JP3783465B2 - Color unevenness correction method, color unevenness correction device, color unevenness correction circuit, display device, and information recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color unevenness correction method, a color unevenness correction device, a color unevenness correction circuit, a display device, and an information recording medium, and more particularly to a technique for suppressing color unevenness that occurs in an optical display such as a projection display device.
[0002]
[Prior art]
In recent years, projection screens of color projection display devices have been increasing in size. With the increase in the size of the projection screen, there is a problem that color unevenness occurs in the display image on the projection screen. As a cause of such color unevenness, there is a variation in the projection light source, the image generation device (light valve), and the like. Conventionally, as a method for correcting defects in a display image in a whole display device including a projection display device, a method described below has been considered.
[0003]
That is, as one of the correction methods of the display image, for example, after detecting a singular point in the display image using an imaging unit, the correction value is calculated by comparing the optical data of the singular point with the reference level, There is a method of correcting the display device based on the correction value.
[0004]
Another method for correcting the display image is as follows. First, a video signal with a constant luminance level is input, an image is projected onto an image display surface (screen), the luminance level is measured for each region obtained by dividing the image display surface into a grid, and the measurement level and DC difference data from the reference level is recorded in the memory as brightness correction data. This memory is incorporated in the luminance correction circuit. The correction data is read out by calculating the memory address corresponding to the rectangular screen area divided at the time of luminance measurement from the horizontal and vertical synchronizing signals of the input image signal. The correction data is converted into an analog value by the D / A conversion circuit, and an image signal obtained by adding the analog correction value to the input image signal using the addition circuit is output to the display device side. At this time, for example, a liquid crystal display element serving as a light valve constituting the projection display device performs display driving corrected based on the above-described image signal. In this way, luminance unevenness and color unevenness on the image display surface are corrected.
[0005]
[Problems to be solved by the invention]
However, in the former case, even if it is possible to detect a part that is clearly different in brightness and color from other display parts, such as a singular point in a display image due to pixel defects or the like, Color unevenness was not detected. For this reason, this method cannot correct color unevenness.
[0006]
In the latter case, although it is possible to perform correction for each area obtained by dividing the image display surface in a grid pattern, it is impossible to perform correction in every detail in each area.
[0007]
By the way, in a three-plate type liquid crystal projector as a projection display device, red (R), green (G), and blue (B) light is projected onto a screen through three liquid crystal light valves. The images are displayed by combining them. In such a liquid crystal projector device, color unevenness occurs in the optical display (display image) due to variations in image generation surfaces of the respective liquid crystal light valves and variations in emitted light of the optical system on the light source side. This color unevenness is an area where the color gradually changes within the area in the optical display, and its generation mechanism is compared with the color singularity caused by the pixel defect that determines the good / bad of the liquid crystal light valve. Different.
[0008]
The present invention can appropriately determine a correction amount of color unevenness of a display image and can perform appropriate correction over details of the display image, a color unevenness correction method, a color unevenness correction device, a color unevenness correction circuit, It is an object to obtain a display device and an information recording medium.
[0009]
[Means for Solving the Problems]
Accordingly, the present invention provides a method for correcting color unevenness of a display color on an optical display surface on which a color image generated by an image generation unit of a display device is displayed, wherein reference color image data is input to the image generation unit. The optical display surface on which a reference color image is displayed is partitioned into a plurality of triangular areas, color coordinates at reference pixels located at three vertices of each of the triangular areas are measured, and a luminance correction amount at the reference pixels And determining the luminance correction amount at each pixel in each of the triangular regions according to a predetermined function based on the luminance correction amounts at the three reference pixels in each of the triangular regions, and the image generating unit The color image data corresponding to each of the pixels in each of the triangular areas is corrected according to the luminance correction amount.
[0010]
According to this configuration of the present invention, the luminance correction amount at the reference pixel can be determined by measuring the color coordinates at the reference pixel located at the three vertices of the triangular area defined on the optical display surface. Based on the luminance correction amount at the reference pixel, the luminance correction amount of an arbitrary pixel in each triangular area can be obtained by a predetermined function such as linear interpolation. Further, by dividing the optical display surface into triangular regions, there is an effect that the luminance correction amount can be easily calculated over the details. Then, by correcting the color image data input to the image generation unit based on these luminance correction amounts, specifically, by multiplying the color image data by the luminance correction amount, color unevenness occurs in the display image. There is an effect that it can be suppressed.
[0011]
In the color unevenness correction method of the present invention, the luminance correction amounts at the reference pixels located at the three vertices of the triangular area are set to the color coordinates measured by the reference pixels as the preset color coordinates or all the reference values. It is preferable that the correction value is set so as to match the average value of the color coordinates of the pixels.
[0012]
In the present invention having such a configuration, since luminance correction can be performed using an index called color coordinates, there is an advantage that correction control can be easily performed.
[0013]
Furthermore, in the color unevenness correction method of the present invention, it is preferable that the luminance correction amount is set by adjusting at least the red (R) component and the blue (B) component. In particular, the luminance correction amount is set by adjusting the two color components of red (R) and blue (B), so that red (R) and blue (B) excluding green, which easily affects color mixture, Since the correction can be performed with this, there is an effect that the correction control is facilitated.
[0014]
Further, in the color unevenness correction method of the present invention, the luminance correction amount (Z) represents a function having the variables of the coordinate position in the X direction and the coordinate position in the Y direction on the optical display surface: Z = aX + bY + c However, it is preferable to obtain by (where a, b, and c are coefficients).
[0015]
In the present invention having such a configuration, it is possible to derive the luminance correction amount (Z) by the simple arithmetic expression as described above according to the coordinates X and Y positions on the optical display surface, and the correction control is facilitated. There is an effect of becoming.
[0016]
The present invention relates to a method for correcting color unevenness of a display color displayed on an optical display surface on which a color image generated by an image generation unit of a display device is displayed. Reference color image data is input to the image generation unit. A plurality of specific pixels are determined on the optical display surface for displaying the reference color image, the color coordinates at these specific pixels are measured, one specific pixel is used as the reference pixel, and the color coordinate deviation between the specific pixels is minimized. Alternatively, the luminance correction amount is sequentially adjusted from the specific pixel in the vicinity of the reference pixel so as to be near the minimum, and the luminance correction amount at an arbitrary pixel between the specific pixels is changed to the luminance correction amount at the specific pixel. The color image data obtained by linear interpolation based on the color image data input to the image generation unit is corrected according to the luminance correction amount.
[0017]
According to such a configuration of the present invention, one reference pixel is fixed, and the luminance correction amount at each specific pixel in the vicinity of the reference pixel can be obtained sequentially. In addition, there is an effect that it is easy to minimize the color coordinate deviation between specific pixels adjacent to each other.
