JP2000315070A - Full color display - Google Patents

Abstract

(57) [Summary] [Problem] To provide a full-color display capable of obtaining a high-quality display image in which both luminance and color components are simultaneously made uniform. SOLUTION: A dot is formed by a combination of light-emitting elements of R, G, B emission colors, and the dots are arranged in a matrix on a display surface.
In a full-color display that displays a color image based on the image data of B, a color mixing ratio correction unit that corrects emission luminance and color tone and displays on the light emitting element with respect to fluctuation of the emission wavelength of the light emitting element is provided, Even if the emission wavelength fluctuates, the emission luminance and the color tone are simultaneously corrected by the color mixing ratio correction means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matrix in which a combination of light-emitting elements having three light-emitting colors of red (R), green (G) and blue (B) is arranged as one dot on a display screen. Related to full color display.

[0002]

2. Description of the Related Art Full-color displays using light-emitting diodes (hereinafter referred to as "LEDs") are known as R,
The basic configuration is that a combination of the light-emitting elements of the G and B LEDs is arranged in a matrix on the LED display as one dot, and a color image is displayed by controlling the R, G, and B light emission of each dot. . In this full-color display, a blinking operation is controlled by a driving transistor, a driver IC, and the like for each row and each column of the light emitting elements in the matrix arrangement.

The R, G, and B LEDs are obtained by stacking a compound semiconductor on a substrate and extracting light from an active layer in this layer. Luminance and color tone depend on the luminance rank and wavelength rank of each LED. With variations. For this reason,
If energization control is performed so that the same current flows through all the LEDs arranged in a matrix, unevenness in brightness and color tone is generated due to the difference in the brightness rank and wavelength rank of each LED. If only LEDs having the same luminance rank and the same wavelength rank are used, a uniform color in both luminance and color tone can be displayed on the entire screen. However, if a plurality of wavelength ranks are used, variations in the color tone naturally occur, and if a plurality of brightness ranks are used and the same driving current is used, the brightness ranks are different, so that the brightness varies.

[0004] On the other hand, it has been effective to grasp the ranks of all LEDs in advance and control the drive current of each LED so that the brightness and color tone of the entire image display do not vary. . That is, by controlling the energization so that the luminance and the color tone are corrected in accordance with the respective ranks in dot units based on the combination of R, G, and B, the variation in the luminance and the color tone is suppressed.

[0005]

As described above, the correction operation corresponding to the rank of the light emission intensity is preferable in that the dispersion of the luminance is eliminated and an image display with uniform luminance over the entire screen can be obtained.

However, when brightness is corrected to the same brightness by using LEDs having different brightness ranks, the LED is different for each brightness rank.
The value of the current flowing through the device differs. That is, since the current value of the LED of each luminance rank changes for luminance correction, in the case of an LED, each L
The emission wavelength of the ED varies. In addition, the emission wavelength of the LED also varies depending on the ambient temperature. For this reason,
Even if the same luminance can be made uniform by correcting the light emission luminance, the light emission wavelength changes and the color tone becomes less uniform, resulting in a new variation in the color tone.

As described above, although the light emission luminance can be made uniform in the related art, the color tone balance is broken due to the change of the current value and the ambient temperature, and thus the color tone of the displayed image is inevitable.

It is an object of the present invention to provide a full-color display capable of obtaining a high-quality display image in which both luminance and color components are simultaneously made uniform.

[0009]

According to the present invention, dots are formed by a combination of light-emitting elements of R, G, and B colors, and the dots are arranged in a matrix on a display surface. A full-color display for displaying a color image based on G and B image data, a storage means for storing correlation data between a current value flowing through the light emitting element, an ambient temperature of the light emitting element, and an emission wavelength at that time, Current value measuring means for measuring the current flowing through the device, temperature measuring means for measuring the temperature around the light emitting element, and the current value and temperature measured by the current value measuring means and the temperature measuring means are inputted. R corresponding to
Current value reference color coordinate output means and temperature reference color coordinate output means for identifying and outputting the color coordinates of the G and B light emitting elements, and light emitting elements of different ranks with respect to the image data from the image data sending unit. Image data reference color coordinate output means for calculating color coordinates for obtaining color matching, and respective color coordinates from the image data reference color coordinate output means, current value reference color coordinate output means, and temperature reference color coordinate measurement means Color mixing ratio correction means for receiving the output signal, correcting the light emission luminance and color tone, and displaying on the light emitting element.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
Dots are formed by a combination of light-emitting elements of G and B emission colors, and the dots are arranged in a matrix on a display surface;
In a full-color display that displays a color image based on R, G, and B image data from an image data transmission unit, a light emission luminance and a color tone are corrected for a change in the light emission wavelength of the light emitting element and displayed on the light emitting element. This is a full-color display including a color mixing ratio correcting means for causing the light emission luminance and the color tone to be corrected simultaneously by the color mixing ratio correcting means even if the emission wavelength of the light emitting element fluctuates.

According to a second aspect of the present invention, dots are formed by a combination of light-emitting elements of R, G, and B colors, and the dots are arranged in a matrix on a display surface. , A full-color display for displaying a color image based on the image data of B, a storage means for storing correlation data between a current value flowing through the light emitting element and an emission wavelength at that time, and a current for measuring a current supplied to the light emitting element. A current value measured by the current value measuring means and R, G, B corresponding to the current value.
Current value reference color coordinate output means for identifying and outputting the color coordinates of the light emitting elements of the light emitting element, and color coordinates for matching the hue between light emitting elements of different ranks with respect to the image data from the image data sending unit. The image data reference color coordinate output means to be operated, and the respective color coordinate output signals from the image data reference color coordinate output means and the current value reference color coordinate output means are input, and the light emission luminance and the color tone are corrected to be applied to the light emitting element. This is a full-color display comprising a color mixture ratio correcting means to be displayed, and has an effect of promoting uniformity of luminance and color tone of a light emitting element to obtain a high quality image display.

According to a third aspect of the present invention, dots are formed by a combination of light-emitting elements of R, G, and B colors, and the dots are arranged in a matrix on a display surface. , A full-color display for displaying a color image based on the image data of B, storing means for storing correlation data between the ambient temperature of the light emitting element and the emission wavelength at that time, and temperature measuring means for measuring the peripheral temperature of the light emitting element Temperature reference color coordinate output means for inputting a temperature measured by the temperature measurement means and identifying and outputting color coordinates of R, G, and B light emitting elements corresponding to the temperature; Image data reference color coordinate output means for calculating color coordinates for matching color shades between light emitting elements of different ranks with respect to the image data; A color mixing ratio correction means for receiving the respective color coordinate output signals from the target output means and the temperature reference color coordinate output means, correcting the light emission luminance and color tone, and displaying the corrected color mixture on the light emitting element. Has the effect of promoting the uniformity of the brightness and the color tone of the image to obtain a high-quality image display.

According to a fourth aspect of the present invention, dots are formed by a combination of light-emitting elements of R, G, and B colors, and the dots are arranged in a matrix on a display surface. A full-color display for displaying a color image based on the image data of the light-emitting element, a storage means for storing correlation data between the current value flowing through the light-emitting element, the ambient temperature of the light-emitting element, and the emission wavelength at that time, A current value measuring means for measuring a flowing current and a temperature measuring means for measuring a peripheral temperature of the light emitting element; a current value and a temperature measured by the current value measuring means and the temperature measuring means are inputted; The corresponding R, G,
Current value reference color coordinate output means and temperature reference color coordinate output means for identifying and outputting the color coordinates of the light emitting element B, and adjusting the hue between the light emitting elements of different ranks with respect to the image data from the image data sending unit. Image data reference color coordinate output means for calculating color coordinates for matching, and respective color coordinate output signals from the image data reference color coordinate output means, current value reference color coordinate output means and temperature reference color coordinate output means Is a full-color display comprising color mixing ratio correction means for correcting the light emission luminance and color tone and displaying the same on the light emitting element, and promoting the uniformity of the luminance and color tone of the light emitting element to obtain a high quality image display. It has the action of:

A specific example of an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a system configuration of a full-color display of the present invention, and FIG. 2 is a control flowchart.

In FIG. 1, a luminance / tone adjusting circuit 2 is connected to an image data transmitting section 1 for transmitting image data to be displayed on a full color display. The luminance / color tone adjustment circuit 2 includes a current value-color coordinate correlation data ROM 3 as current value reference color coordinate output means, a color coordinate determination circuit 4 as image data reference color coordinate output means, a current value measurement circuit 5,
The color mixing ratio adjusting circuit 6 is provided.

The current value-color coordinate correlation data ROM 3 stores current flowing through each LED and measurement data of color coordinates of light emitted from the LED. Current value measurement circuit 5
Always measures the current supplied to the R, G, B LEDs arranged in a matrix on the full color display 7 (S1, S2). The color coordinate determination circuit 4 determines which color coordinate the R, G, B data is located in when using the R, G, B LED of each luminance rank by the current value measurement circuit 5. It is derived from the current value-color coordinate correlation data ROM 3 based on the values Ir, Ig, Ib (S3, S4). The current value-color coordinate correlation data ROM 3 stores the color coordinates (Xr, Yr) of the LED of each color based on the correlation data according to the current value supplied to each LED input from the current value measurement circuit 5. ), (Xg, Yg) and (Xb, Yb) (S5).

Here, two types of LEs with luminance ranks 1 and 2 are used.
When D is used, the current flowing to each LED changes depending on the difference in the luminance rank. Therefore, the emission wavelength of each LED also shifts, and the coordinates on the color coordinates also differ. That is, using the color coordinates shown in FIG.
The coordinates of R, G, and B for the LED of luminance rank 1 are (Xr1, Yr1), (Xg1, Yg1), (Xb1,
Yb1), and R,
The coordinates of G and B are (Xr2, Yr2), (Xg2, Yg
2), (Xb2, Yb2). Then, L of all luminance ranks provided in the full-color display 7
Regarding the ED, it is assumed that data indicating what coordinate value on the color coordinate corresponds to the magnitude of the current value to be supplied is stored in the current value-color coordinate correlation data ROM 3. The color coordinate data output from the current value-color coordinate correlation data ROM 3 is input to the color mixing ratio adjustment circuit 6.

When the color coordinates are used, the three colors specified by the R, G, and B single-color LED color coordinates can be represented by the three coordinates of the R, G, and B LEDs. This is the area included in the triangle. Therefore, the brightness ranks 1, 2
In the case of the two types of LED, as shown in FIG. 3A, (Xr1, Yr1), (Xg1, Yg1), (Xb
LE of a luminance rank 1 of a triangle having the apex angle of (1, Yb1)
D color expression area, (Xr2, Yr2), (Xg2, Y
g2), there are two triangular-colored LED color representation regions having apex angles of (Xb2, Yb2). That is, for the color data input by the color coordinate determination circuit 4, the coordinate values of R, G, and B of the luminance ranks 1 and 2 are (Xr1, Yr1), (Xr2, Yr2), and (Xg
1, Yg1) and (Xg2, Yg2), (Xb1, Yb
1) and (Xb2, Yb2) are all different. The colors that can be expressed by both the LEDs of the luminance ranks 1 and 2 are areas in a range where these triangular color expression areas overlap.

Here, for example, when the input image data is R: G: B = 1: 1: 1, that is, white, the color coordinates (Xw1, Yw1) of the LED of the luminance rank 1 are shown in FIG.
(A) of (Xr1, Yr1), (Xg1, Yg
1) and (Xb1, Yb1) correspond to the position of the center of gravity of the triangle specified by the three coordinates. Similarly, brightness rank 2
The color coordinates (Xw2, Yw2) in the case of the LED are also three coordinates (Xr2, Yr2), (Xg
2, Yg2) and (Xb2, Yb2). Since these coordinates (Xw1, Yw1) and (Xw2, Yw2) are naturally different, it is necessary to determine color coordinates that match each other so that the luminance of the LEDs of ranks 1 and 2 does not vary.
In the present invention, the color coordinates of the matching point are defined as the midpoint of (Xw1, Yw1) and (Xw2, Yw2).

When the input image data is R: G: B
= 1: 0: 0, that is, when the color is red, the color coordinates of the LED of luminance rank 1 are (Xr1, Y) as shown in FIG.
r1), and the color coordinates of the LED of luminance rank 2 are (Xr
2, Yr2). The matching point in this case is a point (Xr1, Yr1), the closest point (Xr2, Yr2) to the area where the triangles overlap from the coordinates (Xr1, Yr2).
r, Yr).

In this manner, the matching points (Xrgb, Yrgb) for the colors of both LEDs are set (S
6). Then, this matching point (Xrgb, Y
When rgb) is determined, as shown in FIG. 3 (b), first, for the LED of rank 1, the color of the point RG1 can be obtained by the distribution ratio of the light emission intensity of the R LED and the G LED.
Next, the color of the matching point (Xrgb, Yrgb) can be obtained by adjusting the distribution ratio of the emission intensity of the B LED to that color. Similarly, for the LED of rank 2, the LE of R
The color of the point RG2 can be obtained by the distribution ratio of the light emission intensities of the D and G LEDs. Next, if the distribution ratio of the light emission intensity of the B LED is adjusted to the color, the matching point (X
rgb, Yrgb). Therefore, even the LEDs of different ranks can output the color of the point having the same coordinates.

The setting of the color coordinates (Xrgb, Yrgb) of such a matching point is performed by the color mixing ratio adjusting circuit 6.
It is possible to calculate the color mixing ratio of the three color LEDs of the luminance ranks 1 and 2 so that the color coordinates (Xrgb, Yrgb) are obtained. Then, the color coordinates (Xrg
b, Yrgb), the image data R1, G1, B1 and R2, G2,
B2 is input to the LED of each luminance rank on the full color display 7 (S7, S8). Therefore, according to the image data input from the image data transmission unit 1, the color coordinates are changed to L of various luminance ranks and wavelength ranks.
It can be reproduced using ED.

As described above, even when LEDs of various luminance ranks and wavelength ranks are used, the color coordinates of the light emitting elements are adjusted by adjusting the mixture ratio of the colors of the LEDs, so that the same color coordinates are obtained between panels of different ranks. Can be adjusted to
Also, regarding the luminance, by adjusting the mixing amount while maintaining the color coordinates at a constant mixing ratio, the luminance can be uniformly adjusted, and a display with uniform luminance and color tone can be displayed on the full-color display 7. .

FIG. 4 is a block diagram showing the system configuration of the full-color display of the present invention when the ambient temperature is different, and FIG. 5 is a control flowchart.

In FIG. 4, a luminance and color tone adjusting circuit 2 is connected to an image data transmitting section 1 for transmitting image data to be displayed on a full color display. The luminance / color tone adjustment circuit unit 2 includes a temperature-color coordinate correlation data ROM 8 as a temperature reference color coordinate output unit, a color coordinate determination circuit 4 as an image data reference color coordinate output unit, a temperature measurement circuit 9, and a color mixing ratio adjustment circuit 6. It is provided with.

The temperature-color coordinate correlation data ROM 8 stores each L
This stores the measurement data of the ambient temperature of the ED and the color coordinates of the light emitted from the LED. The color coordinate determination circuit 4 derives from the measured value Th obtained by the temperature measurement circuit 9 and the temperature-color coordinate correlation data ROM 8 as to which color coordinate the R, G, B data is located at each temperature. Temperature measurement circuit 9
Always measures the ambient temperature of the R, G, B LEDs arranged in a matrix on the full color display 7. The temperature-color coordinate correlation data ROM 8 stores the color coordinates of each color LED (Xr, Yr) based on the correlation data according to the ambient temperature of each LED input from the temperature measurement circuit 9.
Output as (Xg, Yg) and (Xb, Yb).

