JPH06180555A - Color display device - Google Patents

Abstract

PURPOSE:To provide a color display device having a countermeasure by which the existence of a color cell which is broken or whose light emission gets faulty is easily detected and the color display of an entire display picture is not adeversely affected even though the color cell which is broken or whose light emission gets faulty exists. CONSTITUTION:This color display device 1 is constituted of a color display board 6 where plural picture element parts 5 consisting of at least three color cells 2-4 developing different kinds of colors are arranged in a matrix state, an image input means 7, a picture element address means 8, a picture element driver means 9, a color cell driver means 10 and a display control means 11 controlling the respective means; and it is provided with a picture element function inspecting mode setting means 12, a means 13 for detecting the light emitting state of the respective color cells 2-4, a means 14 for discriminating the faulty state of the light emission of the color cells, and a storage means 15 storing the address of the picture element part 5 and information on the kind of color in the case of judging that the color emission of at least one color cell gets faulty.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color display device, and more particularly, to a color display capable of improving a display image in a color display panel having pixels with defective light emission or destroyed. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, in addition to the cathode ray tube (CRT) system, there are various types of color display devices for displaying necessary images in color, for example, an LED.
There are ones that use a liquid crystal display, one that uses a liquid crystal display, one that uses a fluorescent display tube, one that uses plasma discharge, etc. Also, in each method, one pixel emits one kind of color Some of them are designed to be displayed, or one pixel includes a color-forming body for displaying a plurality of color types, and the structures and mechanisms thereof are different from each other.

However, the common structure of the color display devices in each of these systems is that the pixel portion having any one of the above-described color display systems is arranged in a matrix form vertically and horizontally in the color display board. It has a structure in which a plurality of pixels are arranged, and each of these pixels is selected and color-displayed according to an appropriate signal to display predetermined image information in color.

In such a color display device, some of a large number of such pixel units form a set, and proper color types for color display of each pixel are appropriately mixed to obtain a desired color type. A desired color type is reproduced in one pixel unit by appropriately reproducing or reproducing a plurality of color display bodies provided in one pixel unit, for example, proper color types of each color cell. Is configured to reproduce.

However, in the color display device, as described above, since a plurality of color types are combined to reproduce and display a desired color type, a plurality of colors forming one set are formed. In the case where one of the pixel units or one of the plurality of color display bodies provided in one pixel unit fails or is damaged and a predetermined color type cannot be displayed in a color display. Is, it becomes impossible to reproduce a desired and necessary color type as the pixel group or the pixel portion of the one set, and when observing the color display device as a whole, a different color portion occurs, There is a problem that the quality of the image deteriorates due to the occurrence of dark areas.

Therefore, an inspection is performed before the color display device is manufactured and shipped, and the shipment of the color display device having a pixel portion with a defective color display is stopped.
It is possible to take measures to repair and ship it,
Once the color display device reaches the user,
It was difficult to find the failure due to the large number of pixels, and the repair was practically impossible.

[0007]

Here, as an example of a color display device, reference is made to a color plasma display device in which ultraviolet rays generated by plasma discharge are used to excite different phosphors to emit different color species. However, the above problems in the color display device will be described.

That is, the color plasma display device generally has a surface discharge structure in which memory driving is performed by using wall charges formed by plasma discharge, and dots corresponding to display data are selectively written and discharged. In this case, the structure and the drive for determining the display state by the write pulse from the address electrodes arranged in a matrix shape with respect to the sustain discharge electrodes for display are performed.
It is called an AC type plasma display device.

Further, three display color cells for individually displaying the three primary colors of red (R), green (G) and blue (B) are provided in one pixel portion, and a desired color type is reproduced. In the case of expression, a plurality of different color types are reproduced and expressed in one pixel portion by selecting a proper ratio of unique color types possessed by each color cell and making them emit light. Things are possible.

For example, red (R), green (G) and blue (B)
White can be reproduced by mixing the colors in an appropriate ratio, and red (R) and green (G) are yellow, and red (R) and blue (B).
You can reproduce and display each purple with and. However, among the three display color cells (that is, 1 pixel = R cell + G cell + B cell) that compose one pixel section,
When one or two display color cells are damaged or the light emission is defective, the color type assigned to each of these color cells cannot be reproduced. In that case, The color type used for color display is a color type different from the predetermined color type.

