JP2011203314A - Method of estimating image display section temperature distribution, device for estimating image display section temperature distribution, image display device, program, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of estimating an image display section temperature distribution for an image display section configured by arranging a plurality of pixels composed of light emitting elements that deteriorate according to heat generation states, and reduce brightness.SOLUTION: In the method of estimating the temperature distribution of an image display section comprising a plurality of pixels arranged therein, on the basis of image data, temperatures of the pixels occupying the pixel region and temperatures of pixels occupying a peripheral region of the pixel region are estimated, on the basis of brightness information in image data corresponding to a pixel region composed of at least one pixel.

Description

  The present invention relates to an image display unit temperature distribution estimation method, an image display unit temperature distribution estimation device suitable for execution of the image display unit temperature distribution estimation method, an image display device including the image display unit temperature distribution estimation device, and an image display. The present invention relates to a program for executing a partial temperature distribution estimation method and a recording medium on which the program is recorded.

  In recent years, as a flat panel display device (FP display device), an organic electroluminescence display device (hereinafter, sometimes simply referred to as “organic EL display device”) has been attracting attention. At present, a liquid crystal display (LCD) dominates as an FP display, but a member such as a backlight or a polarizing plate is required instead of a self-luminous device. Therefore, there are problems such as an increase in the thickness of the FD display device and insufficient luminance. On the other hand, the organic EL display device is a self-luminous device, and does not require a member such as a backlight in principle, and has many advantages over an LCD, such as being thin and having high luminance. In particular, an active matrix organic EL display device in which a switching element is arranged in each pixel can keep current consumption low by holding each pixel in a hold-on state, and it is relatively easy to enlarge the screen and increase the definition. Because it can be done, each company is developing and is expected to become the mainstream of next-generation FP display devices.

  By the way, an organic electroluminescence element (hereinafter, simply referred to as “organic EL element”) constituting each pixel of the organic EL display device is deteriorated in accordance with an integrated amount of energized current, and luminance is lowered. There is a problem that there is a case. That is, the organic EL element belonging to the region where bright image display is performed in the image display unit has a large amount of heat generation and is easily deteriorated. Depending on the image to be displayed, there may be a difference in the degradation state in the plane of the image display unit. When an organic EL display device is used for the image display unit of a television receiver, for example, various data including reception channel information, time, character data, etc. are often displayed at the corner and lower part of the image display unit. In such a state, the deterioration is accelerated only by that portion. It is known that deterioration due to energization of the organic EL element is irreversible, and the once deteriorated organic EL element does not return to the original state.

JP 2002-351403 A JP 2008-58446 A WO06 / 046196

  In order to evaluate such deterioration of the organic EL element, Japanese Patent Laid-Open No. 2002-351403 provides a dummy pixel (dummy organic EL element) outside the display area of the image display unit. A method for evaluating the degree of deterioration of a dummy pixel by detecting a terminal voltage at the time of light emission and correcting a video signal based on the result is disclosed. However, the evaluation of the deterioration of the organic EL element based on the information on the terminal voltage of the dummy pixel (dummy organic EL element) does not necessarily correspond to the deterioration with time of the luminance of the organic EL element. Japanese Patent Application Laid-Open No. 2008-58446 and International Publication No. WO06 / 046196 disclose a technique in which a photosensor is arranged in each pixel and the emission luminance is fed back. However, these methods have a problem in that the amount of feedback varies between pixels displaying the same luminance because the photoelectric conversion efficiency of the photosensors in each pixel varies.

  Accordingly, an object of the present invention is to provide an image display unit temperature distribution estimation method for an image display unit in which a plurality of pixels each composed of a light emitting element having a property that deterioration occurs in accordance with the state of heat generation and luminance decreases. Image display unit temperature distribution estimation device suitable for execution of image display unit temperature distribution estimation method, image display device including such image display unit temperature distribution estimation device, program for executing such image display unit temperature distribution estimation method, And it is providing the recording medium which recorded the program concerned.

In order to achieve the above object, an image display unit temperature distribution estimation method according to a first aspect of the present invention is a temperature distribution estimation method for estimating a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. A method,
Based on the luminance information in the image data corresponding to the pixel area composed of at least one pixel, the temperature of the pixel occupying the pixel area and the temperature of the pixel occupying the peripheral area of the pixel area are estimated.

In order to achieve the above object, an image display unit temperature distribution estimation method according to a second aspect of the present invention is a temperature distribution estimation method for estimating a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. A method,
Based on the luminance information in the image data corresponding to the pixel area composed of at least one pixel, the temperature of the pixel occupying the pixel area and the temperature of the pixels other than the pixels occupying the pixel area are estimated.

In order to achieve the above object, an image display unit temperature distribution estimation apparatus according to a first aspect of the present invention estimates a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. A device,
Based on the luminance information in the image data corresponding to the pixel area composed of at least one pixel, the temperature of the pixel occupying the pixel area and the temperature of the pixel occupying the peripheral area of the pixel area are estimated.

In order to achieve the above object, an image display unit temperature distribution estimation device according to a second aspect of the present invention provides a temperature distribution estimation that estimates a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. A device,
Based on the luminance information in the image data corresponding to the pixel area composed of at least one pixel, the temperature of the pixel occupying the pixel area and the temperature of the pixels other than the pixels occupying the pixel area are estimated.

In order to achieve the above object, an image display device according to a first aspect of the present invention provides an image display unit temperature distribution estimation device that estimates a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. An image display device comprising:
The image display unit temperature distribution estimation device is configured to detect a temperature of a pixel occupying the pixel area and a temperature of a pixel occupying a peripheral area of the pixel area based on luminance information in image data corresponding to the pixel area including at least one pixel. Is estimated.

In order to achieve the above object, an image display device according to a second aspect of the present invention provides an image display unit temperature distribution estimation device that estimates a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. An image display device comprising:
The image display unit temperature distribution estimation device is configured to detect the temperature of a pixel that occupies the pixel area and the temperature of pixels other than the pixels that occupy the pixel area based on luminance information in image data corresponding to the pixel area that includes at least one pixel. Is estimated.