[0018]
In the color unevenness correction method of the present invention, the luminance correction amount is preferably set by adjusting the blue (B) component.
[0019]
In the present invention having such a configuration, it is possible to perform a gentle adjustment on the color coordinates by performing the adjustment using blue (B) that has little adverse effect on the color mixing. Such a gentle color change is difficult to recognize visually, so that effective color unevenness correction can be performed.
[0020]
Further, according to the color unevenness correction method of the present invention, a plurality of reference color images having different gradations are displayed on the optical display surface, and the color coordinates at the reference pixels or specific pixels at each gradation are measured. It is preferable to obtain the luminance correction amount at the reference pixel or the specific pixel every time.
[0021]
In the present invention having such a configuration, since the color coordinates in the reference pixel are measured for each of a plurality of different gradations, a display image without color unevenness can be obtained over a wide gradation width.
[0022]
In the color unevenness correction method of the present invention, color unevenness can be corrected effectively when the display device is a projection display device. In the projection display device, as the projection screen increases in size, there is a disadvantage that uneven color occurs in the display image. By applying the uneven color correction method of the present invention, a light valve or a color light source is applied. Even when there is a cause of occurrence of color unevenness, the effect of effectively suppressing the occurrence of color unevenness is achieved.
[0023]
The present invention is a color unevenness correction device for display colors on an optical display surface on which a color image generated by an image generation unit of a display device is displayed, and a reference color image data is input to the image generation unit as a reference The optical display surface on which the color image is displayed is divided into a plurality of triangular areas, and three determined based on the result of measuring the color coordinates of the reference pixels located at the three vertices of the triangular areas. A memory unit that stores in-region correction data obtained based on a luminance correction amount at the reference pixel, a region determination unit that determines which triangular region the color image data corresponds to, and the image Based on the area data of the area determination unit, the color image data corresponding to the pixels input to the generation unit corresponds to the luminance correction amount obtained using the in-area correction data read from the memory unit. And brightness correction control unit for correcting the, characterized in that it comprises a.
[0024]
According to such a configuration of the present invention, the luminance correction amount at the reference pixel is measured by measuring the position on the color coordinate at the reference pixel located at the three vertices of the triangular area defined on the optical display surface. Can be determined. The in-region correction data obtained from the luminance correction amount at the reference pixel is stored in the memory unit. Based on the luminance correction amount at the reference pixel, the luminance correction amount of an arbitrary pixel in each triangular area can be obtained by a predetermined function such as linear interpolation. Further, by dividing the optical display surface into triangular regions, there is an effect that the luminance correction amount can be easily calculated over the details. Then, the luminance correction control unit corrects the color image data input to the image generation unit according to the luminance correction amount calculated from the in-region correction data stored in the memory unit. By multiplying the color image data by the color image data, it is possible to suppress the occurrence of color unevenness in the display image.
[0025]
In the color unevenness correction apparatus of the present invention, the luminance correction amount (Z) is an arithmetic expression representing the function with the coordinate position in the X direction and the coordinate position in the Y direction on the optical display surface as variables, Z = aX + bY + c ( However, a, b, and c are preferably obtained as coefficients.
[0026]
In the present invention having such a configuration, it is possible to derive the luminance correction amount (Z) by the simple arithmetic expression as described above according to the coordinates X and Y positions on the optical display surface, and the correction control is facilitated. There is an effect of becoming.
[0027]
Furthermore, in the color unevenness correction apparatus of the present invention, a nonvolatile semiconductor memory device can be used as the memory unit. In the color unevenness correction apparatus of the present invention, the in-region correction data is coefficient data corresponding to the coefficients a, b, and c, and the brightness correction control unit is specific to the triangular region according to the determination of the region determination unit. The luminance correction amount is calculated based on the a register, b register, and c register for fetching the coefficient data, the coefficient data read from the a register, b register, and c register and the address information of the color image data. It is preferable to include multiplication means for multiplying the color image data.
[0028]
In the present invention having such a configuration, it is determined which triangular region the pixel belongs to, the coefficients a, b, and c are selected, and the luminance correction amount is calculated according to the arithmetic expression, Z = aX + bY + c. It is only necessary to store coefficient data corresponding to the coefficients a, b, and c in the triangular region. For this reason, there is an advantage that a memory unit having a small storage capacity can be used.
[0029]
The present invention is a color unevenness correction circuit for a display color displayed on an optical display surface on which a color image generated by an image generation unit of a display device is displayed, and inputs reference color image data to the image generation unit The optical display surface on which the reference color image is displayed is divided into a plurality of triangular areas, and is determined based on the result of measuring the color coordinates of the reference pixels located at the three vertices of the triangular areas. In addition, a storage circuit unit that stores in-area correction data obtained from reference luminance correction amounts at the three reference pixels, and an area for determining which of the triangular areas the color image data corresponds to The color image data corresponding to the pixel input to the determination circuit unit and the image generation unit is obtained using the intra-region correction data read from the storage circuit unit based on the region data of the region determination circuit unit. A brightness correction control circuit unit which performs correction according to the luminance correction amount which is characterized in that it comprises a.
[0030]
According to this configuration of the present invention, the luminance correction amount at the reference pixel can be determined by measuring the color coordinates at the reference pixel located at the three vertices of the triangular area defined on the optical display surface. Based on the luminance correction amount at the reference pixel, the luminance correction amount of an arbitrary pixel in each triangular area can be obtained by a predetermined function such as linear interpolation. Further, by dividing the optical display surface into triangular regions, there is an effect that the luminance correction amount can be easily calculated over the details. Then, by correcting the color image data input to the image generation unit in accordance with these luminance correction amounts, specifically, by multiplying the color image data by the luminance correction amount, color unevenness occurs in the display image. There is an effect that can be suppressed.
[0031]
Further, in the color unevenness correction circuit of the present invention, the luminance correction amount (Z) is expressed by the following equation, Z = aX + bY + c (), which represents a function having the X-direction coordinate position and the Y-direction coordinate position as variables on the optical display surface. However, a, b, and c are preferably obtained as coefficients.
[0032]
In the present invention having such a configuration, it is possible to derive the luminance correction amount (Z) by the simple arithmetic expression as described above according to the coordinates X and Y positions on the optical display surface, and the correction control is facilitated. There is an effect of becoming.
[0033]
Furthermore, in the color unevenness correction circuit of the present invention, it is preferable that the memory unit is a nonvolatile semiconductor memory device.
