JP2003202838A - Display device - Google Patents

Display device

Info

Publication number
JP2003202838A
JP2003202838A JP2002307386A JP2002307386A JP2003202838A JP 2003202838 A JP2003202838 A JP 2003202838A JP 2002307386 A JP2002307386 A JP 2002307386A JP 2002307386 A JP2002307386 A JP 2002307386A JP 2003202838 A JP2003202838 A JP 2003202838A
Authority
JP
Japan
Prior art keywords
light emitting
emitting element
luminance
light
storage means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002307386A
Other languages
Japanese (ja)
Inventor
Noritoshi Hayashi
Akira Inoguchi
Norihiko Okazaki
Shinya Sato
Hirotomo Yaegashi
晋也 佐藤
寛朋 八重樫
紀彦 岡崎
紀寿 林
彰 猪口
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2001-334197 priority Critical
Priority to JP2001334197 priority
Application filed by Matsushita Electric Ind Co Ltd, 松下電器産業株式会社 filed Critical Matsushita Electric Ind Co Ltd
Priority to JP2002307386A priority patent/JP2003202838A/en
Publication of JP2003202838A publication Critical patent/JP2003202838A/en
Application status is Pending legal-status Critical

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/04Maintaining the quality of display appearance
    • G09G2320/043Preventing or counteracting the effects of ageing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0666Adjustment of display parameters for control of colour parameters, e.g. colour temperature

