JP2000356970A - Display controller and display control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a clear image in which the range of color reproduction is wide by maintaining the advantage that clear and natural colors are obtained in the reproduction of the natural blue and white colors of blue sky and snow even when primary colors whose color purities are better than those of the three primary colors of the NTSC signal system are used while overcoming a disadvantage that the greed color of natural trees or the like becomes bluish and unnatural in PDP (color plasma display) which is driven with the NTSC signal system. SOLUTION: A light emission luminance detecting circuit 10 detects each light emission luminance of input signals Sr, Sg, Sb of the three primary colors of the NTSC signal system, that is, to which of 64 gradations by a subfield(SF) method the input signals are equivalent to output conversion control signals indicating the light emission luminance of the signals. A conversion circuit 20 generates conversion signals Sr', Sg', Sb' which are obtained by mixing other primary colors with the input signals Sr, Sg, Sb of the three primary colors of the NTSC signal system on the basis of the conversion control signals from the circuit 10 to output them to a control circuit 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display control apparatus and a display control method using a color plasma display, and more particularly to a display control apparatus using a color plasma display for performing color gradation display by a subfield (SF) method. And a display control method.

[0002]

2. Description of the Related Art Conventionally, a color plasma display (hereinafter, referred to as a PDP) generally discharges an inert gas, excites a phosphor with vacuum ultraviolet light emitted by the inert gas, extracts visible light, and displays the extracted light. 3 to reproduce the desired color
It has a structure in which phosphors that emit red, green, and blue light corresponding to the primary colors are separately applied.

FIG. 6 is a diagram showing the structure of one display cell constituting a color plasma display according to the prior art.

The PDP is composed of a plurality of display cells, and the display cells are constituted by opposing a front substrate 1 and a rear substrate 5 of an insulating substrate made of glass disposed on the front and rear surfaces, respectively. On the front substrate 1, a transparent electrode IT
A surface discharge electrode pair composed of a scan electrode 2a made of O or Nesa film and a sustain electrode 2b is formed.
a, a bus electrode 3 made of a metal electrode is formed on the sustain electrode 2b in order to reduce the resistance of these electrodes, and the bus electrode 3 is usually a Cr / Cu / Cr laminated thin film electrode or a thick film electrode of Ag. Used. Further, scan electrode 2a and sustain electrode 2b are covered with dielectric layer 4, and low dielectric glass is usually used for dielectric layer 4. Further, on the dielectric layer 4, MgO (not shown) is used for the purpose of preventing damage due to ions and electrons generated by the discharge and lowering the discharge voltage.
The film is formed as a protective film with a thickness of about 0.5 μm to 1 μm by vacuum deposition.

On the other hand, the rear substrate 5 has the scanning electrodes 2
a, the data electrode 6 is formed of a thick film of Ag or the like in a direction orthogonal to the sustain electrode 2b, and is a glass paste obtained by mixing a white oxide (alumina, titanium oxide, etc.) powder and a low melting point lead glass powder or the like. Is printed and baked to form a white dielectric layer 7. The white dielectric layer 7 has a purpose of reflecting visible light emitted from the phosphor and guiding it toward the front surface side to increase the efficiency of visible light emission. Further, on the white dielectric layer 7, three kinds of phosphors 8 for converting ultraviolet light from gas discharge into visible light of three colors of red, green and blue are provided.
Is applied separately by thick film printing technology. The front substrate 1 and the rear substrate 5 are opposed to each other with a gap of 100 μm to 200 μm via a not-shown partition made of a grid-like or stripe-like insulator to form a discharge cell 9, and helium and neon are contained therein. , Xenon and a mixed gas thereof are filled with a discharge gas. The partition is formed by a thick film technique using a mixture of alumina, magnesium oxide, titanium oxide and the like and lead glass.

[0006] The PDP comprising the display cell having the above structure is as follows.
The three primary color lights are taken out of the phosphor with an intensity corresponding to the input signal and mixed to obtain a desired emission color.

FIG. 7 is a block diagram showing the configuration of a display control device according to the prior art, and FIG. 8 is a diagram for explaining a display control method according to the prior art.

As shown in FIG. 7, the PDP is driven by a control signal from a control circuit, and the control signal is output in accordance with the luminance of input signals Sr, Sg, and Sb of three primary colors of red, green, and red. The desired gradation display image is obtained by combining the light emission from the phosphors of the three primary colors by the position and the luminance. That is, three types of phosphors (red, red, green, and blue) that emit light in three primary colors according to the input signals Sr, Sg, and Sb, respectively.
Green, blue, and their color coordinates are r, g, and b).
One pixel is formed as a set, and the brightness of each color is controlled to reproduce and display the color.

