JPH10133627A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the color reproducibility of a green area by providing a converting circuit which converts input data into output data representing N (integer larger than 4) basic colors and a control circuit which controls illumination/nonillumination states of light emitting elements. SOLUTION: This device is equipped with an input process circuit 1 which inputs a control signal and RGB data of red, green, and blue, a color arithmetic circuit 2 which converts the data inputted by the input circuit 1 into data on the four colors (red, blue, yellowish green, and viridian), and an illumination control circuit 3 which controls the ON/OFF states of respective light emitting diodes included in each light emission block (dot) 5. Then the illumination control circuit 3 has four-stage constitution corresponding to the four colors after conversion, and data of the same primary colors R, G, and B as usual are inputted to the input signal processing circuit 1 and the light emission block 5 consisting of light emitting diodes of the four colors can make a display with superior color reproducibility in a green area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode display device having a display surface in which light emitting blocks constituting one dot are arranged in a matrix.

[0002]

2. Description of the Related Art To construct a light-emitting diode display capable of displaying a plurality of colors, such as full color or multi-color, at least three basic colors of red, blue and green (RGB).
Is required, and this light-emitting block constitutes one dot of the light-emitting diode display device.

In a conventional light emitting diode display device, an input signal processing circuit for taking in RGB data, a color operation processing circuit for performing color adjustment, and a lighting control for controlling a lighting state of the display circuit are provided for each of the RGB. It is configured to include a circuit and a large number of the light-emitting blocks, and has a three-stage configuration of red, blue, and green according to RGB.

[0004]

However, since the conventional light emitting diodes do not have sufficient light emitting characteristics to display pure green light, each light emitting diode has a red light emitting diode, a blue light emitting diode, and a yellow green light emitting diode. The yellow-green light-emitting diode is driven as a light-emitting diode that emits pure green light, particularly in an input signal processing circuit, a color operation processing circuit, and a lighting control circuit.

[0005] In such a conventional configuration, there is a problem that color reproducibility in a green region is low, although a display comparable to that of red and blue is possible as compared with a television or a CRT.

Incidentally, it is theoretically not impossible to develop a green light-emitting diode capable of emitting pure green, but it requires a great deal of cost and labor.

Accordingly, an object of the present invention is to provide a light emitting diode display device having improved color reproducibility in a green region.

[0008]

According to the present invention, a display device comprises:
A light-emitting block having a plurality of light-emitting elements respectively emitting light of different basic colors; a first color; a second color;
An input circuit for receiving input data representing the colors of the colors, a conversion circuit for converting the input data into output data representing N basic colors, and turning on / off the plurality of light emitting elements according to the output data. And N is an integer of 4 or more, thereby achieving the above object.

Preferably, the coloring area on the chromaticity diagram of the light-emitting block has a plurality of areas defined by M reference colors, and each of the M reference colors corresponds to the N basic colors. Wherein the conversion circuit comprises: a circuit for selecting one of the plurality of regions in accordance with the input data; and a conversion circuit for selecting at least one of the regions corresponding to the selected region. A circuit for generating the output data based on one of the reference colors.

In one embodiment, the plurality of regions are CR
Covers the color development region of T.

In one embodiment, at least one of the M reference colors is different from the N basic colors.

In still another embodiment, the plurality of light emitting elements are four light emitting diodes, each of which is red,
Emit light of the basic colors blue, yellow-green and blue-green.

In still another embodiment, M is an integer of 4 or more.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The meanings of terms and symbols used in the embodiments of the present application are defined as follows.

"Basic color" is the color of light emitted by the light emitting element of the minimum unit forming the display device. In the following embodiments, specifically, the “basic color” is one light emitting diode (L
ED) is the color of the light emitted. Regarding the notation of “basic color”, for example, the color of light emitted from a red light emitting diode (LED) is R _LED, and the red color displayed by one pixel of the _CRT is R _CRT . Similar notations are used for other basic colors.

The "coloring area" indicates a range of colors that the display device can develop on a CIE chromaticity diagram (hereinafter referred to as a chromaticity diagram).