For example, red (R), green (G) and blue (B)
If the green (G) display cell is damaged and the green color cannot be reproduced among the three primary display color cells, the above 3
In each of the individual color cells, when color display is performed so that the gradation level becomes 100% for each color type unique to that color cell, and the entire pixel portion is desired to be reproduced and displayed in white, If the damaged color cell does not display color at all or if the gradation level is low even if color display is performed, the pixel portion including the color cell displays purple in color, and the entire color display device is displayed. In the character display and the moving image display in the above, only that part is displayed with a unique color, which causes the display quality of the image to be greatly deteriorated.

On the other hand, in such a color display device, in the pixel portion including the damaged or defective light emitting color cell as described above, whether or not the damaged or defective light emitting color cell is displayed in color. Even a slight color display may not affect the color display of a desired color type to be reproduced by the pixel part, and some of the color cells may be damaged or light emission may be defective. However, there is a case where it is not always necessary to find the position and repair it, or to perform an operation such as replacing the entire color display device.

Therefore, an object of the present invention is to improve the above-mentioned drawbacks of the prior art, and to easily detect the presence of a color cell that is damaged or emits light at the same time. The present invention provides a color display device having a measure that does not adversely affect the color display of the entire display image even if there are color cells that have failed to emit light.

[0014]

In order to achieve the above-mentioned object, the present invention adopts the technical constitution as described below. That is, a color display board, an image input means, a pixel address means, a pixel driver means, each of which is formed by arranging a plurality of pixels, each of which is composed of at least three color cells that emit different color types, in a matrix shape A color display device comprising color cell driver means and display control means for controlling the respective means, a pixel function inspection mode setting means, a light emitting state detecting means for each color cell, and a light emitting defective state determining means for the color cell. A storage unit that stores the address and color type information of the pixel when it is determined that at least one color cell of at least three color cells forming the pixel is defective in light emission. Is a color display device,
Further, in the above color display device, when image information is input to the image input means of the color display device, the address of the pixel portion included in the image information and the address of the pixel portion are stored in the storage means. The address of the pixel portion including the color cell having the light emission failure is compared, and when the address of the input pixel portion and the address of the pixel portion including the color cell having the light emission failure stored in the storage unit match, The color display device includes a discriminating means for generating a signal for stopping the color display of the pixel portion, and a switching means for stopping the color display of the pixel portion according to the signal of the discriminating means.

More specifically, in a color display device constructed by arranging a plurality of pixels, each of which is composed of at least three color cells each of which emits a different color type, in a matrix form. The color cell is configured so that the unique color type that can be generated by the color cell can be changed to a plurality of gradations, and for each reproduction color that a specific pixel should display, each color that configures the pixel. For each of the cells, the degree of color development for the color unique to each color cell is specified at a predetermined gradation level, and when the pixel emits a reproduction color, each color cell of the pixel is The degree of color development is detected at the gradation level,
A color display configured to stop the coloring operation of the pixel when there is at least one color cell in which the detected gradation level does not reach the predetermined gradation level. It is a device.

[0016]

That is, in the color display device according to the present invention, it is possible to easily and easily detect a damaged or defective light emitting color cell, which was difficult in the conventional color display device. In addition, the inspection process is simplified, and in the past, if a damaged or defective light emitting color cell was present, the color display of the pixel portion was completely stopped. Alternatively, while the brightness was reduced,
In the present invention, an address of a pixel portion in which a damaged or defective light emitting color cell is detected in advance and it is found that a damaged or defective light emitting color cell exists, color type information in the pixel, and the pixel portion. Information indicating the light emission state of each color cell of, for example, gradation levels is stored in an appropriate storage unit, and when a pixel having a predetermined address and predetermined color type information is input, the storage is performed. When the address of the pixel including the damaged or defective light emitting color cell stored in the means is matched, the pixel portion is processed so as not to display the color. In another example, the damaged or light emitting is performed. When pixel information having the same address as that of a pixel portion having a defective color cell is input, the presence of the damaged or defective light emitting color cell is reproduced by the pixel portion. As long as it does not affect the color type, the pixel unit is driven to display the desired color type, and the presence of the damaged or defective light emitting color cell causes the pixel unit to reproduce the color type to be reproduced. Since the driving of the pixel portion is stopped only when it is determined that the pixel quality is affected, the quality of the image can be significantly improved compared to the image quality of the conventional color display device.

