature optical systems, have been adopted and applied to communication devices, displays, and recording devices due to advantages such as fast response speed, small loss, and ease of integration and digitization.

The one-dimensional optical modulator element used in the scanning color display device, which is a kind of display, is composed of a driving integrated circuit and a plurality of micro mirrors. One or more micromirrors are gathered to represent one pixel of the projected image.

In this case, in order to express the light intensity of one pixel, that is, the light intensity, the micromirror changes the amount of diffracted light by changing its displacement in proportion to the driving voltage applied from the driving integrated circuit. Here, the driving integrated circuit generates a driving voltage having a specific relationship with respect to the input signal. The amount of diffracted light has a specific nonlinear relationship with the driving voltage.

1 is a graph illustrating a relationship between light intensity versus driving voltage (V) and light intensity versus brightness in a general driving integrated circuit, and FIG. It is a graph showing the relationship between the light intensity versus the driving voltage (V) and the relationship between the light intensity versus the brightness.

The general driving integrated circuit in FIG. 1 is used in an LCD display device. In general driving integrated circuits, the relationship between the light intensity and the driving voltage is in the form of an arccosine function, and thus, the relationship between the light intensity and the brightness is fixed in the form of a linear function as shown in FIG. .

2 shows the relationship between the light intensity versus the driving voltage in the driving integrated circuit in the scanning color display device using the one-dimensional optical modulator element. The relationship between the light intensity and the driving voltage in the driving integrated circuit is in the form of a linear function, and thus the relationship between the light intensity and the brightness is fixed in the form of an arc cosine function as shown in FIG.

That is, there is a limit in expressing an image having an arbitrary luminance characteristic desired by a user because the relationship of brightness to light intensity is fixed.

Accordingly, the present invention provides a scanning color capable of converting the relationship between the amount of light and the input signal into an arbitrary nonlinear relationship by digitally preprocessing the input signal through a linear driving integrated circuit having a light intensity versus drive voltage. A display apparatus, a color image control method, and a color image control recording medium are provided.

In addition, the present invention provides a scanning color display apparatus, a color image control method, and a color image control recording medium which can easily change the luminance characteristic of a projection image represented by a 1D optical modulator device into a gamma curve of a user's preferred form. .

The present invention also provides a scanning color display apparatus, a color image control method, and a color image control recording medium capable of quickly and digitally preprocessing an input signal using a lookup table.

Other objects of the present invention will be readily understood through the following description.

In order to achieve the above object, according to an aspect of the present invention, a light source; A one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with the color light emitted from the light source according to an optical modulator control signal; A scanner for projecting the modulated beam to a predetermined position on a screen according to a scanner control signal; And receiving an image signal, converting input light intensity information extracted from the image signal into reference light intensity information with a gamma variable adjusted, and applying the optical modulator control signal and the optical modulator control signal corresponding to the reference light intensity information. The scanning color display apparatus may include an image control circuit configured to transmit and control the scanner control signal for controlling the rotation angle of the scanner to the one-dimensional optical modulator element and the scanner, respectively.

Preferably, the input light intensity information and the reference light intensity information may be light intensity of each pixel constituting the one-dimensional scan line, respectively.

The one-dimensional optical modulator device may further include a driving integrated circuit configured to generate a driving voltage according to the optical modulator control signal; And a plurality of micro mirrors configured to generate the modulated beam by modulating the beam incident by the displacement that is changed according to the driving voltage.

Here, the driving voltage may be proportional to the reference light intensity information. In addition, the micromirror may change its displacement in proportion to the driving voltage.

이고, I는 상기 변조빔의 밝기, I_o는 상기 변조빔의 평균 밝기, λ는 상기 변조빔의 파장, H는 상기 구동전압에 의한 변위변화량, H_o는 상기 마이크로 미러의 초기 변위이고, +부호는 상기 변조빔이 0차 회절광인 경우이고, -부호는 상기 변조빔이 ±1차 회절광인 경우이다.In addition, the relationship between the brightness of the modulation beam and the displacement by the micromirror may be represented by a cosine function. Here, the cosine function

I is the brightness of the modulation beam, I _o is the average brightness of the modulation beam, λ is the wavelength of the modulation beam, H is the amount of displacement change by the driving voltage, H _o is the initial displacement of the micromirror, + The sign is the case where the modulated beam is zero-order diffracted light, and the sign-is the case where the modulated beam is ± first-order diffracted light.