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which can display a picture etc. with constant chromaticity and luminance without taking any measurement even if a light emitting element deteriorates in luminance. <P>SOLUTION: The display device comprises a light emitting element group 12 composed of a plurality of arrays of light emitting elements 11a to 11c, a coefficient storage means 13 which stores a correction coefficient for increasing or decreasing the amounts of currents to the light emitting element group 12, a light emission control means 14 which makes the light emitting element group 12 emit light according to display data and the correction coefficient, an operation time storage means 22 which records an operation time, a setting storage means 23 which stores set values for controlling the light emission of the light emitting element group 12, and a display signal control means 24 which controls the light emission of the light emitting element group 12 according to the stored set values and display data; and luminance deterioration rates are calculated by using luminance deterioration curves and operation times by the light emitting elements 11a to 11c which are stored in the setting storage means 23 to find correction coefficients and the values of currents to the light emitting element group 12 are increased or decreased to adjust chromaticities of the light emitting elements 11a to 11c. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting element for a display device.
Long-term use of the device causes brightness degradation
Adjustment of the brightness and chromaticity of the displayed image
The present invention relates to a display device capable of: 2. Description of the Related Art A conventional display device has a light emitting element group before installation.
Adjust the brightness and chromaticity for each unit of
Ship after uniformity, screen due to brightness deterioration and ambient temperature
If there is a decrease in brightness or a change in chromaticity,
By manually changing the correction coefficient while watching the
The brightness of each unit was adjusted. In the control section
Red (R), green (G), blue (B)
Chromaticity adjustment by changing the light emission ratio of
The festival was going on. The color temperature is set as shown in FIG.
Set color temperature manually by setting coefficient
It has become. Means for solving the problem of manual adjustment and
For this purpose, the information of the luminance degradation is stored in the storage means, and the
The constant image quality can be maintained by performing automatic adjustments periodically.
Has been proposed (for example, see Patent Document 1). FIG. 13 shows an adjustment system for this display device.
As shown in FIG.
02 and the anode current drops
Of the luminance of the CRT 101 caused by the
The detecting means 102 detects
Based on the result, the control means (table selection means) 103
Storage means 10 storing a plurality of correction gradation conversion tables
4 to select a desired correction gradation conversion table.
By this, the gradation correction means 105
The tone of the image signal S is converted by the tone conversion table.
Swelling. [Patent Document 1] Japanese Patent Application Laid-Open No. 09-146513 [0005] However, this is not the case.
In such conventional display devices, adjust the chromaticity and brightness
Do not perform measurements such as detecting the anode current each time.
Had to be done. It is not possible to adjust the brightness of the entire screen.
However, it is composed of multiple units arranged side by side.
If the power consumption of each unit is different
In this case, a difference in luminance degradation occurs for each unit,
Color unevenness and brightness unevenness.
The problem is that it cannot be adjusted with conventional display devices.
There was a title. Further, in the conventional display device, the light emitting element
Because the tendency of luminance degradation differs for each color,
It is said that chromaticity also changes as luminance degradation occurs
There was a problem. Further, the luminance of the light emitting element changes with temperature.
May be affected by the ambient temperature of the display device.
As mentioned above, the problem that the luminance and chromaticity change
there were. Further, regarding the coefficient for setting the color temperature,
Since the same coefficient is used regardless of the degree,
The chromaticity changes due to the temperature difference that occurs when
There was a problem of getting around. [0010] The present invention is to solve such a problem.
Chromaticity and constant chromaticity without measurement
Provide a display device capable of displaying an image or the like with luminance
Things. A display device according to the present invention has multiple
A light emitting element group comprising an array of light emitting elements,
Stores coefficients for adjusting the image displayed by the child group
Coefficient storage means for displaying an image on the light emitting element group
Display data and stored in the coefficient storage means.
Light emission control means for causing the light emitting element group to emit light based on a coefficient
At the time of operation to store the operation time since the start of operation
Memory means for controlling light emission of the light emitting element group.
Setting storage means for storing a set value; and
Based on the stored set values and the display data,
Display signal control means for controlling light emission of the light emitting element.
The light emission control means is stored in the operation time storage means.
Controlling the light emission of the plurality of light emitting elements using the set operation time
Configuration. With such a configuration, the luminance of the light emitting element is poor.
3 types of light emitting elements even if chromaticity changes due to
Each brightness from each brightness degradation curve and operation time
The luminance degradation ratio, and determine if the luminance degradation ratio of each element is equal.
The correction coefficient can be adjusted to
Automatically adjust the chromaticity that has changed due to deterioration
it can. Therefore, the degree of deterioration of the light emitting element was measured.
You can display video etc. with a certain chromaticity even if you do not know
A display device can be provided. Further, the display device of the present invention is characterized in that
In addition to the specified items, the light emission control means may store the operation time.
Calculate the luminance degradation ratio for each light emitting element using a storage unit
In order to make the luminance deterioration ratios of the plurality of light emitting elements equal,
A configuration is provided in which light emission of the plurality of light emitting elements is controlled by a positive coefficient.
By doing so, a luminance degradation curve considering the average power
The luminance degradation ratio can be obtained from the operation time, and the
Color with higher accuracy
The degree can be adjusted. Further, the display device of the present invention is characterized in that
In addition to the specified items, the light emitting element groups
The coefficient notation for storing the current versus luminance characteristics of the light emitting element
Constructed by multiple units with storage means
An image display panel, wherein the coefficient storage means of each unit is provided.
Current versus luminance characteristics of the light emitting element stored in the
Using the average power information obtained by the force measuring means
The power consumption is calculated for each unit, and the calculation result and
Using the operation time information obtained from the operation time storage means
To determine the correction coefficient for each of the units
The current value is stored in the coefficient storage means, and the current value is calculated using the correction coefficient.
Control and adjust chromaticity for each unit
As a result, the brightness of the light emitting element
Can automatically adjust for the resulting chromaticity variations.
Display images with uniform image quality without color unevenness.
it can. At this time, the brightness calculated for each unit
The brightness of all other units to the lowest degradation ratio
The correction coefficient of each unit so as to match the deterioration ratio
Is obtained and stored in the coefficient storage means for each unit,
The current value is adjusted using the correction coefficient, and the
It is preferable to adjust the brightness of the image. Further, the display device of the present invention is characterized in that
In addition to the specified items, the luminance inferiority calculated for each unit
Brightness of all other units to the lowest
The correction coefficient of each unit is adjusted so that
And stores it in the coefficient storage means for each unit.
The current value is adjusted using the correction coefficient of
It has a configuration for adjusting luminance. This allows each unit
The chromaticity variation caused by the luminance degradation of the light emitting element
Adjustable automatically, uniform image quality without color unevenness
Can display an image or the like. Further, the display device of the present invention has a plurality of light emitting devices.
A light emitting element group consisting of an array of elements;
Coefficient storage for storing coefficients for adjusting the amount of current
Means and display for displaying an image or the like on the light emitting element group
Data and the coefficient stored in the coefficient storage means.