[0034]
In the color unevenness correction circuit of the present invention, the intra-area correction data is coefficient data corresponding to a coefficient, and the luminance correction control circuit outputs coefficient data specific to the triangular area according to the determination of the area determination circuit unit. A luminance correction amount is calculated based on the a register, b register, and c register to be fetched, coefficient data read from the a register, b register, and c register and address information of the color image data, and the luminance correction amount is converted into color image data. And a multiplying circuit unit for multiplying.
[0035]
In the present invention having such a configuration, it is determined which triangular region the pixel belongs to, the coefficients a, b, and c are selected, and the luminance correction amount is calculated according to the arithmetic expression, Z = aX + bY + c. It is only necessary to store coefficient data corresponding to the coefficients a, b, and c in the triangular region. For this reason, there is an advantage that a memory unit having a small storage capacity can be used.
[0036]
The present invention is a display device for displaying a color image generated by an image generation unit on an optical display surface, wherein the optical display surface for displaying a reference color image by inputting reference color image data to the image generation unit. It was obtained from the reference luminance correction amounts at the three reference pixels determined based on the color coordinates at the reference pixels located at the three vertices of each of the triangle areas, which are divided into a plurality of triangle areas. In accordance with a predetermined function based on the in-area correction data read out from the memory unit, the memory unit in which the in-area correction data is stored, the brightness correction amount at each pixel in each triangular area is calculated, Luminance correction control for correcting color image data corresponding to each of the pixels in each of the triangular regions input to the image generation unit in accordance with a reference luminance correction amount or the luminance correction amount Characterized in that it comprises a and.
[0037]
According to this configuration of the present invention, the luminance correction amount at the reference pixel can be determined by measuring the color coordinates at the reference pixel located at the three vertices of the triangular area defined on the optical display surface. Based on the luminance correction amount at the reference pixel, the luminance correction amount of an arbitrary pixel in each triangular area can be obtained by a predetermined function such as linear interpolation. Further, by dividing the optical display surface into triangular regions, there is an effect that the luminance correction amount can be easily calculated over the details. Then, by correcting the color image data input to the image generation unit in accordance with these luminance correction amounts, specifically, by multiplying the color image data by the luminance correction amount, color unevenness occurs in the display image. There is an effect that can be suppressed.
[0038]
In the display device of the present invention, the luminance correction amount at the reference pixel is set so that the color coordinate measured at the reference pixel matches the preset color coordinate or the average value of the color coordinates of all the reference pixels. It is preferable that the value to be corrected is set.
[0039]
In the present invention having such a configuration, since luminance correction can be performed using an index called color coordinates, there is an advantage that correction control can be easily performed.
[0040]
Furthermore, in the display device of the present invention, it is preferable that the luminance correction amount is set by adjusting at least the red (R) component and the blue (B) component. In particular, in the present invention, the luminance correction amount is set by adjusting the two color components of red (R) and blue (B), so that red (R) and blue except for green, which easily affects color mixture, are excluded. Since the correction can be performed in (B), there is an effect of facilitating the correction control.
[0041]
In the display device of the present invention, the luminance correction amount (Z) is an arithmetic expression representing the function with the coordinate position in the X direction and the coordinate position in the Y direction on the optical display surface as variables, Z = aX + bY + c (where a , B, and c are preferably obtained by coefficients).
[0042]
In the present invention having such a configuration, it is possible to derive the luminance correction amount (Z) by the simple arithmetic expression as described above according to the coordinates X and Y positions on the optical display surface, and the correction control is facilitated. There is an effect of becoming.
[0043]
The present invention is a display device for displaying a color image generated by an image generation unit of a display device on an optical display surface, wherein the optical for displaying a reference color image by inputting reference color image data to the image generation unit. A plurality of specific pixels are determined on the display surface, and one of the specific pixels is used as a reference pixel so that a color coordinate deviation between the specific pixels obtained by measuring the color coordinates of the specific pixels is minimum or near the minimum. Arbitrary pixels between the specific pixels obtained by sequentially adjusting the luminance correction amount data of the specific pixels near the reference pixel to obtain the luminance correction amount at the specific pixels, and obtained by linear interpolation based on the luminance correction amount Brightness correction amount data in the memory unit, a luminance correction control unit for correcting color image data input to the image generation unit according to the brightness correction amount data read from the memory unit, With And wherein the door.
[0044]
According to such a configuration of the present invention, one reference pixel is fixed, and the luminance correction amount at each specific pixel in the vicinity of the reference pixel can be obtained sequentially. In addition, there is an effect that it is easy to minimize the color coordinate deviation between specific pixels adjacent to each other. For this reason, in the present invention, color unevenness correction of a display image can be easily performed.
[0045]
In the display device of the present invention, it is preferable that the luminance correction amount is set by adjusting a blue (B) component.
[0046]
In the present invention having such a configuration, it is possible to perform a gentle adjustment on the color coordinates by performing the adjustment using blue (B) that has little adverse effect on the color mixing. Such a gentle color change is difficult to recognize visually, so that effective color unevenness correction can be performed.
[0047]
Further, in the display device of the present invention, the luminance correction amount is displayed on the optical display surface with a plurality of reference color images having different gradations, and the color coordinates of the reference pixels or specific pixels at the respective gradations are displayed. It is preferable that the position is measured and obtained for each gradation.
[0048]
In the present invention having such a configuration, since the color coordinates of the reference pixel are measured for each of a plurality of different gradations, a display image having no color unevenness can be obtained over a wide gradation width.
[0049]
In addition, the display device of the present invention is preferably a projection display device including three light valves as an image generation unit.
[0050]
In the present invention having such a configuration, it is possible to effectively correct color unevenness of a display image projected on a screen. In the projection display device, as the projection screen increases in size, there is a disadvantage that color unevenness occurs in the display image. By applying the present invention, the cause of color unevenness in the light valve and the color light source is generated. Even if there is, there is an effect that the occurrence of color unevenness can be effectively suppressed.
[0051]
Further, in the display device of the present invention, the light valve is preferably a liquid crystal panel. When the present invention is applied when the optical display surface is formed on the screen, the screen becomes the optical display surface, and the luminance correction amount for all the pixels is easily set by measuring the reference pixels on the screen. It becomes possible.
[0052]
The present invention is an information recording medium provided in a display device that displays a color image generated by an image generation unit on an optical display surface, and includes three triangular regions each having an optical display surface partitioned into a plurality of triangular regions. In order to calculate the luminance correction amount at any pixel in each triangular area based on the luminance correction amount at the reference pixel obtained from the result of measuring the position on the color coordinate of the reference pixel located at the vertex The correction data is stored.