The "reference color" is a color that determines a "coloring area" of the display device. The “reference color” may be the same color as the “basic color” (a color having the same chromaticity coordinates as the chromaticity coordinates of the basic color), or may be obtained by combining at least two “basic colors”. "Color". The “reference color” is represented by adding a subscript “REF” to a symbol representing a color, such as R _REF .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a schematic view showing a structure of a light emitting diode display device according to an embodiment of the present invention. _{Reference numeral} 1 denotes an input processing circuit which receives a control signal and red, green, and blue (R _CRT , G _CRT, and B _CRT ) RGB data (input data is the same as a conventional one). Reference numeral 2 denotes each data captured by the input processing circuit 1 in four colors (red: R _LED , blue: B _LED , yellow-green: Y
G _LED , blue-green: BG _LED ). Reference numeral 3 denotes lighting / lighting of each light emitting diode included in each light emitting block (dot) 5 in the display circuit 4 described later.
This is a lighting control circuit that controls turning off. Reference numeral 4 denotes a display circuit in which the light-emitting blocks 5 are arranged in a matrix in the xy directions.

In the light-emitting block 5, the light-emitting diodes are arranged in a 3 × 3 lattice, for example, as shown in FIG. 2A, and are arranged point-symmetrically with respect to the blue-green light-emitting diode BG. (In the figure, R, B,
The types of light emitting diodes are indicated by YG and BG). In this example, yellow-green light-emitting diodes YG are arranged at four corners with the blue-green light-emitting diode BG interposed therebetween in order to improve green color reproducibility.

FIG. 3 is a block diagram showing a specific structure of the light emitting diode display device according to the embodiment of the present invention shown in FIG. The input signal processing circuit 1 has a timing processing circuit 11, a red data capturing circuit 12, a green data capturing circuit 13, and a blue data capturing circuit 14. The timing processing circuit 11 inputs a control signal and performs time control of turning on / off each light emitting diode.
The red data capturing circuit 12, the green data capturing circuit 13, and the blue data capturing circuit 14 capture red data, green data, and blue data, respectively. Thus, the input signal processing circuit 1 has a three-stage configuration corresponding to RGB data.

The color operation processing circuit 2 includes a color comparison processing circuit 21
, Red data operation circuit 22, and blue-green data operation circuit 2
3, a yellow-green data operation circuit 24, and a blue data operation circuit 25. The color comparison processing circuit 21 converts the RGB data captured by the input signal processing circuit 1 into four colors (R _LED , B _LED , Y
G _LED and BG _LED ). The red data operation circuit 22, the blue-green data operation circuit 23, the yellow-green data operation circuit 24, and the blue data operation circuit 25 respectively operate the data for the four light emitting diodes obtained by the conversion. Thus, the color operation processing circuit 2 has a four-stage configuration corresponding to four colors (four basic colors).

The lighting control circuit 3 has a red data array conversion circuit 31, a blue-green data array conversion circuit 32, a yellow-green data array conversion circuit 33, and a blue data array conversion circuit 34. Further, a red LED lighting circuit 35 and a blue-green LED
Lighting circuit 36, yellow-green LED lighting circuit 37, blue LE
D lighting circuit 38. The four data array conversion circuits 31 to 34 convert each of the four color data obtained by the color operation processing circuit 2 into parallel / serial data. The four LED lighting circuits 35 to 38 perform individual level adjustments for the respective light emitting diodes based on each of the serially converted data of the four colors, and then adjust the corresponding red light emitting diodes R, The blue-green light emitting diode BG, the yellow-green light emitting diode YG, and the blue light emitting diode B are turned on. Thus, the lighting control circuit 3 has a four-stage configuration corresponding to the four colors (four basic colors) after the conversion.

The switching element Tr of the display circuit 4 connected to each light emitting diode is turned on / off by the output of the timing processing circuit 11, and the light emitting time per unit time of each light emitting diode is controlled.

With this configuration, the input signal processing circuit 1
By inputting data of three basic colors of RGB as before, the light-emitting block 5 composed of light-emitting diodes of four colors (R _LED , B _LED , YG _LED , and BG _LED ) has excellent color reproducibility in the green region. Display can be performed.