  In order to achieve the above object, a program according to the present invention provides an image corresponding to a pixel region composed of at least one pixel in order to estimate the temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. Based on the luminance information in the data, execute processing to estimate the temperature of the pixel occupying the pixel area, the temperature of the pixel occupying the peripheral area of the pixel area, or the temperature of pixels other than the pixels occupying the pixel area Let

  In order to achieve the above object, a computer-readable recording medium of the present invention is a pixel comprising at least one pixel for estimating a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data. Based on the luminance information in the image data corresponding to the area, the temperature of the pixel occupying the pixel area, the temperature of the pixel occupying the peripheral area of the pixel area, or the temperature of the pixels other than the pixels occupying the pixel area A program for executing the estimated process is recorded.

  Generally, the higher the luminance (pixel), the more heat is generated and the higher the temperature. Even if the brightness of a pixel (light emitting element) adjacent to a pixel with high brightness (light emitting element) is low, heat from the pixel (light emitting element) that generates a large amount of heat flows into the pixel (light emitting element). come. In the present invention, based on the luminance information in the image data (image signal) corresponding to the pixel area composed of at least one pixel, the temperature of the pixel occupying the pixel area and the pixels occupying the peripheral area of the pixel area Alternatively, the temperature of pixels other than the pixels occupying the pixel area is estimated. Thus, not only the temperature of the pixel occupying the pixel region is estimated based on the luminance information in the image data (image signal) corresponding to the pixel region, but also the pixels occupying the peripheral region of the pixel region or the pixels other than the pixel occupying the pixel region. Since the temperature of the pixel is estimated, the temperature distribution in the image display unit can be estimated with higher accuracy. Then, by estimating the temperature distribution in the image display unit, it is possible to estimate deterioration due to heat of the pixels (light emitting elements) constituting the image display unit, and further, the luminance of the deteriorated pixels (light emitting elements). Compensation (correction) can be performed accurately, and a high-quality, high-quality display image can be provided.

(A), (B), and (C) of FIG. 1 are images displayed on the image display unit of the image display device in Example 1, a thermographic image obtained by capturing the image by thermography, and These are figures which show the result (temperature distribution estimation result and image) which estimated temperature based on this image. FIG. 2 is a conceptual diagram of a Gaussian filter (two-dimensional Gaussian filter). FIG. 3 is a schematic partial cross-sectional view of the image display device. FIG. 4 is a conceptual diagram of the image display apparatus according to the first embodiment. FIG. 5 is a diagram schematically illustrating a pixel region and a peripheral pixel region in the second embodiment. FIG. 6 is a conceptual diagram of an image display device according to the third embodiment. FIGS. 7A, 7 </ b> B, and 7 </ b> C are schematic diagrams of an image display unit for explaining processing performed on luminance information (luminance signal) in the third embodiment. 8A and 8B are schematic diagrams of a notebook personal computer and a mobile phone, respectively.

Hereinafter, the present invention will be described based on examples with reference to the drawings. However, the present invention is not limited to the examples, and various numerical values and materials in the examples are examples. The description will be given in the following order.
1. 1. Image display unit temperature distribution estimation method, image display unit temperature distribution estimation device, image display device, program and recording medium, and general description of the present invention Example 1 (Image display unit temperature distribution estimation method, image display unit temperature distribution estimation device, image display device, program, and recording medium of the present invention)
3. Example 2 (Modification of Example 1)
4). Example 3 (modification of Example 1 and Example 2), others

[Description of Image Display Unit Temperature Distribution Estimation Method, Image Display Unit Temperature Distribution Estimation Device, Image Display Device, Program and Recording Medium of the Present Invention]
An image display unit temperature distribution estimation method according to the first aspect of the present invention, an image display unit temperature distribution estimation apparatus according to the first aspect of the present invention, an image display apparatus according to the first aspect of the present invention, In a program or a recording medium of the present invention (hereinafter, these may be collectively referred to as “the present invention according to the first aspect”), image data corresponding to a plurality of pixel areas Is used to estimate the temperature of the pixel occupying each of the plurality of pixel regions and the temperature of the pixel occupying each peripheral region of the plurality of pixel regions (the image according to the first aspect of the present invention). Display portion temperature distribution estimation method, image display portion temperature distribution estimation device according to the first aspect of the present invention, program of the present invention, or recording medium of the present invention), or image display portion temperature distribution estimation device In multiple pixel areas Based on the luminance information in the corresponding image data, the temperature of the pixel occupying each of the plurality of pixel regions and the temperature of the pixel occupying each peripheral region of the plurality of pixel regions are estimated (first of the present invention) An image display device according to an aspect) may be employed. And in these forms, based on the luminance information in the image data corresponding to the plurality of pixel regions, the temperature of the pixel occupying each of the plurality of pixel regions, and the respective peripheral regions of the plurality of pixel regions Further, the temperature of the pixels occupying the plurality of pixel regions and the peripheral region can be estimated based on a convolution function.

  Alternatively, the image display unit temperature distribution estimation method according to the second aspect of the present invention, the image display unit temperature distribution estimation device according to the second aspect of the present invention, the image display device according to the second aspect of the present invention, The program of the present invention or the recording medium of the present invention (hereinafter, these may be collectively referred to simply as “the present invention according to the second aspect”) correspond to a plurality of pixel areas. The temperature of the pixels occupying each of the plurality of pixel regions and the temperature of the pixels other than the pixels occupying each of the plurality of pixel regions are estimated based on luminance information in the image data to be processed (second aspect of the present invention) Image display unit temperature distribution estimation method, image display unit temperature distribution estimation device according to the second aspect of the present invention, program of the present invention, or recording medium of the present invention), or image display unit temperature distribution Multiple estimation devices Based on the luminance information in the image data corresponding to the pixel area, the temperature of the pixel occupying each of the plurality of pixel areas and the temperature of the pixels other than the pixels occupying each of the plurality of pixel areas are estimated (in the present invention). The image display device according to the second aspect) may be employed. And in these forms, based on the luminance information in the image data corresponding to the plurality of pixel areas, the temperature of the pixels occupying each of the plurality of pixel areas and the pixels occupying each of the plurality of pixel areas The temperature of other pixels can be estimated, and the temperature of the pixels occupying the plurality of pixel regions and the other pixels can be estimated based on a convolution function.

