JP2008158400A - Driving condition controlling device, self-luminous display device, electronic equipment, driving condition controlling method and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving condition controlling device, a self-luminous display device, an electronic equipment, a driving condition controlling method and a computer program that can further raise the impression of a user by enhancing the display of a logo or the like which is gradually brightened upon starting an equipment or used in an opening screen of contents or the like. <P>SOLUTION: The driving condition controlling device of an active matrix driving type self-luminous display module includes: (a) a monitoring section that monitors transition of grayscale information; and (b) a controlling section for enhancement operation, which controls the driving conditions so as to increase a peak brightness level linked with an increase in the maximum grayscale value upon detecting an enhanced screen with continuous increase in the maximum grayscale value in a frame screen. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The invention described in this specification relates to a drive control technique of an active matrix drive type self-luminous display module. Note that the present invention has aspects as a drive condition control device, a self-luminous display device, an electronic device, a drive condition control method, and a computer program.

  Currently, many flat-type liquid crystal displays are used in many electronic devices. The liquid crystal display can change the screen brightness by controlling the brightness of the backlight. However, in the case of a liquid crystal display, it is generally difficult to control brightness at a high speed corresponding to the frame frequency.

Currently, the following brightness control techniques are being studied.
Japanese Patent Laid-Open No. 8-320679 discloses a variable brightness technique for improving the quality of a display area selected according to display contents (images having different properties such as PC work and moving image display). . That is, a mechanism is disclosed in which different display luminances are applied to the inside and outside of the selected region.

  However, the disclosed brightness variable technique cannot variably control display brightness in units of frames. Also, there is no disclosure of a mechanism for variably controlling the brightness of the entire display area only when inputting specific display contents.

JP 2004-309937 A JP-A-2005-521904 discloses a display technique for improving the optical contrast ratio by increasing the luminance of the backlight and lowering the video signal level in an area that is not to be highlighted. Has been.

  Also in these patent documents, display luminance cannot be variably controlled in units of frames. Also, there is no disclosure of a mechanism for variably controlling the brightness of the entire display area only when inputting specific display contents.

Japanese Patent Laid-Open No. 2004-172879 discloses a mechanism for processing image data so as to emphasize a region set at the time of imaging according to the state of a subject image or user designation. However, with this processing technique, the luminance level can be varied only within a range that can be varied by image processing.

  Therefore, the inventor has (a) a gradation transition monitoring unit that monitors transition of gradation information and (b) a maximum gradation value of a frame screen as a driving condition control device for an active matrix driving type self-luminous display module. An enhancement operation control unit is proposed that controls a driving condition so as to increase the peak luminance level in conjunction with the increase in the maximum gradation value when detecting an enhancement screen in which the image continuously increases.

  Further, the inventor as an active matrix driving type self-luminous display module driving condition control device, (a) a gradation transition monitoring unit that monitors transition of gradation information based on application information input from the outside; (B) an enhancement operation control unit that controls a driving condition so as to increase a peak luminance level in conjunction with an increase in the maximum gradation value when detecting an enhancement screen in which the maximum gradation value of the frame screen continuously increases; We propose something with

  In the case of the invention proposed by the inventor, it is possible to emphasize the display of a logo or the like that gradually increases in brightness when the device is started up or on the opening screen of the content, thereby further enhancing the impression of the user.

Hereinafter, an example of drive control suitable when the invention is applied to an active matrix drive type organic EL display device (self-luminous display device) will be described.
In addition, the well-known or well-known technique of the said technical field is applied to the part which is not illustrated or described in particular in this specification.
Moreover, the form example demonstrated below is one form example of invention, Comprising: It is not limited to these.

(A) Form example 1
(A-1) Functional Configuration of Organic EL Display Device FIG. 1 shows a functional configuration of the organic EL display device 1. The organic EL display device 1 includes an organic EL panel module 3 and a drive condition control unit 5.

The organic EL panel module 3 includes an organic EL panel 11 in which pixels are arranged in a matrix according to the panel resolution and a driver IC block 13.
Among these, the organic EL panel 11 is for color display, and the pixels are arranged according to emission colors.

  However, when the pixel is an organic EL element having a structure in which a plurality of light emitting layers are stacked, one pixel corresponds to a plurality of light emitting colors.