The gradation display of each color is performed according to a subfield (SF) method as shown in FIG. The gradation display in the subfield (SF) method is realized by controlling the number of discharges (light emission luminance) in the sustain period as shown in FIG. One field (F) for displaying one screen is repeated about 50 to 70 times per second. According to this, the screens of the respective fields are stacked by the afterimage of the human eye, and a natural image without flicker can be obtained. The one-field period is divided into a plurality of subfields (SF), the number of sustain pulses (the number of discharges) in the sustain period of each subfield is changed, and the subfields are combined to realize gray scale display. 64
In the gradation display, one field is composed of six subfields, and a preliminary discharge period, a writing period, and a sustain period are provided at the head of each subfield. The number of discharges in the sustain period is weighted by decreasing the number of discharges by about 1/2 in order from the first subfield (SF1 is the number of discharges of 32n, where n is a positive integer), and the above-mentioned subfields are replaced in one frame. When the sustain discharge is selected, the light emission luminance can be controlled by the number of sustain discharges in the selected subfield, so that 64-gradation display can be realized.

For example, when expressing white with maximum brightness,
The input signals Sr, Sg, Sb are each maximized and 3
Each of the primary colors selectively emits light in all of SF1 to SF6. When expressing white with half luminance, the input signals Sr, Sg, and Sb become そ れ ぞ れ, respectively, and each of the three primary colors selectively emits SF1. As described above, the combination of SFs according to the input signals is performed with the three primary colors to reproduce and display the colors.

Next, the color reproduction range in the case of reproducing a desired color in the prior art will be described with reference to FIG. FIG.
FIG. 2 is a diagram for explaining a color reproduction range of a color plasma display according to the related art.

When the three primary color lights R1, G1, and B1 are used, a color in a triangular area connecting them can be reproduced.
All colors existing in the natural world can be reproduced as faithfully as possible.
The SC signal system) uses R2, G2, and B2 as three primary colors, and thus reproduces the area of the triangles R2, G2, and B2 in principle. Further, as shown by R3, G3, and B3, the current CRT is particularly inferior in color purity in green emission compared to NTSC green. For this reason, the CRT has realized a natural color reproduction by correcting such a defect by using a camera or a γ characteristic of the CRT in the past commercialization.

On the other hand, in order for the PDP to obtain the widest possible color reproduction range in the current NTSC signal system, red, green,
The emission colors of the respective blue phosphors are represented by three primary colors of the NTSC signal system, R2 (color coordinates x = 0.67, y = 0.33), G2
(Color coordinates x = 0.21, y = 0.71), it is necessary to make the emission color equal to B2 (color coordinates x = 0.14, y = 0.08), and the PDP excites vacuum ultraviolet light. Since photoluminescence (PL) is used as the light source, at present, the phosphors whose luminous efficiency is at a practical level are limited.
As shown by r, g, and b in FIG. 2, the red color indicates the triggered ribolate (color coordinates x = 0.634, y = 0.35).
5) The green color is zinc manganese manganese (color coordinates x =
0.238, y = 0.699), blue is a value of magnesium magnesium aluminate (color coordinates x = 0.147, y
= 0.077) is generally used.

Recently, a value aluminate-based green phosphor having a color purity higher than that of NTSC green (color coordinates x = 0.
145, y = 0.747), and the emission color of this phosphor is almost an ideal color as green of the three primary colors as shown by G in FIG. When reproducing white, a more vivid and natural color than ever before can be obtained.

[0015]

However, the prior art includes a PDP driven by an NTSC signal system.
Value aluminate green phosphor (color coordinate x =
0.145, y = 0.747), that is, if primary colors having higher color purity than the three primary colors of the NTSC signal system are used, the NTS
Since the C signal system is broadcast by signal processing adapted to the CRT, the reproduction of natural blue and white such as blue sky and snow has the advantage of obtaining unprecedented vivid and natural colors. There is a problem in that the green color of natural trees and the like becomes bluish and unnatural.