  In the present invention according to the first aspect including the preferred form and configuration described above, based on the luminance information and the temperature distribution estimation function in the image data corresponding to the pixel area, the temperature of the pixel occupying the pixel area, and In the present invention according to the second aspect including the preferred mode and configuration described above, in the image data corresponding to the pixel region, the temperature of the pixel occupying the peripheral region of the pixel region can be estimated. Based on the luminance information and the temperature distribution estimation function, the temperature of the pixels occupying the pixel region and the temperature of pixels other than the pixels occupying the peripheral region of the pixel region can be estimated. The pixel temperature is estimated based on the luminance information and the temperature distribution estimation function. Specifically, the pixel temperature is estimated by applying (calculating) the temperature distribution estimation function to the luminance signal. In these cases, the temperature distribution estimation function is obtained in advance based on the temperature distribution measurement result of the object (subject) and the image data obtained by photographing the object (subject). Can do. The temperature distribution measurement of the object (subject) may be performed using, for example, a known thermography. In these cases, the temperature distribution estimation function is a well-known Gaussian filter (two-dimensional Gaussian filter), some kind of appropriate image blurring (mosaic) filter, or a function obtained by actual measurement. It can be configured.

  The temperature distribution estimation function may be stored, for example, in the image display unit temperature distribution estimation device, and the temperature distribution measurement result of the object and the image data obtained by photographing the object Various parameters of the temperature distribution estimation function may be determined so that a good correlation can be obtained. The temperature distribution estimation function changes depending on the luminance (maximum luminance or average luminance) of the pixel region composed of at least one pixel and / or changes depending on the size (area) of the pixel region. Further, the temperature distribution estimation function may change depending on the structure of the image display unit and the image display position in the image display unit. Specifically, for example, the temperature distribution estimation function may be changed between a portion where heat is likely to be trapped and a portion where heat is easily radiated in the image display unit. Here, the temperature distribution estimation function may be obtained once, for example, at the time of manufacturing the image display device, or corresponds to the model of the image display device depending on the specifications of the image display device. Thus, a predetermined temperature distribution estimation function may be given.

  Hereinafter, the “pixel region including at least one pixel” in the present invention according to the first aspect or the second aspect may be simply referred to as “pixel area”. Further, the pixels that occupy the peripheral area of the pixel area in the present invention according to the first aspect and the pixels other than the pixels that occupy the pixel area in the present invention according to the second aspect are collectively referred to as “peripheral pixels” hereinafter. Sometimes called. Furthermore, the peripheral region of the pixel region and the region occupied by pixels other than the pixel occupying the pixel region may be collectively referred to as “peripheral pixel region” hereinafter.

  In the present invention, the image data input to the image display unit may be image data having a known configuration and structure, and the luminance information can be obtained from the image data based on a known method. The pixel area is composed of at least one pixel or a pixel unit described later. Specifically, the pixel area may be composed of one pixel. For example, m × n (m and n are 2). These are natural numbers, for example, 3 × 3, 6 × 6, 9 × 9, etc.), or composed of a set of continuous pixels having luminance data greater than or equal to a predetermined luminance data value May be. Specifically, the temperature distribution of the image display unit is a pixel (more specifically, a pixel constituting the image display unit depending on the luminance of an image displayed on the image display unit based on the image data. Temperature distribution generated in the light emitting element). The image data corresponding to the pixel area means image data input to the pixels included in the pixel area.

  The number of peripheral pixels is plural, and may be appropriately determined depending on the size (M × N) of the image display unit, or may be a value of (M / m, N / n). Depending on the luminance (or average luminance, represented by the symbol LM) of the pixel area is “1”, a certain ratio (for example, 0.7 × LM, 0 .8 × LM, etc.) the area where the pixel on which the image should be displayed occupies the outer edge may be set as the peripheral pixel area, or may be determined each time based on the temperature distribution estimation function, These may be combined. In the preferred embodiment of the present invention according to the first aspect or the second aspect, the temperature of the surrounding pixels is estimated based on the luminance information in the image data corresponding to the plurality of pixel regions. A plurality of pixel regions means two or more pixel regions and refers to a set of pixel regions in which peripheral pixel regions overlap. Furthermore, the overall temperature of the pixels occupying the pixel region and the peripheral pixel region is estimated based on the convolution function, but the convolution function itself may be a known convolution function.

  Specifically, the image display unit temperature distribution estimation device according to the first aspect or the second aspect of the present invention may be configured as an independent circuit configuration, but the first aspect or the second aspect of the present invention may be employed. For example, a configuration and a structure included in a control circuit that controls the image display apparatus according to the aspect are preferable from the viewpoint of simplifying the entire apparatus. The image display device and the control circuit for controlling the image display device itself can be a well-known image display device and a control circuit.

  In the image display unit temperature distribution estimation apparatus or the image display apparatus according to the first aspect or the second aspect of the present invention, the degree of deterioration of the pixel (specifically, heat generation) based on the estimated pixel temperature. And a luminance compensation circuit that compensates (corrects) luminance information (luminance signal) for the pixel based on the estimated degree of degradation. As the degree of deterioration, for example, an integrated amount (integrated value) related to the estimated pixel temperature can be cited. The compensation (correction) of the luminance information (luminance signal) to the pixel is preferably performed for each pixel.

  The pixel temperature estimation may be performed every image display frame, every several image display frames, or every desired time.

  In the present invention according to the first aspect or the second aspect including the preferable modes and configurations described above (hereinafter, these may be collectively referred to as “the present invention”), the pixels are self-luminous. The image display device is composed of an organic electroluminescence display device (organic EL display device), and the pixel is composed of an organic electroluminescence device (organic EL device). Can do. Note that when the image display device is a monochrome display image display device, there is one type of pixel. On the other hand, when the image display device is a color display image display device, one pixel unit is divided into three types (for example, a red light emitting pixel that emits red light, a green light emitting pixel that emits green light, and a blue light emitting pixel that emits blue light). In addition to these three types of pixels, in addition to these three types of pixels, pixels that emit white light to improve brightness, pixels that emit complementary colors to expand the color reproduction range, and color reproduction ranges It can also be composed of four or more pixels, such as a pixel that emits yellow for enlargement, and a pixel that emits yellow and cyan for expanding the color reproduction range. The pixels in these cases are also called “sub-pixels” in some cases.