이고, B_std 는 기준 광강도 정보, B_input 은 입력 광강도 정보, N은 상기 기준 광강도 정보의 분해능,

는 상기 감마 변수,

이고, +부호는 상기 변조빔이 0차 회절광인 경우이고, -부호는 상기 변조빔이 ±1차 회절광인 경우이다. The relationship between the reference light intensity information and the input light intensity information may be represented as an inverse function of the cosine function. Here, the inverse function

B _std is reference light intensity information, B _input is input light intensity information, N is resolution of the reference light intensity information,

Is the gamma variable,

Where + is the case where the modulated beam is zero-order diffracted light, and-is the case where the modulated beam is ± first-order diffracted light.

Preferably, the image control circuit has a look-up table storing a correspondence between the input light intensity information and the reference light intensity information according to the gamma variable, and the input light by the reference table The conversion from the intensity information to the reference light intensity information may be performed.

In addition, the resolution of the reference light intensity information may be higher than the resolution of the input light intensity information.

And the gamma variable is adjustable.

In order to achieve the above objects, according to another aspect of the present invention, there is provided a light source, a one-dimensional optical modulator element for generating a modulated beam of one-dimensional scanning line modulating color light emitted from the light source, and the modulated beam on a screen. A method of controlling an image of a scanning color display device including a scanner projecting at a position, the method comprising: (a) receiving an image signal including input light intensity information on the color light; (b) extracting the input light intensity information from the video signal; (c) converting the input light intensity information into reference light intensity information; And (d) causing the one-dimensional light modulator device to modulate the color light according to the reference light intensity information, and to project the color light onto the screen through the scanner.

Preferably, the step (c) converts the input light intensity information from the reference light intensity information by a reference table storing a correspondence relationship between the input light intensity information and the reference light intensity information according to the gamma variable. Can be performed.

In order to achieve the above objects, according to another aspect of the present invention, a color image control recording medium having a computer readable and executable code recorded thereon may be provided.

Hereinafter, exemplary embodiments of a scanning color display apparatus, a color image control method, and a color image control recording medium according to the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Numbers (eg, first, second, etc.) used in the description of the present specification are merely identification symbols for sequentially distinguishing identical or similar entities.

3 is a block diagram of a scanning color display device including a 1D optical modulator device according to an exemplary embodiment of the present invention. 4 to 6 are diagrams showing the micro mirror and modulation principle included in the one-dimensional optical modulator device.

Referring to FIG. 3, the scanning color display apparatus includes a light source 110, an illumination optical system 120, a one-dimensional optical modulator element 130, a relay optical system 140, a scanner 150, a projection optical system 160, and a screen ( 170 and an image control circuit 180.

The light source 110 irradiates a beam to project an image onto the screen 170. The light source 110 may emit white light, or may emit any one of three primary colors of red, green, and blue light. Preferably, the light source 110 may be a laser, an LED or a laser diode. When irradiating white light, a color separation unit (not shown) may be provided to separate white light into red light, green light, and blue light according to a predetermined condition.

The illumination optical system 120 reflects the direction of the beam projected from the light source 110 at a predetermined angle so that the beam is concentrated on the one-dimensional optical modulator element 130. When color separation is performed by a color separation unit (not shown), a function of concentrating the beam may be added.

The one-dimensional optical modulator element 130 modulates the beam irradiated through the illumination optical system 120 according to the optical modulator control signal received from the image control circuit 180 to generate a modulated beam that is diffracted light. The one-dimensional optical modulator device 130 controls the light intensity corresponding to any one of the vertical scanning lines of the image to be displayed or controls the light intensity corresponding to any one of the horizontal scanning lines.

In the following description, it is assumed that the one-dimensional optical modulator element 130 corresponds to any one of the vertical scan lines in an image forming one frame.

The one-dimensional optical modulator element 130 includes a plurality of micro mirrors.

Referring to FIG. 4, the micromirror 20 includes a substrate 1, an insulating layer 2, a sacrificial layer 3, a ribbon structure 4, and a piezoelectric body 5.