The present invention has been made in view of the above problems, and an object of the present invention is to use a primary color having higher color purity than the three primary colors of the NTSC signal system in a PDP driven by the NTSC signal system. However, in the reproduction of natural blue and white such as blue skies and snow, the advantage of obtaining unprecedented vivid and natural colors is maintained, and the green color of natural trees and the like becomes bluish. It is an object of the present invention to provide a display control device and a display control method capable of overcoming the disadvantage of becoming natural and obtaining a clear image with a wide color reproduction range.

[0017]

Means for Solving the Problems In order to solve the above problems, the present invention has the following constitution. The gist of the invention according to claim 1 is to provide a display cell on which a red phosphor, a green phosphor, and a blue phosphor are applied based on input signals corresponding to three primary colors of red, green, and blue, respectively. A display control device that emits light to display a color image, wherein a color mixture instructing unit that instructs a color mixture of the primary color corresponding to the input signal and another primary color, and a color mixture instruction by the color mixture instruction unit. A display cell light emitting means for emitting light from the display cells corresponding to the primary colors corresponding to the input signal and the other primary colors for which color mixing has been instructed by the color mixing instructing means. Exists in the device. Further, the gist of the invention according to claim 2 is provided with light emission luminance detecting means for detecting light emission luminance of the input signal, and the color mixing instruction means is configured to perform other light emission luminance detection in accordance with the light emission luminance detected by the light emission luminance detection means. 2. The display control device according to claim 1, wherein the ratio of the color mixture with the primary color is changed. The gist of the invention described in claim 3 is that the color mixture instructing means increases the proportion of color mixture with the primary color in proportion to the light emission luminance detected by the light emission luminance detection means. 3. The display control device according to 1 or 2. The gist of the invention described in claim 4 is that the light emission luminance detecting means detects the light emission luminance of at least two of the input signals among the input signals, and the color mixing instruction means is provided by the light emission luminance detection means. In addition to increasing the proportion of color mixture with the primary color in proportion to the emission luminance of one of the detected input signals, and in proportion to the emission luminance of the other input signal detected by the emission luminance detection means. The display control device according to any one of claims 1 to 3, wherein a ratio of suppressing the color mixture with the primary color is increased. The gist of the invention according to claim 5 is that the input signal is an NTSC signal system, and at least one of the red phosphor, the green phosphor, and the blue phosphor is an NTSC signal system. 2. The apparatus according to claim 1, wherein a phosphor having a higher color purity than the three primary colors is used, and the color mixture instructing unit instructs the input signal for emitting the phosphor having the higher color purity to perform a color mixture.
5. The display control device according to any one of claims 1 to 4, wherein The gist of the invention according to claim 6 resides in a display control device according to any one of claims 1 to 5, wherein a value aluminate-based green phosphor is used as the green phosphor. The gist of the invention described in claim 7 is that the color mixing instruction means instructs the input signal corresponding to the green color to be mixed with the red color. The present invention resides in the display control device described above. The gist of the invention according to claim 8 is that the light emission luminance detection means detects the light emission luminance of the input signal corresponding to the green color, and the color mixing instruction means detects the light emission luminance detected by the light emission luminance detection means. The display control device according to any one of claims 1 to 7, wherein a ratio of a color mixture with the red color is changed according to the light emission luminance of the input signal corresponding to green. The gist of the invention according to claim 9 is that the light emission luminance detecting means detects the light emission luminance of the input signal corresponding to the green color and the light emission luminance of the input signal corresponding to the blue color, and Instructing means increases the proportion of color mixture with the red in proportion to the light emission luminance of the input signal corresponding to the green color detected by the light emission luminance detection means, and is detected by the light emission luminance detection means. The display control device according to any one of claims 1 to 8, wherein a ratio of suppressing color mixture with the red color is increased in proportion to the emission luminance of the input signal corresponding to the blue color.
The gist of the invention according to claim 10 is a display cell in which a red phosphor, a green phosphor, and a blue phosphor are applied based on input signals corresponding to three primary colors of red, green, and blue, respectively. Are respectively emitted to display a color image, wherein a color mixture of the primary color corresponding to the input signal and the other primary colors is instructed, and based on the instruction of the color mixture, the input signal is responded to. The display cells corresponding to the primary colors to be mixed and the other primary colors for which color mixing has been instructed by the color mixing instructing means. The gist of the invention described in claim 11 is that the light emission luminance of the input signal is detected, and the ratio of the color mixture with the other primary colors changes according to the detected light emission luminance. The present invention resides in the display control method described above.
The gist of the invention according to claim 12 resides in a display control method according to claim 10 or 11, wherein the ratio of the color mixture with the primary color is increased in proportion to the detected light emission luminance. The gist of the invention according to claim 13 is to detect the light emission luminance of at least two of the input signals of the three primary colors, and to be proportional to the light emission luminance of the detected one input signal. 11. The method according to claim 10, further comprising: increasing the proportion of the mixed color with the primary color and increasing the proportion of suppressing the mixed color with the primary color in proportion to the emission luminance of the detected other input signal. 12
The display control method according to any one of the above. The gist of the invention according to claim 14 is that the input signal is an NTSC signal system, and at least one of the red phosphor, the green phosphor, and the blue phosphor is the NTSC signal system. The display according to any one of claims 10 to 13, wherein a phosphor having higher color purity than a primary color is used, and color mixing is instructed with respect to the input signal for causing the phosphor having higher color purity to emit light. It lies in the control method. Claim 15
The gist of the present invention resides in a display control method according to any one of claims 10 to 14, wherein a green phosphor of a value aluminate type is used as the green phosphor. The gist of the invention described in claim 16 is that the input control signal corresponding to the green color is instructed to be mixed with the red color. Exist. Further, the gist of the invention according to claim 17 is to detect the light emission luminance of the input signal corresponding to the green color, and mix the color with the red light according to the detected light emission luminance of the input signal corresponding to the green color. The display control method according to any one of claims 10 to 16, wherein the ratio of the display control changes. Claim 1
The gist of the invention described in claim 8 is to detect the light emission luminance of the input signal corresponding to the green color and the light emission luminance of the input signal corresponding to the blue color, and detect the input signal corresponding to the detected green color. The proportion of the color mixture with the red is increased in proportion to the emission luminance, and the proportion of the suppression of the color mixture with the red is increased in proportion to the emission luminance of the input signal corresponding to the detected blue. A display control method according to any one of claims 10 to 17, characterized in that: The gist of the present invention resides in a storage medium storing a program capable of executing the display control method according to any one of claims 10 to 18.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing a configuration of an embodiment of a display control device according to the present invention. FIG. 2 is a block diagram showing a first embodiment of the display control device according to the present invention. FIG. 4 is a diagram showing a color reproduction range and color coordinates of emission colors of phosphors used.