Next, the principle of color reproducibility will be described with reference to the chromaticity diagram of FIG. The chromaticity diagram of FIG. 4 can represent all colors in a region surrounded by a cloud-shaped curve, and each color is specified by an intersection (chromaticity coordinate) of coordinates on the vertical axis and the horizontal axis.

The center W _REF point in the cloud curve shows white. The right side of the W _REF point is a red area, the upper left side is a green area, and the lower left side is a blue area.

Here, the conventional light emitting block or the light emitting diode display device using the light emitting block is composed of the red light emitting diode, the blue light emitting diode, and the yellow green light emitting diode as described above.
_It emits light only in a triangular area having three points of _LED , B _LED and YG _LED as vertices. And NTSC (National T
In a television of the elevision system (commitee) system, a color can be developed in a triangular area having vertices of a point R _CRT , a point G _CRT and a point B _CRT .

Therefore, the conventional light-emitting block is NT
Compared with the SC type television, the color reproducibility is generally inferior only in the triangular area of the point YG _LED , the point B _LED , and the point G _CRT . That is, in the conventional light-emitting block, there is an area in the green area where coloring is considerably impossible.

On the other hand, the light emitting block 5 in the light emitting diode display device of the present invention includes a red light emitting diode, a blue light emitting diode, a blue green light emitting diode and a yellow green light emitting diode. Therefore, the displayable area of the light-emitting block 5 is within a square having the points R _LED , B _LED , BG _LED and YG _LED as vertices.

That is, as compared with the conventional light-emitting block, the displayable area is enlarged only in the triangular area having the point YG _LED , the point BG _LED , and the point B _LED as the vertices (in the chromaticity diagram). The color reproducibility of the system can be improved.

FIGS. 2 (b) to 2 (d) are diagrams showing other examples of the configuration of the light emitting block applicable to the present invention. In the example shown in FIG. 2B, the light-emitting block 5 is
It is composed of diodes of seven colors of R (red), G (green), B (blue), Y (yellow), O (orange), P (purple), and C (light blue). According to this example, FIGS. 1 and 3
It is preferable that the circuit configuration of the color operation processing circuit 2 and the circuit configuration of the lighting control circuit 3 described based on the above are configured in a seven-stage configuration corresponding to seven colors.

In the example shown in FIG. 2C, a green LED is located at the center, and six LEDs of Y, B, W, C, R, and P are located around the center. The G and the distance from each of the six LEDs are all the same.

In the example shown in FIG. 2D, one light-emitting block includes 18 LEDs. The 18 LEDs
G, P, B, Y, R, YG, W, and C are constituted by eight color LEDs.

(Embodiment 2) The circuit section 500 has an input signal processing circuit 510, a color operation processing circuit 520, and a lighting control circuit 530. The input signal processing circuit 510 calculates
_It receives input data representing the mixture ratio of _CRT , G _CRT and B _CRT and sends this input data to the color operation processing circuit 520. The color operation processing circuit 520 converts the input data into output data representing the combination ratio of the four basic colors, and passes the output data to the lighting control circuit 530. The lighting control circuit 530 includes:
On / off of each of the four light emitting diodes included in the light emitting block is controlled based on the received output data.

Next, the function and configuration of the color operation processing circuit 520 will be described. The color operation processing circuit 520 uses the four basic colors as four reference colors to define the light emitting area of the light emitting block. In addition to these four reference colors, the ratios of the three RGB signals are equal (R _CRT : G _CRT : B _CRT =
1: 1: 1) The white point is also used as the reference color W _REF . Moreover,
As shown in FIG. 6, the color calculation processing circuit 520 divides the coloring region and defines four regions I to IV each surrounded by W _REF and two reference colors. In addition, the point W _REF itself is regarded as one region, and is defined as a region V.

The color operation processing circuit 520 has five area operation circuits 540a to 540e and a color comparison processing circuit 521. The color comparison processing circuit 521 compares three signals constituting the input data with each other. Accordingly, the color comparison processing circuit 521 determines which of the regions I to V on the chromaticity diagram shown in FIG. 6 the color represented by the input data belongs to.