5 (a) and 5 (b) are sectional views showing an enlarged portion A in FIG. When the wavelength of light is λ, the insulating layer on which the ribbon structure 4 and the lower reflecting layer 2a are formed, in which the micromirror 20 is not deformed (no voltage is applied), and the upper reflective layer 4a is formed. The interval between (2) is equal to λ / 2. Therefore, the total path difference between the light reflected from the ribbon structure 4 and the insulating layer 2 is equal to λ so that the zeroth order diffracted light (i.e., the reflected light) interferes with constructive interference, and the ± first order diffracted light has a destructive interference ( (A) of FIG. 5).

In addition, when a proper voltage is applied to the piezoelectric body 5, the ribbon structure 4 moves toward the insulating layer 2 or vice versa by the pressure generated in the piezoelectric body 5. At this time, the interval between the ribbon structure 4 and the insulating layer 2 on which the lower reflective layer 2a is formed is equal to λ / 4 or 3λ / 4. Therefore, the total path difference between the light reflected from the ribbon structure 4 and the insulating layer 2 is equal to λ / 2 so that the zeroth order diffracted light has a destructive interference and the ± 1st order diffracted light has a constructive interference (see FIG. b)).

That is, in the case of using the 0th order diffracted light, it has the maximum brightness due to constructive interference when the path difference of the diffracted light is an even multiple of λ / 2, and has the minimum brightness due to the destructive interference when an odd multiple of λ / 2.

In the case of using the ± 1st order diffracted light, when the path difference of the diffracted light is an even multiple of [lambda] / 2, it has a minimum brightness due to the destructive interference, and has a maximum brightness due to constructive interference when an odd multiple of [lambda] / 2.

If necessary, the micromirror 20 uses zero-order diffraction light or ± first-order diffraction light, and the principle of interference is as described above. By using the result of such interference, the micromirror 20 may load the signal to the light by adjusting the amount of light of the incident beam. A portion of the sacrificial layer 3 is here used to support the ribbon structure 4 without being etched.

The micromirror 20 illustrated in FIG. 4 is responsible for any one pixel among a plurality of pixels constituting the vertical scanning line to adjust gray scale, that is, light intensity.

Referring to FIG. 6, a plurality of micromirrors 20-1, 20-2,..., 20-m illustrated in FIG. 4, which is one pixel, are gathered together (here m (natural numbers)) to form a one-dimensional optical modulator. The element 130 is formed. The one-dimensional optical modulator element 130 is a diffracted light having a plurality of micro mirrors (20-1, 20-2, ..., 20-m) gathered in parallel to have a different signal size for a constant incident beam by the interference principle, As a device capable of generating a modulated beam and carrying a signal on light, a device that is in charge of a vertical scanning line, which is a one-dimensional image line, as described above, is generally referred to.

Hereinafter, the one-dimensional optical modulator device 130 will be described as being in charge of a vertical scan line, that is, a one-dimensional image line, composed of m pixels (where m is a natural number).

The one-dimensional optical modulator device 130 is configured to generate a driving voltage for each pixel according to the light intensity information of each pixel constituting the vertical scan line included in the optical modulator control signal. Therefore, a plurality of micro mirrors 20-1, 20-2, ..., 20-m are used to generate modulated beams of light diffracted light whose modulated light intensity is modulated using the interference or diffraction principle of light.

Preferably, the plurality of micro mirrors 20-1, 20-2, ..., 20-m is equal to the number of pixels constituting the vertical scanning line. The modulated diffracted light is light in which image information (ie, light intensity information) of a vertical scan line to be projected on the screen 170 is reflected later. Here, the diffracted light may be zero-order diffracted light or ± first-order diffracted light. The relay optical system 140 may transmit the modulated beam generated by the one-dimensional optical modulator element 130 to the scanner 150. One or more lenses may be included, and the modulation beam is adjusted as necessary to match the size of the one-dimensional optical modulator device 130 and the size of the scanner 150 to deliver the modulated beam.