Light emission control means for causing the light emitting element group to emit light, and operation
Record the operation time from the start of
Operating time storage means for controlling light emission of the light emitting element group.
Setting storage means for storing setting values for
To the set value and the display data stored in the storage means.
Display signal control for controlling light emission of the light emitting element group based on
Means for controlling the ratio of the luminance of each color of the light emitting element group.
Stored in the setting storage means for adjusting the chromaticity by changing
By changing the set value, the current of the light emitting element is changed.
Configuration for controlling the values and adjusting the luminance and chromaticity of the light emitting element
have. With such a configuration, the luminance of the light emitting element is poor.
3 types of light emitting elements even if chromaticity changes due to
You can adjust the chromaticity by changing the brightness ratio of each.
The chromaticity that has changed due to the luminance degradation of the light-emitting element
Can be adjusted. Therefore, the deterioration of the light emitting element
Displays images etc. with a constant chromaticity without measuring the degree of
And a display device capable of performing the operation. Further, the display device of the present invention has a plurality of light emitting devices.
A light emitting element group consisting of an array of elements;
Coefficient storage means for storing the amount of current flowing through the light emitting element group;
Temperature measuring means for measuring an ambient temperature of the light-emitting element group
Set value for controlling light emission of the light emitting element and temperature of the light emitting element.
Setting storage means for storing degree-luminance characteristics, and the temperature measurement
Means for acquiring the ambient temperature and the setting storage means.
Each of the above based on the temperature versus luminance characteristics stored in the stage
The rate of change of the luminance of the light emitting element is calculated, and
A correction coefficient corresponding to the rate of change of the luminance of the optical element is obtained and
Stored in the number storage means, and stored in the setting storage means.
The set values and the display data stored and the
The light emitting element based on the correction coefficient stored in the number storage means.
Display signal control means for controlling the light emission of the child group.
The display signal control means is configured to output the signal based on the correction coefficient.
By adjusting the current value of the light emitting element, the luminance of the light emitting element
It has a configuration for controlling according to the ambient temperature. With such a configuration, the measured light emitting element
Measured based on group ambient temperature and temperature versus brightness characteristics
To control the brightness of the light-emitting element according to the ambient temperature,
A table that can maintain a constant brightness even when the temperature changes
An indicating device can be provided. Further, the display device of the present invention provides the display device of the present invention.
In addition to the specific matter, the light emitting element is a red light emitting element,
A green light emitting element and a blue light emitting element;
The constant storage means stores the temperature versus luminance characteristics of the light emitting elements of each of the colors.
The display signal control means stores the information of the ambient temperature.
And the light emitting element of each color based on
The change rate of the luminance of the child is calculated, and the calculated light emission of each color is calculated.
Calculating a correction coefficient for each color according to the change rate of the luminance of the element,
In addition to storing in the coefficient storage means,
The current value of each light emitting element of each color based on
And a configuration for controlling the color temperature of each of the light emitting elements.
You. With this configuration, the measured light emitting element
Based on ambient temperature of group and temperature-luminance characteristics for each emission color
Control the brightness of the light emitting element according to the measured ambient temperature.
Constant brightness or chromaticity even when the ambient temperature changes.
Can provide a display device that can be maintained
You. Further, the display device of the present invention is the display device of the present invention.
In addition to the specific items, the light emitting element groups are arranged in a row and a row.
Together with a plurality of units in which the coefficient storage means are provided.
Therefore, the image display board constructed, and the
Temperature measurement means for measuring the ambient temperature of the light emitting element group
Based on the information on the ambient temperature and the temperature-brightness characteristic.
Calculating the rate of change of the brightness of each of the light-emitting elements.
The correction coefficient corresponding to the change rate of the luminance of each of the light emitting elements is calculated.
At the same time as the coefficient storage means.
The current value of the light emitting element based on the
A configuration for controlling the luminance of the light emitting element for each unit.
You. With this configuration, measurement is performed for each unit.
Temperature vs. luminance characteristics for each light emitting color
Based on the measured ambient temperature
If the ambient temperature differs for each unit to control the brightness,
Display device that can maintain a constant brightness
Can be offered. Further, the display device of the present invention provides the display device of the present invention.
In addition to the specific items, the light emitting element groups are arranged in a row and a row.
Together with a plurality of units in which the coefficient storage means are provided.
Therefore, the image display board constructed, and the
Temperature measurement means for measuring the ambient temperature of the light emitting element group
The light emitting element is a red light emitting element, a green light emitting element.
And the setting storage means, comprising:
Stores the temperature versus luminance characteristics of the light-emitting elements of each of the colors,
The display signal control means controls the ambient temperature for each of the units.
Each color based on degree information and each temperature versus luminance characteristic
The change rate of the luminance of the light emitting element is calculated, and the calculated
The correction coefficient for each color is calculated according to the change rate of the luminance of the color light emitting element.
And store it in the coefficient storage means of the corresponding unit.
Based on the correction coefficient for each color for each unit,
The current value of each light emitting element of the color
It has a configuration for controlling the color temperature of the element. With such a configuration, the measured light emitting element
Based on ambient temperature of group and temperature-luminance characteristics for each emission color
Control the brightness of the light emitting element according to the measured ambient temperature.
Constant brightness or chromaticity even when the ambient temperature changes.
Can provide a display device that can be maintained
You. Further, the display device of the present invention provides the display device of the present invention.
In addition to the specific items, the setting storage means further includes a brightness setting.
Stores the setting coefficient for setting the color temperature for each fixed value,
The display signal control means controls the color corresponding to the designated luminance value.
Based on predetermined information of temperature, each light emitting element
The chromaticity is controlled for each designated luminance. With such a configuration, the color temperature corresponding to the luminance
Holds information to realize the degree and emits light based on it
Controls the light emission of the device, so even if the brightness changes
Color temperature suitable for temperature is realized, and temperature difference due to difference in brightness
Video can be displayed at a certain chromaticity without being affected by
It is possible to provide an efficient display device. Embodiments of the present invention will be described below.
This will be described with reference to the drawings. (First Embodiment) In FIG. 1 and FIG.
The unit comprises a unit 10 for displaying images and the like, and a display output thereof.
And a control unit 20 for controlling the
10 is a red light emitting element 11a, a green light emitting element 11b, and a blue light emitting element 11b.
A light source in which a plurality of pixels 11 composed of an array of optical elements 11c are provided
Stores the optical element group 12 and a correction coefficient for adjusting display.
And the like are displayed in the coefficient storage means 13 for storing
Data for indicating and correction stored in coefficient storage means 13
Light emission control means for causing the light emitting element group 12 to emit light based on the coefficient
The controller 20 controls the entire apparatus.
Manages the operation time from the start of use, etc.
Operating time storage means 22 and brightness of light emitting elements 11a to 11c