Each of region calculation circuits 540a to 540e is provided corresponding to each of regions I to V. The area calculation circuits 540a to 540e store calculation formulas for converting RGB signals (input data) to obtain data representing a combination ratio of four basic colors. The area calculation circuits 540a to 540e obtain output data for the four basic colors according to the calculation formula. This calculation formula is determined for each of the regions I to V.

An example of the operation of the color comparison processing circuit 521 and the area calculation circuits 540a to 540e will be described. It is assumed that the color comparison processing circuit 521 determines that the color represented by the input data belongs to the region I. The color comparison processing circuit 521 selects the region operation circuit 540a corresponding to the region I from the region operation circuits 540a to 540e, and enables the operation.
The area calculation circuit 540a converts the input data representing the first color element, the second color element, and the third color element (R _CRT , G _CRT and B _CRT ) received from the input signal processing circuit 510 into 4
Two basic colors: R _LED , BG _LED , YG _LED and B
_{The LED} is converted into output data representing the blending ratio of the _LED . Although the R _CRT signal, the G _CRT signal, and the B _CRT signal are input to all of the region operation processing circuits 540a to 540e, the region operation circuit 540a selected by the color comparison processing circuit 521
Only perform calculations.

As shown in FIG. 6, there is a point YG _{LED at} an intermediate point between the point R _CRT and the point G _CRT, and a point BG _{LED at} an intermediate point between the point G _CRT and the point B _CRT . Therefore, a specific intermediate color between the point R _CRT and the point G _CRT (a specific balance value of the RGB signal)
To the point YC _LED and the points G _CRT and B
Assign a point BG _LED to a specific intermediate color to and from the _CRT . That is, when any of these specific intermediate colors is input to the color operation processing circuit 520, the color operation processing circuit 520
Outputs output data for causing the point YG _LED or the point BG _LED to independently generate color. In addition, the mixing ratio of the four basic colors (the emission luminance balance of each of the four LEDs) for _developing the point G _CRT is also assigned to the specific input data.

The output data from the color operation processing circuit 520 is sent to four output circuits 550a to 550d for R _LED , BG _LED , YG _LED and B _LED . This output data is then sent from output circuits 550a to 550d to output timing circuit 560. The output timing circuit 560 converts the output data into a signal form for operating the LED display device and outputs the signal to each LED, thereby controlling the turning on / off of the four light emitting diodes.

Each of the area operation processing circuits 540a to 540e has a red data operation circuit 22, a blue-green data operation circuit 23, a yellow-green data operation circuit 24 and a blue data operation circuit 25 shown in FIG.

When the display device 500 has the above configuration, when input data representing R _CRT -G _CRT -B _CRT -R _CRT is input to the display device 500 in this order, four diodes are connected to the R _LED- YG _LED -G _LED -BG _LED -B
_{The LEDs} emit light in the order of _LED- R _LED . If the input data corresponds to the color between each LED color and the W _REF point, the area calculation processing circuit for each area determines the W _REF point and the color of each of the four LEDs (basic color). ), The composition ratio of each basic color is recalculated based on the composition ratio (emission luminance balance).
The light-emitting block emits color according to the output signal of the calculation result.

(Embodiment 3) According to the control methods of Embodiments 1 and 2, when a CRT is used as a reference, a color that cannot be formed by the CRT is also formed. It looks like a color. Further, the area calculation processing circuit 54
Since 0a to 540e always perform only a constant operation, either 0a to 540e output a fixed amount of input data or generate colors by combining four colors (basic colors).
Therefore, the basic colors R _LED , YG _LED , BG
_If the color of the _LED and the color of the B _LED differ depending on the variation of the single _LED, the color of the blended LED will be different for each light-emitting block and for each display device. In particular, the influence is great near the boundary of the coloring area.

The effect will be described by taking the light emitting diode BG as an example. As shown in FIG. 7, when the light emitting diode BG1 that emits color at the coloration position (chromaticity coordinates) is replaced with the light emitting diode BG2 that emits color at the position,
Luminous color area of the block is R _{LE D} -YG _LED --B _LED
From the area surrounded by, changes in the region surrounded by the R _LED -YG _LED --B _LED. With reference to the coloring area of the light emitting block having the light emitting diode BG1, the coloring property of the light emitting block having the light emitting diode BG2 is −B
_{The LED} area is missing and a --- YG _LED area occurs. In particular, the two display devices emit different colors in and around the basic color. The same is conceivable for LEDs of other colors, and even when the same input signal is applied, the colors are visually different from product to product.