The scanner 150 reflects the modulated beam incident through the relay optical system 140 at a predetermined angle and projects it onto the screen 170. In this case, the predetermined angle is determined by the scanner control signal received from the image control circuit 180. The scanner control signal rotates the scanner 150 at an angle at which the modulation beam can be projected at the position of the vertical scan line on the screen 170 corresponding to the optical modulator control signal in synchronization with the optical modulator control signal.

The scanner 150 may be a galvanometer scanner or a polygon mirror scanner. The galvano scanner has a rectangular plank shape and a mirror is attached to one side. It rotates left and right within a predetermined angle range about an axis, and in the present invention, the image is projected on the screen 170 by changing the reflection angle of the incident light when rotating in either the left or right direction or left and right directions. Polygon mirror scanners have the shape of a polygonal column with mirrors attached to the sides of the polygonal column. The mirrors attached to each side surface rotate in one direction about the axis to change the reflection angle of the light incident by the rotation to project an image on the screen 170.

The projection optics 160 allow the modulation beams reflected by the scanner 150 to be projected onto the screen 170. Projection lens (not shown).

The image control circuit 180 receives an image signal corresponding to one frame and controls the 1D optical modulator element 130 and the scanner 150 according to the image signal.

The image control circuit 180 converts the light intensity information (that is, the light intensity) of each pixel constituting the frame into an optical modulator control signal and transmits it to the one-dimensional optical modulator element 130, and the one-dimensional optical modulator element 130. Correspondingly, the scanner control signal for adjusting the rotational angle of the scanner 150 is also output in synchronization with the optical modulator control signal transmitted to) so that the vertical scan line is properly projected on the screen 170. In the present invention, when the plurality of vertical scan lines corresponding to one frame are all the same, the scanner control signal may be a signal that causes the scanner 150 to rotate at a predetermined angular velocity.

Here, the image control circuit 180 extracts input light intensity information from the image signal. The input light intensity information is converted into reference light intensity information according to a conversion method to be described later, and an optical modulator control signal corresponding to the reference light intensity information is generated and transmitted to the 1D optical modulator device 130.

In the present invention, the one-dimensional optical modulator device 130 includes a driving integrated circuit and a plurality of micro mirrors 20. The driving integrated circuit generates a plurality of driving voltages for changing displacements of the plurality of micromirrors 20 according to the optical modulator control signals applied from the image control circuit 180, and transmits the plurality of driving voltages to the micromirrors 20. Here, the optical modulator control signal includes reference light intensity information.

7 is a flowchart of a color image control method according to an exemplary embodiment of the present invention, and FIG. 8 is a driving voltage V, displacement H and brightness of the micromirror 20 in the one-dimensional optical modulator element 130. It is a graph which shows the relationship of (I).

Referring to FIG. 7, a color image control method according to an exemplary embodiment of the present invention is as follows.

In operation S710, the image control circuit 180 receives an image signal including input light intensity information.

In step S720, input light intensity information is extracted from the video signal.

In step S730, the input light intensity information is converted into reference light intensity information by adjusting the gamma parameter.

In step S740, the reference light intensity information is applied to the optical modulator control signal and applied to the one-dimensional optical modulator element 130, and accordingly, the one-dimensional optical modulator 130 modulates the incident color light to generate a modulated beam that is diffracted light. Then, it is projected on the screen 170 through the scanner 150.

In this case, a method for obtaining a conversion equation or a reference table for converting input light intensity information into reference light intensity information in step S730 will be described with reference to FIG. 8.

Referring to the left graph of FIG. 8, the displacement H and the driving voltage V of the micromirror 20 are proportional to each other in relation to the linear function. That is, the formula (510) is satisfied that H = KV. That is, when the driving voltage V applied to both piezoelectric elements 15 of the micromirror 20 increases, the vertical displacement of the micromirror 20 also increases in proportion.

Referring to the right graph of FIG. 8, it can be seen that the displacements H of the plurality of micromirrors 20 and the brightness I of the modulated beam are in a relationship between cosine functions 520a and 520b.

The cosine function is shown in Equation 1 below.

Where I is the brightness of the modulation beam, I _o is the average brightness of the modulation beam (i.e. 1/2 of the maximum value), λ is the wavelength of the modulation beam, H is the displacement variation of the micromirror 20 due to the driving voltage, H _o is the initial displacement of the micromirror 20. -Is the case where the modulated beam is zero-order diffracted light, and + is the case where the modulated beam is ± first-order diffracted light.