Here, the ambient temperature of each LED changes depending on the installation position of the panel. Therefore, the emission wavelength of each LED also shifts, and the coordinates on the color coordinates also differ. That is, using the color coordinates shown in FIG. 6, the coordinates of R, G, and B for the LED at the ambient temperature Th1 are (Xr
1, Yr1), (Xg1, Yg1), (Xb1, Yb
R) for the LED at ambient temperature Th2
The coordinates of G and B are (Xr2, Yr2), (Xg2, Yg
2), (Xb2, Yb2). Then, for all the LEDs provided in the full-color display 7, data indicating what coordinate values on the color coordinates with respect to the ambient temperature of the LEDs are stored in the temperature-color coordinate correlation data ROM.
8 are stored. The color coordinate data output from the temperature-color coordinate correlation data ROM 8 is input to the color mixing ratio adjustment circuit 6.

When the color coordinates are used, the three colors specified by the R, G, and B single-color LED color coordinates can be represented by three points of the apex angle. This is the area included in the triangle. Therefore, the ambient temperature Th1,
In the case of Th2, as shown in FIG. 6, (Xr1, Yr
(1), (Xg1, Yg1), (Xr1, Yg2), (Xr2, Yg2), (Xg2, Yg2), (Xb2)
There are two LED color expression regions at a peripheral temperature Th2 of a triangle having a vertex angle of 2, Yb2). That is, with respect to the color data input by the color coordinate determination circuit 4, the coordinate values of R, G, and B at the peripheral temperatures Th1 and Th2 are:
(Xr1, Yr1) and (Xr2, Yr2), (Xg1,
Yg1) and (Xg2, Yg2), and (Xb1, Yb1) and (Xb2, Yb2). The colors that can be expressed by the LEDs at the ambient temperatures Th1 and Th2 are areas in a range in which these triangular color expression areas overlap.

Thereafter, the method of color matching is the same as the above-described method of color matching with the current value. In this way, the color coordinates can be reproduced according to the image data input from the image data transmission unit 1 even if the panel peripheral temperature changes.

As described above, even when LEDs of various brightness ranks and wavelength ranks are used, the color coordinates of the light emitting elements are adjusted by adjusting the mixing ratio of the colors of the LEDs, even if the LED ambient temperature differs depending on the installation position of the panel. By doing so, it is possible to match the same color coordinates between panels with different temperatures between panels of different ranks, and adjust the mixing amount while maintaining the color coordinates at a constant mixing ratio for luminance. , The luminance can be uniformly adjusted, and a display with uniform luminance and color tone can be displayed on the full-color display 7.

In the above description, L is used as the light emitting element.
Although the example of the ED has been described, it is a matter of course that the present invention can be applied to, for example, an organic electroluminescence element. In this case, the current is taken as a factor that changes the color coordinates, and a current value measuring circuit is provided. However, if there is another factor that changes the color coordinates, such as temperature, as described in claims 3 and 4, Also includes providing a color coordinate correlation data ROM.

[0033]

According to the present invention, since the mixture ratio of the luminous intensity of the R, G, and B light emitting elements is adjusted, a high-quality image with uniform luminance and color tone can be displayed on a full-color display. Further, since it is not necessary to carefully select the light-emitting elements as one-rank products, manufacturing costs are reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a full-color display of the present invention.

FIG. 2 is a flowchart of control in the system of the full color display of the present invention.

3A is a diagram illustrating R, G, and B color coordinates of two LEDs of luminance ranks 1 and 2, and FIG. 3B is a diagram illustrating identification of color coordinates after adjusting a color mixing ratio.