The circuit section 900 shown in FIG. 8 can secure a coloring area close to the CRT and can reduce variations in LED coloring. Circuit section 900
Has four different light emitting diodes similar to the second embodiment. However, this embodiment differs from the second embodiment in that the color operation processing circuit 920 uses seven colors different from the basic colors as reference colors.

The circuit section 900 includes an input signal processing circuit 910
And a color operation processing circuit 920 and a lighting control circuit 930. The input signal processing circuit 510 receives input data representing the mixing ratio of R _CRT , G _CRT and B _CRT and sends the input data to the color operation processing circuit 920. The color operation processing circuit 920 converts the input data into output data representing the combination ratio of the four basic colors, and passes the output data to the lighting control circuit 930. The lighting control circuit 930 controls on / off of each of the four light emitting diodes included in the light emitting block based on the received output data.

The color operation processing circuit 920 determines seven reference colors by combining the four basic colors. These are R _REF (red), Y, as shown in the chromaticity diagram in FIG.
_REF (yellow), G _REF (green), C _REF (light blue), B
_REF (blue), P _REF (purple) and W _REF (white). These seven reference colors are close to the colors generated by the CRT and are visually good colors. The color operation processing circuit 920 uses these 7
A light-emitting area of a light-emitting block is defined using one reference color. Further, as shown in FIG.
Defines six regions I to VI surrounded by a reference color W _REF and two of the other reference colors.
Also, the point W _REF itself is regarded as one area, and is referred to as an area VII.

The configuration and function of the color operation processing circuit 920 will be described more specifically. The color operation processing circuit 920 includes seven area operation circuits 940a to 940g and a color comparison processing circuit 921. The color comparison processing circuit 921 compares three signals constituting the input data with each other. Thus, the color comparison processing circuit 921 determines which of the regions I to VII on the chromaticity diagram shown in FIG. 9 the color represented by the input data belongs to.

The region operation circuits 940a to 940g are provided in the region
It is provided corresponding to each of I to region VII. Each of the region calculation circuits 940a to 940g has four basic colors for generating seven reference colors, that is, R _LED , Y
The compounding ratio of G _LED , BG _LED and B _LED (ie, 4
(Emission intensity ratio of each LED). Further, the area operation circuits 940a to 940
g stores a calculation formula for converting the input data based on the reference color and obtaining data representing the combination ratio of the four basic colors. The region calculation circuits 940a to 940g obtain output data for the four basic colors according to the calculation formula. This calculation formula is determined for each of the regions I to VII.

Each of the area operation processing circuits 940a to 940g has the red data operation circuit 22, the blue-green data operation circuit 23, the yellow-green data operation circuit 24 and the blue data operation circuit 25 shown in FIG.

As described below, the input data representing R _CRT , G _CRT and B _CRT are R _REF , YG _REF and BG _REF
And B _REF is converted into output data representing the blending ratio.
When the input data represents a monochromatic red color (R _CRT ), one of the area calculation processing circuits performs calculation so that the light-emitting block emits light on a straight line connecting the reference color W _REF and the reference color R _REF .
When the input data represents a single green color (G _CRT ) by a similar calculation, the light-emitting block emits the reference color W _REF.
And a reference color G _REF . If the input data represents a single blue color (B _CRT ), the light-emitting block emits light on a straight line between the reference color W _REF and the reference color B _REF . If the input data corresponds to R _CRT : G _CRT = 1: 1, the light-emitting block emits light on a straight line between the reference color W _REF and the reference color Y _REF . Similarly, if the input data is
When G _CRT : B _CRT = 1: 1, the light-emitting block emits light on a straight line between the reference color W _REF and the reference color C _REF, and the input data is R _CRT : G _CRT : B _CRT. = 1: 1:
In the case of 1, the region calculation processing circuit 1 performs calculation so that the light-emitting block emits a color on the reference color W _REF .