The first embodiment includes a light emission luminance detection circuit 10 for detecting the light emission luminance of each of the three primary color input signals Sr, Sg, and Sb of the NTSC signal system, and a light emission luminance detection circuit 1
Input signal S of three primary colors based on the emission luminance detected at 0
a conversion circuit 20 for converting r, Sg, Sb into conversion signals Sr ′, Sg ′, Sb ′, and a control for outputting a display control signal based on the conversion signals Sr ′, Sg ′, Sb ′ converted by the conversion circuit 20 The color plasma display (hereinafter, referred to as PDP) 40 includes a circuit 30 and a panel section for displaying an image and a driving circuit for driving the panel section based on a display control signal from the control circuit 30. The input signal Sr and the conversion signal Sr 'correspond to the three primary colors red, the input signal Sg and the conversion signal Sg' correspond to the three primary colors green, and the input signal Sb and the conversion signal Sb '
Corresponds to the primary color blue.

The light emission luminance detecting circuit 10 detects the light emission luminance of each of the input signals Sr, Sg, and Sb of the three primary colors of the NTSC signal system, that is, which of the 64 gradations by the subfield (SF) method. And outputs a conversion control signal indicating the light emission luminance.

The conversion circuit 20 converts the input signals Sr, Sg, Sb of the three primary colors of the NTSC signal system with other primary colors based on the conversion control signal from the light emission luminance detection circuit 10, and converts the converted signals Sr ', Sg',. Sb ′ is generated and output to the control circuit 30.

The control circuit 30 generates a display control signal based on the converted signals Sr ′, Sg ′, Sb ′ from the conversion circuit 20 and outputs the display control signal to the PDP 40.

As shown in FIG. 2, the PDP 40 has three primary color coordinates r (color coordinates x = 0.64) using phosphor-triggered ribolate as the red light emission color coordinates.
3, y = 0.355) and color coordinates G using a value aluminate-based green phosphor as color coordinates of green light emission of the three primary colors (color coordinates x = 0.145, y = 0.747)
And a panel section composed of color coordinates b (color coordinates x = 0.147, y = 0.077) using phosphor barium magnesium aluminate as color coordinates of blue light emission of the three primary colors, And a drive circuit for driving by a field (SF) method to display 64 gradations.