Stores setting values for adjusting the degree of deterioration curve and display
The setting storage means 23 and the settings stored in the setting storage means 23
The light emission of the unit 10 is controlled based on the fixed value and the video signal S.
And display signal control means 24 for controlling the display signal. In the control unit 20, the operation time storage means 22
Operating time information T of the display device, and based on the information T
From the luminance deterioration curve shown in FIG.
Luminance degradation ratio X% (the luminance at the start of operation is 100%)
%) (For example, 3000).
At 0 hours, the luminance degradation ratio becomes 50%). On the other hand, the light emitting element of the unit 10
(LEDs) 11a to 11c, as shown in FIG.
By increasing the amount of any rank A ~ C
Since the luminance is high, the light emitting element 1 of the light emitting element group 12
As shown in FIG. 5, the current flowing through 1a to 11c
Calculate display data and a correction coefficient to be given to the control means 14
The current value is determined by D / A conversion of the result.
Get. As shown in FIG. 6, the light emitting element 11a
If the luminance degradation curve differs depending on the type of
In this case, the luminance degradation ratio of each element (XR%, XG%, XB%)
Is calculated. From the values obtained here, for example, as shown in FIG.
The other XR% and XB% values to the lowest XG%
To determine the current correction coefficient for
The correction coefficient is stored in the storage means 13 and the light emission control
The current value flowing from the stage 14 to the light emitting element group 12 can be controlled.
And the luminance degradation of the light emitting elements 11a to 11c
Adjust the changed chromaticity. Therefore, the light emitting element group 1 of the unit 10
Color when the chromaticity of the screen display due to 2 is uneven
At the timing of adjustment, such as when an instruction to adjust the degree is input.
Is the degree of deterioration of the light emitting elements 11a to 11c while watching the screen.
Automatically without the need to manually adjust
The chromaticity can be adjusted. As described above, according to the first embodiment of the present invention,
In other words, the chromaticity of the light emitting elements
Are changed, the light emitting elements 11a to 11c
Brightness degradation curve and operating time
The ratios XR%, XG%, and XB% are determined, and each light emitting element 11
The current amount is set so that the luminance deterioration ratios of a to 11c become equal.
Can be adjusted, and the luminance of the light emitting elements 11a to 11c is poor.
Automatically adjusts the changed chromaticity of the light emitting element group 12
Can be adjusted. Therefore, measurement to measure deterioration
It is possible to display images etc. with a certain chromaticity without performing
It can be automatically adjusted as needed. (Second Embodiment) FIG. 8 shows a second embodiment of the present invention.
Showing a schematic overall configuration of the display device according to the second embodiment.
It is a lock figure. In addition, according to the second embodiment of the present invention.
Of the display device according to the first embodiment of the present invention.
The same processing as the constituent means in the display device according to the embodiment is performed.
The same reference numerals are given to the components to be performed, and the description thereof will be omitted. In FIG. 8, the display device is a unit 10
CPU 21 and operation time storage device
Step 22, setting storage means 23 and display signal control means 24
Power measurement means 25 so that signal information can be exchanged between
Light emitting element group 12 (light emitting elements 11a to 11a
The degree of the luminance degradation in 1c) differs depending on the power consumption.
Therefore, the brightness due to the operation time and power consumption as shown in FIG.
The deterioration curve is stored in the setting storage means 23, and the
Based on the information measured by the measuring means 25,
Calculate and store the average power consumption and calculate the average power consumption
And the operation time, the luminance deterioration ratio X% (XR%, XG%,
XB%) to obtain a more accurate chromaticity tone.
Adjustments can be made. As described above, in the second embodiment of the present invention,
Is not only the function and effect of the first embodiment of the present invention, but also
Average power consumption of optical element group 12 (light emitting elements 11a to 11c)
Luminance degradation ratio based on luminance degradation curve and operation time considering power
Rate, and the amount of current to the light emitting element group 12 is controlled.
Due to the luminance degradation of the light emitting elements 11a to 11c.
Automatically adjust the changed chromaticity of the light emitting element group 12 by
Can be. Therefore, adjust the chromaticity with higher accuracy.
Can be (Third Embodiment) FIG. 10 shows a third embodiment of the present invention.
9 shows a schematic overall configuration of a display device according to a third embodiment.
It is a block diagram. In FIG. 10, the display device is
Are connected to the control unit 20.
Each unit 10 is configured as a video display board.
Used for that unit 10 in each coefficient storage means 13
Light emitting element group 12 (light emitting elements 11a to 11c)
The current-brightness characteristics of the
Each unit receives the averaged power information and the brightness degradation curve
The average power consumption of the unit 1 was calculated, and the unit 1
A correction coefficient for each 0 is obtained and stored in each coefficient storage unit 13.
By storing, the light emission control means 1
4 to control the amount of current flowing from the light-emitting element group 12
Adjustments are made. As described above, in the third embodiment of the present invention,
Represents a light emitting element group 12 (light emission) used in each unit 10.
The characteristics of the elements 11a to 11c) are different from those of the first embodiment of the present invention.
As shown in FIG.
First, each unit 10 has the same brightness and chromaticity.
Power consumption differs for each unit 10
There is a difference in luminance degradation, and luminance / color
Although the degree of variation appears, the degree of deterioration of each unit 10
The amount of current to the light emitting element group 12 is controlled in consideration of
By this, the chromaticity variation of each unit 10 is automatically
Can be adjusted. Therefore, multiple units
Chromaticity can be improved even with a video display panel
Can be adjusted at different degrees to achieve uniform image quality without color unevenness.
An image or the like can be displayed. Another embodiment of the third embodiment of the present invention.
As shown in FIG. 11, the brightness of each unit 10 is
Value X of degree of deterioration ratio X% (XR%, XG%, XB%)
Min.% and the luminance deterioration ratio of other units 10
The coefficient storage means 1 of each unit 10
3 to the light emitting element group 12 from the light emission control means 14
Uses a configuration that controls the amount of current flowing and adjusts the brightness
By doing so, the variation in the brightness of each unit 10 can be reduced.
It can be adjusted with high precision. (Fourth Embodiment) Next, FIG.
Control of the display device according to the fourth embodiment of the present invention
FIG. In FIG. 12, the display device is a control unit 2
0, a luminance value table and a color temperature table in the setting storage means 23.
Table, and the display signal control means 24
The luminance value table and the color temperature table stored in the storage means 23 are stored.
After calculating the video signal S using the
The signal S is transmitted to the
Use the value table to change the screen brightness to the color temperature table
Therefore, the image can be adjusted by adjusting the balance of the brightness of each color.
The chromaticity of the surface can be adjusted. That is, in the fourth embodiment of the present invention,
As in the first to third embodiments of the present invention.
The correction coefficient stored in the coefficient storage means 13 of the unit 10 is written.
Separately from the replacement method, the setting storage means of the control unit 20
23, a luminance value table and a color temperature table
Adjust brightness and chromaticity by rewriting
You can do it. As described above, in the fourth embodiment of the present invention,
Also, the chromaticity changes due to the luminance deterioration of the light emitting element group 12.
Also, the luminance ratio of each of the light emitting elements 11a to 11c
Can be adjusted to adjust the chromaticity.
Automatically adjusts the chromaticity changed by 11c luminance degradation
can do. Therefore, measurement to actually measure deterioration
It is possible to display images etc. with a certain chromaticity without performing
It can be automatically adjusted as needed. (Fifth Embodiment) Next, FIG.
Luminance etc. in Display Device According to Fifth Embodiment of Invention
FIG. 4 is an explanatory diagram of the control of FIG. In FIG. 14, the video display board
Is an ambient temperature measuring means for measuring the ambient temperature of the image display board
26 is provided, and the ambient temperature measuring means 26 is provided with a unit.
Exchange of measurement information with the control unit 20 connected to the unit 10
Are connected as possible. Light emitting element group 12 (light emitting