As shown in FIG. 4, the micromirror 20 is spaced apart from the upper reflective layer 4a and the lower reflective layer 2a by a predetermined interval during initial fabrication. This gap is H _{o which} is the initial displacement of the micromirror 20. Then, when the driving voltage is applied, the micromirror 20 changes the displacement in the upward or downward direction, and the amount of change of the displacement is referred to as H. Here, H has a positive value when the change in the upward direction and a negative value when the change in the downward direction.

The reflected beam from the upper reflection layer (4a) and the spacing between the lower reflection layer (2a) is a H + H _o, the beam and the lower reflection layer (2a) reflected by the upper reflection layer (4a) according to the displacement variation of a micro mirror (20) The path difference between them becomes 2 × (H + H _o ).

Therefore, when the modulated beam to be used is zero-order diffracted light, the brightness when the path difference is an odd multiple of λ / 2 becomes maximum (that is, Imax), and the brightness when the path difference is an even multiple of λ / 2 is minimum (that is, , Imin = 0). Alternatively, when the modulated beam to be used is ± 1st order diffracted light, the brightness when the path difference is an even multiple of λ / 2 becomes maximum (that is, Imax), and the brightness when the path difference is an odd multiple of λ / 2 is minimum (that is, , Imin = 0).

According to the graph shown in FIG. 8, the relationship between the driving voltage and the displacement of the micromirror 20 has a linear (ie, linear function) relationship, and the relationship between the displacement of the micromirror 20 and the brightness of the modulation beam. Has a relationship between a sinusoidal cosine function as shown in Equation 1 above. Therefore, when the correlation is connected, the relationship between the driving voltage V and the brightness I of the modulation beam has a sinusoidal cosine function.

Here, the reference light intensity information input from the image control circuit 180 to the driving integrated circuit of the one-dimensional optical modulator element 130 includes reference light intensity for making the color light of the light source 110 have various brightnesses.

When the driving integrated circuit is designed such that the relationship between the light intensity information and the driving voltage has a linear function, as shown in FIG. 2A, the brightness of the light intensity information versus the modulation beam is shown in FIG. It will have a relationship as shown in. The image control circuit 180 transmits the light intensity information that has been digitally preprocessed to the one-dimensional optical modulator device 130 to have an arbitrary luminance characteristic.

The luminance characteristic of the input light intensity information included in the image signal is generally expressed by Equation 2 below.

는 휘도 특성인 감마 변수를 의미한다. Where I is the brightness of the modulation beam, B _input is the input light intensity information,

Denotes a gamma variable that is a luminance characteristic.

을 변화시킴에 따라 입력 광강도 정보(B_input)과 변조빔의 밝기(I) 간의 관계는 다양해지며, 상기 수학식 2의 관계를 만족시키도록 한다면 임의 의 휘도 특성을 가지는 투사 영상을 얻을 수 있게 된다. Gamma variable

The relation between the input light intensity information (B _input ) and the brightness (I) of the modulation beam is varied according to the change of, and if the relation of Equation 2 is satisfied, a projection image having an arbitrary luminance characteristic can be obtained. do.

The image control circuit 180 converts input light intensity information extracted from the image signal into reference light intensity information. The reference light intensity information refers to light intensity information, that is, reference light intensity, which is used as an input of a driving integrated circuit having a characteristic of a primary function to obtain a linear driving voltage. The reference light intensity is a value whose relationship with the driving voltage is predetermined so that a specific driving voltage is obtained when fabricating the driving integrated circuit. In the present invention, there is a relationship between the primary functions.

)가 반영될 수 있도록 한다. Therefore, the input light intensity information extracted from the video signal is converted into reference light intensity information for applying to the driving integrated circuit. For these transformations, any gamma variable you want (

) Can be reflected.

The relationship between the input light intensity information extracted from the image signal and the reference light intensity information included in the optical modulator control signal for applying to the driving integrated circuit is expressed by Equation 3 below.