Next, the operation of the first embodiment will be described in detail with reference to FIG. FIG. 3 is a diagram showing a first conversion example from an input signal to a conversion signal in the conversion circuit shown in FIG.

In the first embodiment, the 3
Since the red and blue primaries have the same r and b color coordinates as the NTSC signal system red and blue R2 and B2, the input signals Sr and Sb are used without being converted by the conversion circuit 20, and are used as green. Since the color coordinate G is outside the green color of the NTSC signal system, the input signal Sg is converted by the conversion circuit 20 so as to obtain this characteristic, and a converted signal signal Sg ′ for mixing red is obtained.

The light emission luminance detection circuit 10 detects the light emission luminance of the input signal Sg and outputs a conversion control signal indicating the detected light emission luminance of the input signal Sg. The conversion circuit 20 converts the input signal Sg into a conversion signal Sg ′ that emits red light at a fixed ratio proportional to the conversion control signal indicating the light emission luminance. That is, the higher the luminance of the input signal Sg, the higher the luminance of the red phosphor to emit light. Note that the conversion signal Sg ′ is
This signal detects the luminance of the input signal Sg, emits the green phosphor of the color coordinate G and the red phosphor of the color coordinate r in the same frame, and mixes the colors to obtain the light emission of the color coordinate g.

With reference to FIG. 3, a description will be given of a combination of two subfields, that is, when the input signal Sg has the maximum luminance and when it is 1/2.

When the input signal Sg has the maximum luminance,
The light emission luminance detection circuit 10 detects that the luminance is the maximum, and outputs a conversion control signal that notifies the conversion circuit 20 that the luminance is the maximum. The conversion circuit 20 converts the input signal Sg into the subfields SF1G, SF2G, and S2G for causing the green phosphor of the color coordinates G to emit light based on the conversion control signal from the light emission luminance detection circuit 10 indicating that the luminance is the maximum.
A signal for selecting SF3G, SF5G, and SF6G, and a subfield S for causing the red phosphor with the color coordinate r to emit light.
F4r is converted into a conversion signal Sg ′ having a signal for selecting F4r and output to the control circuit 30.

When the input signal Sg has a half luminance, the light emission luminance detecting circuit 10 detects that the luminance is a half luminance, and informs the conversion circuit 20 that the luminance is the half luminance. Output a signal. The conversion circuit 20 converts the input signal Sg into sub-fields SF2G and S2G for causing the green phosphor of the color coordinates G to emit light based on the conversion control signal indicating that the luminance is 1/2 from the light emission luminance detection circuit 10.
A signal for selecting F3G, SF4G, and SF6G, and a subfield SF for causing the red phosphor having the color coordinate r to emit light.
5r is converted into a conversion signal Sg ′ having a signal for selecting 5r and output to the control circuit 30.

As described above, according to the first embodiment of the present invention, in a PDP driven by the NTSC signal system, even if primary colors having higher color purity than the three primary colors of the NTSC signal system are used, the blue sky and the In natural blue and white reproduction such as snow,
Maintaining the unprecedented advantage of being able to obtain vivid and natural colors, overcoming the disadvantage of green trees such as natural trees becoming bluish and unnatural, and obtaining clear images with a wide color reproduction range It has the effect of being able to do so.

Further, according to the first embodiment of the present invention, when reproducing green with high luminance, the color coordinates are closer to r, and when reproducing green with low luminance, it is closer to the color coordinates of G. Since the color mixture is selected, the color reproduction range of the area A shown by hatching in FIG. 2 is broadened as compared with the related art, and the effect that dark green or slightly greenish images become clearer is achieved.

(Second Embodiment) In the second embodiment, the function of the input signal Sg is defined in the conversion circuit 20, and
The input signal Sg is converted into a signal S by a defined function.
This is different from the first embodiment in that it is converted to g ′. That is, in the first embodiment, the light emission luminance of the input signal Sg is detected and converted into the conversion signal Sg ′ that emits red light at a constant rate proportional to this luminance. The percentage of red to be applied is defined as a function of the input signal Sg.

According to the second embodiment, although the conversion is complicated, the color reproduction range can be controlled more precisely.

(Third Embodiment) FIG. 4 is a diagram showing a third conversion example from an input signal to a conversion signal in the conversion circuit shown in FIG. 1, and FIG. 5 is a diagram showing a display control device according to the present invention. FIG. 13 is a diagram illustrating a color reproduction range and color coordinates of emission colors of phosphors used in a third embodiment.