  In the present invention, when the light emitting element is composed of an organic EL element, the organic layer (light emitting part) constituting the organic EL element includes a light emitting layer composed of an organic light emitting material. Laminated structure of transport layer, light emitting layer and electron transport layer, laminated structure of hole transport layer and light emitting layer which also serves as electron transport layer, hole injection layer, hole transport layer, light emitting layer, electron transport layer and electron It can be composed of a laminated structure with an injection layer. When the electron transport layer, the light emitting layer, the hole transport layer, and the hole injection layer are “tandem units”, the organic layer is formed by stacking the first tandem unit, the connection layer, and the second tandem unit. It may also have a two-stage tandem structure, and may further have a three-stage or more tandem structure in which three or more tandem units are stacked. In these cases, the emission color is red, By changing green and blue for each tandem unit, an organic layer that emits white light as a whole can be obtained.

  By optimizing the thickness of the organic layer, for example, the light emitted from the light-emitting layer is resonated between the first electrode and the second electrode, and a part of this light is transmitted to the outside via the second electrode. It can also be set as the structure which radiate | emits.

Furthermore, in the present invention including the various preferred configurations and forms described above, when the image display unit is configured from an organic EL display device, the image display unit is
(A) a first substrate;
(B) a drive circuit provided on the first substrate;
(C) an interlayer insulating layer covering the drive circuit;
(D) a light emitting section provided on the interlayer insulating layer;
(E) a protective layer provided on the light emitting part,
(F) a light shielding layer provided on the protective layer, and
(G) a second substrate covering the protective layer and the light shielding layer;
With
Each pixel can be configured to include the drive circuit and the light-emitting portion.

Here, as the first substrate or as the second substrate, a high strain point glass substrate, soda glass (Na ₂ O · CaO · SiO ₂ ) substrate, borosilicate glass (Na ₂ O · B ₂ O ₃ · SiO ₂ ). ₂ ) Substrate, forsterite (2MgO · SiO ₂ ) substrate, lead glass (Na ₂ O · PbO · SiO ₂ ) substrate, various glass substrates with insulating film formed on the surface, quartz substrate, insulating film formed on the surface Quartz substrate, silicon substrate with an insulating film formed on the surface, polymethyl methacrylate (polymethyl methacrylate, PMMA), polyvinyl alcohol (PVA), polyvinyl phenol (PVP), polyethersulfone (PES), polyimide, polycarbonate, Organic polymer exemplified by polyethylene terephthalate (PET) (with flexibility composed of polymer material) Plastic films and plastic sheets, the form of polymeric material such as a plastic substrate) may be mentioned. The drive circuit may be composed of, for example, one or a plurality of thin film transistors (TFTs). As a constituent material of the interlayer insulating _{layer, SiO 2, BPSG, PSG,} BSG, AsSG, PbSG, SiON, SOG ( spin on glass), low-melting glass, SiO ₂ based materials such glass paste; SiN-based materials; insulation, such as polyimide Resins can be used alone or in appropriate combination. When the pixel is composed of an organic EL element, the light emitting unit is as described above. As a material constituting the protective film, it is preferable to use a material that is transparent to the light emitted from the light emitting portion, is dense, and does not transmit moisture. Specifically, for example, amorphous silicon (α-Si), Amorphous silicon carbide (α-SiC), amorphous silicon nitride (α-Si _1-x N _x ), amorphous silicon oxide (α-Si _1-y O _y ), amorphous carbon (α-C), amorphous silicon oxide / silicon nitride (Α-SiON) and Al ₂ O ₃ can be mentioned. The light shielding film (black matrix) may be made of a known material. A color filter may be provided as necessary.

  The image display unit is formed by arranging a plurality of pixels or pixel units. Here, when the number of pixels or pixel units is represented by (M, N), VGA (640, 480), S-VGA (800, 600), XGA (1024, 768), APRC (1152, 900), S-XGA (1280, 1024), U-XGA (1600, 1200), HD-TV (1920, 1080), Q-XGA (2048, 1536) and some of the image display resolutions such as (1920, 1035), (720, 480), (854, 480), (1280, 960), etc., but are limited to these values. Not what you want. Examples of the pixel arrangement include a stripe arrangement, a diagonal arrangement, a delta arrangement, and a rectangle arrangement.

  The image display device of the present invention can be used, for example, as a monitor device that constitutes a personal computer, and is incorporated in a television receiver, a mobile phone, a PDA (personal digital assistant, personal digital assistant), or a game machine. It can be used as a monitoring device.

  Example 1 is an image display unit temperature distribution estimation method according to the first and second aspects of the present invention, an image display unit temperature distribution estimation device according to the first and second aspects of the present invention, The present invention relates to an image display device, a program, and a recording medium according to the first and second aspects of the invention. FIG. 3 shows a schematic partial cross-sectional view of the image display device, and FIG. 4 shows a conceptual diagram of the image display device.

  The image display unit temperature distribution estimation device 30 according to the first embodiment includes an image display unit in which a plurality of pixels are arranged [an image display unit in which a plurality of pixels 11 (11R, 11G, 11B) including light emitting elements are arranged]. Is a temperature distribution estimation device that estimates the temperature distribution of the image based on image data (input image signal). The image display device 20 according to the first embodiment is an image display device including the image display unit temperature distribution estimation device 30. Furthermore, the image display unit temperature distribution estimation method of the first embodiment is a temperature distribution estimation method for estimating the temperature distribution of the image display unit 10 in which a plurality of pixels are arranged based on image data (input image signal). Based on the luminance information (luminance signal) in the image data (input image signal) corresponding to the pixel region (pixel region 12) composed of at least one pixel 11, the temperature of the pixel 13 occupying the pixel region 12, and the pixel region The temperature of a pixel (peripheral pixel 15) occupying 12 peripheral regions (peripheral pixel region 14) or the temperature of a pixel (peripheral pixel 15) other than the pixel 13 occupying the pixel region 12 is estimated.