는 감마 변수,

을 의미한다. +는 스캐닝 컬러 디스플레이 장치에서 이용하는 변조빔 이 0차 회절광인 경우이고, -는 ±1차 회절광인 경우이다. This is a combination of Equations 1 and 2, where B _std is reference light intensity information, B _input is input light intensity information, N is resolution of reference light intensity information,

Is the gamma variable,

Means. + Is the case where the modulated beam used in the scanning color display device is the 0th order diffracted light, and-is the case where ± 1st order diffraction light is used.

The resolution of the reference light intensity information generally means the degree of division between the darkest value and the brightest value. The resolution of the reference light intensity information is preferably higher than the resolution of the input light intensity information. For example, if the input light intensity information has a resolution of ⁸ bits, that is, 256 (= 2 ⁸ ), it is possible to distinguish from 0 to 255, and the reference light intensity information is 10 bits, that is, 0 to 1023. It can have a resolution of 1024 (= 2 ¹⁰ ) that can be distinguished up to. This is because the resolution of the reference light intensity information must be higher than the resolution of the input light intensity information in order to maintain the accuracy of the driving voltage output from the driving integrated circuit of the 1D optical modulator device 130. This will be described in detail with reference to FIG. 11 to be described later.

In Equation 1, the relationship between the driving voltage V and the brightness I of the modulation beam has a cosine function, and in Equation 2, the brightness I and the input light intensity information B _input of the modulation beam are an exponential function. Has a relationship with In addition, since the driving voltage V and the reference light intensity information B _std have a linear function relationship due to the linear characteristics of the driving integrated circuit, the input light intensity information B _input and the reference light intensity information shown in Equation 3 above are used. The relationship between (B _std ) holds.

When the above equation (3) is summarized with respect to the reference light intensity information (B _std ), the relationship as shown in the following equation (4) is established.

Here, + is a case where the modulation beam used in the scanning color display device is 0th order diffracted light, and − is a case where ± 1st order diffraction light is used.

Accordingly, the input light intensity information may be converted into reference light intensity information so as to have a relation as shown in Equation 4, and then the reference light intensity information may be loaded on the optical modulator control signal and transmitted to the one-dimensional optical modulator element 130. .

Since the conversion of the input light intensity information and the reference light intensity information is as defined in Equation 4, the image control circuit 180 is configured to convert the input light intensity information and the reference light intensity information in the form of a lookup table. The transformation relationship may be stored in advance. When stored in the form of a reference table, the reference light intensity information may be quickly searched and converted in response to the input light intensity information, and the preprocessing operation in the image control circuit 180 may be omitted, thereby increasing the reaction speed.

In the present invention, when the relationship between the brightness I of the modulation beam and the input light intensity information B _input is defined in addition to the exponential function as shown in Equation 2, the relation of other function types is defined. Therefore, the projection image having various luminance characteristics can be represented.

9 is a graph illustrating a conversion relationship reflecting various gamma variables between input light intensity information and reference light intensity information according to an exemplary embodiment of the present invention. In this example, it is assumed that the input light intensity information has a resolution of 8 bits, and the reference light intensity information has a resolution of 10 bits. However, it is a matter of course that the input light intensity information has only a different resolution. It is advantageous for the reference light intensity information to have a higher resolution than the input light intensity information to increase the accuracy of the driving voltage output from the driving integrated circuit of the one-dimensional optical modulator element 130.

Corresponding graphs 910, 920, 930, and 940 between reference light intensity information to which gamma variables 1.2, 1.5, 1.8, and 2.0 are applied and input light intensity information according to Equation 4 described above. The input light intensity information included in the image signal is converted into reference light intensity information according to one of the corresponding graphs, and applied to the one-dimensional optical modulator device 130 to express a color image having a desired luminance characteristic.

10 is a diagram illustrating a brightness curve of a modulation beam compared to input light intensity information according to the present invention. Here, the driving integrated circuit has a linear gray scale voltage characteristic that outputs a driving voltage in proportion to the reference light intensity information included in the applied optical modulator control signal.

Referring to FIG. 10, three brightness levels of a modulation beam according to input light intensity information are illustrated. If the pretreatment according to the present invention is not performed, it will have a curve 1010 having the same arc cosine shape as shown in FIG. When the gamma variable is set to 1, the gamma variable has a parabolic curve 1020 similar to a quadratic function. In the case where the gamma variable is set to 2.2, the input light intensity information and the brightness of the modulation beam have a linear function 1030 having a linear function, indicating the most optimal luminance characteristic. In addition, by varying the gamma variable, it is possible to have a brightness curve of the modulation beam compared to various types of input light intensity information.