An example of calculation performed by the color operation processing circuit 920 used in this embodiment will be described below. According to the following formula, the emission intensity ratio of the four LEDs can be calculated for the color represented by the input data.

The input signal to the color operation processing circuit 920 is I
R, IG and IB, and the output signal from the conversion circuit is L
R, LYG, LBG and LB. The color comparison circuit 921 determines the magnitude relationship between the input signals IR, IG, and IB, and according to the conversion table shown in FIG.
It is determined which of the regions I to VII the color represented by the GB signal belongs to.

[0055]

[Table 1]

Table 2 shows the compounding ratio of the basic colors (color developing intensity ratio of the four diodes) for generating the seven reference colors.

[0057]

[Table 2]

The arithmetic expressions in the regions I to VII for obtaining the output signal are as shown in the expressions (1) to (8). However, the variables shown in Table 3 are substituted for the symbols X, Z and C1 to C3 in the formula.

[0059]-area _{I~VI LR = (W r * C1} ) + (X r * C2) + (Z r * C3) (1) LYG = (W yg * C1) + (X yg * C2) + ( _Zyg * C3) (2) LBG = ( _Wbg * C1) + ( _Xbg * C2) + ( _Zbg * C3) (3) LB = ( _Wb * C1) + ( _Xb * C2) + ( _{Z b * C3) (4)} · area _{VII LR = W r * IR (} 5) LYG = W yg * IG (6) LBG = W bg * IG (7) LB = W b * IB
(8)

[0060]

[Table 3]

Using the above formulation, for example, the region I
Are calculated from the above equations (1) to (4) and the first row of Table 3 as equations (9) to (12).

LR = (W _r * IB) + (R _r * (IR-IG)) + (Y _r * (IG-IB)) (9) LYG = (W _yg * IB) + (R _yg * ( (IR-IG)) + (Y _yg * (IG-IB)) (10) LBG = (W _bg * IB) + (R _bg * (IR-IG)) + (Y _bg * (IG-IB)) ( _{11) LB = (W b *} IB) + (R b * (IR-IG)) + (Y b * (IG-IB)) and (12), calculation of the area V, the above (1) to ( 4) Formula and Table 3
From the fifth row of the above, equations (13) to (16) are obtained.

LR = (W _r * IG) + (B _r * (IB-IR)) + (M _r * (IR-IG)) (13) LYG = (W _yg * IG) + (B _yg * ( (IB-IR)) + (M _yg * (IR-IG)) (14) LBG = (W _bg * IG) + (B _bg * (IB-IR)) + (M _bg * (IR-IG)) ( 15) LB = ( _Wb * IG) + ( _Bb * (IB-IR)) + ( _Mb * (IR-IG)) (16) Referring to FIG. Verify the change. As in the example shown in FIG. 7, it is assumed that the coloring position (chromaticity coordinates) of the light emitting diode BG deviates from the position. As shown in FIG.
By shifting the coloring position of G, the reference color G _REF (=
G _CRT ) is shifted to the position of G1 _{REF, and} the position of the reference color Y _REF is shifted to the position of Y1 _REF . However, as is clear from the chromaticity diagram, the color change amount of the reference color is smaller than the color change amount of the basic color (change of chromaticity coordinates).

As the color position of the light emitting diode BG shifts, the color region becomes Y _REF -Y 1 _REF -G _REF -G
1 The area surrounded by _REF increases, and G1 _REF -G _REF -C1
A region surrounded by the _REF -B _REF -C _REF is decreased. However, the increased / decreased range is so narrow that it cannot be visually recognized. Similarly, even if there is a variation in the coloring of the basic colors of the other three LEDs, the change in the coloring region surrounded by the seven reference colors can be reduced.

(Embodiment 4) FIG. 11 shows an example in which six LEDs emitting six different colors are used. The colors (basic colors) emitted by the six LEDs are R _LED and Y, respectively.
G _LED , G _LED , C _LED , B _LED and P _LED .

