Information display device, information processing device, information display method, information processing method, information display program, and information processing program

Abstract

To prevent the luminance of a light emitting element from becoming lower than the luminance conforming to a request when correcting a decline in the luminance of the light emitting element due to aging degradation within the acting time of the light emitting element.SOLUTION: Provided is an information display device comprising: a display unit for displaying information by light emission of a plurality of light emitting elements; an acquisition unit for acquiring a target luminance required for the light emitting elements or a target output quantity convertible to the target luminance; and a light emission control unit for causing the light emitting elements to emit light with an initial correction output quantity larger than the output quantity corresponding to the target luminance at action start of the light emitting elements when correction for aging degradation is executed at least once after the action start of the light emitting elements that increases the output quantity of the light emitting elements to be higher than the output quantity determined from the target luminance in order to compensate for a decline in luminance due to the aging degradation of the light emitting elements.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an information display device, an information processing device, an information display method, an information processing method, an information display program, and an information processing program. [Background technology]

[0002] In an information display device that displays information by emitting light from a plurality of light-emitting elements, it is known that the light-emitting luminance of the light-emitting elements decreases due to deterioration of the light-emitting elements over time. In response to this, Patent Document 1 discloses a technique for increasing the light-emitting luminance of the light-emitting elements so as to compensate for the decrease in light-emitting luminance that accompanies deterioration over time. Specifically, the decrease in luminance is compensated for by operating the light-emitting elements with a current corresponding to the amount of light emitted, which is obtained by multiplying the light-emitting luminance of the light-emitting elements by the reciprocal of the relative amount of light emitted after deterioration over time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 2532222 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the current value of the light emission luminance is corrected to a larger value in this way, the degradation of the light emitting element progresses beyond the degradation over time corresponding to the set current value, and the decrease in luminance also accelerates. In contrast, the conventional technology has a problem in that the light emission control is not performed taking into account the accelerated degradation that accompanies such a correction of the current value.

[0005] The present invention has been made in consideration of the above-mentioned problems, and aims to prevent the luminance of a light-emitting element from decreasing below the luminance required when correcting the decrease in luminance of the light-emitting element due to deterioration over time during the operating time of the light-emitting element. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the information display device of the present invention comprises a display unit that displays information by emitting light from a plurality of light-emitting elements, an acquisition unit that acquires a target brightness required for the light-emitting elements or a target output amount that can be converted into the target brightness, and a light-emitting control unit that causes the light-emitting elements to emit light at an initial correction output amount that is greater than the output amount corresponding to the target brightness at the start of operation of the light-emitting elements when a time-deterioration correction that increases the output amount of the light-emitting elements beyond the output amount determined from the target brightness is performed at least once after the start of operation of the light-emitting elements in order to compensate for a decrease in brightness due to deterioration of the light-emitting elements over time.

[0007] Another aspect of the present invention is an information processing device comprising: an acquisition unit that acquires a target luminance required for a light-emitting element used in an information display device or a target output amount convertible to the target luminance; and an initial correction output amount determination unit that determines an output amount greater than the output amount corresponding to the target luminance as an initial correction output amount of the light-emitting element at the start of operation when, after the light-emitting element starts operating, a time degradation correction is performed at least once to make the output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance due to deterioration of the light-emitting element over time.

[0008] Another aspect of the present invention is an information display method including: a display step of displaying information by emitting light from a plurality of light-emitting elements; an acquisition step of acquiring a target luminance required for the light-emitting elements or a target output amount convertible to the target luminance; and an emission control step of causing the light-emitting elements to emit light at an initial correction output amount greater than the output amount corresponding to the target luminance at the start of operation of the light-emitting elements when a time-deterioration correction is performed at least once after the start of operation of the light-emitting elements to make the output amount of the light-emitting elements higher than the output amount determined from the target luminance in order to compensate for a decrease in luminance due to deterioration of the light-emitting elements over time.

[0009] Another aspect of the present invention is an information processing method including: an acquisition step of acquiring a target luminance required for a light-emitting element used in an information display device or a target output amount convertible to the target luminance; and an initial correction output amount determination step of determining an output amount greater than the output amount corresponding to the target luminance as an initial correction output amount of the light-emitting element at the start of operation when a time degradation correction is performed at least once after the start of operation of the light-emitting element to make the output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance due to deterioration of the light-emitting element over time.

[0010] Another aspect of the present invention is an information display program that causes a computer to function as an acquisition unit that acquires a target luminance or a target output amount convertible to the target luminance required for a light-emitting element used in an information display device, and as a light-emitting control unit that causes the light-emitting element to emit light at an initial corrected output amount that is greater than the output amount corresponding to the target luminance when an aging correction is performed at least once after the light-emitting element starts operating to make the output amount of the light-emitting element higher than the output amount determined from the target luminance in order to compensate for a decrease in luminance due to deterioration of the light-emitting element over time.

[0011] Another aspect of the present invention is an information processing program that causes a computer to function as an acquisition unit that acquires a target luminance required for a light-emitting element used in an information display device or a target output amount that can be converted into the target luminance, and an initial correction output amount determination unit that determines an output amount greater than the output amount corresponding to the target luminance as an initial correction output amount of the light-emitting element at the start of operation when, after the light-emitting element starts operating, a time degradation correction is performed at least once to make the output amount of the light-emitting element higher than the output amount determined from the target luminance in order to compensate for a decrease in luminance due to deterioration of the light-emitting element over time.

[0012] According to the configuration of the present invention described above, when correcting the decrease in luminance of the light-emitting element due to aging at least once during the operation period until the target life of the light-emitting element, the initial correction output amount at the start of operation of the light-emitting element is set to a value larger than the output amount corresponding to the target luminance. This makes it possible to prevent the luminance of the light-emitting element from decreasing below the luminance required even if the luminance decreases more than the aging. [Brief description of the drawings]

[0013] [Figure 1] 1 is a block diagram showing a configuration of an information display device according to a first embodiment. [Diagram 2] FIG. 13 is a diagram illustrating an example of a data configuration of a time-related deterioration correction rate table. [Diagram 3] 13 is a flowchart showing a deterioration correction process. [Figure 4] FIG. 11 is an explanatory diagram of a deterioration correction process. [Diagram 5] 13 is a flowchart showing an operation control process. [Figure 6] 13 is a flowchart showing an operation period process. [Figure 7] FIG. 11 is a block diagram showing a configuration of an information display system according to a second embodiment. [Figure 8] 1 is a conceptual diagram showing the relationship between the operation time of a light-emitting element and display luminance. [Figure 9] FIG. 13 is a graph showing the relationship between a set correction rate and an accelerated deterioration rate. [Figure 10] FIG. 13 is a graph showing the relationship between the number of time-dependent deterioration corrections, time-dependent deterioration, and accelerated deterioration. [Figure 11] FIG. 13 is a graph showing the relationship between the number of time-dependent deterioration corrections and the accelerated deterioration rate. [Figure 12] FIG. 13 is a graph showing the relationship between the residual luminance after aging and the residual luminance after accelerated degradation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] (Inventor's knowledge) First, the inventor's findings on the conventional technology will be described with reference to Figs. 8 to 12. Fig. 8 is a conceptual diagram of the relationship between the operation time of a light-emitting element and the display luminance. The horizontal axis of the graph in Fig. 8 indicates the operation time, and the vertical axis indicates the display luminance of the light-emitting element. The display luminance is an apparent luminance, for example, the luminance measured when the light-emitting element is emitting light. On the other hand, the set luminance is a control value (target luminance) set to emit light at that luminance. Since the display luminance decreases due to deterioration of the light-emitting element over time, at the initial point in time, the display luminance is the same value as the set luminance, but as time passes, the display luminance decreases and the difference between the display luminance and the set luminance becomes large. In the following, the display luminance and the set luminance are defined in this way to distinguish between the control value and the actual luminance value.