In the present invention, the image control circuit 180 includes a method of converting the above-described input light intensity information into reference light intensity information, and generates an optical modulator control signal and a scanner control signal to generate the one-dimensional optical modulator element 130 and the scanner. It may include a recording medium on which a computer readable and executable code is recorded, which carries out the method for controlling 150.

As described above, the scanning color display apparatus, the color image control method, and the color image control recording medium according to the present invention perform a digital preprocessing operation on an input signal through a driving integrated circuit having a linear configuration of driving voltage versus light intensity. As a result, the relationship between the amount of light and the input signal can be converted into an arbitrary nonlinear relationship.

In addition, it is possible to easily change the luminance characteristic of the projection image represented by the one-dimensional optical modulator element to a gamma curve of a user's preferred form.

In addition, a lookup table may be used to quickly preprocess the input signal digitally.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art that various modifications of the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below It will be appreciated that modifications and variations can be made.

Claims (21)

Light source; A one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with the color light emitted from the light source according to an optical modulator control signal; A scanner for projecting the modulated beam to a predetermined position on a screen according to a scanner control signal; And Receiving an image signal, converting input light intensity information extracted from the image signal into reference light intensity information having a gamma variable adjusted, and the color light is modulated by a 1D optical modulator device according to the reference light intensity information, and the scanner An image control circuit for projecting on the screen through the, And the input light intensity information and the reference light intensity information are light intensities of respective pixels constituting the one-dimensional scan line, respectively. delete The method of claim 1, The one-dimensional optical modulator device, A driving integrated circuit generating a driving voltage according to the optical modulator control signal; And A plurality of micro mirrors to generate the modulated beam by modulating the beam incident by the displacement that changes according to the drive voltage Scanning color display device comprising a. The method of claim 3, And the driving voltage is proportional to the reference light intensity information. The method of claim 4, wherein And the displacement of the micro mirror is changed in proportion to the driving voltage. The method of claim 5, And a relationship between the brightness of the modulated beam and the displacement caused by the micromirror is represented by a cosine function. Where the cosine function

I is the brightness of the modulation beam, I _o is the average brightness of the modulation beam, λ is the wavelength of the modulation beam, H is the amount of displacement change by the driving voltage, H _o is the initial displacement of the micromirror, + The sign is the case where the modulated beam is zero-order diffracted light, and the sign is the case where the modulated beam is ± first-order diffracted light. The method of claim 6, And the relationship between the reference light intensity information and the input light intensity information is represented by an inverse function of the cosine function. Where the inverse is

B _std is reference light intensity information, B _input is input light intensity information, N is resolution of the reference light intensity information,