Further, it is not necessary to repair or replace the pixel portion which is found to have a damaged or defective light emitting color cell each time, and the operation performance can be greatly improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of a color display device according to the present invention will be described in detail below with reference to the drawings. Figure 1
2 is a block diagram showing a configuration of a specific example of the color display device 1 according to the present invention, in which pixels each of which is composed of at least three color cells 2, 3 and 4 which emit different color types. A plurality of units 5 are arranged in a matrix to form a color display board 6, an image input unit 7, a pixel address unit 8, a pixel driver unit 9, a color cell driver unit 10, and display control for controlling each unit. In the color display device 1 configured by means 11 and 11, the pixel function inspection mode setting means 12 and the respective color cells 2, 3, 4 are provided.
It is determined that at least one of the three color cells 2, 3 and 4 forming the pixel section has a light emission failure. In this case, the pixel unit 5
Storage means 15 for storing the address and color type information of the
Is shown, and further, when image information is input to the image input means 7 of the color display device 1, the address of the pixel portion 5 included in the image information is displayed. , Compares the address of the pixel unit 5 including the color cell having the poor light emission stored in the storage unit 15 to determine the address of the input pixel unit 5 and the color cell having the poor light emission stored in the storage unit 15. When the addresses of the included pixel units match, the determination unit 1 that generates a signal for stopping the color display of the pixel unit 5
7 and the pixel section 5 according to the signal of the discrimination means 17.
And a switching means 18 for stopping the color display of the color display device.

The color display device 1 according to the present invention will be described more specifically. When image information is input to the image input means 7 of the color display device 1, the pixel portion 5 included in the image information is displayed. The address is compared with the address of the pixel unit 5 including the color cell having the defective light emission stored in the storage unit 15, and the input address of the pixel unit 5 and the defective light emission stored in the storage unit 15 are compared. When the addresses of the pixel unit 5 including the color cell of No. 1 match, the pixel unit 5 has the color type information stored in the storage unit 15 with respect to the predetermined color type for color display. It is determined by the determining means 17 whether or not the defective light emitting color cell has an adverse effect, and the defective light emitting color cell stored in the storage means 15 is a color to be displayed in the color of the pixel portion. If the adverse effect on the switching means 1 for stopping the color development view of the pixel portion by a signal of the pixel unit judging means 17 the color display to generate a signal for stopping the 5, and the discriminating means 17
8 is a color display device.

That is, as shown in FIG. 1, the color display device 1 according to the present invention includes three color display devices for individually displaying red (R), green (G) and blue (B) colors. The color display board 6 is formed in a matrix shape by arranging a plurality of the pixel units 5 in the vertical and horizontal directions with the pixel unit 5 including the color cells 2, 3 and 4 as a unit.

In the color display device 1 according to the present invention, normally, for example, the X-side address circuit is based on the address information of each pixel portion and the color type information included in the image information input from the image input means 7. 8-2 and the Y-side address circuit 8-1, the predetermined pixel portion 5 is selected by the address means 8 and is constituted by the X-side driver circuit 9-2 and the Y-side driver circuit 9-1. The driver means 9 operates to supply a driving voltage to the pixel portion 5 at the selected address position to drive the pixel portion 5 for color display.

Incidentally, in the present invention, in order to solve the problems in the prior art, the inspection mode selection means 12 is provided, and when the inspection mode is selected, from the normal image display, The operation of inspecting whether or not the normal color display is performed for each of the pixel portions is executed. In this case, the address means sequentially selects all the pixel portions 5 forming the color display board 6, and the driver means is driven for each of the selected pixel portions 5 to form the three pixel portions. The light emitting state of each of the color cells is checked.

A specific example of a method of executing the inspection mode will be described with reference to FIGS. 2 and 3 by taking a color display device using plasma discharge as an example. FIG. 2 is an enlarged plan view showing a part of the color display board 6 used in the color display device according to the present invention. Each pixel unit 5 has three color cells, that is, red (R). Is composed of three color cells, that is, a color cell 2 for displaying color, a color cell 3 for displaying green (G), and a color cell 4 for displaying blue (B).