Since the CRT coloring area is included in the area surrounded by the basic color of each single color LED, these six L
Color development (same as CRT color development) is possible using a light-emitting block having an ED. R _REF2 , Y _REF2 , G _REF2 , G _REF2 ,
C _REF2 , B _REF2 , P _REF2 and W _REF2 are determined on the chromaticity diagram. These seven reference colors are colors suitable for reproducing the color-developing characteristics of the CRT, and the color region determined by these colors includes the color region of the CRT. When the characteristic values of the mixing ratios of the six basic colors for emitting the light of the seven reference colors are stored in the area calculation circuit, the color development can be controlled within the range of the coloring area determined by the seven reference colors.

Even if the display device using four LEDs per one light emitting block described in the third embodiment is used, the CR
The same coloring characteristics as T can be provided. This means that the data of the mixing ratio of the basic colors for generating the reference colors stored in the color operation processing circuit 920 is converted into R _REF2 , Y
_REF2 , _GREF2 , _CREF2 , _BREF2 , _PREF2, and _WREF2 can be achieved by matching the data of the mixing ratio for _developing color.

This means that the number of basic colors of the LED (= LED
Whatever the number), if the region surrounded by the basic colors of the LEDs includes the region to be colored, the display device has two sets of reference colors in common, and thus includes two display devices with different included LEDs. The same color can be developed mutually. 2
This is because the coloring areas of the two display devices can be made the same.

[0069]

According to the light emitting diode display device of the present invention, light of a color close to pure green can be emitted, and the color reproducibility of the green region can be improved to provide a well-balanced display. it can. Further, by using the light emitting diode display device, it is possible to secure a coloring region close to the CRT and to reduce variation in LED coloring.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a display device according to a first embodiment.

FIGS. 2A to 2D are diagrams illustrating an example of an arrangement of light emitting diodes included in one light emitting block.

FIG. 3 is a diagram illustrating a configuration of a display device according to the first embodiment.

FIG. 4 is a CIE chromaticity diagram showing a coloring region of the display device of the present invention.

FIG. 5 is a schematic diagram illustrating a circuit included in a display device according to a second embodiment.

FIG. 6 is a CIE chromaticity diagram showing a coloring region of the display device according to the second embodiment.

FIG. 7 is a CIE chromaticity diagram showing a change in a coloring region observed when variation occurs in coloring of a blue-green diode BG.

FIG. 8 is a schematic diagram illustrating a circuit included in a display device according to a third embodiment.

FIG. 9 is a CIE chromaticity diagram showing a coloring region of the display device according to the third embodiment.

FIG. 10 is a CIE chromaticity diagram showing a change in a coloring region observed when a variation occurs in the coloring of the blue-green diode BG.

FIG. 11 is a CIE showing a coloring area of the display device according to the fourth embodiment.
It is a chromaticity diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input signal processing circuit 2 Color calculation processing circuit 3 Lighting control circuit 4 Display circuit 5 Light emission block 11 Timing processing circuit 12 Red data capture circuit 13 Green data capture circuit 14 Blue data capture circuit 21 Color comparison processing circuit 22 Red data calculation circuit 23 Blue-green data operation circuit 24 Yellow-green data operation circuit 25 Blue data operation circuit

Claims (6)

[Claims] 1. An input circuit for receiving input data representing a first color, a second color, and a third color, the light-emitting block having a plurality of light-emitting elements each emitting N different basic colors. A conversion circuit for converting the input data into output data representing N basic colors; and a control circuit for controlling turning on / off of the plurality of light emitting elements according to the output data. A display device that is an integer greater than or equal to. 2. The color-forming area on the chromaticity diagram of the light-emitting block has a plurality of areas defined by M reference colors, and each of the M reference colors corresponds to the N basic colors. The conversion circuit is configured to select one of the plurality of regions according to the input data; and at least one corresponding to the selected region. The display device according to claim 1, further comprising: a circuit that generates the output data based on a reference color. 3. The display device according to claim 2, wherein the plurality of areas cover a color display area of a CRT. 4. The display device according to claim 2, wherein at least one of the M reference colors is different from the N basic colors. 5. The display device according to claim 1, wherein the plurality of light-emitting elements are four light-emitting diodes, each of which emits light of a basic color of red, blue, yellow-green, and blue-green. 6. The method according to claim 5, wherein M is an integer of 4 or more.
The display device according to claim 1.