The luminance of the elements 11a to 11c) changes depending on the temperature.
Therefore, the temperature versus luminance characteristics as shown in FIG.
Stored in the stage 23, and
The luminance change rate X% was calculated based on the measurement information and calculated.
A correction coefficient is obtained based on the luminance change rate X%, and the correction coefficient is calculated.
Controlling the amount of current of the light emitting element group 12 based on the number
It is possible to adjust the brightness changed by the ambient temperature.
I am able to do it. Further, as shown in FIG.
When the temperature versus luminance characteristics of the three types of light emitting elements are different
In this case, the luminance degradation ratio of each element (XR%, XG%, XB%)
Is calculated. The display signal control means 24 determines the brightness obtained here.
XR%, XG%, X
The current correction coefficient for obtaining the B%
The correction coefficient is stored in the coefficient storage means 13 of the
Flows from the light emission control means 14 to the light emitting element group 12 using
The light emitting elements 11a to 11c can be controlled by controlling the current value.
The chromaticity changed by the difference in the temperature characteristics is adjusted. As described above, in the fifth embodiment of the present invention,
Changes in brightness and chromaticity due to changes in the ambient temperature.
Even the temperature information and the temperature vs. brightness of each of the three types of light emitting elements
Equal luminance change ratio based on degree characteristics
The correction coefficient can be adjusted as the ambient temperature changes
Chromaticity change can be adjusted. Accordingly
Does not measure luminance or chromaticity even if the temperature environment changes.
Display device that can display video of constant image quality
Can be provided. (Sixth Embodiment) Next, FIG.
Luminance and the like in the display device according to the sixth embodiment of the invention
FIG. 4 is an explanatory diagram of the control of FIG. In FIG. 17, the display device is
Control unit 20 and a plurality of units connected to control unit 20
10 is configured to include the image display boards arranged side by side
Have been. Here, each unit 10 includes a light emitting element group.
Temperature measuring means 15 for measuring the ambient temperature of
ing. The display signal control means 24 controls the circumference of each unit 10.
The measurement information of the ambient temperature is taken in, and the temperature of each unit 10 is
Calculates the luminance change ratio according to the calculated luminance change ratio.
The correction coefficient for each unit 10 according to
The coefficient is stored in the coefficient storage unit 13. Soshi
Based on the correction coefficient stored in the coefficient storage means 13
The light emitting control means 14 determines the light emitting element
The chromaticity is adjusted by controlling the amount of current flowing through the group 12.
Swelling. Also, as in the fifth embodiment of the present invention,
Depending on the type of color emitted by the light emitting elements 11a to 11c.
When the temperature-luminance characteristics are different, the luminance of the light-emitting element of each color is poor.
Correction ratio according to the calculated luminance degradation ratio.
The number is obtained and stored in the coefficient storage means 13 and the coefficient
Based on the correction coefficient stored in the storage unit 13,
And the light emission control unit 14 emits light
The chromaticity is adjusted by controlling the amount of current flowing through the element group 12.
It may be good. As described above, in the sixth embodiment of the present invention,
Indicates that a difference in brightness occurs due to a temperature difference from the assumed temperature.
The brightness or chromaticity even if there is a difference in brightness or chromaticity.
Adjust the brightness and chromaticity for each unit without setting
Can be kept constant. (Seventh Embodiment) Next, FIG.
FIG. 19 shows a display device according to the seventh embodiment of the present invention.
FIG. According to a seventh embodiment of the present invention.
Storage means 23 of the control unit 20 constituting the display device
Now stores the setting coefficient for setting the color temperature.
ing. Specifically, the settings used to set the color temperature
For example, as shown in FIG.
May be stored for each color temperature. Also figure
As shown in FIG. 19, the setting coefficient is set for each luminance and each color temperature.
You may memorize it. FIG. 19 shows each of 16 levels of luminance.
An example of storing a set coefficient for each color temperature
FIG. The display signal control means 24 controls the designated brightness.
Predetermined information about the color temperature corresponding to the value;
On the basis of the setting coefficient stored in the setting storage
Control the chromaticity of each light-emitting element for each specified luminance.
It operates so that the color temperature according to the degree is realized. As described above, in the seventh embodiment of the present invention,
Can adjust the color temperature at each luminance level.
Constant chromaticity without being affected by temperature differences due to differences in brightness
To provide a display device capable of displaying images, etc.
Can be. Therefore, changing the brightness setting value
Therefore, even if the temperature of the image display panel changes,
By setting a color temperature setting coefficient, this temperature change
Display images etc. at a constant color temperature without being affected by
be able to. As described above, according to the present invention,
Even if the chromaticity changes due to the luminance deterioration of the light emitting element,
Luminance deterioration ratio of each from the operation time of multiple light emitting elements
And adjust them so that the luminance degradation ratio of each element is equal.
The brightness of the light emitting element
The changed chromaticity can be automatically adjusted. But
Therefore, even if the degree of deterioration of the light emitting element is not measured
Excellent image quality can be displayed in the image quality
A display device having an effect can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a schematic overall configuration of a display device according to a first embodiment of the present invention. FIG. 2 shows a display device according to a first embodiment of the present invention. FIG. 3 is a plan view schematically showing a configuration of a light emitting element group to be constituted. FIG. 3 is a graph showing one characteristic of the light emitting element of the present invention. FIG. 4 is a graph showing one characteristic of the light emitting element of the present invention. FIG. 6 is an explanatory diagram of control in the display device according to the first embodiment of the present invention. FIG. 6 is a graph showing one characteristic of the light emitting element of the present invention. FIG. 7 is control in the display device according to the first embodiment of the present invention. FIG. 8 is a block diagram showing a schematic overall configuration of a display device according to a second embodiment of the present invention. FIG. 9 is a graph showing one characteristic of a light emitting element of the present invention. FIG. 11 is a block diagram showing a schematic overall configuration of a display device according to a third embodiment. FIG. 12 is an explanatory diagram of control in a display device according to a third embodiment of the present invention. FIG. 12 is an explanatory diagram of control in a display device according to a fourth embodiment of the present invention. 14 is a block diagram showing a schematic overall configuration of a display device according to a fifth embodiment of the present invention. FIG. 15 is a graph showing one characteristic of a light emitting device of the present invention. FIG. 16 is one characteristic of a light emitting device of the present invention. FIG. 17 is a block diagram showing a schematic overall configuration of a display device according to a sixth embodiment of the present invention. FIG. 18 holds a color temperature setting coefficient according to a seventh embodiment of the present invention. FIG. 19 is a diagram showing an example of holding a color temperature setting coefficient for each luminance according to the seventh embodiment of the present invention. DESCRIPTION OF SYMBOLS 10 Units 11 a to 11 c Light emitting element 12 Light emitting element Group 13 coefficient storage means 14 light emission control means 2 Control unit 21 CPU 22 operating time storage unit 23 setting storage unit 24 display signal control means 25 power measuring means 26 ambient temperature measuring means 101 CRT 102 detector 103 table selecting unit 104 storage unit 105 gradation correcting means S video signal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 642 G09G 3/20 642B 642C 642L 642P 650 650M 670 670J 680 680E (72) Inventor Hiroto Yaegashi Kanagawa Matsushita Communication Industrial Co., Ltd. (7-1), Matsushita Communication Industrial Co., Ltd. (3-1) Matsushita Communication Industrial Co., Ltd. (7-1) Tsunashima Higashi 4-3-1, Kohoku-ku, Yokohama-shi Matsushita Communication Industrial Co., Ltd. (72) Person Norihiko Okazaki 4-3-1 Tsunashimahigashi, Kohoku-ku, Yokohama-shi, Kanagawa F-term within Matsushita Communication Industrial Co., Ltd. (reference) 5C080 AA07 BB06 CC03 DD04 DD05 DD14 DD20 DD29 EE29 EE30 FF09 GG02 GG15 GG17 HH14 JJ02 JJ03 JJ05