[0015] Here, the operating time is the time elapsed since the light-emitting element starts to operate. The solid line L11 on the graph indicates the time change in the light-emitting luminance after the start of operation of the light-emitting element shown in the prior art. When the light-emitting element is set to a current value corresponding to the set luminance and starts to operate, the light-emitting element deteriorates with the lapse of operating time, and the display luminance decreases. A decrease in the display luminance is observed during the operating period 0 to t1 of the solid line L11. Hereinafter, such deterioration of the light-emitting element due to the lapse of operating time is referred to as aging deterioration, and the degree of decrease in the display luminance due to aging deterioration is referred to as the aging deterioration rate. The aging deterioration rate is defined by (Equation 1). That is, the aging deterioration rate is a maximum value of 1.0 when there is no decrease in the display luminance, and approaches 0 as the decrease in the display luminance progresses. The aging deterioration rate is an example of an index value indicating the degree of aging deterioration, that is, the aging deterioration degree. The aging deterioration rate depends mainly on the operating current of the light-emitting element, although it also depends on the characteristics of the light-emitting element, such as the material of the light-emitting element. (Aging rate) = (display brightness decreased due to aging) / (set brightness) ... (Formula 1)

[0016] Furthermore, a technique for correcting the display luminance that has decreased due to deterioration over time to a target luminance has been conventionally known (see, for example, Japanese Patent No. 2532222). This involves increasing the current value so that the display luminance increases to a set luminance. With this technique, when the display luminance decreases due to deterioration over time of the light-emitting element, the display luminance can be increased to the target luminance by setting a new set value obtained by multiplying the set current value by the inverse of the deterioration rate over time. For example, when the target luminance is 4300 cd / m 2 Let's assume that the degradation rate over time at operating time t1 is 0.75. Also, at a current of 10 mA, the degradation rate is 4300 cd / m 2 In this case, according to (Equation 2), the correction current value to be set for the light emitting element during the operation time t1 is 13.33 mA. 10mA×(1 / 0.75)=13.33mA…(Formula 2) In the following, the correction for increasing the set value of the display luminance so that the display luminance that has decreased due to deterioration over time becomes the target luminance is referred to as deterioration over time correction. By increasing the current value from 10 mA to 13.33 mA during operation time t1, the display luminance can be raised to the target luminance during operation time t1, as shown by the solid line L11 in FIG. 8. Based on the same concept, deterioration over time correction is performed during the subsequent operation time t2 to raise the display luminance to the target luminance. In this way, the aim is to return the display luminance to the target luminance each time deterioration over time correction is performed.

[0017] In response to this, the inventors have found that when time degradation correction is performed, the light-emitting element deteriorates at a rate faster than the time degradation due to the light-emitting element being operated at a higher current. When time degradation correction is performed at the operating time t1 shown in FIG. 8, the deterioration progresses more rapidly than the time degradation after the operating time t1, and therefore the display luminance cannot be increased to the target luminance by the second time degradation correction. This state is shown by the dotted line L12. In this way, the display luminance after the operating time t1 is lower than the display luminance predicted from the time degradation.

[0018] Hereinafter, deterioration accelerated more than aging deterioration caused by an increase in current value due to aging correction is referred to as accelerated deterioration. Also, the degree of decrease in display luminance due to accelerated deterioration is referred to as accelerated deterioration rate. The accelerated deterioration rate is defined by (Equation 3). The accelerated deterioration rate is a maximum value of 1.0 when there is no accelerated deterioration, and approaches 0 as accelerated deterioration progresses. Note that the accelerated deterioration rate is an example of an index value indicating the degree of accelerated deterioration, that is, the degree of accelerated deterioration. Note that the accelerated deterioration rate depends mainly on the rate at which the operating current of the light-emitting element is increased (corrected), although it also depends on the characteristics of the light-emitting element. (Accelerated deterioration rate) = (display brightness reduced by accelerated deterioration) / (set brightness) ... (Equation 3)

[0019] Fig. 9 is a graph showing the relationship between the set correction rate and the accelerated deterioration rate. The horizontal axis of the graph in Fig. 9 shows the set correction rate, and the vertical axis shows the accelerated deterioration rate. Here, the set correction rate is a value obtained by (Equation 4), and is a value determined from the current value of the light-emitting element (or the luminance value of the light-emitting element) before and after the setting change. The accelerated deterioration rate is a maximum value of 1.0 when the correction rate is 1.0, and approaches 0 as the correction rate increases. (Setting correction factor) = (current value after setting change) / (current value before setting change) ... (Equation 4) 9 is obtained by simulating the set correction rate and the accelerated deterioration rate. In this way, it was found that the accelerated deterioration rate is uniquely determined based on the set correction rate.

[0020] 10 is a graph showing the relationship between the number of time-dependent deterioration corrections, time-dependent deterioration, and accelerated deterioration. The horizontal axis of the graph is the operating time (hrs), and the vertical axis is the residual luminance (cd / m 2 ) where the residual luminance is the display luminance after the luminance has decreased due to aging and / or accelerated aging. In the following description, the point in time x hours after the start of operation of the light-emitting element is simply referred to as "the point in time x hours."

[0021] The graph in Fig. 10 plots the remaining luminance when correction for deterioration over time is performed different times after the start of operation of the light-emitting element. Note that each point showing the remaining luminance on the graph in Fig. 10 is a value obtained by simulation. In the simulation, the relationship between the set correction rate and the accelerated deterioration rate shown in Fig. 9 is used. In the simulation, the light-emitting element is set to a luminance of 4300 cd / m 2 The device was operated for 60,000 hours at 10000 Hz. The remaining luminance was calculated by changing the number of times the time-related deterioration correction was performed during the 60,000 hours, from 1 time, 2 times, 3 times, 4 times, and so on. In each case, the time-related deterioration correction was performed at equal time intervals. That is, for example, when the time-related deterioration correction was performed once, 30,000 hours was set as one interval, and one correction was performed at the 30,000 hour point. When the time-related deterioration correction was performed twice, 20,000 hours was set as one interval, and time-related deterioration correction was performed every time 20,000 hours had passed, that is, at the 20,000 hour point and the 40,000 hour point. Note that, in order to make the graph easier to read, the graph in Fig. 10 shows the cases where no time-related deterioration correction was performed and the cases where time-related deterioration correction was performed once, twice, five times, and nine times, and the plots corresponding to the 3rd and 4th times are omitted.

[0022] In the graph of FIG. 10, point P0 indicates the set luminance (target luminance) at the start of operation of the light-emitting element. Point P10 indicated by an "x" indicates the remaining luminance when no aging correction is performed. Points P20 and P21 indicated by squares indicate the remaining luminance when aging correction is performed once. Points P30, P31, and P32 indicated by triangles indicate the remaining luminance when aging correction is performed twice. Points P40, P41, P42, P43, P44, and P45 indicated by inverted triangles indicate the remaining luminance when aging correction is performed five times. Points P50 to P59 indicated by circles indicate the remaining luminance when aging correction is performed nine times.