FIG. 4 is a block diagram showing a system configuration of a full-color display of the present invention.

FIG. 5 is a flowchart of control in the system of the full color display of the present invention.

FIG. 6 shows R, G, and R of LEDs at ambient temperatures Th1 and Th2.
Diagram showing color coordinates of B

[Explanation of symbols]

Reference Signs List 1 Image data sending unit 2 Luminance / tone adjustment circuit unit 3 Current value-color coordinate correlation data ROM (current value reference color coordinate output means) 4 Color coordinate determination circuit (image data reference color coordinate output means) 5 Current value measurement circuit 6 colors Mixing ratio adjustment circuit 7 Full color display 8 Temperature-color coordinate correlation data ROM (temperature reference color coordinate output means) 9 Temperature measurement circuit

Claims (4)

[Claims] 1. A dot is formed by a combination of light-emitting elements of R, G, and B emission colors, the dots are arranged in a matrix on a display surface, and R, G, and B from an image data transmission unit.
A full-color display for displaying a color image based on the image data according to the above, further comprising a color mixing ratio correcting means for correcting a light emission luminance and a color tone with respect to a change in a light emission wavelength of the light emitting element and displaying the color mixture ratio on the light emitting element. 2. A dot is formed by a combination of light emitting elements of R, G, and B emission colors, and the dots are arranged in a matrix on a display surface.
In a full-color display for displaying a color image based on the image data, storage means for storing correlation data between the current value flowing through the light emitting element and the emission wavelength at that time, and a current value measuring means for measuring the current supplied to the light emitting element Current value reference color coordinate output means for inputting a current value measured by the current value measurement means, identifying and outputting color coordinates of R, G, and B light emitting elements corresponding to the current value; Image data reference color coordinate output means for calculating color coordinates for matching colors between light emitting elements of different ranks with respect to the image data from the sending section; and the image data reference color coordinate output means and current value reference color. Color mixing ratio correction means for receiving the respective color coordinate output signals from the coordinate output means, correcting the light emission luminance and color tone, and displaying on the light emitting element. Color display. 3. A dot is formed by a combination of light-emitting elements of R, G, and B emission colors, and the dots are arranged in a matrix on a display surface.
In a full-color display that displays a color image based on the image data of (1), storage means for storing correlation data between the temperature around the light emitting element and the emission wavelength at that time, a temperature measuring means for measuring the temperature around the light emitting element, and the temperature Temperature reference color coordinate output means for inputting the temperature measured by the measurement means and identifying and outputting the color coordinates of the R, G, and B light emitting elements corresponding to the temperature; Image data reference color coordinate output means for calculating color coordinates for obtaining color matching between light emitting elements of different ranks, and respective colors from the image data reference color coordinate output means and the temperature reference color coordinate output means. A color mixing ratio correction means for receiving the coordinate output signal, correcting the light emission luminance and color tone, and displaying on the light emitting element. . 4. A dot is formed by a combination of light-emitting elements of R, G, and B emission colors, and the dots are arranged in a matrix on a display surface.
In a full-color display for displaying a color image based on the image data of (1), means for storing current value flowing through the light emitting element and correlation data between the ambient temperature of the light emitting element and the emission wavelength at that time; Current value measuring means and temperature measuring means for measuring the temperature around the element; and current values and temperatures measured by the current value measuring means and the temperature measuring means are inputted, and R, G, and R corresponding to the current value and temperature are inputted. Current value reference color coordinate output means and temperature reference color coordinate output means for identifying and outputting the color coordinates of the light emitting element B, and adjusting the hue between the light emitting elements of different ranks with respect to the image data from the image data sending unit. Image data reference color coordinate output means for calculating color coordinates for matching, the image data reference color coordinate output means, and a current value reference color coordinate output means; Full color display and means, and each of color mixing ratio correction means for color coordinate output signal is input is displayed on the light emitting element to correct the emission luminance and color from a temperature reference color coordinate output means.