[0053]
According to such a configuration of the present invention, correction data on the optical display surface for correcting color unevenness of the display device can be read at the time of correction. Further, the display image quality can be easily improved by incorporating the information recording medium into the display device including the image generation unit.
[0054]
The information recording medium of the present invention is preferably a nonvolatile semiconductor memory such as an EPROM or an EEPROM.
[0055]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, details of a color unevenness correction method, a color unevenness correction device, a color unevenness correction circuit, a display device, and an information recording medium according to the present invention will be described based on embodiments.
[0056]
(Embodiment 1)
In the first embodiment, the present invention is applied to a projection display device. First, the configuration of the projection display device 1 according to the first embodiment to which the present invention is applied will be described with reference to FIGS.
[0057]
The projection display device 1 is roughly configured by an image generation unit 10 that projects an image onto a projection screen 300 and a drive circuit unit 20 that outputs a drive signal to the image generation unit 10.
[0058]
First, the drive circuit unit 20 of the projection display device 1 of the present embodiment will be described. As shown in FIG. 1, the drive circuit unit 20 stores an area determination unit 21 to which a horizontal synchronization signal (HD), a vertical synchronization signal (VD), and a dot clock (DCLK) are input, and coefficient data to be described later. A memory 22, a register 23 to which coefficient data is input from the memory 22, a multiplication circuit 24 to which the output of the register 23 and digital image data are input, and a D / A to which a corrected image signal from the multiplication circuit 24 is input It is mainly composed of a converter 25 and an amplifier 26 that amplifies the corrected image signal analog-converted by the D / A converter 25. In the present embodiment, the color unevenness correction circuit 27 is configured by the area determination unit 21, the memory 22, the register 23, and the multiplication circuit 24. For simplicity, circuits and signals for controlling the image generation unit 10 are omitted.
[0059]
The digital image data is read from a frame memory (not shown) in which an image signal is written at a predetermined timing, and is input to the multiplication circuit 24. The register 23 includes an a register 23a, a b register 23b, and a c register 23c into which coefficient data of an expression representing a correction function described later is written as needed. The memory 22 stores coefficient data unique to a correction function in a triangular area to be described later. The area determination unit 21 determines an area according to the corresponding address information of the digital image data (using a horizontal synchronization signal, a vertical synchronization signal, a dot clock, etc.), and outputs an area determination signal for reading predetermined coefficient data in the memory 22 It is supposed to be.
[0060]
Here, how to obtain the coefficient data stored in the memory 22 will be described with reference to FIGS.
[0061]
First, in this embodiment, as shown in FIG. 2, the projection screen 300 is divided into eight triangular areas S1 to S8. In the partitioning method according to the present embodiment, the projection screen 300 is divided into four rectangles along two lines a and b orthogonal to each other in the Sx and Sy directions in the drawing so as to pass through the center of the projection screen 300. Each rectangle is divided into eight triangular regions S1 to S8 by dividing the rectangles by lines c, d, e, and f connecting the ends of the lines a and b.
[0062]
Then, an image signal generated as it is through the D / A converter 25 and the amplifier 26 is directly input to the image generation unit 10 as a predetermined reference digital image data, and the reference image is input from the image generation unit 10 to the projection screen 300. Project. Specifically, when a maximum of 256 gradations can be displayed on the projection screen 300, for example, a halftone (gray) of 128 gradations is uniformly projected as a reference image. In this state, the color coordinates of the pixels at the positions of the three vertices of the respective triangular areas S1 to S8 (hereinafter referred to as reference pixels) are measured. A known color coordinate measuring device can be used for this measurement. As shown in FIG. 2, for example, the color coordinates of the reference pixels P1, P2, and P4 corresponding to the three vertices are measured in the triangular region S1. Then, the luminance correction amounts at the reference pixels located at the three vertices of each triangular area are obtained. The luminance correction amount is set by adding correction for matching the color coordinates obtained from the reference pixel with a position on the color coordinates set in advance, or correction for matching the average value of the color coordinates of all the reference pixels.
[0063]
As shown in FIG. 3, a specific method for determining the luminance correction amount according to the present embodiment includes a red (R) component and a blue (red) so that the actually measured color coordinate at the reference pixel indicated by a black circle matches the target color coordinate. B) Component is adjusted. Note that the green (G) component is likely to have an influence on light synthesis, and thus is preferably adjusted using red and blue. In the present embodiment, when performing the adjustment to match the color coordinates of the reference pixel with the target color coordinates, the use of the UCS color system in which the color difference and the distance on the color coordinate are in a proportional relationship to some extent expresses the color difference. Suitable for Note that the UCS color system is generally displayed using Luv or Lu′v ′. When the actually measured color coordinates are obtained in the XYZ color system, it is converted into the UCS color system using the following formula.
[0064]
L = Y when using Luv
u = 4X / (X + 15Y + 3Z)
v = 6Y / (X + 15Y + 3Z)
From these equations,
u = 2x / (6y-x + 1.5)
v = 3y / (6y-x + 1.5)
Is guided. When using Lu'v '
u '= u
v '= 1.5v
Led by.
[0065]
FIG. 3 illustrates a correction operation for matching the uncorrected color coordinate at the reference pixel on the uv coordinate with the target color coordinate. By such an operation, the luminance correction amount at the reference pixel can be obtained. Note that the specific operation is performed by adjusting the red component and the blue component as described above.
[0066]
Further, the correction amount in the left and right Sx (X) direction, the up and down Sy (Y) direction and the arbitrary pixels belonging to an arbitrary triangular area shown in FIG. 2 on the projection screen 300 is set to the Sz (Z) direction perpendicular to Sx and Sy. Considering three-dimensional coordinates, since each triangular area includes three reference pixels, the correction amount Sz at an arbitrary location (pixel) in the triangular area is obtained by linear interpolation from the reference correction amounts at the three reference pixels. It becomes possible. Since the plane is represented by Sz = aSX + bSY + c (generally, Z = aX + bY + c), if the coefficients a, b, and c are obtained from the reference correction amounts of the above three reference pixels, The correction amount Sz at an arbitrary pixel is obtained by the above arithmetic expression.
[0067]
The data of the coefficients a, b, and c obtained in this way are stored in the memory 22 shown in FIG. The coefficient data is unique to each of the triangular areas S1 to S8.