Now, the color cell 3 for displaying green (G) in the pixel portion 5 at the address position (X2, Y3) is damaged,
It is assumed that no color is displayed at all, or that a desired gradation level cannot be displayed in color. On the other hand, in a color display device using plasma discharge, a predetermined pixel unit 5
When a driving voltage waveform as shown in FIG. 3A is applied to each of the color cells, the normal color cell generates a driving current waveform as shown in FIG. 3B.

That is, when the drive voltage waveform is input, the displacement current a instantaneously flows in synchronization with the fall of the drive voltage waveform, and the displacement current b in synchronization with the rise of the drive voltage waveform. The current flows instantaneously, and the discharge current c flows between them. On the other hand, in the damaged color cell, as shown in FIG. 3C, the displacement currents a and b instantaneously flow in synchronization with the fall and rise of the drive voltage waveform, but the discharge current waveform No occurrence is seen.

Therefore, by detecting the presence of the discharge current, it can be determined whether or not the color cell is normally driven. If there is no discharge current, the color cell is completely damaged. You can judge whether it is destroyed or not. Further, even if the color cell is completely damaged or not destroyed, if the light emission is defective, the magnitude of the discharge current changes according to the degree, so that the amount of the discharge current should be detected. , The color display state of the color cell can be confirmed.

Therefore, the magnitude of the discharge current is set to 0, for example.
From 255 to 255 gradation levels are detected, the light emitting state of the color cell is normal, only about 50% of the normal color is displayed, or no damage and no light is emitted. I know if it is in. Therefore, in the inspection mode of the present invention, all the pixel portions 5 constituting the color display board 6 are sequentially selected by using the address means and the driver means, and, for example, A voltage capable of displaying the maximum gradation level (the gradation level is 255) is applied to all the color cells, the discharge current generated at that time is detected, and the gradation level may be measured.

It is desirable that the inspection mode of the present invention is executed at the same time when the color display device is powered on and the system is started up. Whether or not the color cell is in a defective light emission state is determined by whether or not the gradation level detected from the color cell is equal to or lower than a predetermined value as described above. However, the predetermined value may be set, for example, such that the gradation level is 0, that is, the color cell does not display any color, or the gradation level displays the color display of the color cell. The maximum gradation level may be set to 50% or less.

The predetermined value is an appropriate criterion storage circuit 1
It can be executed by storing it in No. 6 and reading it out as needed, and making a comparison calculation in the light emission defect state judging means 14. However, as will be described later, such a threshold value may not be determined simply, and is relatively determined from the color type to be reproduced in the display of the pixel portion, the color type of the pixel portion around the pixel portion, and the like. May need to be determined.

In the present invention, when a pixel portion in which at least one color cell has a damaged or defective light emission state is detected during execution of the inspection mode by the inspection mode selection means, the pixel concerned is detected. The address information and color type of each part are stored in the storage means 15. More preferably, the gradation level information detected for each color cell forming the pixel part is also stored in the storage means 15. It is something to remember.

When the predetermined inspection for the pixel portion is completed in the inspection mode, the mode is switched to the normal mode, and the necessary image information is input to the image input means of the color display device. In such a case, the address of a predetermined pixel portion included in the image information and the storage unit 15
Pixel portion 5 including color cells of defective light emission stored in
When the input address of the pixel unit 5 and the address of the pixel unit 15 including the color cell having the defective light emission stored in the storage unit 15 match, the determination unit 17 determines A signal for stopping the color display of the pixel portion 5 is generated, the switching means 18 is operated, and the operation of applying the drive voltage to the pixel portion is stopped.

Here, in the present invention, each pixel portion 5 forming the input image information 19 has predetermined address information, predetermined color type information to be reproduced by the pixel portion 5, and Each of at least three color cells necessary for color display of the color type includes gradation level information predetermined for the color type to be color-displayed.

Therefore, as another specific example of the present invention, the gradation level information of the color cell having the defective light emission detected by the light emitting state detecting means 13 is stored in the storage means together with the address of the pixel portion. Since it is stored in 15,
Among the pixel units 5 included in the input image information, in order to display the color type to be displayed in color by the pixel unit having the same address, each color cell of the pixel unit has a predetermined value. The gradation level information to be displayed in color for the specific color type is compared with the gradation level stored in the storage unit 15, and the light emission state of the color cell having the light emission failure is determined by the pixel unit. The color display of the pixel portion is stopped when the color type of the color display is adversely affected.