Is the gamma variable,

Where + is the case where the modulation beam is 0th order diffracted light, and + is the case where the modulation beam is ± 1st order diffraction light. Light source; A one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with the color light emitted from the light source according to an optical modulator control signal; A scanner for projecting the modulated beam to a predetermined position on a screen according to a scanner control signal; And Receiving an image signal, converting input light intensity information extracted from the image signal into reference light intensity information having a gamma variable adjusted, and the color light is modulated by a 1D optical modulator device according to the reference light intensity information, and the scanner An image control circuit for projecting on the screen through the, The image control circuit has a look up table storing a correspondence relationship between the input light intensity information and the reference light intensity information according to the gamma variable, and by the reference table from the input light intensity information And a conversion to reference light intensity information. Light source; A one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with the color light emitted from the light source according to an optical modulator control signal; A scanner for projecting the modulated beam to a predetermined position on a screen according to a scanner control signal; And Receiving an image signal, converting input light intensity information extracted from the image signal into reference light intensity information having a gamma variable adjusted, and the color light is modulated by a 1D optical modulator device according to the reference light intensity information, and the scanner An image control circuit for projecting on the screen through the, And the resolution of the reference light intensity information is better than the resolution of the input light intensity information. Light source; A one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with the color light emitted from the light source according to an optical modulator control signal; A scanner for projecting the modulated beam to a predetermined position on a screen according to a scanner control signal; And Receiving an image signal, converting input light intensity information extracted from the image signal into reference light intensity information having a gamma variable adjusted, and the color light is modulated by a 1D optical modulator device according to the reference light intensity information, and the scanner An image control circuit for projecting on the screen through the, And the gamma parameter is adjustable. An image of a scanning color display device including a light source, a one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with color light emitted from the light source, and a scanner for projecting the modulated beam to a predetermined position on a screen; In the control method, (a) receiving an image signal including input light intensity information on the color light; (b) extracting the input light intensity information from the video signal; (c) converting the input light intensity information into reference light intensity information whose gamma parameter is adjusted; And (d) causing the one-dimensional light modulator element to modulate the color light according to the reference light intensity information and to project it onto the screen through the scanner, And wherein the light intensity information and the reference light intensity information are light intensities of respective pixels constituting the one-dimensional scan line, respectively. delete The method of claim 11, The one-dimensional optical modulator device, A driving integrated circuit generating a driving voltage according to the optical modulator control signal; And A plurality of micro mirrors to generate the modulated beam by modulating the beam incident by the displacement that changes according to the drive voltage Color image control method comprising a. The method of claim 13, And the driving voltage is proportional to the reference light intensity information. The method of claim 14, And the displacement of the micro mirror is changed in proportion to the driving voltage. The method of claim 15, The relationship between the brightness of the modulation beam and the displacement by the micro mirror is represented by a cosine (cosine) function. Where the cosine function

I is the brightness of the modulation beam, I _o is the average brightness of the modulation beam, λ is the wavelength of the modulation beam, H is the amount of displacement change by the driving voltage, H _o is the initial displacement of the micromirror, + The sign is the case where the modulated beam is zero-order diffracted light, and the sign is the case where the modulated beam is ± first-order diffracted light. The method of claim 16, And the relationship between the reference light intensity information and the input light intensity information is represented by an inverse function of the cosine function. Where the inverse is

B _std is reference light intensity information, B _input is input light intensity information, N is resolution of the reference light intensity information,

Is the gamma variable,

Where + is the case where the modulation beam is 0th order diffracted light, and + is the case where the modulation beam is ± 1st order diffraction light. An image of a scanning color display device including a light source, a one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with color light emitted from the light source, and a scanner for projecting the modulated beam to a predetermined position on a screen; In the control method, (a) receiving an image signal including input light intensity information on the color light; (b) extracting the input light intensity information from the video signal; (c) converting the input light intensity information into reference light intensity information whose gamma parameter is adjusted; And (d) causing the one-dimensional light modulator element to modulate the color light according to the reference light intensity information and to project it onto the screen through the scanner, In step (c), the conversion of the input light intensity information to the reference light intensity information is performed by a reference table storing a correspondence relationship between the input light intensity information and the reference light intensity information according to the gamma variable. Color image control method characterized in that. An image of a scanning color display device including a light source, a one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with color light emitted from the light source, and a scanner for projecting the modulated beam to a predetermined position on a screen; In the control method, (a) receiving an image signal including input light intensity information on the color light; (b) extracting the input light intensity information from the video signal; (c) converting the input light intensity information into reference light intensity information whose gamma parameter is adjusted; And (d) causing the one-dimensional light modulator element to modulate the color light according to the reference light intensity information and to project it onto the screen through the scanner, And the resolution of the reference light intensity information is higher than the resolution of the input light intensity information. An image of a scanning color display device including a light source, a one-dimensional optical modulator element for generating a modulated beam of one-dimensional scan line modulated with color light emitted from the light source, and a scanner for projecting the modulated beam to a predetermined position on a screen; In the control method, (a) receiving an image signal including input light intensity information on the color light; (b) extracting the input light intensity information from the video signal; (c) converting the input light intensity information into reference light intensity information whose gamma parameter is adjusted; And (d) causing the one-dimensional light modulator element to modulate the color light according to the reference light intensity information and to project it onto the screen through the scanner, And the gamma variable is adjustable. 21. A color image control recording medium in which a computer readable and executable code is recorded which performs the color image control method according to any one of claims 11 and 13.

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