[0068]
In the present embodiment, as shown in FIG. 1, based on the horizontal synchronization signal, the vertical synchronization signal, and the dot clock, the region determination unit 21 reads coefficient data specific to the triangular regions S1 to S8 from the memory 22 and registers 23 The operation of temporarily writing to is performed. The coefficient data is written prior to the data image data projected onto the triangular area to be corrected with the coefficient data, and the a register 23a of the register 23 is input at the timing when the digital image data signal is input to the multiplication circuit 24. The coefficient data signal from the b register 23b and the c register 23c is input to the multiplication circuit 24, and the digital image data is multiplied by the luminance correction amount Sz. Therefore, the digital image data reaches the image generation unit 10 as a signal that has been subjected to correction processing in the projected triangular area according to the address information. In the projection display device 1 of the present embodiment, the region determination unit 21, the memory 22, the register 23, and the multiplication circuit 24 constitute a color unevenness correction circuit or correction device. Further, as the memory 22, a nonvolatile semiconductor memory such as an EPROM or an EEPROM can be applied. The memory 22 may be set to be incorporated in the color unevenness correction circuit as an information recording medium in which coefficient data obtained by measurement for each lot of the product is stored when the projection display device 1 is shipped as a product. .
[0069]
In this embodiment, as shown in FIG. 2, the projection screen 300 as an optical display surface is divided into eight triangular areas S1 to S8. However, as long as the projection screen 300 is divided into triangular areas. However, the present invention is not limited to this.
[0070]
Next, the image generation unit 10 will be described.
[0071]
As shown in FIG. 4, the image generation unit 10 includes an illumination optical system 100, a color light separation optical system 200 including dichroic mirrors 210 and 212, reflection mirrors 222 and 224, an incident side lens 230, and a relay lens 232. A light guide optical system 220, a reflection mirror 218, three field lenses 240, 242, and 244, three liquid crystal light valves 250, 252, and 254, a cross dichroic prism 260, and a projection lens system 270. I have. The liquid crystal light valves 250, 252 and 254 include liquid crystal panels 250b, 252b and 254b, incident side polarizing plates 250a, 252a and 254a, and outgoing side polarizing plates 250c, 252c and 254c, respectively. The liquid crystal panels 250b, 252b, and 254b receive the respective color image data from the amplifier 26 of the drive circuit unit 20 described above. As described above, the image data for each color is subjected to correction for suppressing the occurrence of color unevenness by the color unevenness correction circuit 27.
[0072]
The illumination optical system 100 includes a light source 110 that emits a substantially parallel light beam, a first lens array 120, a second lens array 130, a superimposing lens 150, and a reflection mirror 160. The illumination optical system 100 is an integrator optical system for illuminating the effective areas of the liquid crystal panels 250b, 252b, and 254b, which are the illumination areas of the three liquid crystal light valves 250, 252, and 254.
[0073]
The light source 110 includes a light source lamp 112 as a radiation light source that emits a radial light beam, and a concave mirror 114 that emits radiation light emitted from the light source lamp 112 as a substantially parallel light beam. As the light source lamp, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is used.
[0074]
In the projection display device 10 having such a configuration, a substantially parallel light beam emitted from the light source 10 is divided into a plurality of partial light beams by the first and second lens arrays 120 and 130 constituting the integrator optical system. The The partial light beams emitted from the small lenses of the first lens array 120 are collected so that a light source image (secondary light source image) of the light source 110 is formed in the vicinity of the small lenses 132 of the second lens array 130. To be lighted. The partial light beam emitted from the secondary light source image formed in the vicinity of the second lens array 130 is superimposed on the effective area (display area) of the liquid crystal panels 250b, 252b, and 254b by the superimposing lens 150 while diffusing. . As a result, each liquid crystal panel 250b, 252b, 254b is illuminated.
[0075]
The color light separation optical system 200 includes two dichroic mirrors 210 and 212, and separates light emitted from the superimposing lens 150 into red (R), green (G), and blue (B) color light. have. The first dichroic mirror 210 transmits the red light component of the white light beam emitted from the illumination optical system 100 and reflects the blue light component and the green light component. The red light that has passed through the first dichroic mirror 210 is reflected by the reflection mirror 218, passes through the field lens 240, and reaches the liquid crystal light valve 250 for red light. The field lens 240 converts each partial light beam emitted from the second lens array 130 into a light beam parallel to the central axis (principal light beam). The same applies to the field lenses 242 and 244 provided in front of the other liquid crystal light valves.
[0076]
Of the blue light and green light reflected by the first dichroic mirror 210, the green light is reflected by the second dichroic mirror 212, passes through the field lens 242, and reaches the liquid crystal light valve 252 for green light. On the other hand, the blue light passes through the second dichroic mirror 212, passes through the incident side lens 230, the relay lens system (light guide optical system) 220, and further passes through the output side lens (field lens) 244 for blue light. The liquid crystal light valve 254 is reached. The reason why the relay lens system is used for blue light is that the length of the optical path of the blue light is longer than the length of the optical path of the other color light, thereby preventing a decrease in light use efficiency due to light diffusion or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 230 to the emission side lens 244 as it is.
[0077]
The liquid crystal light valve 250 includes an incident side polarizing plate 250a, a liquid crystal panel 250b, and an output side polarizing plate 250c. The incident-side polarizing plate 250a has its transmission axis set in the direction of s-polarized light, and transmits only s-polarized light in the incident light. The liquid crystal panel 250b modulates the polarization direction of the polarized light of the red light emitted from the incident side polarizing plate 250a according to the given image information (image signal). The emission-side polarizing plate 250c has its transmission axis set in the direction of p-polarized light, and transmits only p-polarized light out of the modulated light emitted from the liquid crystal panel 250b. Thereby, the liquid crystal light valve 250a has a function of forming an image by modulating incident light in accordance with given image information.
[0078]
The liquid crystal light valves 252 and 254 also include incident side polarizing plates 252a and 254a, liquid crystal panels 252b and 254b, and outgoing side polarizing plates 252c and 254c, respectively, and have the same functions as the liquid crystal light valve 250. . The cross dichroic prism 260 has a function as a color light combining unit that combines three color lights to form a color image.
[0079]
The incident-side polarizing plate 250 a of the red light liquid crystal light valve 250 is attached to the flat emission surface of the field lens 240. The emission side polarizing plate 250c is attached to the emission surface of the liquid crystal panel 250b. The liquid crystal panel 250b is arranged at a certain distance from the incident-side polarizing plate 250a.
[0080]
Similar to the liquid crystal light valve 250 for red light, the incident-side polarizing plate 252 a of the liquid crystal light valve 252 for green light is also attached to the flat emission surface of the field lens 242. In addition, the exit-side polarizing plate 252c is also attached to the exit surface of the liquid crystal panel 252b. Further, the liquid crystal panel 252b is also arranged at a certain distance from the incident-side polarizing plate 252a.