Here, the case where the light emission state of the color cell having the poor light emission has a bad influence on the color type of the pixel portion for displaying color is the color cell having the poor light emission including the color cell having the poor light emission. The color type that should be displayed in the pixel section is reproduced as an altered color type due to the presence of the color cell with the defective light emission, but the reproduced color type is compared with the color type originally set. When viewed by human eyes, it is necessary to judge objectively by whether it is noticeable as a different color, whether the display state is altered for that reason, or whether it causes a defect, and it is necessary to make a specific setting level. It's difficult to decide.

For example, when it is determined that white is to be displayed in a certain pixel portion, it is necessary that all three color cells forming the pixel portion have a gradation level of 255. Is. Therefore, for example, when the gradation level of the color cell (R) and the color cell (B) of the pixel is 255 and the gradation level of the color cell (G) is 150 or less, When the pixel information indicating that white is to be displayed in color, no white color appears at all, and in this case, the light emission state of the color cell in which the light emission is defective is different from the color type of the pixel portion to be displayed in color. Therefore, it is determined that the pixel portion is adversely affected, and the color display of the pixel portion is stopped.

When it is determined that a certain pixel portion displays purple, the floor of the color cell (R) and the color cell (B) among the three color cells forming the pixel portion is displayed. The tonal level needs to be 255, but the tone level of the color cell (G) is preferably 0. For that reason,
In the existing pixel portion, for example, the gradation level of the color cell (R) and the color cell (B) is 255, and the color cell (G)
When the gradation level of 0 is 0, and it is judged in a normal inspection that the pixel portion has a damaged or defective light emitting color cell, there is pixel information indicating that the pixel portion displays purple. Since, of course, purple is displayed as a color, in this case, it is determined that the light emission state of the color cell having the light emission failure does not adversely affect the color type of the pixel portion for color display. Color display of the pixel portion is executed.

That is, even if a certain pixel portion includes a color cell that has a defective light emission,
If the pixel information is such that the color display of the defective color cells is below the gradation level at which the color display is possible, even if the pixel portion is displayed in color, the above-mentioned adverse effect does not occur. Therefore, color display is executed. Things are possible. In order to realize such an operation, the present invention adopts the configuration as shown in FIG. 1 as described above, and at the same time, the predetermined address information is provided in each pixel portion forming the input image information. , Predetermined color type information to be reproduced by the pixel portion, and at least three color cells necessary for color-displaying the color type are predetermined for each color type to be color-displayed. The gradation level information of the color cell having the defective light emission detected by the light emitting state detecting unit 13 is the address of the pixel section. At the same time, it is necessary to store it in the storage means 15.

Further, in order to display the color type to be displayed in color by each pixel portion included in the input image information, each color cell of each input pixel portion has a predetermined value. The gradation level information to be color-displayed for a specific color type is compared with the gradation level in the pixel portion stored in the storage unit 15, and the light emission state of the color cell having the light emission failure is According to the above-mentioned criteria, the discrimination means 17
In this case, when a predetermined judgment is made and the color type of the pixel section 5 to be displayed in color is adversely affected, the color display of the pixel section is stopped.

Another embodiment of the present invention will be described with reference to FIG. In FIG. 1, a coloring gradation level detecting means 13 which is an example of the light emitting state detecting means 13 of the color cell.
Uses the address circuit 8-2 on the X side and the driver circuit 9-2 to sequentially select all the pixel portions 5 forming the color display board 6, and the color cell driver circuit 10 causes The color cells of the pixel section are sequentially selected to detect the light emitting state of each color cell. In the specific example of FIG. 4, the Y-side address circuit 8-1 and the Y-side driver circuit 9-1 are detected. Is used and the light emission state detecting means 13 is divided and arranged for each color cell forming each pixel portion for each line in the Y direction. Therefore, the number of divided inspection times is N. Then, the inspection time can be reduced to 1 / N in the case of FIG.

[0040]

Since the color display device according to the present invention employs the technical configuration as described above, a pixel portion having a damaged color cell or a pixel portion including a color cell having a defective light emission is colored. When it is displayed, if the display result is adversely affected, the pixel portion is not color-displayed, and if it is not adversely affected, the pixel portion is color-displayed. It is possible to eliminate a noticeable display defect, and at the same time, it is possible to significantly improve the image quality as compared with the image quality of the conventional color display device.

Further, it is not necessary to repair or replace the pixel portion in which it is found that there is a damaged or defective light emitting color cell, and the operation performance can be greatly improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a specific example of a color display device according to the present invention.

FIG. 2 is a diagram illustrating an example of the configuration of a color display board of a color display device according to the present invention and an example of a method of detecting a color cell having a defective light emission.

FIG. 3 is a diagram illustrating an example of a method of detecting a color cell having a light emission failure according to the present invention.

FIG. 4 is a block diagram showing the configuration of another specific example of the color display device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Color display device 2, 3, 4 ... Color cell 5 ... Pixel part 6 ... Color display board 7 ... Image information input means 8 ... Address means 9 ... Driver means 10 ... Color cell driver means 11 ... Control means 12 ... Inspection mode Selection means 13 ... Color cell light emission state detection means 14 ... Color cell light emission failure state determination means 15 ... Storage means 16 ... Judgment reference storage circuit 17 ... Determination means 18 ... Switching means 19 ... Image information

Claims (10)

[Claims] 1. A color display board, an image inputting means, a pixel addressing means, and a pixel, each of which is formed by arranging a plurality of pixels, each of which is composed of at least three color cells which emit different color types, in a matrix form. In a color display device including a driver unit, a color cell driver unit, and a display control unit for controlling each unit, a pixel function inspection mode setting unit,
When it is determined that at least one color cell of the at least three color cells forming the pixel is defective in light emission, A color display device comprising: a storage unit that stores the address and color type information of the pixel. 2. When the image information is input to the image input means of the color display device, the address of the pixel portion included in the image information and the color cell of defective light emission stored in the storage means are included. The address of the pixel portion is compared, and when the address of the input pixel portion and the address of the pixel portion including the color cell having the defective light emission stored in the storage unit match, the color display of the pixel portion is stopped. 2. The color display device according to claim 1, wherein the color display device comprises a discriminating means for generating a signal for causing the color display and a switching means for stopping the color display of the pixel portion according to the signal from the discriminating means. 3. When the image information is input to the image input means of the color display device, the address of the pixel portion included in the image information and the color cell of the defective light emission stored in the storage means are included. The address of the pixel portion is compared, and if the address of the input pixel portion and the address of the pixel portion including the color cell having the defective light emission stored in the storage unit match, the pixel portion should display color. With respect to a predetermined color type, it is determined whether or not the color cell having the light emission failure having the color type information stored in the storage unit has an adverse effect, and stored in the storage unit. In the case where the color cell of the defective light emission has a bad influence on the color type of the pixel portion for color display, a discriminating means for generating a signal for stopping the color display of the pixel portion, and a signal of the discriminating means. 2. The color display device according to claim 1, wherein the color display device comprises a switching means for stopping the color display of the pixel portion according to the number. 4. The light emitting state detecting means of the color cell comprises:
4. The color display device according to claim 1, wherein, in each of the color cells, a gradation level of a color type in which each color cell is displaying color is detected. 5. The light emitting defect state of the color cell is determined by whether or not the gradation level detected from the color cell is equal to or lower than a predetermined value. The color display device according to claim 1 or 2. 6. When the color display device is a color display device of a type that utilizes plasma discharge, the light emission state detecting means includes a color cell of the color cell when a driving voltage is applied to the pixel portion. The color display device according to claim 4, wherein a discharge current flowing through each is detected. 7. The gradation level of a color type displayed by the color cell for color display is configured to be detected by the magnitude of the discharge current. Color display device. 8. Each pixel portion that constitutes the input image information is required to display predetermined address information, predetermined color type information to be reproduced by the pixel portion, and color display of the color type. 8. At least three color cells each include gradation level information predetermined for a color type to be color-displayed.
5. The color display device according to any one of 1. 9. The gradation level information of the color cell having the light emission failure detected by the light emission state detection means is stored in the storage means together with the address of the pixel portion,
In order to display the color type in which each pixel portion included in the input image information should be displayed in color, each color cell holds it,
The gradation level information to be color-displayed for the specific color type determined in advance is compared, and the light-emission state of the color cell having the poor light emission adversely affects the color-type to be color-displayed in the pixel section. 9. The color display device according to claim 1, wherein the color display device is configured to stop the color display of the pixel portion when the above-mentioned effect occurs. 10. The pixel function inspection mode is executed at the same time when the system of the color display device is started up.
The color display device described.