  FIG. 2 shows a pixel structure constituting the organic EL panel 11. The pixel 15 includes a switch element T1, a capacitor C, a current drive element T2, a duty control element T3, and an organic EL element D.

  The switch element T1 is a transistor that controls writing of the signal voltage Vin applied to the data line DL to the capacitor C. The write permission signal is supplied from the scanning line driver (driver IC block 13) through the scanning line WL.

  The capacitor C is a storage element that holds the signal voltage Vin corresponding to each pixel for one frame. By using the capacitor C, even when the signal voltage Vin is written line-sequentially, the same light emission mode as that in the case of writing by the frame sequential scanning method is realized.

  The current drive element T2 is a transistor that supplies a drive current corresponding to the signal voltage Vin held in the capacitor C to the organic EL element D. The drive current value here is determined by the voltage Vgs applied between the gate and source of the current drive element T2.

  The duty control element T3 is a transistor that controls the lighting time ratio (duty) in one frame of the organic EL element D. The duty control element T3 is connected in series to the organic EL element D, and controls the supply and stop of the drive current to the organic EL element D by on / off control.

The control signal of the duty control element T3 is supplied from the duty line control driver (driver IC block 13) through the duty control line DTL.
FIG. 3 shows the relationship between the signal waveform of the duty control signal and the lighting / non-lighting state of the organic EL element D.

  FIG. 3A shows a vertical synchronization signal that gives one frame period. FIG. 3B shows the waveform of the duty control signal corresponding to the standard lighting time ratio α% set in the display module. FIG. 3C shows a waveform of the duty control signal corresponding to the lighting time ratio β% used when the brightness of a logo or the like continuously increases (when highlighted).

  In this example, since the duty control element T3 is a P-channel FET, the L level period of the duty control signal represents the lighting time, and the H level period represents the extinguishing time. The lighting time ratios α% and β% are expressed by assuming that the length of one frame period is 100%.

  Incidentally, the lighting time ratio β% at the time of highlighting is determined in the range of α% to 100% according to the maximum gradation value Dmax (n) of each frame image detected at the time of highlighting. The determination method will be described later.

In the case of the organic EL panel 11, the screen luminance is proportional to the lighting time length. Accordingly, the variable control of the lighting time length is the same as the variable control of the physical peak luminance of the display screen.
FIG. 4 shows a functional configuration of the driver IC block 13.

The driver IC block 13 includes a timing generator 31, a data line driver 33, a scanning line driver 35, and a duty line control driver 37.
Among these, the timing generator 31 is a circuit that generates a timing pulse for driving the driver.

  The data line driver 33 executes a process of applying the video signal Vin of each pixel on the scanning line to be written to the data line DL at a timing synchronized with the horizontal synchronization signal. The scanning line driver 35 executes a process of applying a write permission signal to the scanning lines line by line at a timing synchronized with the horizontal synchronization signal.

  The duty line control driver 37 executes a process of boosting the duty control signal Sd given from the drive condition control unit 5 to a voltage level suitable for driving the organic EL panel 11 and applying the boosted voltage to the duty control signal line DTL. It should be noted that the lighting time length of the duty control signal is fixed at a standard lighting time ratio α% except when highlighting is executed.

  The drive condition control unit 5 detects an emphasized screen in which a part or the whole of the display screen, which is often displayed on the start-up of the device or on the opening screen of the content, is gradually brightened, and only during the display of the screen. It is a processing device that executes a control operation for changing the drive condition of the EL panel module 3.

  Specifically, the drive condition control unit 5 detects a screen display input in which a manufacturer logo, a title logo, and the like are gradually lifted, and executes a control operation that emphasizes a luminance change due to the lifted display. That is, processing for improving a high contrast feeling and a dazzling feeling is executed. As a result, logos such as product names and manufacturer names can be impressed on the user, and the degree of impression of the organic EL panel 11 itself can be increased.

In order to realize this effect, the drive condition control unit 5 includes a gradation transition monitoring unit 21 and an emphasis operation control unit 23.
FIG. 5 shows an internal configuration of the gradation transition monitoring unit 21. The gradation transition monitoring unit 21 includes a maximum gradation value transition monitoring unit 41 and an average gradation value transition monitoring unit 43.