[0081]
The liquid crystal light valve 254 for blue light has a different configuration from the other liquid crystal light valves 250 and 252. The incident-side polarizing plate 254a of the blue light liquid crystal light valve 254 is a transparent plate that is disposed as far as possible from the liquid crystal panel 254b between the first distance between the liquid crystal panel 254b and the field lens 244. 246, for example, affixed to the exit surface of the glass plate. Similarly to the other liquid crystal light valves 250 and 254, the emission-side polarizing plate 254c of the blue light liquid crystal light valve 254 is attached to the emission surface of the liquid crystal panel 254b.
[0082]
In the cross dichroic prism 260, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in an approximately X shape at the interface of four right-angle prisms. These dielectric multilayer films combine the three color lights to form a combined light for projecting a color image.
[0083]
Thus, the combined light generated by the cross dichroic prism 260 is emitted in the direction of the projection lens system 270. The projection lens system 270 has a function as projection means for projecting the combined light onto the projection screen 300 as an optical display surface to display a color image.
[0084]
As described above, the projection display device 1 according to the first embodiment has been described. However, in the first embodiment, the reference pixels located at the three vertices of the triangular areas S1 to S8 defined on the projection screen 300 as an optical display surface. By measuring the color coordinates at, the luminance correction amount at the reference pixel can be determined. Based on the luminance correction amount at the reference pixel, the luminance correction amount of any pixel in each triangular area can be calculated using the function described above. Can be obtained. Moreover, by dividing the projection screen 300 into triangular regions, there is an effect that the luminance correction amount Sz can be easily calculated over the details. Then, by multiplying the color image data input to the image generation unit 10 by these luminance correction amounts, it is possible to suppress the occurrence of color unevenness in the display image.
[0085]
In the first embodiment, since luminance correction is performed using an index called color coordinates, there is an advantage that a correction amount calculation method is simplified and correction control can be easily performed.
[0086]
Further, in the first embodiment, the correction amount is adjusted by adjusting and setting the red (R) component and the blue (B) component, so that the correction control can be easily performed without using green that easily affects light synthesis. There is an effect that can be performed.
[0087]
(Variation 1 of Color Unevenness Correction Method of Embodiment 1)
FIG. 5 is a diagram illustrating a modification of the color unevenness correction method according to the first embodiment. When performing actual measurement of color coordinates at the reference pixel, there may be cases where stable measurement cannot be performed at the periphery of the projection screen 300. Therefore, measurement is performed using a plurality of pixels inside the periphery as measurement pixels, and P1 to P9 in FIG. Among them, the luminance correction amount of the reference pixel other than P5 at the center of the projection screen 300 is obtained by estimation from the actual measurement result of the measurement pixel. Based on the luminance correction amount at the reference pixel thus obtained, the correction amount at any pixel in the eight triangular regions S1 to S8 including P5 at the vertex is obtained in the same manner as in the first embodiment. The memory 22 for storing the coefficient data obtained by the first modification and other configurations are the same as those in the first embodiment.
[0088]
(Modification 2 of the color unevenness correction method of Embodiment 1)
FIG. 6 is a diagram illustrating a modification of the color unevenness correction method according to the first embodiment. In the second modification, measurement pixels P1 to P8 are set inside the periphery of the projection screen 300 in the same manner as the first modification described above, and the region located outside the measurement pixels other than the measurement pixel P5 is P1, Correction is applied using the same coefficient data as the region to which P3, P7, and P9 belong. Also in the second modification, the memory 22 for storing the obtained coefficient data and other configurations are the same as those in the first embodiment.
[0089]
(Embodiment 2)
FIG. 7 shows a projection type display apparatus showing Embodiment 2 of the display apparatus according to the present invention. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the projection display device 1 of this embodiment, the reference correction amount may be obtained by measuring the luminance at the reference pixel in the triangular area over a plurality of different gradations. In this way, it is possible to perform color unevenness correction of an image over a wide range of gradations.
[0090]
In the projection display device 1 according to the second embodiment, for each gradation obtained in the memory 22 as a result of measuring the color coordinates at the reference pixel in the triangular area over a plurality of different gradations. Unique coefficient data is stored in all the triangular areas S1 to S8. The register 23 includes a set of a register, b register, and c register, and a plurality of sets of a, b, c registers 23a1, 23b1, 23c1 to 23an, 23bn, and 23cn. Coefficient data specific to each triangular area S1 to S8 for each gradation can be written. Further, a gradation determination unit 28 that determines the gradation of the digital image data, and a selection circuit that selects a predetermined set of a, b, and c registers of the register 23 in accordance with the determination of the gradation determination unit 28. 29. The selection circuit 29 is configured to output the selected coefficient data to the multiplication circuit 24. In the present embodiment, the color unevenness correction circuit 27 is configured by the area determination unit 21, the memory 22, the register 23, the gradation determination unit 28, and the multiplication circuit 24. Other configurations in the second embodiment are the same as those in the first embodiment described above, and thus the description thereof is omitted.
[0091]
In the second embodiment, since the register 23 is set so as to be able to temporarily store a plurality (n sets) of a, b, and c coefficient data, the gradation determination unit 28 determines the gradation of the digital image data. In accordance with the result, the selection circuit 29 can supply coefficient data corresponding to the gradation of the digital image data to the multiplication circuit. As a result, the multiplication circuit 24 can multiply the digital image data by the correction amount. Other actions and operations of the second embodiment are substantially the same as those of the first embodiment.
[0092]
According to the second embodiment, the display image projected from the image generation unit 10 and formed on the projection screen 300 can be corrected to a display without color unevenness over a wide gradation width.
[0093]
(Embodiment 3)
FIG. 8 shows a third embodiment of the present invention and relates to another color unevenness correction method. In the present embodiment, for example, image data of a predetermined gradation is input to the image generation unit of the projection display device to display a reference image on the projection screen, and a plurality (9) of specific pixels P1 to P9 are determined on the projection screen. Then, the positions on the color coordinates of these specific pixels P1 to P9 are measured, and the luminance correction amount is determined using one specific pixel P1 as a reference pixel, and this is fixed. Then, the luminance correction amount is sequentially adjusted from the specific pixel near the reference pixel P1 so that the color coordinate deviation between the specific pixels is minimized, and the luminance correction amount at any pixel between the specific pixels is specified. It is obtained by linear interpolation based on the luminance correction amount in the pixels P1 to P9. Then, color unevenness correction is performed by multiplying the image data input to the image generation unit by the luminance correction amount.
[0094]
The color unevenness correction method of the third embodiment will be specifically described. First, specific pixels P1 to P9 as shown in FIG. 8 are set over substantially the entire display area of the projection screen. Then, using the specific pixel P1 as a reference pixel, the luminance correction values at specific pixels in the vicinity of the specific pixel P1 are sequentially adjusted to minimize the color coordinate deviation between adjacent specific pixels. As the adjustment procedure, for example, the following operation is performed.