  In addition, the program according to the first embodiment uses the luminance information in the image data corresponding to the pixel region including at least one pixel in order to estimate the temperature distribution of the image display unit in which a plurality of pixels are arranged based on the image data. Based on this, a process for estimating the temperature of the pixel occupying the pixel area, the temperature of the pixel occupying the peripheral area of the pixel area, or the temperature of a pixel other than the pixels occupying the pixel area is executed. Furthermore, the computer-readable recording medium according to the first embodiment corresponds to a pixel region including at least one pixel in order to estimate the temperature distribution of the image display unit in which a plurality of pixels are arranged based on the image data. A process of estimating the temperature of a pixel occupying the pixel area, the temperature of a pixel occupying the peripheral area of the pixel area, or the temperature of a pixel other than the pixels occupying the pixel area based on luminance information in the image data The program to be executed is recorded. The recording medium can be composed of a known recording medium, and the program can be recorded based on a known method suitable for the recording medium.

  In Example 1 or Examples 2 to 3 to be described later, the light emitting element is a self-luminous light emitting element, specifically, an organic EL element, and the image display unit 10 is an XGA type organic color display. It consists of an EL display device. That is, when the number of pixel units is represented by (M, N), it is (1024, 768). One pixel unit is composed of three pixels: a red light emitting pixel 11R that emits red light, a green light emitting pixel 11G that emits green light, and a blue light emitting pixel 11B that emits blue light. In Example 1 or Examples 2 to 3 to be described later, the image display device 20 includes a scanning line control circuit 21 that controls (drives) each scanning line 22 and a pixel ( A signal line control circuit 23 for supplying image data and luminance information (image signal and luminance signal) to the light emitting element 11) is provided. The operations of the scanning line control circuit 21 and the signal line control circuit 23 are controlled by the control circuit 25. The image display unit temperature distribution estimation device 30 is included in the control circuit 25. The image display device 20, the control circuit 25 that controls the image display device 20, the scanning line control circuit 21, and the signal line control circuit 23 itself are known image display devices, control circuits, scanning line control circuits, and signal line controls. Since it can be a circuit, detailed description is omitted.

In Example 1 or Example 2 to Example 3 described later, specifically, as shown in FIG.
(A) the first substrate 40,
(B) a drive circuit provided on the first substrate 40;
(C) an interlayer insulating layer 41 covering the drive circuit;
(D) a light emitting part (organic layer 63) provided on the interlayer insulating layer 41;
(E) a protective layer 64 provided on the light emitting portion (organic layer 63);
(F) a light shielding layer 65 provided on the protective layer 64, and
(G) a second substrate 67 covering the protective layer 64 and the light shielding layer 65;
It has.

More specifically, a drive circuit is provided on the first substrate 40 made of soda glass. The drive circuit is composed of a plurality of TFTs. The TFT includes a gate electrode 51 formed on the first substrate 40, a gate insulating film 52 formed on the first substrate 40 and the gate electrode 51, and a source provided on a semiconductor layer formed on the gate insulating film 52. The portion of the semiconductor layer located between the source / drain region 53 and the source / drain region 53 and above the gate electrode 51 is composed of a corresponding channel forming region 54. In the illustrated example, the TFT is a bottom gate type, but may be a top gate type. The gate electrode 51 of the TFT is connected to a scanning line (not shown in FIG. 4). The interlayer insulating layer 41 (41A, 41B) covers the first substrate 40 and the drive circuit. The first electrode 61 constituting the organic EL element, SiO _X and SiN _Y, is provided on the interlayer insulating layer 41B made of polyimide resin or the like. The TFT and the first electrode 61 are electrically connected via a contact plug 42, a wiring 43, and a contact plug 44 provided in the interlayer insulating layer 41A. In the drawing, one TFT is shown for one organic EL element driving unit.

On the interlayer insulating layer 41, an insulating layer 45 having an opening 46 and having the first electrode 61 exposed at the bottom of the opening 46 is formed. The insulating layer 45 is excellent in flatness, and is made of an insulating material having a low water absorption rate, specifically, a polyimide resin in order to prevent the organic layer 63 from being deteriorated by moisture and maintain the light emission luminance. An organic layer 63 having a light emitting layer made of an organic light emitting material is formed over the portion of the insulating layer 45 surrounding the opening 46 from above the portion of the first electrode 61 exposed at the bottom of the opening 46. The organic layer 63 is composed of, for example, a stacked structure of a light-emitting layer that also serves as a hole transport layer and an electron transport layer, but is represented by one layer in the drawing. An insulating protective layer 64 made of amorphous silicon nitride (α-Si _1-x N _x ) is provided on the second electrode 62 based on the plasma CVD method for the purpose of preventing moisture from reaching the organic layer 63. It has been. A light shielding layer 65 made of black polyimide resin is formed on the protective layer 64, and a second substrate 67 made of soda glass is disposed on the protective layer 64 and the light shielding layer 65. The protective layer 64 and the light shielding layer 65 are bonded to the second substrate 67 by an adhesive layer 66 made of an acrylic adhesive. The first electrode 61 is used as an anode electrode, and the second electrode 62 is used as a cathode electrode. Specifically, the first electrode 61 is made of a light reflecting material made of aluminum (Al), silver (Ag), or an alloy thereof having a thickness of 0.2 μm to 0.5 μm, and the second electrode 62. Is made of a transparent conductive material such as ITO or IZO having a thickness of 0.1 μm, or a metal thin film (semi-transparent metal thin film) having a thickness of about 5 nm such as silver (Ag) or magnesium (Mg). . The second electrode 62 is not patterned and is formed in a single sheet. In some cases, an electron injection layer (not shown) made of LiF having a thickness of 0.3 nm may be formed between the organic layer 63 and the second electrode 62.

  In summary, the detailed configuration of the light-emitting elements of Example 1 or Examples 2 to 3 described later is as shown in Table 1 below.