In the third embodiment, the light emission luminance detecting circuit 10 converts the input signal S in the conversion circuit 20 in accordance with the first and second light emission luminances of the two primary color input signals Sr, Sg and Sb.
r, Sg, and Sb are converted signals Sr ′ obtained by mixing other primary colors.
It is different from the first embodiment in that it is converted into Sg ′ and Sb ′.
Other configurations are the same as those of the first embodiment.

In the conversion circuit 20, the input signals Sr, Sg,
Sb is mixed with other primary colors at a fixed ratio in proportion to the first light emission luminance detected by the light emission luminance detection circuit 10,
The conversion signals Sr ′, Sg ′, which suppress color mixing of other primary colors in proportion to the second emission luminance detected by the emission luminance detection circuit 10,
Convert to Sb '.

In the third embodiment, as in the first embodiment, only the input signal Sg is converted by the conversion circuit 20 to obtain a converted signal Sg 'for mixing red. First, the light emission luminance detection circuit 10
Detects the emission luminance of the input signal Sg and the input signal Sb, and outputs a conversion control signal indicating the emission luminance of the detected input signal Sg and input signal Sb, respectively. Conversion circuit 20
Causes the input signal Sg to emit red at a constant rate proportional to the conversion control signal indicating the emission luminance of the input signal Sg, and suppresses the emission of red light in proportion to the conversion control signal indicating the emission luminance of the input signal Sb. Is converted to the converted signal Sg ′. That is, the higher the luminance of the input signal Sg, the higher the luminance of the red phosphor to emit light, and the higher the luminance of the input signal Sb, the lower the luminance of the red phosphor to emit light.

Referring to FIG. 4, the input signal Sg and the input signal Sb have the maximum luminance, the input signal Sg has the maximum luminance and the input signal Sb has the luminance of 1/2, and the input signal Sg has the maximum luminance. A combination of four subfields will be described, namely, the case where the input signal Sb has the maximum luminance at 1/2 and the case where the input signal Sg and the input signal Sb have the luminance of 1/2.

If the input signal Sg and the input signal Sb have the maximum luminance, the light emission luminance detecting circuit 10
g is detected to have the maximum luminance, a conversion control signal for notifying that the input signal Sg is the maximum luminance is output to the conversion circuit 20, and it is detected that the input signal Sb is the maximum luminance. Outputs a conversion control signal indicating that the input signal Sb has the maximum luminance. The conversion circuit 20 converts the input signal Sg into the green phosphor of the color coordinate G based on the conversion control signal indicating that the input signal Sg and the input signal Sb from the light emission luminance detection circuit 10 have the maximum luminance. Subfields SF1G, SF2
A signal for selecting G, SF3G, SF4G, SF5G, SF6G, that is, a signal that is not converted is output to the control circuit 30 as a converted signal Sg ′.

Next, when the input signal Sg has the maximum luminance and the input signal S
If b is half the luminance, the light emission luminance detection circuit 10
Detects that the input signal Sg has the maximum luminance, outputs a conversion control signal indicating that the input signal Sg has the maximum luminance to the conversion circuit 20, and determines that the input signal Sb has the luminance of 1/2. Detects and outputs a conversion control signal to the conversion circuit 20 to inform that the input signal Sb has a luminance of 1/2. The conversion circuit 20 receives an input signal Sg from the light emission luminance detection circuit 10 based on a conversion control signal notifying that the input signal Sb has the maximum luminance and a conversion control signal indicating that the input signal Sb has the luminance of 1/2. A subfield SF for emitting the signal Sg from the green phosphor of the color coordinate G
A conversion signal Sg ′ having a signal for selecting 1G, SF2G, SF3G, SF4G, and SF5G and a signal for selecting a subfield SF6r for emitting the red phosphor with the color coordinate r is output to the control circuit 30. I do.

Next, when the input signal Sg has a luminance of 1/2 and the input signal Sb has a maximum luminance, the light emission luminance detecting circuit 10
Detects that the input signal Sg has a luminance of 、, outputs a conversion control signal notifying that the input signal Sg has a luminance of に to the conversion circuit 20, and outputs the input signal Sb
Is detected to have the maximum luminance, and a conversion control signal for notifying that the input signal Sb has the maximum luminance is output to the conversion circuit 20. The conversion circuit 20 receives an input signal Sg from the light emission luminance detection circuit 10 based on a conversion control signal notifying that the luminance is 1/2 and a conversion control signal indicating that the input signal Sb has the maximum luminance. A subfield SF for emitting the signal Sg from the green phosphor of the color coordinate G
A signal for selecting 2G, SF3G, SF4G, SF5G, and SF6G, that is, a signal that is not converted is output to the control circuit 30 as a converted signal Sg ′.