[0095]
First, the correction value of the blue (B) component in the specific pixel P2 is adjusted so that the color coordinate deviation Δ12 between the specific pixel (reference pixel) P1 and the specific pixel P2 becomes small. Next, the correction value of the blue (B) component in the specific pixel P3 is adjusted so that the color coordinate deviation Δ23 between the specific pixel P2 and the specific pixel P3 becomes small. Subsequently, the correction value of the blue (B) component in the specific pixel P4 is adjusted so that the color coordinate deviation Δ14 between the specific pixel (reference pixel) P1 and the specific pixel P4 becomes small. Next, blue (B) at the specific pixel P5 is set so that the color coordinate deviation Δ25 between the specific pixel P2 and the specific pixel P5 and the color coordinate deviation Δ45 between the specific pixel P4 and the specific pixel P5 are reduced. Adjust the correction value of the component. Thereafter, the blue (B) component at the specific pixel P6 is reduced so that the color coordinate deviation Δ36 between the specific pixel P3 and the specific pixel P6 and the color coordinate deviation Δ56 between the specific pixel P5 and the specific pixel P6 are reduced. Adjust the correction value. Furthermore, the correction value of the blue (B) component at the specific pixel P7 is adjusted so that the color coordinate deviation Δ47 between the specific pixel P4 and the specific pixel P7 becomes small. Subsequently, blue (B) at the specific pixel P8 is set so that the color coordinate deviation Δ58 between the specific pixel P5 and the specific pixel P8 and the color coordinate deviation Δ78 between the specific pixel P7 and the specific pixel P8 are reduced. Adjust the correction value of the component. Finally, blue (B) at the specific pixel P9 is set so that the color coordinate deviation Δ69 between the specific pixel P6 and the specific pixel P9 and the color coordinate deviation Δ89 between the specific pixel P8 and the specific pixel P9 are reduced. Adjust the correction value of the component.
[0096]
Based on the luminance correction value obtained in this way, the luminance correction value for all pixels can be obtained by performing linear interpolation over the entire display area of the projection screen. Note that such a luminance correction value is determined so that an optimal correction effect can be obtained for an image having a predetermined gradation, and thus the correction effect for a screen having different gradation and tone varies. Therefore, in order to suppress gradation / color tone dependency, it is preferable to prepare a plurality of correction values and switch them according to the gradation / color tone. Further, the correction values obtained with a plurality of gradations / tones may be averaged.
[0097]
As mentioned above, although Embodiment 1-Embodiment 3 were demonstrated, this invention is not limited to these, The various change accompanying the summary of a structure is possible. For example, in the first embodiment described above, the projection screen 300 is divided into eight triangular areas S1 to S8, but the number of areas is not limited to this. In the first embodiment described above, the UCS color system is used to obtain the luminance correction amount, but it is also possible to perform adjustment using another color system. Furthermore, although Embodiment 1 and Embodiment 2 described above apply the present invention to a projection display device, the present invention can also be applied to a digital micromirror device (DMD) as a projection display device. The present invention is particularly effective when three color image data are input to the image generation unit as in the case of a three-plate projection display device, but is not limited to the projection display device. However, the present invention can be applied to various display devices such as a direct-view liquid crystal display device. Further, the color unevenness correction method according to each of the above-described embodiments can be applied to a three-plate type or two-plate type CCD imaging device. In this case, the image picked up by the CCD image pickup device is temporarily displayed on the display screen, and the luminance is measured at the reference pixel to determine the correction amount. Similarly to the first embodiment described above, if coefficient data specific to a predetermined triangular area is stored in a memory and used, color unevenness in imaging characteristics can be corrected.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a projection display apparatus according to a first embodiment of the present invention.
FIG. 2 is an explanatory diagram showing sections of the projection screen according to the first embodiment.
FIG. 3 is an explanatory diagram illustrating a method of correcting a position on color coordinates in the first embodiment.
FIG. 4 is an explanatory diagram showing a screen generation unit of the projection display device according to the first embodiment.
FIG. 5 is an explanatory diagram showing a section of a projection screen showing a first modification of the first embodiment.
FIG. 6 is an explanatory diagram showing sections of a projection screen showing a second modification of the first embodiment.
FIG. 7 is a block diagram illustrating a projection display apparatus according to a second embodiment of the present invention.
FIG. 8 is an explanatory diagram of a color correction method according to the third embodiment of the present invention.
[Explanation of symbols]
1 Projection display
10 Image generator
20 Drive circuit section
21 Area determination part
22 memory
23 registers
24 Multiplier circuit
27 Color unevenness correction circuit
28 Gradation judgment part
300 projection screen

Claims (24)

A color unevenness correction method for display colors on an optical display surface on which a color image generated by an image generation unit of a display device is displayed,
The optical display surface for inputting reference color image data to the image generation unit to display a reference color image is partitioned into a plurality of triangular regions, and color coordinates at reference pixels located at three vertices of each of the triangular regions And determining a luminance correction amount at the reference pixel, and based on the luminance correction amounts at the three reference pixels in each of the triangular regions, the luminance at each pixel in each of the triangular regions. A correction amount is obtained according to a predetermined function, and color image data corresponding to each pixel in each of the triangular regions input to the image generation unit is corrected according to the luminance correction amount,
Z = aX + bY + c (where a, b, and c represent the luminance correction amount (Z)), which represents the above function using the X coordinate position and the Y coordinate position on the optical display surface as variables. coefficient)
A method for correcting color unevenness, characterized in that:   The luminance correction amount at the reference pixel located at the three vertices of the triangular area is obtained by setting the color coordinate measured by the reference pixel to a preset color coordinate or an average value of the color coordinates of all the reference pixels. 2. The color unevenness correction method according to claim 1, wherein the correction value is set so as to be matched.   The color unevenness correction method according to claim 1, wherein the luminance correction amount is set by adjusting at least a red (R) component and a blue (B) component.   4. The color unevenness correction method according to claim 3, wherein the luminance correction amount is set by adjusting two color components of red (R) and blue (B). A method for correcting color unevenness of a display color displayed on an optical display surface on which a color image generated by an image generation unit of a display device is displayed,
The optical display surface for inputting reference color image data to the image generation unit to display a reference color image is partitioned into a plurality of triangular regions, and color coordinates at reference pixels located at three vertices of each of the triangular regions Measure and
One specific pixel is set as a reference pixel, and the luminance correction amount is sequentially adjusted from the specific pixel in the vicinity of the reference pixel so that the color coordinate deviation between the specific pixels is minimum or near the minimum,
The luminance correction amount at any pixel between the specific pixels is obtained by linear interpolation based on the luminance correction amount at the specific pixel,
The color image data input to the image generation unit is corrected according to the luminance correction amount,
Z = aX + bY + c (where a, b, and c represent the luminance correction amount (Z)), which represents the above function using the X coordinate position and the Y coordinate position on the optical display surface as variables. coefficient)