[Table 1]
Second substrate 67: Soda glass adhesive layer 66: Acrylic adhesive light shielding layer 65: Black polyimide resin protective layer 64: SiN _x layer (thickness: 5 μm)
Second electrode (cathode electrode) 62: ITO layer (thickness: 0.1 μm) or semitransparent metal thin film electron injection layer: LiF layer (thickness: 0.3 nm)
Organic layer 63: As described above, first electrode (anode electrode) 61: Al—Nd layer (thickness: 0.2 μm)
Interlayer insulating layer 41: SiO ₂ layer TFT: constituting drive circuit First substrate 40: soda glass

  In the first embodiment, the image data input to the image display unit 10 is, for example, a video signal in a television broadcast transmitted from a broadcasting station, and the luminance information (luminance signal Y) is based on a known method. It can be obtained from the data. The pixel area 12 includes at least one pixel. Specifically, the pixel area 12 has luminance data equal to or higher than a predetermined luminance data value (for example, a luminance data value that is 50% of the maximum luminance value). It consists of a set of continuous pixels. The number of peripheral pixels 15 is plural, and is determined for each image display frame based on the temperature distribution estimation function (temperature distribution filter). The temperature estimation of the pixels 13 and 15 is performed for each image display frame.

  Here, the temperature distribution of the image display unit 10 specifically refers to the pixels (more specifically, the image display unit 10) depending on the luminance of the image displayed on the image display unit 10 based on the image data. Is a temperature distribution generated in the light emitting element 11) constituting the pixel. The higher the image brightness, the more current flows through the light emitting element, and the temperature of the light emitting element increases.

  In the first embodiment, the temperature of the pixel 13 occupying the pixel region 12 and the temperature of the surrounding pixels 15 are estimated based on the luminance information and the temperature distribution estimation function in the image data corresponding to the pixel region 12. Specifically, the temperature of the pixels 13 and 15 is estimated by applying (calculating) a temperature distribution estimation function to the luminance signal Y. A temperature distribution estimation function is obtained in advance based on the temperature distribution measurement result of the object (subject) and image data obtained by photographing the object (subject). Here, the temperature distribution measurement of the object may be performed using, for example, a known thermography. Further, the temperature distribution estimation function (temperature distribution filter) includes a known Gaussian filter (two-dimensional Gaussian filter) whose conceptual diagram is shown in FIG. The object (subject) is arbitrary, and an appropriate object may be selected. The temperature distribution estimation function may be stored in the image display unit temperature distribution estimation device 30, and may be between the temperature distribution measurement result of the object and the image data obtained by photographing the object. Various parameters of the temperature distribution estimation function are determined so that correlation can be obtained. Further, the temperature distribution estimation function changes depending on the luminance (for example, the maximum luminance) of the pixel region 12 and / or changes depending on the size (area) of the pixel region 12. Further, it varies depending on the structure of the image display unit 10 and the display position of the image on the image display unit 10.

Since the number of pixel units is (M, N), the number of pixels is (3M, N). Here, the (i, j) -th pixel Px _i, based on the luminance information in the image data corresponding to a pixel region consisting of _j, the pixel Px _i, the temperature of the _j occupying the pixel region and the peripheral region of the pixel region Is estimated. Note that the amount of heat generated by the pixel Px _{i, j} is Q _{i, j} . Further, let f _{i, j} (x, y) be a temperature distribution estimation function for obtaining the ambient temperature distribution based on one heat source. As described above, the temperature distribution estimation function f _{i, j} (x, y) may be a well-known Gaussian filter (two-dimensional Gaussian filter) or may be obtained by actual measurement. If the temperature distribution of the surrounding pixels based on the calorific value Q _{i, j} is D _{i, j} (x, y), D _{i, j} (x, y) can be expressed by the following equation (A), for example. Can do.

D _{i, j} (x, y) = Q _{i, j} · f _{i, j} (xi, y−j) (A)

In the second embodiment described below, the temperature of the pixel 13 occupying each of the plurality of pixel regions 12 and the plurality of pixel regions based on the luminance information in the image data corresponding to the plurality of pixel regions 12. Since the temperature of the pixel (peripheral pixel 15) occupying each of the 12 peripheral regions or the temperature of the pixel (peripheral pixel 15) other than the pixel 13 occupying each of the plurality of pixel regions 12 is estimated, the above equation ( There are as many (i, j) of A) as the number of pixel regions 12. Therefore, D _{i, j} (x, y) is obtained as many as the number of pixel areas 12, and a plurality of pixel areas 12 and peripheral pixel areas 14 are determined from these D _{i, j} (x, y) and the convolution function. What is necessary is just to estimate the temperature of the whole pixel 13 and 15 to occupy.

  The image shown in FIG. 1A is displayed on the image display unit 10 of the image display device 20. A thermographic image obtained by imaging this image by thermography is shown in FIG. Further, based on this image, based on the luminance information and the temperature distribution estimation function in the image data corresponding to the pixel area 12, the temperature of the pixel 13 occupying the pixel area 12 and the temperature of the surrounding pixels 15 are estimated (temperature distribution estimation). For the sake of convenience, the result of displaying the (result / image) on the image display unit of the image display device is shown in FIG. It can be seen that the thermographic image (see FIG. 1B) and the temperature distribution estimation result / image (see FIG. 1C) are in good agreement.

  Generally, the higher the luminance (pixel), the more heat is generated and the higher the temperature. And even if the brightness of the pixels (light emitting elements) around the high brightness pixels (light emitting elements) is low, heat from the pixels (light emitting elements) that generate a large amount of heat flows into the surrounding pixels (light emitting elements). Come. In the first embodiment, the temperature of the pixel 13 occupying the pixel region 12 and the temperature of the surrounding pixels 15 are estimated based on the luminance information in the image data corresponding to the pixel region 12. Thus, not only the temperature of the pixel 13 occupying the pixel area 12 but also the temperature of the peripheral pixel 15 is estimated, so that the temperature distribution in the image display unit 10 can be estimated with higher accuracy.