Next, when the input signal Sg and the input signal Sb have a luminance of 1/2, the light emission luminance detecting circuit 10 detects that the input signal Sg has a luminance of 1/2, and
0, a conversion control signal indicating that the input signal Sg has a luminance of １ ／, and an input signal Sb having a luminance of 1
/ 2, and input the input signal Sb to the conversion circuit 20.
Output a conversion control signal notifying that the luminance is 1/2. The conversion circuit 20 emits the green phosphor of the color coordinate G based on the conversion control signal indicating that the input signal Sg and the input signal Sb from the light emission luminance detection circuit 10 have a luminance of １ ／. Subfield S
A conversion signal S having a signal for selecting F2G, SF3G, SF4G, and SF5G and a signal for selecting a subfield SF6r for emitting a red phosphor with color coordinates r.
g ′ and output to the control circuit 30.

As described above, according to the third embodiment of the present invention, the green color coordinate g, which is one of the three primary colors at the time of displaying an image, is replaced by the green phosphor having the color coordinate G and the color coordinate r. 5 can be obtained by mixing the red phosphors in the same frame to emit light, and the mixed red light emission can be suppressed by the luminance of blue. Has an effect that the color reproduction range can be expanded, and a vivid and natural expression can be obtained, particularly when displaying the blue sky or the sea.

It is apparent that the present invention is not limited to the above embodiments, and that the embodiments can be appropriately modified within the scope of the technical idea of the present invention. Further, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, but can be set to numbers, positions, shapes, and the like suitable for carrying out the present invention. In the drawings, the same components are denoted by the same reference numerals.

[0046]

According to the display control apparatus and the display control method of the present invention, in a PDP driven by an NTSC signal system, N
Even if primary colors with better color purity than the three primary colors of the TSC signal system are used, it is possible to reproduce natural blue and white such as blue skies and snow while maintaining the advantage of obtaining unprecedented vivid and natural colors. Thus, the disadvantage that the green color of natural trees and the like becomes bluish and unnatural can be overcome, and a clear image with a wide color reproduction range can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a display control device according to the present invention.

FIG. 2 is a diagram showing a color reproduction range and color coordinates of emission colors of phosphors used in a first embodiment of the display control device according to the present invention.

3 is a diagram illustrating a first conversion example from an input signal to a conversion signal in the conversion circuit illustrated in FIG. 1;

FIG. 4 is a diagram illustrating a second example of conversion from an input signal to a conversion signal in the conversion circuit illustrated in FIG. 1;

FIG. 5 is a diagram showing a color reproduction range and color coordinates of emission colors of phosphors used in a third embodiment of the display control device according to the present invention.

FIG. 6 is a diagram showing a configuration of one display cell configuring a color plasma display according to the related art.

FIG. 7 is a block diagram illustrating a configuration of a display control device according to the related art.

FIG. 8 is a diagram for explaining a display control method according to the related art.

FIG. 9 is a diagram for explaining a color reproduction range of a color plasma display according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front substrate 2a Scan electrode 2b Sustain electrode 3 Bus electrode 4 Dielectric layer 5 Back substrate 6 Data electrode 7 White dielectric layer 8 Phosphor 9 Discharge cell 10 Light emission luminance detection circuit 20 Conversion circuit 30 Control circuit 40 Color plasma display (PDP) )

Claims (19)