[0023] In FIG. 10, the straight line L3 passing through the point P10 and the point P0, which indicate the remaining brightness at 60,000 hours when no time degradation correction is performed, shows the state of the decrease in the remaining brightness according to the time degradation. In this way, the remaining brightness corresponding to the time degradation decreases in proportion to time. When the time degradation correction is performed once, the cause of deterioration is only time degradation until the first time degradation correction is performed, that is, until the time of 30,000 hours, the remaining brightness decreases along the straight line L3. However, when the time degradation correction is performed, the deterioration of the light-emitting element is accelerated due to the time degradation correction. When the time degradation correction is performed at the time of 30,000 hours, accelerated deterioration occurs thereafter, and the remaining brightness at the time of 60,000 hours becomes the point P21. That is, the remaining brightness at the time of 60,000 hours is lower than the point P10.

[0024] When the time-deterioration correction is performed twice, the residual luminance decreases along the line L3 until the first time of the time-deterioration correction, i.e., until the time of 20,000 hours, but thereafter, accelerated deterioration occurs, and the residual luminance decreases below the line L3. In this case, the residual luminance at the time of 60,000 hours is P32. Furthermore, the residual luminance P32 is a lower value than the residual luminance P21 when the time-deterioration correction is performed once. Similarly, when the number of time-deterioration corrections is increased to nine, the residual luminance at the time of 60,000 hours decreased as the number of time-deterioration corrections increased.

[0025] In the time-dependent deterioration correction, for example, when time-dependent deterioration correction is performed five times, a different correction current value is set for each of the five corrections. Therefore, the degree of accelerated deterioration differs for time-dependent deterioration correction at each timing. Therefore, when time-dependent deterioration correction is performed multiple times before the target life, the accumulated accelerated deterioration caused by each time-dependent deterioration correction becomes the accelerated deterioration rate at the target life.

[0026] Figure 11 is a graph showing the relationship between the number of time-dependent deterioration corrections and the accelerated deterioration rate at 60,000 hours for each correction. The more the number of time-dependent deterioration corrections is performed, the more the accelerated deterioration rate decreases. However, the degree to which the accelerated deterioration rate decreases as the number of corrections increases, and it was found that the accelerated deterioration rate can be considered to be almost constant when the time-dependent deterioration correction is performed five times or more. Curve L4 is an approximation obtained from the plot of the graph in Figure 9 by the least squares method.

[0027] 12 is a graph conceptually showing the relationship between the residual luminance after aging and the residual luminance after accelerated aging. The horizontal axis of the graph in FIG. 12 is the operating time (hrs), and the vertical axis is the residual luminance (cd / m 2 The target luminance of the light-emitting element is 4300cd / m 2 The target life is set at 60,000 hours, and the residual luminance after degradation at 60,000 hours of operation is 3000 cd / m based on the degradation rate of the light-emitting element. 2 The following describes the case where the time-dependent deterioration is caused by the time-dependent deterioration. The line L51 shows the time-dependent change in the remaining luminance corresponding to the time-dependent deterioration. The line L52 shows the time-dependent change in the remaining luminance corresponding to the time-dependent deterioration when the time-dependent deterioration correction is performed five times.

[0028] As shown by line L51, the remaining luminance after 60,000 hours is 3000cd / m 2 However, when accelerated deterioration occurs, the residual luminance is already 3000 cd / m at the time of 52000 hours, as shown by the line L52. 2 Therefore, the remaining luminance of the light-emitting element is set to 3000 cd / m2 at the end of the target life. 2 When the above condition is required, the requirement cannot be met by performing the time degradation correction of the conventional technology. In this way, by performing the time degradation correction, the target life cannot be met, and the replacement time of the light-emitting element is accelerated.

[0029] In response to this, the inventors have determined that the residual luminance in the target life corresponding to accelerated deterioration is equal to the residual luminance (3000 cd / m) required in the target life (60,000 hours).2 12, the initial luminance S1 is set to 4300 cd / m 2 This shows the time change in residual luminance corresponding to accelerated deterioration when the initial setting luminance is corrected to a higher value S2. In this way, by correcting the initial setting luminance to a higher value, the required residual luminance (3000 cd / m) for the target life (60,000 hours) can be achieved. 2 ) can be satisfied. Hereinafter, such a correction for making the initial setting luminance a higher value is referred to as an initial correction. The information display device described below performs an initial correction on the initial setting luminance. How the corrected setting luminance S2 is determined will be described in detail later.

[0030] (First embodiment) 1 is a block diagram showing the configuration of an information display device 10 according to a first embodiment. As described above, the information display device 10 performs control that takes into account accelerated deterioration when performing time-deterioration correction according to the time-deterioration of light-emitting elements. The information display device 10 includes a control unit 11, a recording medium 12, a display unit 13, a user I / F unit 14, and a clock unit 15. The control unit 11 is a computer that includes a CPU, RAM, ROM, etc., and executes various programs stored in the recording medium 12 and the ROM.

[0031] The recording medium 12 stores various information and various programs. The recording medium 12 stores, for example, a time-related deterioration table 121 and a time-related deterioration correction rate table 122. FIG. 2 is a diagram showing an example of the data configuration of the time-related deterioration table 121 and the time-related deterioration correction rate table 122.

[0032] As shown in FIG. 2, the aging table 121 stores the time elapsed from the start of operation, that is, the operating time, and the aging rate De at the operating time in association with each other. Furthermore, since the relationship between the operating time and the aging rate De varies depending on the set luminance, the aging table 121 stores the operating time and the aging rate De for each of a plurality of set luminances in association with each other. The control unit 11 can specify the aging rate De at the operating time based on the set luminance and the operating time by referring to the aging table 121. As another example, a function indicating the relationship between the operating time and the aging rate is stored in the recording medium 12 for each set luminance, and the control unit 11 may specify the aging rate De at the operating time based on the set luminance and the operating time by using this function. In this case, the aging table 121 may not be stored in the recording medium 12. It is assumed that the aging table 121 stores values ​​according to the characteristics of the light-emitting element 131 and the set luminance.

[0033] The time-deterioration correction rate table 122 stores the time-deterioration rate De and the time-deterioration correction rate Ce in association with each other. The control unit 11 can specify the time-deterioration correction rate Ce from the time-deterioration rate De by referring to the time-deterioration correction rate table 122. As described above, the time-deterioration correction rate Ce is an index value of the correction amount of the current value related to the time-deterioration correction. The time-deterioration correction rate Ce is the reciprocal of the time-deterioration rate De. That is, the time-deterioration correction rate Ce has a minimum value of 1, and the higher the value, the greater the degree of correction. As another example, the control unit 11 may specify the time-deterioration correction rate Ce by calculating the reciprocal of the time-deterioration rate De instead of referring to the time-deterioration correction rate table 122. In this case, the time-deterioration correction rate table 122 may not be stored in the recording medium 12.

[0034] Returning to FIG. 1 for the explanation, the display unit 13 includes a plurality of light-emitting elements 131 and a driver circuit 132. The light-emitting elements 131 are LEDs (light-emitting diodes). The plurality of light-emitting elements 131 included in the display unit 13 may be LEDs of one color, two colors, or three colors. The driver circuit 132 controls the light emission of the light-emitting elements 131. Specifically, the driver circuit 132 causes the light-emitting elements 131 to emit light with a current value input from the control unit 11. The user I / F unit 14 is an interface unit through which the user inputs instructions and provides various information to the user, and includes an output unit for images and sounds and an input unit for instructions by the user. The clock unit 15 counts the time.

[0035] The information display program 110 is a program for causing the computer of the information display device 10 to function as an acquisition unit 111, an initial correction output amount determination unit 112, and an emission control unit 113. The processes of the acquisition unit 111, the initial correction output amount determination unit 112, and the emission control unit 113 are realized by the CPU of the control unit 11 executing the information display program 110. In other words, in the following, the processes described as being performed by the acquisition unit 111, the initial correction output amount determination unit 112, and the emission control unit 113 are processes executed by the control unit 11.

[0036] The acquisition unit 111 acquires the target brightness, target lifespan, target remaining brightness, and number of corrections required for the light-emitting element 131. Here, the target brightness is assumed to be equal to the set brightness at the start of operation (initial setting brightness). The acquisition unit 111 of this embodiment acquires the target brightness, but may instead acquire a target output amount that can be converted into the target brightness. The target lifespan is the end point of the period during which the light-emitting element 131 can operate. The target remaining brightness is the remaining brightness during the target lifespan. The number of corrections will be described later.

[0037] The initial correction output amount determination unit 112 determines the initial correction output amount of the light-emitting element 131. Here, the initial correction output amount is the output amount of the light-emitting element 131 at the beginning, i.e., at the start of operation, and is the output amount after being corrected from the target output amount corresponding to the target luminance. In this embodiment, the output amount is indicated by luminance, and is referred to as initial correction luminance. However, the output amount may be luminance or a value convertible to luminance, and may be a current value or power amount convertible to luminance. In the information display device 10 of this embodiment, initial correction is performed by setting the initial correction luminance to the light-emitting element 131 instead of the target luminance.

[0038] Here, the initial correction luminance will be described. As described with reference to Fig. 12, in order for the remaining luminance due to aging and accelerated aging to satisfy the target remaining luminance, the set luminance of the light-emitting element 131, i.e., the initial set luminance, should be set to a value higher than the target luminance. The initial correction output amount determination unit 112 determines this initial set luminance as the initial correction luminance. The light emission control unit 113 controls the light emission of the light-emitting element 131. The processing of each unit will be described below.

[0039] Fig. 3 is a flowchart showing the deterioration correction process executed by the control unit 11. Fig. 4 is an explanatory diagram of the deterioration correction process. The deterioration correction process is a process executed by a user or manager of the information display device 10 at the timing when the power is turned on to start using the information display device 10. Here, the user is the person who purchases the information display device 10, and the manager is the person in charge of maintenance on the sales side or user side of the information display device 10. Note that, in the following, as explained with reference to Fig. 10, the target luminance Ls is 4300 cd / m 2 An example will be described in which the target life is 60,000 hours and the number of time-related deterioration corrections (hereinafter referred to as the number of corrections) is 5. Here, the fifth time-related deterioration correction occurs at 50,000 hours, and the 60,000th time occurs 10,000 hours after the fifth time-related deterioration correction.

[0040] First, the acquisition unit 111 acquires the target luminance Ls, the target life Te, the target remaining luminance Let, and the number of corrections via the user I / F unit 14 (step S100). The target luminance Ls, the target life Te, the target remaining luminance Let, and the number of corrections are all input by the user or the administrator via the user I / F unit 14. The number of corrections is initially set to 5, which is recommended by the manufacturer of the information display device 10, and is displayed on the setting screen of the user I / F unit. Furthermore, the target luminance Ls, the target life Te, and the target remaining luminance Let are also displayed as initial settings. It is up to the user to decide whether to utilize the initial settings or to input any value. The initial setting value is intended to save the user, who is the purchaser, the trouble of inputting his / her own order specifications (purchase specifications) every time he / she purchases. That is, it is assumed that at least the initial setting value is initially set according to the user's purchase specifications. The acquisition unit 111 only needs to acquire the target luminance Ls, the target life Te, the target remaining luminance Let, and the number of corrections, and the acquisition method is not limited to the embodiment. As another example, the information display device 10 may include a communication unit, and the acquisition unit 111 may acquire the target luminance Ls, the target life Te, the target remaining luminance Let, and the number of corrections from an external device via the communication unit.

[0041] Here, the number of corrections will be explained. As explained with reference to Fig. 10 and Fig. 11, the degree of accelerated deterioration depends on the number of time-related deterioration corrections. On the other hand, the timing at which time-related deterioration corrections are performed after the information display device 10 is sold is not set, and it is assumed that a user or manager will perform time-related deterioration corrections at any timing and any number of times. Therefore, it is preferable to perform initial correction based on the case where the accelerated deterioration rate is minimum (the degree of accelerated deterioration is maximum). This is because, if initial correction corresponding to the case where the accelerated deterioration rate is minimum is performed, the remaining luminance required for the target life can be satisfied even if the number of time-related deterioration corrections is less than the maximum number.

[0042] As described with reference to FIG. 11, the accelerated deterioration rate tends to decrease as the number of time-dependent deterioration corrections increases. On the other hand, the target remaining luminance (3000 cd / m) required for the target life (60,000 hours) 2 ) is a degradation rate of 0.7. When deciding the number of corrections, it is necessary to keep the rate of change at a level that does not allow the human eye to distinguish any changes in luminance. Generally, the luminance contrast that humans can distinguish is considered to be 0.05 or higher. Since a degradation rate of 0.7 is a luminance change range of 0.3, dividing this by a luminance contrast of 0.05 results in six equally spaced stages. In other words, the maximum number of corrections for degradation over time (number of luminance changes) is 5 times.

[0043] When the number of aging corrections increases from 6 or more to infinity (real-time correction), the remaining luminance at the target lifespan decreases accordingly, and the target remaining luminance of 3000 cd / m 2 In other words, the difference between the remaining luminance and the target remaining luminance (3000 cd / m2) at the target life span becomes larger. 2 ) cannot be satisfied.

[0044] Therefore, in the information display device 10 of this embodiment, the reference number is set to five times of time degradation correction, and the reference number is displayed as the initial setting. Note that it is assumed here that the five times of time degradation correction are performed at equal time intervals.

[0045] The subsequent processing of steps S102 to S118 is processing for determining the initial correction output amount. First, the initial correction output amount determination unit 112 divides the operation period until the target life into equal intervals, the number of intervals being equal to the number of corrections plus 1, based on the number of corrections and the target life (step S102). Then, the initial correction output amount determination unit 112 specifies the time of each interval, that is, the interval operation time. In the case of 5 corrections and a target life of 60,000 hours, 60,000 hours is equally divided into 6 intervals. That is, the interval operation time is 10,000 hours. As a result, six intervals are generated. In this embodiment, the period from the start of operation to 10,000 hours is called the initial interval, the period from 10,000 hours to 20,000 hours is called the first interval, the period from 20,000 hours to 30,000 hours is called the second interval, the period from 30,000 hours to 40,000 hours is called the third interval, the period from 40,000 hours to 50,000 hours is called the fourth interval, and the period from 50,000 hours to 60,000 hours is called the fifth interval. In addition, the timing of the correction of deterioration over time is called the correction timing. Furthermore, 10,000 hours will be referred to as the first correction timing, 20,000 hours as the second correction timing, 30,000 hours as the third correction timing, 40,000 hours as the fourth correction timing, and 50,000 hours as the fifth correction timing.

[0046] Next, the initial correction output amount determination unit 112 specifies the time-dependent deterioration rate Dei (i=1, ..., n: n is the number of corrections) at each correction timing and the time-dependent deterioration rate Det at the target life (step S104). For the first to fifth correction timings in the above example, the corresponding time-dependent deterioration rates De1 to De5 are specified. Specifically, the initial correction output amount determination unit 112 specifies the time-dependent deterioration rates De1 to De5 for each correction timing by referring to the table of the target luminance Ls obtained in step S100 in the time-dependent deterioration table 121. The time-dependent deterioration rates De1 to De5 obtained from the time-dependent deterioration table 121 are shown in FIG. 4. Target luminance 4300 cd / m 2 For the first correction timing of 10,000 hours, a deterioration rate De1 over time of "0.95" is specified. Similarly, for the second correction timing of 20,000 hours, a deterioration rate De2 over time of "0.90" is specified.

[0047] Next, the initial correction output amount determination unit 112 determines the time-related deterioration correction rate Cei of each correction timing based on the time-related deterioration rate Dei of each correction timing determined in step S104 (step S106). Specifically, the initial correction output amount determination unit 112 refers to the time-related deterioration correction rate table 122 and determines the time-related deterioration correction rate Cei associated with the time-related deterioration rate Dei of each correction timing determined in step S104 as the time-related deterioration correction rate Cei of each correction timing. As shown in FIG. 4, for example, the time-related deterioration correction rate Ce1 of the first correction timing is determined from the time-related deterioration rate De1 of the first correction timing.

[0048] The time-related deterioration correction rates Ce1 to Ce5 for the first to fifth correction timings in the above example are determined based on the time-related deterioration rates De1 to De5, respectively. For example, the time-related deterioration correction rate Ce1 "1.053" is determined for the time-related deterioration rate De1 "0.95" for the first correction timing. Similarly, the time-related deterioration correction rate Ce2 "1.111" is determined for the time-related deterioration rate De2 "0.90" for the second correction timing.

[0049] Next, the initial correction output amount determination unit 112 determines the correction current value Iei for each corresponding correction timing based on the time-deterioration correction factor Cei for each correction timing determined in step S106 (step S108). Here, the correction current value Iei is a current value set to correct the time-deterioration. The initial correction output amount determination unit 112 obtains the correction current value Iei for each correction timing by multiplying the current value corresponding to the target luminance of the light-emitting element by the time-deterioration correction factor Cei for each correction timing.

[0050] For example, target luminance 4300cd / m 2Assume that the current value corresponding to is 10 mA. In this case, the values ​​obtained by multiplying the deterioration correction rate of each of the first to fifth correction timings in the above example by 10 (mA) are specified as the correction current values ​​Ie1 to Ie5 of each correction timing. As shown in FIG. 4, for example, the deterioration correction rate Ce1 "1.0526" of the first correction timing is multiplied by 10 to specify the correction current value Ie1 "10.526 mA". Similarly, the deterioration correction rate Ce2 "1.111" of the second correction timing is multiplied by 10 to specify the correction current value Ie2 "11.11 mA".

[0051] Next, the initial correction output amount determination unit 112 determines the section correction factor Hei of each corresponding correction timing based on the correction current value Iei of each correction timing determined in step S108 (step S110). Here, the section correction factor Hei is the ratio of the correction current value of a certain correction timing to the correction current value of the previous correction timing. That is, the section correction factor Hei is a value obtained by dividing the correction current value of the i-th correction timing by the correction current value of the (i-1)th correction timing, and is defined by (Equation 5). (Interval correction rate Hei) = (corrected current value Iei) / (corrected current value Ie(i-1)) ... (Equation 5) That is, the section correction factor Hei of a certain correction timing has a minimum value of 1.0 when there is no change between the correction current value of that correction timing and the correction current value of the correction timing immediately before that correction timing, and the larger the difference between them, the larger the value becomes.

[0052] Section correction factors He1 to He5 are specified for the first to fifth correction timings in the above example. As shown in FIG. 4, for example, the correction current value Ie3 at the third correction timing is a value obtained by dividing the correction current value at the third correction timing by the correction current value at the second correction timing. However, no time degradation correction is performed from the start of operation to the first correction timing, and there is no accelerated degradation. Therefore, the section correction factor at the correction timing at the start of operation and He1 at the first correction timing are both "1.0000".

[0053] The section correction factor He1 indicates the degree of current correction in the initial section, but since the current until the first correction timing remains at the current value corresponding to the target brightness (10 mA in the above example), the section correction factor He1 at the first correction timing is a fixed value of 1.0000. After that, at the first correction timing, the correction current value Ie1 is adjusted to 10.526 mA, and the first section starts.

[0054] The section correction factor He2 for the second correction timing will be explained. The section correction factor He2 indicates the degree of current correction for the second section. The second section starts with the correction current value Ie2. The section correction factor He2 is calculated as 1.0556 from (Equation 6) based on (Equation 5). Note that the section correction factor Hei for the third and subsequent correction timings can be determined in the same way as the section correction factor He2. He = (Ie2) / (Ie1) =11.111 / 10.526 =1.0556…(Formula 6)

[0055] Next, the initial correction output amount determination unit 112 determines the section accelerated deterioration rate Kei of each corresponding correction timing based on the section correction rate Hei of each correction timing determined in step S110 (step S112). The section accelerated deterioration rate Kei is the degree of deterioration of the light-emitting element caused by the correction of the current value of the section correction rate Hei (increase in the current value). The relationship between the section correction rate Hei and the section accelerated deterioration rate Kei coincides with the relationship between the set correction rate and the accelerated deterioration rate described with reference to FIG. 9. Therefore, the initial correction output amount determination unit 112 obtains the section accelerated deterioration rate Kei based on the relationship between the set correction rate and the accelerated deterioration rate described with reference to FIG. 9. More specifically, the initial correction output amount determination unit 112 uses a function corresponding to the graph shown in FIG. 9 to substitute the section correction rate Hei for the set correction rate, thereby obtaining the obtained accelerated deterioration rate as the section accelerated deterioration rate Kei.

[0056] The section accelerated deterioration rates Ke1 to Ke5 are identified for the first to fifth correction timings, respectively. As shown in Fig. 4, for example, the section correction rate He1 at the first correction timing is a fixed value of "1.0000", so the section accelerated deterioration rate Ke1 is "1.000". The section accelerated deterioration rate Ke2 at the second correction timing is identified as "0.9377" from the section correction rate He2 of "1.0556". The section accelerated deterioration rate Ke3 at the third correction timing is identified as "0.9342" from the section correction rate He3 of "1.0589".

[0057] Next, the initial correction output amount determination unit 112 determines the cumulative accelerated deterioration rate Aei of each corresponding correction timing based on the section accelerated deterioration rate Kei of each correction timing determined in step S112 (step S114). The section accelerated deterioration rate Kei is the accelerated deterioration rate in the period from the (i-1)th correction timing to the ith correction timing, while the cumulative accelerated deterioration rate Aei is the accelerated deterioration rate in the period from the start of operation to the ith correction timing. The initial correction output amount determination unit 112 determines the cumulative accelerated deterioration rate Aei by (Equation 7). (Cumulative accelerated deterioration rate Aei) = (cumulative accelerated deterioration rate Ae(i-1)) × (section accelerated deterioration rate Kei) ... (Equation 7) That is, the cumulative accelerated deterioration rate Aei at the i-th correction timing is the cumulative accelerated deterioration rate Ae(i-1) at the (i-1)th (immediately preceding) correction timing multiplied by the section accelerated deterioration rate Kei at the i-th correction timing.

[0058] The cumulative accelerated deterioration rate Aei has a maximum value of "1.0000" when the cumulative accelerated deterioration rate Ae(i-1) at the (i-1)th correction timing and the section accelerated deterioration rate Kei at the i-th correction timing are both "1.0000", and approaches 0 as the section accelerated deterioration rate increases. The cumulative accelerated deterioration rate Aei depends on the correction current of the light-emitting element in each section between the correction timings.

[0059] The cumulative accelerated degradation rate Aei is an example of an index value, i.e., an example of a degree of accelerated degradation, that indicates the degree to which a light-emitting element deteriorates at a rate greater than the rate of deterioration over time due to operating the light-emitting element at a higher current when time-degradation correction is performed.

[0060] The cumulative accelerated deterioration rate Ae1 at the first correction timing will be described. In the period from the start of operation to the first correction timing, the current remains at the set value. Therefore, the section accelerated deterioration rate Ke1 at the first correction timing is "1.0000". In addition, the first cumulative accelerated deterioration rate Ae1 is the time-dependent deterioration rate De1.

[0061] For the first to fifth correction timings in the above example, the corresponding cumulative accelerated deterioration rates Ae1 to Ae5 are identified. For example, the cumulative accelerated deterioration rate Ae1 at the first correction timing is equal to the time-dependent deterioration rate De1, and is therefore "0.9500". In addition, the cumulative accelerated deterioration rate Ae2 at the second correction timing is "0.8908" using (Equation 7) (by (Equation 8)). (Cumulative accelerated deterioration rate Ae2) = (cumulative accelerated deterioration rate Ae1) × (interval accelerated deterioration rate Ke2) =0.9500×0.9377 =0.8908…(Equation 8)

[0062] In step S114, the initial correction output amount determination unit 112 further specifies the accumulated accelerated deterioration rate Aet at the target life by performing a calculation similar to (Equation 7) for the n-th accumulated accelerated deterioration rate Aen. (Cumulative accelerated deterioration rate Aet) = (cumulative accelerated deterioration rate Ae(n-1)) × (interval accelerated deterioration rate Ken) ... (Equation 9) Since the current value is not corrected during the target life, the time-dependent deterioration rate De during the operation time until the target life for the corrected current value at the last correction timing is used as the section accelerated deterioration rate Ken.

[0063] In the above example, the cumulative accelerated deterioration rate Aet at the target life is calculated to be "0.6669" using (Equation 9) (according to (Equation 10)). (Cumulative accelerated deterioration rate Aet) =(cumulative accelerated deterioration rate Ae5) × (13.333mA, degradation rate over time Det(Ien) at 60,000 hours of operation (target life)) =0.7171×0.93 =0.6669…(Equation 10)

[0064] Next, the initial correction output amount determination unit 112 specifies an offset rate Fs (step S116). The offset rate Fs is a value corresponding to the degree of initial correction. The offset rate Fs is a ratio of the time-dependent deterioration rate Det in the target life to the accumulated accelerated deterioration rate Aet in the target life, and can be calculated by (Equation 11). Here, the time-dependent deterioration rate Det is a deterioration rate corresponding to the set luminance. Fs = Det / Aet (Eq. 11) As described above, when the aging rate Det is "0.70" and the cumulative accelerated aging rate Aet is "0.6669", the offset rate Fe is calculated to be "1.05" using (Equation 11) (according to (Equation 12)). Fs=0.70 / 0.6669=1.05…(Equation 12)

[0065] Next, the initial correction output amount determination unit 112 specifies the initial correction luminance Lsc (step S118). The initial correction luminance Lsc is the set luminance at the start of operation, and is a value after initial correction is performed on the target luminance (original set luminance). The initial correction output amount determination unit 112 specifies the initial correction luminance Lsc by (Equation 13) based on the target luminance and the offset rate Fs. Lsc=Ls×Fs…(Formula 13) As shown above, the target luminance is 4300cd / m 2When the offset rate is 1.05, the initial correction luminance Lsc is 4515 cd / m using (Equation 13) (according to (Equation 14)). 2 It becomes. Lsc=4300(cd / m 2 ) × 1.05 = 4515 (cd / m 2 ) …(Formula 14)

[0066] Next, the initial correction output amount determination unit 112 sets the initial correction luminance Lsc (step S120). That is, the initial correction output amount determination unit 112 stores the initial correction luminance Lsc in a recording unit such as the recording medium 12. As described above, the initial correction output amount determination unit 112 can obtain the initial correction luminance Lsc based on the relationship between the aging deterioration rate and the accelerated deterioration rate in the target life. Here, the initial correction luminance Lsc corresponds to the set luminance of the point S2 of the straight line L53 shown in FIG. 12.

[0067] 5 is a flowchart showing the operation control process. When the light emission control unit 113 receives a start instruction via the user I / F unit 14, it starts the operation control process. The operation control process is a process for controlling the operation of the light emitting element 131. The light emission control unit 113 first sets an initial correction luminance Lsc for the light emitting element 131, and starts light emission (operation) at the initial correction luminance Lsc (step S200). As in the above example, when the target luminance is set to 4300 cd / m 2 is given, the light emitting element 131 has an initial luminance of 4515 cd / m 2 Starts lighting.

[0068] Next, the light emission control unit 113 refers to the clock unit 15 and starts counting the elapsed time from the start of operation, i.e., the operation time (step S202). Next, the light emission control unit 113 performs operation period processing (step S204). The operation period processing is a control processing for controlling to perform time deterioration correction at the correction timing during the operation period.

[0069] FIG. 6 is a flowchart showing the operation period process. The light emission control unit 113 refers to the operation time and judges whether the time of the process is a correction timing or not (step S300). If it is not a correction timing (N in step S300), the light emission control unit 113 ends the operation period process and proceeds to step S206 (FIG. 5). If it is a correction timing (Y in step S300), the light emission control unit 113 refers to the deterioration table 121 and specifies the deterioration rate Dei at the correction timing Tmi (step S302). For example, in the example of FIG. 4, when the third correction timing, that is, Tm3, is "30,000 hours", "0.85" is specified as the deterioration rate De3.

[0070] Next, the light emission control unit 113 refers to the time-related deterioration correction rate table 122 and specifies the time-related deterioration correction rate Cei based on the time-related deterioration rate Dei (step S304). For example, when the time-related deterioration rate De3 is "0.85", "1.176" is specified as the time-related deterioration correction rate Ce3. Next, the light emission control unit 113 specifies the time-related deterioration correction luminance Lsci based on the initial correction luminance Lsc and the time-related deterioration correction rate Cei (step S306). Specifically, the light emission control unit 113 specifies the value obtained by multiplying the initial correction luminance Lsc by the time-related deterioration correction rate Cei as the time-related deterioration correction luminance Lsci. For example, when the initial correction luminance Lsc is "4515" and the time-related deterioration correction rate Ce3 is "1.176", the time-related deterioration correction luminance Lsci is specified as "5310 cd / m 2 Next, the light emission control unit 113 sets the time degradation corrected luminance Lsci as the set luminance of the light emitting element 131, causes the light emitting element 131 to emit light at the emission luminance (step S308), and then the process proceeds to step S206 (FIG. 5).

[0071] 5, the light-emission control unit 113 determines whether the operation time has reached the target life Te. If the operation time has reached the target life (Y in step S206), the light-emission control unit 113 notifies the replacement of the light-emitting element 131 (step S208) and ends the operation control process. If the operation time has not reached the target life (N in step S206), the light-emission control unit 113 advances the process to step S204. The process of step S204 may be performed at regular time intervals.

[0072] As described above, after the start of operation of the light-emitting element 131, in order to compensate for the decrease in luminance due to deterioration over time of the light-emitting element 131, luminance correction is performed at least once to make the output amount (luminance, current value, etc.) of the light-emitting element 131 higher than the output amount determined from the target luminance. In this case, the light-emitting control unit 113 causes the light-emitting element 131 to emit light at an initial correction output amount (initial correction luminance Lsc) that is higher than the output amount corresponding to the target luminance when the operation of the light-emitting element 131 starts. Thereby, the information display device 10 of this embodiment can prevent the luminance of the light-emitting element from decreasing below the luminance according to the request when correcting the decrease in the emitted light luminance due to deterioration over time within the operation period until the target life.

[0073] Furthermore, the initial correction output amount determination unit 112 of the present embodiment determines the initial correction output amount based on the target remaining luminance Let in the target life Te. This makes it possible to determine the initial correction output amount that satisfies the target remaining luminance Let.

[0074] In addition, in order to prevent the luminance from falling below the target luminance even if accelerated deterioration occurs, the initial correction luminance Lsc may be set to a luminance greater than the initial correction luminance Lsc. However, if the initial correction luminance Lsc is set too large, the accelerated deterioration will progress rapidly, and the target remaining luminance Let at the target life Te will not be satisfied. In contrast, the initial correction luminance Lsc determined by the information display device 10 has an increase from the target luminance Ls of less than 10%. This makes it possible to suppress the accelerated deterioration caused by the initial luminance being set to a high value to a negligible level. Furthermore, by not increasing the luminance more than necessary in this way, it is possible to suppress unnecessary power consumption.

[0075] Furthermore, after the initial correction luminance Lsc is set and the operation of the light emitting element 131 starts, correction according to deterioration over time can be performed in the same manner as in the conventional method, so there is no need to change the control after the start of operation.

[0076] Second embodiment Next, a second embodiment will be described. Fig. 7 is a block diagram showing a configuration of an information display system 1 according to the second embodiment. The information display system 1 of the second embodiment includes an information processing device 20 and an information display device 30. In the second embodiment, the information processing device 20 determines an initial corrected luminance Lsc of a light-emitting element 331 of a display unit 33 of the information display device 30, and displays this on a display serving as a user I / F unit 24.

[0077] The information processing device 20 includes a control unit 21, a recording medium 22, and a user I / F unit 24. The recording medium 22 stores a time-related deterioration table 221 and a time-related deterioration correction rate table 222. The time-related deterioration table 221 and the time-related deterioration correction rate table 222 are similar to the time-related deterioration table 121 and the time-related deterioration correction rate table 122 described in the first embodiment with reference to FIG.

[0078] Moreover, the control unit 21 executes an information processing program 210. The information processing program 210 is a program for causing the computer of the information processing device 20 to function as an acquisition unit 211, an initial correction output amount determination unit 212, and a display processing unit 213. The functions of the acquisition unit 211 and the initial correction output amount determination unit 212 are similar to those of the acquisition unit 111 and the initial correction output amount determination unit 112 in the first embodiment, respectively. The control unit 21 executes steps S100 to S118 of the deterioration correction process described in the first embodiment. Then, the display processing unit 213 displays the initial correction luminance Lsc determined by the initial correction output amount determination unit 212 on a display as the user I / F unit 24.

[0079] The information display device 30 includes a control unit 31, a recording medium 32, a display unit 33, a user I / F unit 34, and a clock unit 35. The display unit 33 includes a light-emitting element 331 and a driver circuit 332. The information display device 30 is almost similar to the information display device 10 of the first embodiment. The following describes the information display device 30, focusing mainly on the differences from the information display device 10 of the first embodiment.

[0080] The control unit 31 executes an information display program 310. The information display program 310 is a program for causing the computer of the information display device 30 to function as a light emission control unit 313. The function of the light emission control unit 313 is substantially similar to the function of the light emission control unit 113 of the first embodiment.

[0081] In the second embodiment, a user or an administrator checks the initial correction luminance Lsc displayed on the display of the information processing device 20 and inputs it to the information display device 30 via an input unit serving as the user I / F unit 34. In response to this, the light emission control unit 313 of the control unit 31 sets the initial correction luminance Lsc as an initial setting value of the light emitting element 331. Thereafter, the light emission control unit 313 controls the luminance of the light emitting element 331 during operation by executing the operation control process described in the first embodiment with reference to FIG.

[0082] As another example, when the information processing device 20 and the information display device 30 can communicate with each other via a network, the information processing device 20 may transmit the initial correction luminance Lsc to the information display device 30. In this case, the information display device 30 may set the initial correction luminance Lsc received via the network for the light-emitting element 331.

[0083] In the information display system 1 of the second embodiment, when the decrease in luminance due to deterioration over time is corrected within the operating period until the target life Te, the luminance of the light-emitting element can be prevented from decreasing below the luminance required.

[0084] (Modification) In this embodiment, the acquisition unit 111 acquires the target brightness Ts, but instead of the target brightness Ts, a value convertible to the target brightness Ts may be acquired. Here, examples of values ​​convertible to the target brightness Ts include a current value and a power value. When these values ​​are acquired, the control unit 11 converts these values ​​to the target brightness Ts and performs degradation correction processing.

[0085] Similarly, although the initial correction output amount determination unit 112 according to this embodiment determines the initial current value of the light emitting element 131, the determined value is not limited to the current value. The initial correction output amount determination unit 112 may determine a value that can be converted into display luminance, for example, the initial correction output amount determination unit 112 may determine the display luminance. In this case, the light emission control unit 113 may cause the light emitting element 131 to emit light at a current value for achieving the display luminance. Other values ​​that can be converted into display luminance include voltage and power.

[0086] In this embodiment, the light emission control unit 113 sets the initial correction luminance Lsc determined by the initial correction output amount determination unit 112. However, the light emission control unit 113 only needs to set a luminance higher than the target luminance Ls, and the luminance to be set is not limited to the initial correction luminance Lsc. As another example, when performing time deterioration correction, the light emission control unit 113 may set a value obtained by multiplying the target luminance by an arbitrary value as the initial correction luminance.

[0087] In addition, the initial correction output amount determination unit 112 may determine the initial correction output amount so as to satisfy the target remaining luminance at a predetermined timing, and the timing corresponding to the target remaining luminance is not limited to the target life. As another example, the acquisition unit 111 may acquire the target remaining luminance at a point halfway through the target life from the start of operation, and the initial correction output amount determination unit 112 may determine the initial correction output amount based on the target remaining luminance at the point halfway through the target life.

[0088] The deterioration correction process may be executed either before or after shipment of the information display device 10. When the deterioration correction process is executed before shipment, the information display device 10 is shipped in a state in which the initial correction luminance Lsc is set for the light-emitting element 131. Therefore, after shipment, the information display device 10 only needs to perform control according to the conventional time deterioration correction.

[0089] As another example, the acquisition unit 111 may acquire the timing of the time-related deterioration correction and the number of times of time-related deterioration correction, and the initial correction output amount determination unit 112 may determine the initial correction luminance based on the timing and the number of times. Even if the number of times of time-related deterioration correction is the same, when the timing of the time-related deterioration correction is different, it corresponds to the difference in the degree of accelerated deterioration. Furthermore, in this case, the initial correction output amount determination unit 112 determines a larger value as the initial correction output amount as the number of times of correction is larger. Note that the initial correction output amount determination unit 112 may determine a value smaller than the second initial correction output amount determined for the second number of times as the first initial correction output amount determined for at least the first number of times. Here, it is assumed that the second number of times is larger than the first number of times.

[0090] The technique of the present invention can also be applied as a program or method. The above-mentioned system, program, and method may be realized as a single device or may be realized by using other components, and include various aspects. For example, it is possible to provide a method or program realized by the above-mentioned system. Also, it is possible to change it as appropriate, such as partly being software and partly being hardware. Furthermore, the invention can also be established as a recording medium of a program that controls the device. Of course, the recording medium of the software may be a magnetic recording medium or a semiconductor memory, and any recording medium developed in the future can be considered in exactly the same way. [Explanation of symbols]

[0091] 1...information display system, 10, 30...information display device, 11, 21, 31...control unit, 12, 22, 32...recording medium, 13, 33...display unit, 14, 24, 34...user I / F unit, 15, 35...clock unit, 20...information processing device, 30...information display device, 110, 310...information display program, 111, 211...acquisition unit, 112, 212...initial correction output amount determination unit, 113, 313...light emission control unit, 121, 221, 321...aging deterioration table, 122, 222, 322...aging deterioration correction rate table, 131, 331...light emitting element, 132, 332...driver circuit, 210...information processing program, 213...display processing unit

Claims

1. a display unit that displays information by emitting light from a plurality of light-emitting elements; an acquisition unit that acquires a target luminance set as a luminance for causing the light emitting element to emit light or a target output amount that can be converted into the target luminance based on a user input; a light-emitting control unit that, after the operation of the light-emitting element starts, executes at least once a time-deterioration correction for making an output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance accompanying deterioration of the light-emitting element due to the passage of the operation time, based on an inverse of a deterioration rate of the light-emitting element corresponding to an operation time after the operation of the light-emitting element starts at a correction timing, and causes the light-emitting element to emit light at an initial correction output amount higher than the output amount corresponding to the target luminance at the start of the operation of the light-emitting element; An information display device comprising:

2. An initial correction output amount determination unit that determines the initial correction output amount based on a target remaining luminance at a predetermined timing after the start of the operation, the target remaining luminance being predicted from deterioration over time of the light-emitting element, The information display device according to claim 1 , wherein the light emission control unit causes the light emitting element to emit light at the initial correction output amount determined by the initial correction output amount determination unit.

3. The acquisition unit further acquires a target life span of the light-emitting element, The information display device according to claim 2 , wherein the initial correction output amount determination unit determines the initial correction output amount based on the target remaining luminance in the target lifespan predicted from deterioration over time of the light-emitting element.

4. The initial correction output amount determination unit is determining a degree of accelerated deterioration, which is a degree of luminance decrease accelerated by the time-deterioration correction, based on a rate of change in an output amount of light emission luminance in the time-deterioration correction during the period from the start of operation to the target life and the number of times the time-deterioration correction is executed during the period from the start of operation to the target life; determining the initial correction output amount based on the degree of accelerated deterioration; The information display device according to claim 3.

5. 5. The information display device according to claim 1, wherein the light-emitting control unit corrects an output amount of the light-emitting element at the timing of the time-deterioration correction based on a display luminance predicted from the time-deterioration during the elapsed time from the start of operation to the timing of the time-deterioration correction.

6. The acquisition unit further acquires a timing of the time-related deterioration correction and a number of times the time-related deterioration correction is performed, The information display device according to claim 2 , wherein the initial correction output amount determination unit specifies the initial correction output amount based on a timing of the time deterioration correction and a number of times the time deterioration correction is performed.

7. 7. The information display device according to claim 6, wherein the initial correction output amount when the number of times of the time deterioration correction is a first number is smaller than the initial correction output amount when the number of times of the time deterioration correction is a second number that is greater than the first number.

8. an acquisition unit that acquires a target luminance set as a luminance for causing a light emitting element used in the information display device to emit light based on a user's input, or a target output amount that can be converted into the target luminance; an initial correction output amount determination unit that determines an output amount greater than the output amount corresponding to the target luminance as an initial correction output amount of the light-emitting element at the start of operation, the correction output amount being used in an information processing device that performs, at least once after the start of operation of the light-emitting element, aging deterioration correction that makes an output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance associated with aging deterioration of the light-emitting element due to the passage of the operation time, based on an inverse of an aging deterioration rate of the light-emitting element corresponding to an operation time after the start of operation of the light-emitting element at a correction timing; An information processing device comprising:

9. a display step of displaying information by emitting light from a plurality of light emitting elements; an acquisition step of acquiring a target luminance set as a luminance for causing the light emitting element to emit light or a target output amount convertible to the target luminance based on a user's input; a light-emitting control unit that performs, after the start of operation of the light-emitting element, time-dependent deterioration correction at least once based on an inverse of a time-dependent deterioration rate of the light-emitting element corresponding to an operation time after the start of operation of the light-emitting element at a correction timing, to make an output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance accompanying the time-dependent deterioration of the light-emitting element due to the passage of the operation time, and a light-emitting control step that causes the light-emitting element to emit light at an initial correction output amount higher than the output amount corresponding to the target luminance at the start of operation of the light-emitting element; A method for displaying information, comprising:

10. an acquisition step of acquiring a target luminance or a target output amount convertible to the target luminance, the target luminance being set as a luminance for causing a light-emitting element used in the information display device to emit light based on a user's input; an initial correction output amount determination step of determining a correction output amount used in an information processing device that performs, at least once after the start of operation of the light-emitting element, a time deterioration correction for making an output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance accompanying the time deterioration of the light-emitting element due to the passage of the operation time, based on an inverse of a time deterioration rate of the light-emitting element corresponding to an operation time after the start of operation of the light-emitting element at a correction timing, the output amount being greater than the output amount corresponding to the target luminance, as an initial correction output amount of the light-emitting element at the start of operation; An information processing method comprising:

11. Computer, an acquisition unit that acquires a target luminance set as a luminance for causing a light emitting element to emit light or a target output amount that can be converted into the target luminance based on a user input; a light-emitting control unit that performs, at least once after the start of operation of the light-emitting element, a time-deterioration correction for making an output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance accompanying the time-deterioration of the light-emitting element due to the passage of the operation time, based on an inverse of a time-deterioration rate of the light-emitting element corresponding to an operation time after the start of operation of the light-emitting element at a correction timing, and causes the light-emitting element to emit light at an initial correction output amount higher than the output amount corresponding to the target luminance at the start of the operation of the light-emitting element. An information display program to function as a

12. Computer, an acquisition unit that acquires a target luminance set as a luminance for causing a light-emitting element used in the information display device to emit light or a target output amount that can be converted into the target luminance based on an input from a user; an initial correction output amount determination unit that determines, as an initial correction output amount of the light-emitting element at the start of operation, an output amount greater than the output amount corresponding to the target luminance, as a correction output amount used in an information processing device that performs, at least once after the start of operation of the light-emitting element, aging deterioration correction for making an output amount of the light-emitting element higher than an output amount determined from the target luminance in order to compensate for a decrease in luminance accompanying aging deterioration of the light-emitting element due to the passage of the operation time, based on an inverse of an aging deterioration rate of the light-emitting element corresponding to an operation time after the start of operation of the light-emitting element at a correction timing; An information processing program that functions as a

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