  The second embodiment is a modification of the first embodiment. In the second embodiment, the temperature of the pixel 13 occupying each of the plurality of pixel regions 12 and the peripheral region of each of the plurality of pixel regions 12 based on the luminance information in the image data corresponding to the plurality of pixel regions 12. Or the temperature of pixels (peripheral pixels 15) other than the pixels 13 occupying each of the plurality of pixel regions 12 is estimated. Furthermore, the temperature of the pixel 13 occupying each of the plurality of pixel regions 12 and the temperature of the surrounding pixels 15 are estimated based on the luminance information in the image data corresponding to the plurality of pixel regions 12, and a well-known convolution function is used. Based on the above, the overall temperatures of the pixels 13 and 15 occupying the plurality of pixel regions 12 and the peripheral pixel region 14 are estimated. The plurality of pixel regions 12 means two or more pixel regions 12 and indicates a set of pixel regions 12 in which peripheral pixel regions 14 overlap.

  Also in the second embodiment, the image data input to the image display unit 10 is, for example, a video signal in a television broadcast transmitted from a broadcasting station, and the luminance information (luminance signal Y) is based on a known method. It can be obtained from image data. The pixel area 12 is composed of at least one pixel. Specifically, the pixel area 12 is configured by a set of continuous pixels having luminance data equal to or higher than a predetermined luminance data value as in the first embodiment. To do. The number of peripheral pixels 15 is plural, and is determined for each image display frame based on the temperature distribution estimation function. The temperature estimation of the pixels 13 and 15 is performed for each image display frame. As schematically shown in FIG. 5, when a peripheral pixel area 14A of a certain pixel area 12A overlaps with a peripheral pixel area 14B of a pixel area 12B adjacent to the certain pixel area 12A, a plurality of pixel areas 12A , 12B, the entire temperatures of the pixels 13, 15 occupying the plurality of pixel regions 12A, 12B and the peripheral pixel regions 14A, 14B (the peripheral pixel region 14 of the union of the peripheral pixel region 14A and the peripheral pixel region 14B). Is estimated based on a known convolution function. As described above, the entire temperature of the pixels 13 and 15 occupying the plurality of pixel regions 12A and 12B and the peripheral pixel regions 14A and 14B is estimated based on a known convolution function. Therefore, it is possible to estimate the temperature distribution with higher accuracy.

  The third embodiment is a modification of the first and second embodiments. In the third embodiment, the degree of deterioration of the pixel (specifically, the degree of deterioration of the light emitting element due to heat generation) is estimated based on the estimated temperature of the pixels 13 and 15, and based on the estimated degree of deterioration. The image display unit temperature distribution estimation device 30 includes a luminance compensation circuit that compensates (corrects) the luminance of the pixels. Here, as the degree of deterioration, an integrated amount (integrated value) based on the estimated pixel temperature can be cited. Compensation (correction) of pixel luminance is performed for each pixel.

  FIG. 6 is a conceptual diagram of an image display device according to the third embodiment. The luminance compensation circuit includes an integration calculation circuit 31 and a deterioration calculation circuit 32.

  In the third embodiment, the estimated temperature value in each pixel obtained by the image display unit temperature distribution estimation device 30 based on the first embodiment or the second embodiment is input to the integration calculation circuit 31, and the integration relating to the estimated temperature value is performed. A value is determined. Note that the estimated temperature value in the pixels other than the pixels 13 and 15 may be a predetermined value (a constant value). On the other hand, the degradation calculation circuit 32 stores a luminance signal correction coefficient based on a luminance degradation curve using the integrated value related to the estimated temperature value as a parameter. Then, the integration calculation circuit 31 calculates a signal correction amount in each pixel from the luminance signal correction coefficient based on the integration value related to the temperature estimation value and the input image data (image signal), and the input image signal (input video signal). A luminance correction signal obtained by correcting the above is sent to the signal line control circuit 23 via the control circuit 25 and further sent to the pixels.

  Such a process is shown in the conceptual diagram of FIG. FIG. 7B schematically shows a state in which the temperature distribution is estimated in the display image schematically shown in FIG. In this state, in the pixel region surrounded by the small square and the peripheral pixel region, the temperature of the pixel located at the center of the small square (referred to as “pixel A” for convenience) is high, and as it approaches the periphery, The pixel temperature is lowered. When such a display state continues for a long time, deterioration due to the temperature of the pixel A (light emitting element) located in the center of the small square is caused by the temperature of the pixel (light emitting element) located in the periphery (referred to as “pixel B” for convenience). It becomes more severe than deterioration due to temperature. Therefore, even if the luminance information (luminance signal Y) having the same value is input to the pixel, the pixel A is darker than the pixel B. Therefore, the luminance compensation circuit calculates the signal correction amount and makes the value of the luminance signal sent to the pixel A higher than the value of the luminance signal sent to the pixel B (see FIG. 7C). Thereby, the pixel A and the pixel B can display an image having the same luminance.

  Thus, in Example 3, it is possible to estimate deterioration due to heat of the pixels (light emitting elements) constituting the image display unit 10 by estimating the temperature distribution in the image display unit 10, and further, Makes it possible to accurately compensate (correct) the luminance of a deteriorated pixel (light emitting element), and to provide a high-quality and high-quality display image.

  As mentioned above, although this invention was demonstrated based on the preferable Example, this invention is not limited to these Examples. The configuration and structure of the image display apparatus described in the embodiments are examples and can be changed as appropriate. The image display device of the present invention can be used as a monitor device incorporated in a notebook personal computer (see FIG. 8A), a cellular phone (see FIG. 8B), a PDA, a game, or the like. It can be used as a monitor device incorporated in equipment or a television receiver.

DESCRIPTION OF SYMBOLS 10 ... Image display part, 11, 11R, 11G, 11B ... Pixel, 12, 12A, 12B ... Pixel region, 13 ... Pixel occupying pixel region, 14, 14A, 14B ... Periphery Pixel region, 15 ... peripheral pixels, 20 ... image display device, 21 ... scanning line control circuit, 22 ... scanning line, 23 ... signal line control circuit, 24 ... signal line, DESCRIPTION OF SYMBOLS 25 ... Control circuit, 30 ... Image display part temperature distribution estimation apparatus, 31 ... Integration calculation circuit, 32 ... Degradation calculation circuit, 40 ... 1st board | substrate, 41 ... Interlayer insulation layer , 42, 44 ... contact plug, 43 ... wiring, 45 ... insulating layer, 46 ... opening, 51 ... gate electrode, 52 ... gate insulating film, 53 ... source / Drain region, 54... Channel forming region, 61... First electrode, 62. · Second electrode, 63 ... organic layer, 64 ... protective layer, 65 ... light shielding layer, 66 ... adhesive layer, 67 ... second substrate