  The maximum gradation value transition monitoring unit 41 detects the maximum gradation value Dmax in the frame at regular intervals of about 1 to several frames, and calculates a difference value ΔDmax from the maximum gradation value Dmax detected immediately before. Execute the process.

  The average gradation value transition monitoring unit 43 also detects the average gradation value Dapl in the frame at regular intervals of about 1 to several frames, and calculates a difference value ΔDapl from the average gradation value Dapl detected immediately before. Execute the process. The detection cycle of the average gradation value transition monitoring unit 43 is the same as the detection cycle of the maximum gradation value transition monitoring unit 41.

  FIG. 6 shows an internal configuration of the maximum gradation value transition monitoring unit 41. The maximum gradation value transition monitoring unit 41 includes an intra-frame maximum gradation value detection unit 51, a register 53, a difference value calculation unit 55, and registers 57 and 59.

  The intra-frame maximum gradation value detection unit 51 is a processing device that detects the maximum gradation value Dmax of the gradation values of each pixel constituting the frame image at each detection timing. When one pixel is composed of a plurality of single color pixels, the intra-frame maximum gradation value detection unit 51 detects the maximum gradation value Dmax for the gradation value after gray conversion.

  The register 53 is a storage element that holds the detected maximum gradation value Dmax until the next detection timing. The stored value of the register 53 is updated after the calculation of the difference value calculation unit 55 is completed.

The difference value calculation unit 55 is a calculator that calculates a difference ΔDmax between the maximum gradation value Dmax detected immediately before and the maximum gradation value detected most recently.
The registers 57 and 59 are storage elements that hold the calculated difference ΔDmax of the maximum gradation value twice. Here, the reason why two stages of registers are prepared is to detect the appearance of the emphasis screen using the difference ΔDmax for the two most recent times.

  FIG. 7 shows an internal configuration of the average gradation value transition monitoring unit 43. The average gradation value transition monitoring unit 43 includes an intra-frame average gradation value detection unit 61, a register 63, a difference value calculation unit 65, and a register 67.

  The intra-frame average gradation value detection unit 61 is a processing device that detects the average gradation value of each pixel constituting the frame image at each detection timing. When one pixel is composed of a plurality of single color pixels, the in-frame average gradation value detection unit 61 detects the average gradation value Dapl for the gradation value after gray conversion.

  The register 63 is a storage element that holds the detected average gradation value Dapl until the next detection timing. The storage value of the register 53 is updated after the calculation of the difference value calculation unit 65 is completed.

The difference value calculation unit 65 is a calculator that calculates a difference ΔDapl between the average gradation value Dapl detected immediately before and the average gradation value Dapl detected most recently.
The register 67 is a storage element that holds the difference ΔDapl of the calculated average gradation value.

  The emphasis operation control unit 23 determines the maximum gradation value Dmax (n) detected by the gradation transition monitoring unit 21, the differences ΔDmax (n−1), ΔDmax (n), and the difference ΔDapl of the average gradation values. This is a processing device that determines a driving condition based on this and generates a duty control signal to be supplied to the driver IC block 13.

FIG. 8 shows the contents of the determination process executed by the enhancement operation control unit 23.
First, the emphasis operation control unit 23 determines whether or not the two differences ΔDmax (n−1) and ΔDmax (n) detected for the maximum gradation value are both positive and substantially the same. Determine (S1, S2).

  Satisfying these two determination conditions means that the increase in the maximum gradation value continues at a constant rate twice or more. Here, the reason for determining whether or not they are “substantially the same” is to take into consideration not only the case where the gradation value increases linearly (a constant ratio) but also a case where it increases in a curved line. . Accordingly, in the determination process S1, the difference ΔDmax (n−1) and ΔDmax (n) are determined to be matched in consideration of a certain amount of error.

When an affirmative result is obtained in both of the determination processes S1 and S2, the enhancement operation control unit 23 determines the lighting time ratio β (n)% based on the following equation (S3).
β (n) = α + (100−α) × Dmax (n) / 255 (for 8-bit gradation)
Here, β (n)% means the lighting time ratio of frame n. Α% means a standard lighting time ratio.

This formula shows the maximum gradation value that can be input with the lighting time ratio 100-α% that is not normally used.
By using only the ratio of the maximum gradation value Dmax of the current frame occupying 255 (8-bit gradation), it means that the lighting time length is increased from the standard lighting time ratio α.

By determining the lighting time ratio β (n)% in this way, the peak luminance level can be increased in an accelerated manner in conjunction with the increase in the maximum gradation value Dmax during highlight display.
It should be noted that the peak luminance level after the lighting time ratio β (n) is expanded by the above equation is {α + (100−α) × Dmax (n) / 255} / α times the standard peak luminance level.

  For example, when the standard lighting time ratio α is 50% and the maximum gradation value Dmax (n) of the current frame is 255 (8-bit gradation), the peak luminance level on the screen is the standard peak. It becomes possible to raise it to twice the luminance level.

  In contrast, when a negative result is obtained in the determination process S1 or S2 (that is, when it cannot be determined that the maximum gradation value continuously increases at a certain ratio (when there is no change or the maximum at a certain ratio) The emphasis operation control unit 23 determines whether or not the difference ΔDapl of the average gradation values is substantially 0 (S4).

This determination operation means an operation for determining whether a display image whose maximum gradation value Dmax does not increase at a constant ratio is a still image or a moving image.
When it is determined that the image is a still image, the enhancement operation control unit 23 maintains the lighting time ratio at the immediately preceding detection timing (S5). That is, β (n) = β (n−1) is set.

  Note that the reason why the determination is given a range of “almost 0” is that even if a slight change is detected as a moving image and the peak luminance level changes, the user may feel uncomfortable. In addition, by giving a wide range to the determination in this way, it becomes possible to maintain the highlighted display even when the screen changes such as slowly disappearing.

On the other hand, when it is determined as a moving image, the emphasis operation control unit 23 sets a standard lighting time ratio α (S6). That is, β (n) = α is set.
The emphasis operation control unit 23 turns on the lighting time ratio β (n) set by these determination processes.
The duty control signal Sd is generated so as to match the L level length and is output to the driver IC block 13.

(A-2) Contents of Processing Operation Hereinafter, the control operation of the peak luminance level by the driving condition control unit 5 having the above-described functional configuration will be described based on a specific example.
FIG. 9 shows the change in gradation value and lighting time ratio (duty control signal Sd) immediately after the power is turned on.

FIG. 10 shows the change in the luminance level corresponding to the gradation value and the maximum gradation value immediately after the power is turned on.
9A and 10A represents the detection timing of the maximum gradation value Dmax and the average gradation value Dapl. As shown in the drawing, the detection timing appears at regular intervals every one to several frames.

  First, the processing operation from time t0 to time t1 will be described. In this case, there is no change in the maximum gradation value and the average gradation value. This is because a black screen (the brightness of the maximum gradation value is 0%) is displayed as shown in FIG. In FIG. 10B, the maximum luminance level that can be physically output by the organic EL panel 11 is represented as 100%.

  During this period, the emphasis operation control unit 23 determines that the display image data is a still image, and maintains the lighting time ratio β (n) of the duty control signal Sd at the standard lighting time ratio α which is an initial value. . Also in FIG. 9B, it is confirmed that the lighting time ratio β (n) in this period is the standard lighting time ratio α.

  Next, the processing operation from time t1 to t2 will be described. This period is the first period of highlighting, and the increase of the maximum gradation value Dmax and the average gradation value Dapl is started. However, since the difference ΔDmax between the maximum gradation values is not two, the enhancement operation control unit 23 determines that the display image data is a moving image.

For this reason, the emphasis operation control unit 23 sets the lighting time ratio β (n) of the duty control signal Sd to the standard lighting time ratio α. As a result, as shown in FIG. 9B, the lighting time ratio β (n) is maintained at the standard lighting time ratio α from the time point t0 to t2.
Note that the luminance level corresponding to the maximum gradation value starts to gradually increase from time t1 as shown in FIG.

Next, the processing operation from time t2 to t3 will be described. In this period, the highlighted display control unit 23 detects the appearance of the highlighted display.
During this period, the lighting time ratio β (n) gradually increases as shown in FIG. 9B in conjunction with the increase in the maximum gradation value Dmax shown in FIG.

  In the case of FIG. 9A, since the maximum gradation value Dmax increases to 255 (8-bit gradation), the lighting time ratio β (n) increases to 100% luminance. In FIG. 9B, the change in the lighting time ratio β (n) is shown by a solid line. The dotted line shows the transition when the standard lighting time ratio α is maintained.

  Thus, as the lighting time ratio β (n) increases, the luminance level of the maximum gradation value finally reaches 100% luminance as shown by the solid line in FIG. Note that the broken line in FIG. 10B shows a change in luminance when the lighting time ratio β (n) is fixed to the standard lighting time ratio α.

  Next, the processing operation from time t3 to t4 will be described. During this period, as shown in FIG. 9A, the maximum gradation value Dmax and the average gradation value Dapl are maintained at a constant level. At this time, the highlight display control unit 23 determines that the display image data is a still image.

  At this time, as shown in FIG. 9B, the highlight display control unit 23 maintains the lighting time ratio β (n) at the lighting time ratio (100%) at the time point t3. Of course, the luminance level of the maximum gradation value maintains 100% luminance as shown by the solid line in FIG.

Next, the processing operation after time t4 will be described. During this period, the highlighting is finished and the normal screen display is started.
That is, as shown in FIG. 9A, the maximum gradation value and the average gradation value are sequentially changed. The highlighting control unit 23 that has detected this state determines that the display image data is a moving image.

  For this reason, as shown in FIG. 9B, the highlighting control unit 23 resets the lighting time ratio β (n) to the standard lighting time ratio α and maintains this state. Since the lighting time ratio β (n) is set to the standard lighting time ratio α, the luminance level of the maximum gradation value is variably controlled within a range of α% or less as shown in FIG. Is done.

(A-3) Effect of Embodiment As described above, by applying the drive condition control unit 5 according to the embodiment, the luminance of the logo image or the like that gradually increases in brightness so as to emerge is increased. Can stand out more in the range of performance.

  FIG. 11 shows a highlight image. FIG. 11A shows a conventional display example. FIG. 11B shows a display example when the technology according to the embodiment is applied. In the drawing, the brightness is represented by shading, but in the display example shown in FIG. 11B, the second and third densities are lighter. That is, the contrast and dazzling feeling are emphasized.

In this emphasis operation, as shown in FIG. 10B, the luminance change after application of the emphasis display is proportional to the change in the maximum gradation value. Therefore, the user does not feel uncomfortable.
As a result, the logo (including the manufacturer name, product name, etc.) can be impressed strongly to the user, and the advertising effect can be enhanced.

In addition, as an organic EL display device, an advantage over other competing display devices can be ensured by an additional function capable of displaying a logo with high luminance.
In addition, at the maximum, the lighting time ratio β (n) is extended to 100% of one frame period. However, since the increase period of power consumption due to the increase of the peak luminance level is a short period, the increase in power consumption. Can be kept to a minimum. Therefore, the performance can be sufficiently exhibited not only when the power is supplied from the commercial power supply but also when the battery is driven by the battery.

(B) Other Embodiments (B-1) Other Emphasis Control Methods In the embodiment described above, the case where the peak luminance level is variably controlled by the duty control signal that controls the lighting time ratio within one frame period has been described. .
However, there are other methods for emphasis control that can maximize the performance inherent in the organic EL panel.

For example, a method may be employed in which the lighting time within one frame period is fixed and the peak luminance level is controlled by variably controlling the dynamic range of the voltage value applied to the data line DL.
FIG. 12 shows a functional configuration of an organic EL display device 71 that employs this type of control method. In FIG. 12, the same reference numerals are assigned to the corresponding parts to those in FIG.

The organic EL display device 71 includes an organic EL panel module 73 and a drive condition control unit 75.
Among these, the drive condition control unit 75 includes the gradation transition monitoring unit 21 and the emphasis operation control unit 77. The enhancement operation control unit 77 performs the same determination operation and control operation as those in the embodiment except that the control signal is the gamma reference voltage control signal Sγ.

FIG. 13 shows the control operation of the gamma reference voltage by the enhancement operation control unit 77. FIG. 13B represents a change in the gamma reference voltage. FIG. 13A shows changes in the gradation value and the duty control signal Sd immediately after the power is turned on.
In FIG. 13B, the maximum range of the variable gamma reference voltage is expressed as 100%, and the set value of the gamma reference voltage that is normally used is expressed as α%.