Claims (1)

1. A light emitting element group comprising an array of a plurality of light emitting elements, coefficient storage means for storing coefficients for adjusting an image displayed by the light emitting element group, and the light emitting element Light emission control means for causing the light emitting element group to emit light based on display data for displaying an image in a group and a coefficient stored in the coefficient storage means, and an operation time storage for storing an operation time since the start of operation Means, setting storage means for storing a set value for controlling light emission of the light emitting element group, and a display for controlling light emission of the light emitting element based on the set value stored in the setting storage means and the display data. A display device, comprising: signal control means; wherein the light emission control means controls light emission of the plurality of light emitting elements using the operation time stored in the operation time storage means. 2. The light emission control means calculates a luminance deterioration ratio for each light emitting element using the operation time storage means,
The display device according to claim 1, wherein light emission of the plurality of light emitting elements is controlled by a correction coefficient that makes a luminance deterioration ratio of the plurality of light emitting elements equal. 3. An image display panel comprising a plurality of units in which the light emitting element groups are arranged in rows and columns and the coefficient storage means for storing current-brightness characteristics of the light emitting elements is provided. The power consumption is calculated for each unit using the current-luminance characteristics of the light emitting element stored in the coefficient storage unit of each unit and the average power information obtained by the power measurement unit, and the calculation result is obtained. Using the operation time information obtained from the operation time storage means, the correction coefficient of each of the units is obtained and stored in the coefficient storage means, and the current value is controlled using the correction coefficient. The display device according to claim 2, wherein the chromaticity is adjusted. 4. The correction coefficient of each unit is determined so that the luminance deterioration ratio of all other units is matched with the lowest luminance deterioration ratio calculated for each unit. The display device according to claim 3, wherein the brightness is adjusted for each unit by storing in a storage unit and adjusting a current value using the correction coefficient. 5. A light emitting element group comprising an array of a plurality of light emitting elements, coefficient storage means for storing a coefficient for adjusting the amount of current flowing through the light emitting element group, and displaying an image or the like on the light emitting element group. Light emission control means for causing the light emitting element group to emit light based on display data for performing the operation and the coefficient stored in the coefficient storage means, and operation time storage means for recording an operation time from the start of operation to the adjustment timing Setting storage means for storing a set value for controlling light emission of the light emitting element group; and controlling light emission of the light emitting element group based on the set value and the display data stored in the setting storage means. A display signal control unit, and changing a setting value stored in the setting storage unit for adjusting chromaticity by changing a luminance ratio of each color of the light emitting element group, thereby changing the light emitting element. A display device for controlling a current value of the light emitting element to adjust luminance and chromaticity of the light emitting element. 6. A light emitting element group including an array of a plurality of light emitting elements, coefficient storage means for storing an amount of current flowing through the light emitting element group, and temperature measuring means for measuring an ambient temperature of the light emitting element group; A setting storage unit for storing a set value for controlling light emission of the light emitting element group and a temperature-luminance characteristic of the light emitting element; information of the ambient temperature obtained from the temperature measuring unit and stored in the setting storage unit; Calculating a rate of change in luminance of each of the light emitting elements based on the temperature vs. luminance characteristic, obtaining a correction coefficient corresponding to the calculated rate of change in luminance of each of the light emitting elements, and storing the correction coefficient in the coefficient storage means. And display signal control means for controlling light emission of the light emitting element group based on the set value and the display data stored in the setting storage means and the correction coefficient stored in the coefficient storage means. The display device, wherein the display signal control means adjusts a current value of the light emitting element based on the correction coefficient and controls luminance of the light emitting element according to the ambient temperature. 7. The light-emitting element includes a red light-emitting element, a green light-emitting element, and a blue light-emitting element, and the setting storage unit stores a temperature-luminance characteristic of each color light-emitting element. The display signal control means calculates a rate of change in luminance of the light emitting element of each color based on the information on the ambient temperature and each of the temperature versus luminance characteristics, and calculates a calculated change in luminance of the light emitting element of each color. A color-dependent correction coefficient corresponding to the rate is obtained and stored in the coefficient storage means, and the current value of each light-emitting element of each color is adjusted based on the color-dependent correction coefficient, and the color temperature of each light-emitting element is adjusted. The display device according to claim 6, wherein the display device is controlled. 8. An image display panel constructed by a plurality of units in which said light emitting element groups are arranged vertically and horizontally and said coefficient storage means is arranged, and an ambient temperature of said light emitting element groups for each of said units. With temperature measurement means to measure,
The change rate of the luminance of each of the light emitting elements is calculated based on the information on the ambient temperature and the temperature versus luminance characteristic, and a correction coefficient corresponding to the calculated change rate of the luminance of each light emitting element is calculated. 7. The display device according to claim 6, wherein the luminance value of the light emitting element is controlled for each of the units by storing and storing the current value of the light emitting element based on the correction coefficient. 9. An image display panel constructed by a plurality of units in which the light emitting element groups are arranged vertically and horizontally and the coefficient storage means is arranged, and an ambient temperature of the light emitting element groups for each unit. With temperature measurement means to measure,
The light-emitting element includes a red light-emitting element, a green light-emitting element, and a blue light-emitting element, the setting storage unit stores a temperature-luminance characteristic of each color light-emitting element, and the display signal control unit Calculating, for each of the units, a rate of change of the luminance of the light emitting element of each color based on the information on the ambient temperature and each of the temperature versus luminance characteristics, and calculating the change in luminance of the light emitting element of each color calculated. A color-dependent correction coefficient corresponding to the rate is obtained and stored in the coefficient storage unit of the corresponding unit, and the current value of each light-emitting element of each color is adjusted based on the color-dependent correction coefficient of each unit. The display device according to claim 7, wherein a color temperature of the light emitting element is controlled. 10. The setting storage unit further stores a setting coefficient for setting a color temperature for each luminance setting value, and the display signal control unit determines a color temperature corresponding to a designated luminance value in advance. The display device according to any one of claims 1 to 9, wherein the chromaticity of each of the light-emitting elements is controlled for each designated luminance based on the received information.
JP2002307386A 2001-10-31 2002-10-22 Display device Pending JP2003202838A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2001-334197 2001-10-31
JP2001334197 2001-10-31
JP2002307386A JP2003202838A (en) 2001-10-31 2002-10-22 Display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002307386A JP2003202838A (en) 2001-10-31 2002-10-22 Display device