Claims (20)

An image display unit temperature distribution estimation method for estimating a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data,
Image display unit temperature distribution estimation that estimates the temperature of the pixel occupying the pixel area and the temperature of the pixel occupying the peripheral area of the pixel area based on luminance information in the image data corresponding to the pixel area composed of at least one pixel Method.   The temperature of a pixel occupying each of the plurality of pixel areas and a temperature of a pixel occupying each peripheral area of the plurality of pixel areas are estimated based on luminance information in image data corresponding to the plurality of pixel areas. The image display unit temperature distribution estimation method according to claim 1.   Based on the luminance information in the image data corresponding to the plurality of pixel regions, the temperature of the pixels occupying each of the plurality of pixel regions and the temperature of the pixels occupying each peripheral region of the plurality of pixel regions are estimated, and The image display unit temperature distribution estimation method according to claim 2, wherein the overall temperature of the pixels occupying the plurality of pixel regions and the peripheral region is estimated based on a convolution function.   The temperature of a pixel occupying the pixel area and the temperature of a pixel occupying a peripheral area of the pixel area are estimated based on luminance information and a temperature distribution estimation function in image data corresponding to the pixel area. 4. The image display unit temperature distribution estimation method according to any one of 3 above. An image display unit temperature distribution estimation method for estimating a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data,
Image display unit temperature distribution estimation that estimates the temperature of a pixel that occupies the pixel area and the temperature of a pixel other than the pixel that occupies the pixel area, based on luminance information in image data corresponding to the pixel area composed of at least one pixel Method.   A temperature of a pixel that occupies each of the plurality of pixel areas and a temperature of a pixel other than the pixel that occupies each of the plurality of pixel areas are estimated based on luminance information in image data corresponding to the plurality of pixel areas. 5. The image display unit temperature distribution estimation method according to 5.   Based on the luminance information in the image data corresponding to the plurality of pixel regions, the temperature of the pixels occupying each of the plurality of pixel regions and the temperature of the pixels other than the pixels occupying each of the plurality of pixel regions are estimated, and The image display unit temperature distribution estimation method according to claim 6, wherein the temperatures of the pixels occupying the plurality of pixel regions and the other pixels are estimated based on a convolution function.   6. The temperature of a pixel that occupies the pixel area and a temperature of a pixel other than the pixels that occupy the peripheral area of the pixel area are estimated based on luminance information and a temperature distribution estimation function in image data corresponding to the pixel area. The image display part temperature distribution estimation method of any one of thru | or 7 thru | or 7.   The image display unit according to claim 4 or 8, wherein a temperature distribution estimation function is obtained in advance based on a temperature distribution measurement result of the object and image data obtained by photographing the object. Temperature distribution estimation method.   The image display unit temperature distribution estimation method according to claim 4 or 8, wherein the temperature distribution estimation function includes a Gaussian filter. An image display unit temperature distribution estimation device for estimating a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data,
Image display unit temperature distribution estimation that estimates the temperature of the pixel occupying the pixel area and the temperature of the pixel occupying the peripheral area of the pixel area based on luminance information in the image data corresponding to the pixel area composed of at least one pixel apparatus.   The temperature of a pixel occupying each of the plurality of pixel areas and a temperature of a pixel occupying each peripheral area of the plurality of pixel areas are estimated based on luminance information in image data corresponding to the plurality of pixel areas. 11. The image display unit temperature distribution estimation device according to 11. An image display unit temperature distribution estimation device for estimating a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data,
Image display unit temperature distribution estimation that estimates the temperature of a pixel that occupies the pixel area and the temperature of a pixel other than the pixel that occupies the pixel area, based on luminance information in image data corresponding to the pixel area composed of at least one pixel apparatus.   A temperature of a pixel that occupies each of the plurality of pixel areas and a temperature of a pixel other than the pixel that occupies each of the plurality of pixel areas are estimated based on luminance information in image data corresponding to the plurality of pixel areas. The image display part temperature distribution estimation apparatus of Claim 13. An image display device provided with an image display unit temperature distribution estimation device that estimates a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data,
The image display unit temperature distribution estimation device is configured to detect a temperature of a pixel occupying the pixel area and a temperature of a pixel occupying a peripheral area of the pixel area based on luminance information in image data corresponding to the pixel area including at least one pixel. Display device for estimating   The image display unit temperature distribution estimation device calculates a temperature of a pixel occupying each of the plurality of pixel regions and a peripheral region of each of the plurality of pixel regions based on luminance information in image data corresponding to the plurality of pixel regions. The image display device according to claim 15, wherein the temperature of the occupied pixel is estimated. An image display device provided with an image display unit temperature distribution estimation device that estimates a temperature distribution of an image display unit in which a plurality of pixels are arranged based on image data,
The image display unit temperature distribution estimation device is configured to detect the temperature of a pixel that occupies the pixel area and the temperature of pixels other than the pixels that occupy the pixel area based on luminance information in image data corresponding to the pixel area that includes at least one pixel. Display device for estimating   The image display unit temperature distribution estimation device is based on luminance information in image data corresponding to a plurality of pixel areas, and the temperature of the pixels occupying each of the plurality of pixel areas and the pixels other than the pixels occupying each of the plurality of pixel areas The image display device according to claim 17, wherein the temperature of the pixel is estimated.   In order to estimate the temperature distribution of the image display unit in which a plurality of pixels are arranged based on the image data, based on the luminance information in the image data corresponding to the pixel area composed of at least one pixel, the pixels occupying the pixel area A program for executing a process of estimating the temperature and the temperature of a pixel occupying a peripheral region of the pixel region or the temperature of a pixel other than the pixel occupying the pixel region.   In order to estimate the temperature distribution of the image display unit in which a plurality of pixels are arranged based on the image data, based on the luminance information in the image data corresponding to the pixel area composed of at least one pixel, the pixels occupying the pixel area A computer-readable recording medium storing a program for executing processing for estimating temperature and temperature of a pixel occupying a peripheral region of the pixel region or temperature of a pixel other than the pixel occupying the pixel region.