A method for correcting color unevenness, characterized in that:   6. The color unevenness correction method according to claim 5, wherein the luminance correction amount is set by adjusting a blue (B) component. A plurality of reference color images having different gradations are displayed on the optical display surface, and the color coordinates at the reference pixels or the specific pixels at each gradation are measured,
The color unevenness correction method according to claim 1, wherein a luminance correction amount at the reference pixel or the specific pixel is obtained for each gradation.   The color unevenness correction method according to claim 1, wherein the display device is a projection display device. A color unevenness correction device for display colors on an optical display surface on which a color image generated by an image generation unit of a display device is displayed,
The color of the reference pixel located at the three vertices of each of the triangular areas, wherein the optical display surface for displaying the reference color image by inputting the reference color image data to the image generating section is divided into a plurality of triangular areas. A memory unit that stores in-region correction data determined based on luminance correction amounts at the three reference pixels determined based on the coordinate measurement results;
An area determination unit for determining which of the triangular areas the color image data corresponds to;
The color image data corresponding to the pixels input to the image generation unit is subjected to a luminance correction amount obtained by using the in-region correction data read from the memory unit based on the region data of the region determination unit. Correction,
Z = aX + bY + c (where a, b, and c represent the luminance correction amount (Z)), which represents the above function using the X coordinate position and the Y coordinate position on the optical display surface as variables. coefficient)
A color unevenness correction device characterized in that it is obtained by:   The color unevenness correction apparatus according to claim 9, wherein the memory unit includes a nonvolatile semiconductor memory device.   The in-area correction data is coefficient data corresponding to the coefficients a, b, and c, and the brightness correction control unit takes in coefficient data specific to the triangular area in accordance with the determination of the area determination unit , B register, c register, the luminance correction amount is calculated based on the coefficient data read from the a register, b register, c register, and address information of the color image data, and the luminance correction amount is The color unevenness correcting apparatus according to claim 9, further comprising a multiplying unit that multiplies the color image data. A color unevenness correction circuit for a display color displayed on an optical display surface on which a color image generated by an image generation unit of a display device is displayed,
The color of the reference pixel located at the three vertices of each of the triangular areas, wherein the optical display surface for displaying the reference color image by inputting the reference color image data to the image generating section is divided into a plurality of triangular areas. A storage circuit unit that stores in-region correction data determined from reference luminance correction amounts at the three reference pixels, determined based on the result of measuring coordinates;
An area determination circuit for determining which of the triangular areas the color image data corresponds to;
Luminance correction amount obtained by using the in-region correction data read from the storage circuit unit based on the region data of the region determination circuit unit for the color image data corresponding to the pixels to be input to the image generation unit A luminance correction control circuit unit that performs correction according to
Z = aX + bY + c (where a, b, c are A color unevenness correction circuit characterized in that it is obtained by a coefficient.   The color unevenness correction circuit according to claim 12, wherein the memory unit is a nonvolatile semiconductor memory device.   The in-area correction data is coefficient data corresponding to the coefficient, and the luminance correction control circuit receives a coefficient data specific to the triangular area in accordance with the determination of the area determination circuit unit, a register, b register, The luminance correction amount is calculated based on the c register, the coefficient data read from the a register, the b register, and the c register and the address information of the color image data, and the color image data is multiplied by the luminance correction amount. 14. The color unevenness correction circuit according to claim 12, further comprising a multiplication circuit unit. A display device that displays a color image generated by an image generation unit on an optical display surface,
The reference color image data is input to the image generation unit and the optical display surface for displaying the reference color image is divided into a plurality of triangular regions. Reference pixels located at three vertices of the triangular regions A memory unit that stores in-region correction data obtained from reference luminance correction amounts for the three reference pixels determined based on color coordinates;
Based on the intra-area correction data read from the memory unit, a luminance correction amount at each pixel in each triangular area is calculated according to a predetermined function, and according to the reference luminance correction amount or the luminance correction amount A luminance correction control unit that corrects color image data corresponding to each of the pixels in each of the triangular regions input to the image generation unit,
Yes,
Z = aX + bY + c (where a, b, and c represent the luminance correction amount (Z)), which represents the above function using the X coordinate position and the Y coordinate position on the optical display surface as variables. coefficient)
A display device characterized by being obtained by:   The reference luminance correction amount is set to a value to be corrected so that the color coordinate measured by the reference pixel matches the preset color coordinate or the average value of the color coordinates of all the reference pixels. The display device according to claim 15.   The display device according to claim 15 or 16, wherein the luminance correction amount is set by adjusting at least a red (R) component and a blue (B) component.   18. The display device according to claim 17, wherein the luminance correction amount is set by adjusting two color components of red (R) and blue (B). A display device for displaying a color image generated by an image generation unit of a display device on an optical display surface,
The optical display surface for displaying reference color images by inputting reference color image data to the image generation unit is divided into a plurality of triangular regions, and the color coordinates of reference pixels located at the three vertices of the triangular regions are determined. The luminance correction amount data of the specific pixels in the vicinity of the reference pixel are sequentially adjusted so that one of the specific pixels is a reference pixel so that the color coordinate deviation between the specific pixels obtained by measurement becomes the minimum or near the minimum. A brightness correction amount data at an arbitrary pixel between the specific pixels, which is obtained by linear interpolation based on the brightness correction amount, is obtained for a brightness correction amount at the specific pixel;
A luminance correction control unit that corrects color image data input to the image generation unit in accordance with luminance correction amount data read from the memory unit,
Z = aX + bY + c (where a, b, and c represent the luminance correction amount (Z)), which represents the above function using the X coordinate position and the Y coordinate position on the optical display surface as variables. coefficient)
A display device characterized by being obtained by:   The display device according to claim 19, wherein the luminance correction amount is set by adjusting a blue (B) component.   The luminance correction amount is obtained by displaying a plurality of reference color images having different gradations on the optical display surface, measuring the color coordinates of the reference pixels or the specific pixels at the respective gradations, 21. The display device according to claim 19 or 20, wherein the display device is required.   The display device according to any one of claims 15 to 21, wherein the image generation unit includes three light valves.   The display device according to claim 22, wherein the light valve is a liquid crystal panel.   24. The display device according to claim 22, wherein the optical display surface is formed on a screen.

Images