Publications (1)

Publication Number Publication Date
JP2003202838A true JP2003202838A (en) 2003-07-18

Family

ID=27666711

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002307386A Pending JP2003202838A (en) 2001-10-31 2002-10-22 Display device

Country Status (1)

Country Link
JP (1) JP2003202838A (en)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005055722A (en) * 2003-08-06 2005-03-03 Nec Corp Display driving circuit and display device using the same
JP2005062859A (en) * 2003-07-31 2005-03-10 Semiconductor Energy Lab Co Ltd Display device, driving method of display device, and semiconductor integrated circuit incorporated in display device
JP2005077824A (en) * 2003-09-01 2005-03-24 Sony Corp Display device
JP2005182056A (en) * 2003-12-23 2005-07-07 Barco Nv Method of controlling tiled large-screen emissive display, computer program product, machine-readable data storage device, and transmission and control unit for computer program product
WO2006011666A1 (en) * 2004-07-30 2006-02-02 Semiconductor Energy Laboratory Co., Ltd. Display device, driving method thereof and electronic appliance
JP2006065319A (en) * 2004-07-30 2006-03-09 Semiconductor Energy Lab Co Ltd Display device, active matrix type display device, passive matrix type display device and electronic appliance, and driving method of display device
WO2006100977A1 (en) * 2005-03-23 2006-09-28 Mitsubishi Denki Kabushiki Kaisha Display device
JP2007025217A (en) * 2005-07-15 2007-02-01 Futaba Corp Display using electric field emission display element, luminance control device and method of electric field emission display element
JP2007101702A (en) * 2005-09-30 2007-04-19 Nagoya Electric Works Co Ltd Method and apparatus for displaying information
JP2007140325A (en) * 2005-11-22 2007-06-07 Seiko Epson Corp Light emission controller, display device, electronic apparatus, and method of controlling light emitting device
US7285763B2 (en) 2004-10-29 2007-10-23 Semiconductor Energy Laboratory Co., Ltd. Video data correction circuit, display device and electronic appliance
CN100421140C (en) 2003-11-28 2008-09-24 精工爱普生株式会社 Display apparatus and method of driving the same
WO2008143130A1 (en) * 2007-05-18 2008-11-27 Sony Corporation Display device, display device drive method, and computer program
JP2009025735A (en) * 2007-07-23 2009-02-05 Hitachi Displays Ltd Image display device
US7545349B2 (en) 2005-03-08 2009-06-09 Seiko Epson Corporation Display device and display module of movable body
JP2011112887A (en) * 2009-11-27 2011-06-09 Yazaki Corp Display device for vehicle
US7961160B2 (en) 2003-07-31 2011-06-14 Semiconductor Energy Laboratory Co., Ltd. Display device, a driving method of a display device, and a semiconductor integrated circuit incorporated in a display device
RU2469416C2 (en) * 2007-06-08 2012-12-10 Сони Корпорейшн Display device, display device control method and computer program
JP2013225035A (en) * 2012-04-23 2013-10-31 Mitsubishi Electric Corp Image display device and control method therefor
JP2013238793A (en) * 2012-05-17 2013-11-28 Mitsubishi Electric Corp Video display device
JP2014071184A (en) * 2012-09-28 2014-04-21 Mitsubishi Electric Corp Image display device
JP2014102484A (en) * 2012-11-21 2014-06-05 Lighthouse Technologies Ltd Automatic color adjustment on led video screen
US9019319B2 (en) 2009-11-27 2015-04-28 Yazaki Corporation Display device for vehicle
WO2017061195A1 (en) * 2015-10-05 2017-04-13 三菱電機株式会社 Light-emitting diode display device
JP2017102453A (en) * 2015-11-30 2017-06-08 ビステオン グローバル テクノロジーズ インコーポレイテッド System and method for restraining luminance degradation by using consumption rate limit

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005062859A (en) * 2003-07-31 2005-03-10 Semiconductor Energy Lab Co Ltd Display device, driving method of display device, and semiconductor integrated circuit incorporated in display device
US7961160B2 (en) 2003-07-31 2011-06-14 Semiconductor Energy Laboratory Co., Ltd. Display device, a driving method of a display device, and a semiconductor integrated circuit incorporated in a display device
JP2005055722A (en) * 2003-08-06 2005-03-03 Nec Corp Display driving circuit and display device using the same
JP2005077824A (en) * 2003-09-01 2005-03-24 Sony Corp Display device
JP4496736B2 (en) * 2003-09-01 2010-07-07 ソニー株式会社 Display device
CN100421140C (en) 2003-11-28 2008-09-24 精工爱普生株式会社 Display apparatus and method of driving the same
CN101354865B (en) 2003-11-28 2012-04-04 精工爱普生株式会社 Display apparatus and method of driving the same
JP2005182056A (en) * 2003-12-23 2005-07-07 Barco Nv Method of controlling tiled large-screen emissive display, computer program product, machine-readable data storage device, and transmission and control unit for computer program product
US8154541B2 (en) 2004-07-30 2012-04-10 Semiconductor Energy Laboratory Co., Ltd. Display device, driving method thereof and electronic appliance
WO2006011666A1 (en) * 2004-07-30 2006-02-02 Semiconductor Energy Laboratory Co., Ltd. Display device, driving method thereof and electronic appliance
JP2006065319A (en) * 2004-07-30 2006-03-09 Semiconductor Energy Lab Co Ltd Display device, active matrix type display device, passive matrix type display device and electronic appliance, and driving method of display device
US7285763B2 (en) 2004-10-29 2007-10-23 Semiconductor Energy Laboratory Co., Ltd. Video data correction circuit, display device and electronic appliance
US7652239B2 (en) 2004-10-29 2010-01-26 Semiconductor Energy Laboratory Co., Ltd. Video data correction circuit, display device and electronic appliance
US7545349B2 (en) 2005-03-08 2009-06-09 Seiko Epson Corporation Display device and display module of movable body
WO2006100977A1 (en) * 2005-03-23 2006-09-28 Mitsubishi Denki Kabushiki Kaisha Display device
JP2007025217A (en) * 2005-07-15 2007-02-01 Futaba Corp Display using electric field emission display element, luminance control device and method of electric field emission display element
JP4600190B2 (en) * 2005-07-15 2010-12-15 双葉電子工業株式会社 Display device using field emission display element, brightness adjusting device for field emission display element, and brightness adjusting method thereof
JP2007101702A (en) * 2005-09-30 2007-04-19 Nagoya Electric Works Co Ltd Method and apparatus for displaying information
JP2007140325A (en) * 2005-11-22 2007-06-07 Seiko Epson Corp Light emission controller, display device, electronic apparatus, and method of controlling light emitting device
RU2469415C2 (en) * 2007-05-18 2012-12-10 Сони Корпорейшн Display device, display device control method and computer program
AU2008254175B2 (en) * 2007-05-18 2013-05-02 Sony Corporation Display device, display device drive method, and computer program
WO2008143130A1 (en) * 2007-05-18 2008-11-27 Sony Corporation Display device, display device drive method, and computer program
JPWO2008143130A1 (en) * 2007-05-18 2010-08-05 ソニー株式会社 Display device, display device driving method, and computer program
RU2469416C2 (en) * 2007-06-08 2012-12-10 Сони Корпорейшн Display device, display device control method and computer program
TWI409753B (en) * 2007-06-08 2013-09-21 Sony Corp A display device, a driving method of a display device, and a computer program product
JP2009025735A (en) * 2007-07-23 2009-02-05 Hitachi Displays Ltd Image display device
JP2011112887A (en) * 2009-11-27 2011-06-09 Yazaki Corp Display device for vehicle
US9019319B2 (en) 2009-11-27 2015-04-28 Yazaki Corporation Display device for vehicle
JP2013225035A (en) * 2012-04-23 2013-10-31 Mitsubishi Electric Corp Image display device and control method therefor
JP2013238793A (en) * 2012-05-17 2013-11-28 Mitsubishi Electric Corp Video display device
JP2014071184A (en) * 2012-09-28 2014-04-21 Mitsubishi Electric Corp Image display device
JP2014102484A (en) * 2012-11-21 2014-06-05 Lighthouse Technologies Ltd Automatic color adjustment on led video screen
WO2017061195A1 (en) * 2015-10-05 2017-04-13 三菱電機株式会社 Light-emitting diode display device
JPWO2017061195A1 (en) * 2015-10-05 2018-01-11 三菱電機株式会社 Light emitting diode display device
JP2017102453A (en) * 2015-11-30 2017-06-08 ビステオン グローバル テクノロジーズ インコーポレイテッド System and method for restraining luminance degradation by using consumption rate limit

Similar Documents

Publication Publication Date Title
CN100385490C (en) White illumination
US7224332B2 (en) Method of aging compensation in an OLED display
Berns Methods for characterizing CRT displays
EP0961260B1 (en) Calibration method and apparatus for display devices.
US5754222A (en) Visual characterization using display model
US9111485B2 (en) Compensation technique for color shift in displays
CN100392367C (en) System for measuring chromaticity coordinates
US7940310B2 (en) Method and apparatus for automatic white balance
TWI393113B (en) Methods of converting a three-or-more component image input signal to an image output signal and displaying the image input signal on a display device, and four-color display
US7495679B2 (en) Method and system for automatically calibrating a color display
US8890795B2 (en) Field sequential display of color images with color selection
US7330190B2 (en) Correction characteristic determining device, correction characteristic determining method, and display device
JP4834896B2 (en) Image processing apparatus and method, image transmission / reception system and method, and recording medium
TWI398837B (en) A display having backlight modulation, a method for configuring the display and a convertor for converting an input signal for the display
US8674926B2 (en) Image display device and image display method using black display
US20060077135A1 (en) Method for compensating an OLED device for aging
US8054252B2 (en) Light-emitting display device, electronic apparatus, burn-in correction device, and program
US7557518B2 (en) Solid-state, color-balanced backlight with wide illumination range
JP2009008916A (en) Image display device
EP0883103B1 (en) Direct view liquid crystal display with automatic colour adjustment
CN1183777C (en) White dot regulating method and white dot regulating device
US7134091B2 (en) Quality of displayed images with user preference information
JP2004228948A (en) Image processing system, projector, program, information storage medium and image processing method
JPWO2005050614A1 (en) Brightness adjustment method, liquid crystal display device, and computer program
US5512961A (en) Method and system of achieving accurate white point setting of a CRT display