[Claims] 1. A display cell on which a red phosphor, a green phosphor, and a blue phosphor are applied, respectively, based on input signals corresponding to three primary colors of red, green, and blue, respectively, to emit light. A display control device for displaying an image, comprising: a color mixture instructing unit for instructing a color mixture of the primary color corresponding to the input signal and another primary color; and the input signal based on a color mixture instruction by the color mixture instruction unit. And a display cell light emitting means for causing the display cells corresponding to the other primary colors for which the color mixing is instructed by the color mixing instructing means to emit light. 2. The apparatus according to claim 1, further comprising: a light emission luminance detecting unit configured to detect a light emission luminance of the input signal, wherein the color mixing instruction unit performs color mixing with the other primary colors according to the light emission luminance detected by the light emission luminance detection unit. 2. The display control device according to claim 1, wherein a ratio of the display control device is changed. 3. The display according to claim 1, wherein the color mixture instructing unit increases a ratio of the color mixture with the primary color in proportion to the light emission luminance detected by the light emission luminance detection unit. Control device. 4. The light emission luminance detection means detects the light emission luminance of at least two of the input signals among the input signals, and the color mixing instruction means detects one of the input signals detected by the light emission luminance detection means. While increasing the proportion of the color mixture with the primary color in proportion to the light emission luminance of the input signal, the color mixture with the primary color in proportion to the light emission luminance of the other input signal detected by the light emission luminance detection means. The display control device according to claim 1, wherein the suppression ratio is increased. 5. The input signal has an NTSC signal system, and at least one of the red phosphor, the green phosphor, and the blue phosphor has a color higher than the three primary colors of the NTSC signal system. 5. The method according to claim 1, wherein a high-purity phosphor is used, and the color mixing instruction unit causes the input signal for emitting the high-color purity phosphor to instruct color mixing. 6. Display control device. 6. The display control device according to claim 1, wherein a value alumina green phosphor is used as the green phosphor. 7. The display control device according to claim 1, wherein said color mixture instructing unit instructs said input signal corresponding to said green color to be mixed with said red color. 8. The light emission luminance detection means detects the light emission luminance of the input signal corresponding to the green color, and the color mixing instruction means detects the input light corresponding to the green color detected by the light emission luminance detection means. The display control device according to claim 1, wherein a ratio of a color mixture with the red color is changed according to the light emission luminance of the signal. 9. The light emission luminance detecting means detects the light emission luminance of the input signal corresponding to the green color and the light emission luminance of the input signal corresponding to the blue color. The proportion of the color mixture with the red color is increased in proportion to the light emission luminance of the input signal corresponding to the green color detected by the luminance detection means, and the color corresponding to the blue color detected by the light emission luminance detection means is increased. 9. The display control device according to claim 1, wherein a ratio of suppressing the color mixture with the red color is increased in proportion to the emission luminance of the input signal. 10. A display cell to which a red phosphor, a green phosphor, and a blue phosphor are applied, respectively, based on input signals corresponding to three primary colors of red, green, and blue, respectively, to emit light. A display control method for displaying an image, wherein a mixed color of the primary color corresponding to the input signal and another primary color is instructed, and based on the mixed color instruction, the primary color corresponding to the input signal; and A display control method, characterized in that the display cells corresponding to the other primary colors for which color mixing has been instructed by the color mixing instructing means emit light. 11. The display control method according to claim 10, wherein a light emission luminance of the input signal is detected, and a ratio of color mixture with the other primary colors changes according to the detected light emission luminance. 12. The display control method according to claim 10, wherein a ratio of a color mixture with the primary color is increased in proportion to the detected light emission luminance. 13. The light emitting luminance of at least two of the input signals of the three primary colors is detected, and color mixing with the primary colors in proportion to the detected light emitting luminance of the one input signal. 13. The method according to claim 10, further comprising: increasing the ratio of suppressing the color mixture with the primary color in proportion to the emission luminance of the detected other input signal. Display control method. 14. The input signal is an NTSC signal system, and at least one of the red phosphor, the green phosphor, and the blue phosphor has a color purity higher than the three primary colors of the NTSC signal system. The color mixing is instructed with respect to the input signal that causes the phosphor having high color purity to emit light by using a high phosphor.
3. The display control method according to any one of 3. 15. The display control method according to claim 10, wherein a green phosphor of a value aluminate type is used as the green phosphor. 16. The display control method according to claim 10, wherein the input signal corresponding to the green color is instructed to be mixed with the red color. 17. The method according to claim 17, wherein the light emission luminance of the input signal corresponding to the green color is detected, and a mixing ratio with the red color changes according to the detected light emission luminance of the input signal corresponding to the green color. The display control method according to any one of claims 10 to 16, wherein: 18. The light emission luminance of the input signal corresponding to the green is detected by detecting the light emission luminance of the input signal corresponding to the green and the light emission luminance of the input signal corresponding to the blue. And increasing the proportion of suppressing the color mixture with the red in proportion to the emission luminance of the input signal corresponding to the detected blue color, while increasing the proportion of the color mixture with the red in proportion to. The display control method according to any one of claims 10 to 17, wherein 19. A storage medium storing a program capable of executing the display control method according to claim 10. Description: