WO2013046392A1 - 劣化検出回路、表示装置、及び性能劣化検出方法 - Google Patents
劣化検出回路、表示装置、及び性能劣化検出方法 Download PDFInfo
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- WO2013046392A1 WO2013046392A1 PCT/JP2011/072368 JP2011072368W WO2013046392A1 WO 2013046392 A1 WO2013046392 A1 WO 2013046392A1 JP 2011072368 W JP2011072368 W JP 2011072368W WO 2013046392 A1 WO2013046392 A1 WO 2013046392A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0693—Calibration of display systems
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2380/00—Specific applications
- G09G2380/08—Biomedical applications
Definitions
- the present invention relates to a deterioration detection circuit, a display device, and a performance deterioration detection method.
- FIG. 4 is a diagram showing a configuration of a conventional display device.
- the display device includes a display unit using a display panel such as an LCD (Liquid Crystal Display) or a projector (PJ).
- the warning screen drawing circuit displays a video signal input from a personal computer or a video as it is on the display unit.
- the timer circuit detects the operating time of the display device or the number of days elapsed since the last calibration, and outputs a warning output instruction to the warning screen drawing circuit when the operating time or the number of elapsed days exceeds the reference value.
- the warning screen drawing circuit determines that the display characteristics have deteriorated, and displays a warning screen on the display unit. In this way, the display device recommends calibration to the user by displaying the warning screen.
- Patent Document 1 discloses a liquid crystal display device that displays a message indicating that a user needs to replace a lamp when a deterioration in luminance of a backlight (hereinafter referred to as “BL”) is detected.
- BL a deterioration in luminance of a backlight
- Patent Document 2 describes an LCD display device that instructs a user to replace a BL lamp based on a comparison between a BL drive value at the start of use and a BL drive value after a predetermined time has elapsed. .
- JP 2009-93098 A Japanese Patent No. 3559161
- a timer reference value is set in the timer circuit of the conventional display device as shown in FIG. For this reason, in normal use where the room temperature and the luminance are low, it takes a longer time than the timer reference value until the display characteristics are degraded to the extent that calibration is necessary. That is, there is room for reducing the calibration frequency during normal use. Moreover, since calibration is complicated, there is a demand from the user to reduce the execution frequency as much as possible.
- the display device can determine that calibration is necessary when the deterioration detection value becomes a constant value as in the conventional timer method.
- luminance stabilization and temperature drift correction are performed, and performance is maintained even if temperature and luminance change.
- luminance stabilization and temperature drift correction are performed, there is a problem that it is difficult to detect display characteristic deterioration necessary for reducing the calibration frequency.
- the detected luminance is set as the deterioration value, but the luminance does not change during luminance stabilization.
- the luminance stabilization when luminance stabilization is not performed, the luminance varies greatly depending on the room temperature, the warm-up state of the display device, and user settings. That is, the luminance value is not suitable as a deterioration index.
- the BL drive value used for detection of display characteristic deterioration in Patent Document 2 changes due to aging deterioration even in the luminance stabilization state, the detection value is greatly influenced by the room temperature and the luminance set by the user. That is, the BL drive value is not suitable as a deterioration index.
- the present invention has been made in consideration of such circumstances, and includes a deterioration detection circuit, a display device, and a performance deterioration detection method capable of detecting deterioration of display characteristics that need to be calibrated regardless of use conditions. provide.
- the present invention is a deterioration detection circuit for a display device having a display panel, a light source that illuminates the display panel, and a control unit that controls the amount of light emitted from the light source.
- a light emission amount detection unit that detects a light emission amount
- a drive value detection unit that detects a drive value used by the control unit to control the light emission amount of the light source
- a temperature detection unit that detects an internal temperature or an outside air temperature of the display device Corresponding to the temperature detected by the temperature detection unit and the drive value detected by the drive value detection unit based on the relationship between the reference light emission amount and temperature of the light source obtained in advance and the drive value.
- a reference light emission amount obtaining unit for obtaining a reference light emission amount, the reference light emission amount obtained by the reference light emission amount obtaining unit based on the temperature and the driving value in an initial state, and the initial state detected by the light emission amount detection unit Luminescence at The initial state value is obtained from the ratio of the reference light amount, and further, the reference light emission amount obtained by the reference light emission amount obtaining unit based on the current temperature and the drive value, and the current detected by the light emission amount detection unit Deterioration detection instructing to display deterioration of the display device or the light source when a current state value is obtained from a ratio with a light emission amount and the initial state value is compared with the current state value and it is determined that calibration is necessary.
- a deterioration detection circuit comprising:
- the present invention also provides a display panel, a light source that illuminates the display panel, a control unit that controls the light emission amount of the light source, and a light emission amount detection unit that detects the light emission amount of the light source or the display panel.
- a drive value detection unit that detects a drive value used by the control unit to control the light emission amount of the light source, a temperature detection unit that detects an internal temperature or an outside temperature of the display device, and a light source that has been obtained in advance. Based on the relationship between the reference light emission amount and the temperature and the drive value, the reference light emission amount is obtained for obtaining the reference light emission amount corresponding to the temperature detected by the temperature detection unit and the drive value detected by the drive value detection unit.
- the initial state from the ratio of the reference light emission amount obtained by the reference light emission amount acquisition unit based on the temperature and the drive value in the initial state and the light emission amount in the initial state detected by the light emission amount detection unit Seeking the value Further, a current state value is obtained from a ratio between the reference light emission amount obtained by the reference light emission amount acquisition unit based on the current temperature and the drive value and the current light emission amount detected by the light emission amount detection unit.
- a deterioration detection unit that instructs to display deterioration of the display device or the light source when it is determined that calibration is necessary by comparing the initial state value with the current state value. Device.
- the present invention also relates to a method for detecting performance deterioration of a display device, comprising: a display panel; a light source that illuminates the display panel; and a control unit that controls the amount of light emitted from the light source.
- the temperature detected in the temperature detection process and the drive detected in the drive value detection process based on the temperature detection process and the relationship between the reference light emission amount and temperature of the light source obtained in advance and the temperature and the drive value A reference light emission amount obtaining process for obtaining a reference light emission amount corresponding to the value, and the reference light emission amount obtained in the reference light emission amount obtaining process based on the temperature and the drive value in an initial state; An initial state value is obtained from a ratio with the light emission amount in the initial state detected in the light emission amount detection process, and further obtained in the reference light emission amount acquisition process based on the current temperature and the driving value.
- a current state value is obtained from a ratio between the reference light emission amount and the current light emission amount detected in the light emission amount detection process, and the initial state value and the current state value are compared with each other and it is determined that calibration is necessary. And a degradation detection process for instructing to display degradation of the display device or the light source.
- the present invention it is possible to detect deterioration of display characteristics that need to be calibrated regardless of the usage state of the display device.
- FIG. 1 is a block diagram showing a configuration of a display device 1 according to an embodiment of the present invention.
- the display device 1 includes a target luminance setting unit 11, a drive circuit 12, a backlight 13 (hereinafter, “backlight” is described as “BL”), a deterioration detection circuit 14, and a warning screen drawing.
- a circuit 15 and a display unit 16 are provided.
- the display unit 16 is a display panel such as an LCD (Liquid Crystal Display) or a micromirror device.
- BL13 is a light source that illuminates the display panel.
- the target brightness setting unit 11 sets the target brightness of the BL 13 input by a switch or the like provided in the display device 1 in the drive circuit 12.
- the drive circuit 12 drives the BL 13 with a BL drive value corresponding to the target brightness set by the target brightness setting unit 11.
- the BL drive value is a control value that changes the BL brightness, such as voltage, current, and PWM (Pulse Width Modulation) duty during BL control.
- the deterioration detection circuit 14 includes a drive value detection unit 21, a temperature detection unit 22, a reference light emission amount acquisition unit 23, a light emission amount detection unit 25, and a deterioration detection unit 26.
- the drive value detector 21 detects the BL drive value that the drive circuit 12 uses to drive the BL 13.
- the temperature detection unit 22 detects the device internal temperature or the outside air temperature of the display device 1.
- the reference light emission amount acquisition unit 23 includes a reference light emission amount storage unit 24 that stores data indicating the relationship between the BL drive value and temperature and the reference light emission amount.
- reference luminance is used as the reference light emission amount.
- the reference luminance is a reference luminance for determining the luminance degradation state.
- the reference light emission amount acquisition unit 23 corresponds to the combination of the BL drive value detected by the drive value detection unit 21 and the temperature detected by the temperature detection unit 22 based on the data stored in the reference light emission amount storage unit 24. Find the reference brightness.
- the light emission amount detection unit 25 detects or estimates the luminance as the light emission amount of BL13. In addition, the light emission amount detection unit 25 performs luminance stabilization control that instructs the drive circuit 12 to provide a new BL drive value so that the luminance is constant based on the current luminance.
- the deterioration detection unit 26 compares the reference luminance calculated by the reference light emission amount acquisition unit 23 with the luminance detected by the light emission amount detection unit 25 to calculate a state value representing the state of the display characteristics. When the deterioration detection unit 26 detects a deterioration state that requires calibration by comparing the state value in the initial state with the current state value, the deterioration detection unit 26 notifies the warning screen drawing circuit 15 of the performance deterioration.
- the deterioration detection unit 26 includes an initial state value storage unit 27 that stores an initial value of the deterioration state.
- the warning screen drawing circuit 15 causes the display unit 16 to display the screen of the video signal input from a personal computer or a video as it is when performance degradation is not notified from the degradation detection unit 26.
- the warning screen drawing circuit 15 displays a warning screen on the display unit 16 so as to overlap the screen of the video signal.
- the target luminance setting unit 11, the drive circuit 12, BL13, the warning screen drawing circuit 15, and the display unit 16 are realized by existing general techniques.
- the light emission amount detection unit 25 detects the brightness of the BL 12 on the side surface or the back surface of the display panel (display unit 16) in order to prevent the appearance from being lost such as part of the display screen being hidden. It is said. However, even if the screen luminance is detected by the light emission amount detection unit 25 installed on the display screen of the display panel (display unit 16), the same effect can be obtained.
- the luminance is used as the light emission amount. Instead of the luminance, the light emission amount is measured by the RGB (Red Green Blue) value of the color sensor or the illuminance sensor value. It can be appropriately selected according to the light emission amount detection means of the unit 25.
- the manufacturer of the display device 1 measures the luminance characteristics when the BL drive value and the temperature are changed using the display device 1 in advance. This is because BL13 has a characteristic that the luminance greatly changes depending on the BL driving value and temperature.
- FIG. 2 is a diagram showing luminance characteristics corresponding to changes in room temperature and BL drive value.
- the figure shows an example in which a PWM duty is used as the BL drive value.
- This figure shows the relationship between the BL drive value and the reference brightness, which is the brightness when the drive circuit 12 drives BL13 with this BL drive value, for each room temperature of 15 degrees Celsius, 25 degrees Celsius, and 35 degrees Celsius.
- FIG. 3 is a diagram showing a two-dimensional lookup table (hereinafter referred to as “2DLUT”) generated from the relationship between the temperature and BL driving value shown in FIG. 2 and the reference luminance.
- 2DLUT is data indicating a correspondence between a set of temperature (TEMP) and BL drive value (BL Level) and reference luminance (Lumi).
- the manufacturer of the display device 1 generates the 2DLUT shown in FIG. 3 from the luminance characteristics obtained as shown in FIG.
- the generated 2DLUT is stored in the reference light emission amount storage unit 24 of the display device 1.
- the initial characteristics of the display device 1 are stored immediately after calibration, such as during factory production.
- the time immediately after the calibration is described as the initial characteristic setting.
- the drive value detection unit 21 of the display device 1 reads out the BL drive value at the time of initial characteristic setting from the drive circuit 12 and outputs it to the reference light emission amount acquisition unit 23.
- the temperature detection unit 22 reads the temperature at the time of initial characteristic setting and outputs it to the reference light emission amount acquisition unit 23.
- the reference emission amount acquisition unit 23 reads the reference luminance from the 2DLUT (FIG. 3) stored in the reference emission amount storage unit 24 in advance using the received temperature and the BL drive value as search conditions.
- the reference light emission amount acquisition unit 23 outputs the read reference luminance to the deterioration detection unit 26.
- the deterioration detection unit 26 acquires the luminance at the time of initial characteristic setting of the BL 13 from the light emission amount detection unit 25.
- the deterioration detection unit 26 is a ratio between the reference luminance obtained from the 2DLUT by the reference light emission amount acquisition unit 23 using the temperature and driving value at the time of initial characteristic setting and the luminance at the time of initial characteristic setting received from the light emission amount detection unit 25. Is calculated.
- the deterioration detection unit 26 writes the calculated ratio in the initial state value storage unit 27 as an initial state value (InitStatus).
- the performance deterioration detection procedure assuming the case where the display device 1 is shipped and used by a user will be described.
- the performance deterioration detection procedure is executed periodically such as every predetermined time.
- the drive value detection unit 21 of the display device 1 reads the current BL drive value from the drive circuit 12 and outputs it to the reference light emission amount acquisition unit 23.
- the temperature detection unit 22 reads the current temperature and outputs it to the reference light emission amount acquisition unit 23.
- the reference emission amount acquisition unit 23 reads the reference luminance from the 2DLUT (FIG. 3) stored in the reference emission amount storage unit 24 in advance using the received temperature and the BL drive value as search conditions.
- the reference light emission amount acquisition unit 23 outputs the read reference luminance to the deterioration detection unit 26.
- the deterioration detection unit 26 obtains the current brightness of the BL 13 in the light emission amount detection unit 25.
- the deterioration detection unit 26 is a current state value that is a ratio between the reference luminance obtained from the 2DLUT by the reference light emission amount acquisition unit 23 using the current temperature and the BL drive value and the current luminance received from the light emission amount detection unit 25. Calculate (CurrentStatus).
- the deterioration detection unit 26 divides the calculated current state value by the initial state value read from the initial state value storage unit 27, and calculates a performance maintenance ratio (PerformanceRatio) as shown in Expression (1). .
- Performance maintenance rate Current state value / Initial state value ... (1)
- This performance maintenance rate is 100% immediately after calibration, and is a deterioration detection value that serves as an index that decreases as the deterioration of the display device 1 progresses.
- the deterioration detection unit 26 determines that calibration is necessary and outputs a warning output instruction to the warning screen drawing circuit 15.
- the warning screen drawing circuit 15 notifies the display unit 16 of the performance deterioration of the display characteristics and displays a warning screen warning that the calibration is necessary.
- the display device 1 displays a warning screen on the display unit 16 and prompts the user to calibrate the display device 1. For example, when the allowable limit is 90%, a warning screen is displayed after approximately 1000 to 2000 hours of use after calibration.
- the performance maintenance ratio of the display device 1 is detected by paying attention to the change in the luminous efficiency of the BL 13.
- the display device 1 can prompt calibration only when a certain performance deterioration is detected. Therefore, it is possible to reliably maintain the performance while reducing the calibration frequency as compared with the conventional display device that is assumed to be in a state where the performance deterioration is fast.
- the present embodiment is characterized in that the performance maintenance ratio can be detected even when the luminance stabilization control is performed, and the performance maintenance ratio is constant even if the display brightness at the time of measurement or measurement changes. is there. For example, immediately after calibration, the performance maintenance ratio becomes 100% regardless of the brightness setting, and the performance maintenance ratio can be detected correctly even at a brightness different from that at the time of calibration.
- the present embodiment is a display panel (display unit) such as a liquid crystal or a micromirror device, a light source (BL) that illuminates the display panel, and a control unit (drive circuit) that controls the light emission amount of the light source.
- the drive value detection unit detects a drive value (BL drive value) used by the control unit to control the light emission amount of the light source of the display device
- the temperature detection unit detects the internal temperature of the display device. Or the outside temperature is detected.
- the light emission amount detection unit detects or estimates the light emission amount (luminance) of the light source or the display panel.
- the reference emission amount acquisition unit obtains a reference emission amount (reference luminance) of the light source corresponding to the drive value detected by the drive value detection unit and the temperature detected by the temperature detection unit.
- the deterioration detection unit calculates an initial state value from a ratio between the reference light emission amount obtained by the reference light emission amount acquisition unit based on the temperature and drive value in the initial state and the light emission amount in the initial state detected by the light emission amount detection unit. And remember. Further, the deterioration detection unit calculates a current state value from a ratio between the reference light emission amount obtained by the reference light emission amount acquisition unit based on the current temperature and the drive value and the current light emission amount detected by the light emission amount detection unit. The stored initial state value is compared with the calculated current state value to determine whether calibration is necessary. Based on this determination, the warning screen display unit displays the deterioration of the display device or the light source on the display panel. As a result, the display device reports the performance deterioration of the display characteristics to the user.
- the reference light emission amount acquisition unit 23 uses the 2DLUT shown in FIG. 3 in order to obtain the reference brightness.
- the reference brightness may be calculated using a predetermined calculation formula.
- This calculation formula is a formula for calculating the reference luminance from the temperature and the BL drive value using a polynomial expansion approximated to the characteristics indicated by the 2DLUT.
- the reference luminance output from the reference light emission amount acquisition unit 23 may be absolute luminance, or may be a ratio or relative luminance with respect to some reference luminance.
- the 2DLUT is data indicating a correspondence between a set of temperature and BL drive value and relative luminance.
- the reference light emission amount acquisition unit 23 calculates the relative luminance from the temperature and the BL drive value using a polynomial expansion approximated to the characteristics indicated by the 2DLUT. It is desirable that the reference brightness be a drive level with little change in brightness even when the temperature changes. For example, in FIG. 2, a circled portion indicated by a dotted line has a small luminance change due to temperature. Therefore, the brightness of BL13 when the drive circuit 12 is driven with the BL drive value indicated by the circled portion is set as the reference brightness.
- the reference light emission amount acquisition unit 23 obtains the reference luminance corresponding to the detected temperature and the BL drive value, and the deterioration detection unit 26 detects the temperature and the BL drive value at the time of detection. It is compared with the brightness of the measured BL. However, if the reference luminance is fixed and the detected current luminance is corrected so as to correspond to the temperature and BL driving value at the reference luminance, the same effect can be obtained.
- the display device of this embodiment has the following features.
- Deterioration of display characteristics of the display device can be detected even under conditions where the luminance is constant because the luminance is stabilized.
- the deterioration state value changes depending on the deterioration state of the actual display characteristics of the display device. That is, even in the same usage time, the deterioration progresses quickly at high luminance or at high room temperature, and the deterioration state value changes greatly.
- the deterioration detection value (threshold of the deterioration state value) for determining that calibration is necessary is constant regardless of the room temperature and display luminance at the time of detection.
- the present invention can be applied to various display devices such as projectors and liquid crystal displays.
- any of an ultra-high pressure mercury lamp, a W / RGB LED (Light Emitting Diode), and a cold cathode tube (CCFL) can be selected.
- the light emission amount detection unit 25 may detect screen luminance, or may detect backlight luminance on the side or back of the screen.
- the light emission amount detected by the light emission amount detection unit 25 can be replaced by another scale indicating the light emission amount, such as the RGB value and the illuminance value of the color sensor, in addition to the luminance.
- the RGB values of the color sensor are suitable.
- the display device calibration frequency can be reduced when the display device is used in an environment where the performance degradation is slow while maintaining the same usability as the conventional timer method.
- the display device of this embodiment is suitable for use in a display device used in industries that require high-precision color reproduction, such as a display for graphic design use and a display for medical use.
- a display for graphic design use such as a display for graphic design use
- a display for medical use it is necessary to reliably detect the deterioration of display characteristics, but it is not allowed to recalibrate the display characteristics without confirmation from the administrator (automatically) for reasons such as quality control. It is effective when used in various situations.
- the deterioration detection circuit 14 shown in FIG. 1 is realized by dedicated hardware (for example, wired logic).
- a part of the deterioration detection circuit 14 is constituted by a memory and a CPU (central processing unit), and the function is realized by loading a program for realizing the function of each unit from the memory and executing it. Also good.
- the program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium.
- the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
- the program may be for realizing a part of the functions described above. Furthermore, what can implement
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Abstract
Description
また、校正は煩雑であるため、利用者からは、実行頻度を極力減らしたいという要望がある。
また、特許文献2が表示特性劣化検出に利用するBL駆動値は、輝度安定化状態でも経年劣化によって変化するものの、検出値は室温や利用者が設定した輝度に大きく影響される。すなわちBL駆動値は劣化指標として不適である。
また、本実施形態では、発光量として輝度を用いているが、輝度の代わりに、カラーセンサーのRGB(Red Green Blue)値や、照度センサー値を用いるなど、発光量の尺度は、発光量検出部25が有する発光量検出手段に応じて適宜選択できる。
表示装置1の製造者は、予め、表示装置1を用いてBL駆動値と温度とを変化させた際の輝度特性を測定しておく。これは、BL13はBL駆動値と温度に依存して輝度が大きく変化する特性があるためである。
まず、表示装置1の駆動値検出部21は、駆動回路12から初期特性設定時のBL駆動値を読み出して基準発光量取得部23に出力する。同時に、温度検出部22は、初期特性設定時の温度を読み取り、基準発光量取得部23に出力する。
なお、基準輝度は、温度変化時にも輝度変化が少ない駆動レベルとすることが望ましい。例えば、図2において、点線で記載した丸の部分は、温度による輝度変化が少ない。そこで、この丸の部分が示すBL駆動値により駆動回路12を駆動したときのBL13の輝度を基準輝度とする。
また、上述の実施形態では利用者に性能劣化を報告する形式としたが、逆に正常時に正常状態であることを報告する形式としてもよい。
(2)表示装置の実際の表示特性の劣化状態によって劣化状態値が変化する。つまり同じ使用時間でも、高輝度または高室温時には、劣化が早く進むため、劣化状態値が大きく変化する。
(3)検出時の室温や表示輝度に依存せず、校正が必要と判断するための劣化検出値(劣化状態値の閾値)が一定である。
(4)プロジェクタ、液晶ディスプレイなど多様な表示装置に適用できる。バックライトも超高圧水銀ランプ、W/RGB LED(Light Emitting Diode)、冷陰極管(CCFL)のいずれもが選択できる。発光量検出部25は、画面輝度を検出してもよいし、画面の横や背面でバックライト輝度を検出しても良い。発光量検出部25が検出する発光量は、輝度以外に、カラーセンサーのRGB値や照度値など、発光量を示す他の尺度でも代替できる。例えば、多色バックライトを持つ表示装置ではカラーセンサーのRGB値が適する。
特に、医療用途の表示装置などでは、表示特性劣化の確実な検出が必要であるが、品質管理などの理由で管理者の確認無く(自動的に)表示特性を再校正することが許されないような状況で使用されている場合に有効である。
11…目標輝度設定部
12…駆動回路
13…BL
14…劣化検出回路
15…警告画面描画回路
16…表示部
21…駆動値検出部
22…温度検出部
23…基準発光量取得部
24…基準発光量記憶部
25…発光量検出部
26…劣化検出部
27…初期状態値記憶部
Claims (4)
- 表示パネルと、前記表示パネルを照明する光源と、前記光源の発光量を制御する制御部とを有する表示装置の劣化検出回路であって、
前記光源または前記表示パネルの発光量を検出する発光量検出部と、
前記制御部が前記光源の発光量の制御に用いる駆動値を検出する駆動値検出部と、
前記表示装置の内部温度または外気温を検出する温度検出部と、
予め得られている光源の基準発光量及び温度と駆動値との関係に基づいて、前記温度検出部が検出した前記温度と、前記駆動値検出部が検出した前記駆動値とに対応した基準発光量を求める基準発光量取得部と、
初期状態における前記温度及び前記駆動値に基づいて前記基準発光量取得部が求めた前記基準発光量と、前記発光量検出部が検出した前記初期状態における発光量との比から初期状態値を求めておき、さらに、現在の前記温度及び前記駆動値に基づいて前記基準発光量取得部が求めた前記基準発光量と、前記発光量検出部が検出した現在の発光量との比から現在状態値を求め、前記初期状態値と前記現在状態値とを比較して校正が必要と判断した場合に前記表示装置または前記光源の劣化を表示するよう指示する劣化検出部と、
を備えることを特徴とする劣化検出回路。 - 前記劣化検出部は、前記初期状態値と前記現在状態値との比から性能維持率を算出し、算出した性能維持率が閾値を超えているか否かにより校正が必要かを判断する、
ことを特徴とする請求項1に記載の劣化検出回路。 - 表示パネルと、
前記表示パネルを照明する光源と、
前記光源の発光量を制御する制御部と、
前記光源または前記表示パネルの発光量を検出する発光量検出部と、
前記制御部が前記光源の発光量の制御に用いる駆動値を検出する駆動値検出部と、
前記表示装置の内部温度または外気温を検出する温度検出部と、
予め得られている光源の基準発光量及び温度と駆動値との関係に基づいて、前記温度検出部が検出した前記温度と、前記駆動値検出部が検出した前記駆動値とに対応した基準発光量を求める基準発光量取得部と、
初期状態における前記温度及び前記駆動値に基づいて前記基準発光量取得部が求めた前記基準発光量と、前記発光量検出部が検出した前記初期状態における発光量との比から初期状態値を求めておき、さらに、現在の前記温度及び前記駆動値に基づいて前記基準発光量取得部が求めた前記基準発光量と、前記発光量検出部が検出した現在の発光量との比から現在状態値を求め、前記初期状態値と前記現在状態値とを比較して校正が必要と判断した場合に前記表示装置または前記光源の劣化を表示するよう指示する劣化検出部と、
を備えることを特徴とする表示装置。 - 表示パネルと、前記表示パネルを照明する光源と、前記光源の発光量を制御する制御部とを有する表示装置の性能劣化検出方法であって、
前記光源または前記表示パネルの発光量を検出する発光量検出過程と、
前記制御部が前記光源の発光量の制御に用いる駆動値を検出する駆動値検出過程と、
前記表示装置の内部温度または外気温を検出する温度検出過程と、
予め得られている光源の基準発光量及び温度と駆動値との関係に基づいて、前記温度検出過程において検出された前記温度と、前記駆動値検出過程において検出された前記駆動値とに対応した基準発光量を求める基準発光量取得過程と、
初期状態における前記温度及び前記駆動値に基づいて前記基準発光量取得過程において求められた前記基準発光量と、前記発光量検出過程において検出された前記初期状態における発光量との比から初期状態値を求めておき、さらに、現在の前記温度及び前記駆動値に基づいて前記基準発光量取得過程において求められた前記基準発光量と、前記発光量検出過程において検出された現在の発光量との比から現在状態値を求め、前記初期状態値と現在状態値とを比較して校正が必要と判断した場合に、前記表示装置または前記光源の劣化を表示するよう指示する劣化検出過程と、
を有することを特徴とする性能劣化検出方法。
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