On the other hand, the organic EL panel module 73 includes an organic EL panel 11 and a driver IC block 81.
The driver IC block 81 includes a gamma reference voltage generator 83 that generates a gamma reference voltage to be applied to the digital / analog conversion circuit located at the output stage of the data line driver 33 based on the gamma reference voltage control signal Sγ. Except for this, the circuit configuration is the same as that shown in FIG. However, the voltage generator 83 can also be arranged outside the driver IC block 73.

FIG. 14 shows an internal configuration example of the driver IC block 81. FIG. 15 shows a connection relationship between the gamma reference voltage generator 83 and the data line driver 33.
As shown in FIG. 15, the data line driver 33 includes a shift register 91 that distributes display image data serially input in order of pixel arrangement to corresponding data lines, and a D for data lines that output each data line as an output destination. / A conversion circuit 93.

  The D / A conversion circuit 93 for the data line is supplied with the gamma reference voltage generated by the D / A conversion circuit 95 for generating the gamma reference voltage in the gamma reference voltage generator 83. This gamma reference voltage is a voltage that defines the dynamic range of the analog voltage output from the D / A conversion circuit 93 for the data line.

Needless to say, the wider the dynamic range, the larger the maximum value of the drive current flowing through the organic EL element D, and the organic EL element D can be illuminated with high luminance accordingly.
Even if such a control method is employed, it is possible to obtain the same effect as the embodiment.

(B-2) Other Detection Method of Emphasized Screen In the embodiment described above, the case where the appearance of the emphasized screen is determined based on the difference value of the maximum gradation value has been described.
However, the appearance of the highlight screen may adopt a method given from an external application.

FIG. 16 shows a configuration example of the organic EL display device 101 corresponding to this type of technique. In FIG. 16, parts corresponding to those in FIG. 1 are denoted by the same reference numerals.
The organic EL display device 101 includes an organic EL panel module 3 and a drive condition control unit 103.

  The drive condition control unit 103 includes a gradation transition monitoring unit 105 for linking the peak luminance level during display of the enhancement screen with a change in the maximum gradation value, and enhancement that executes the appearance of the enhancement screen based on information from an external application. The operation control unit 107 is configured.

That is, the enhancement operation control unit 107 executes determination processing corresponding to the determination processing S1 and S2 in FIG. 8 based on the application information. In the application information, for example, logo display, content opening screen display, and other information are given.
Note that the gradation transition monitoring unit 105 is also equipped with a function of detecting a change in average gradation value so that the enhancement operation control unit 107 can determine whether to maintain the peak luminance level.

(B-3) Pixel Structure In the above embodiment, the pixel structure shown in FIG. 2 is illustrated.
However, the pixel structure is not limited to this. For example, as shown in FIG. 17, the current drive element T2 may be an N-channel FET, and the capacitor C may be connected between the gate electrode and the drain electrode of the current drive element T2.

(B-4) Product example (a) Drive IC
The above-described organic EL display devices (organic EL panel module and drive condition control unit) can be formed on a single panel, but the processing circuit portion and the pixel matrix can be separately manufactured and distributed. it can.

For example, the driver IC block and the drive condition control unit are independent drive ICs (integrated
circuit) and can be distributed independently from the organic EL panel. Of course, one driver IC can be constituted by the driver IC block and the drive condition control unit.

(B) Display Module The organic EL display device in the above-described embodiment can be distributed in the form of a display module 111 having the appearance configuration shown in FIG.
The display module 111 has a structure in which a facing portion 113 is bonded to the surface of the support substrate 115. The facing portion 113 uses a glass or other transparent member as a base material, and a color filter, a protective film, a light shielding film, and the like are disposed on the surface thereof.

  Note that the display module 111 may be provided with an FPC (flexible printed circuit) 117 and the like for inputting and outputting signals and the like to the support substrate 115 from the outside.

(C) Electronic device The organic EL display device in the embodiment described above is also distributed in a product form mounted on an electronic device.
FIG. 19 illustrates a conceptual configuration example of the electronic device 121. The electronic device 121 includes the organic EL display device 123 and the system control unit 125 described above. The processing content executed by the system control unit 125 differs depending on the product form of the electronic device 121.

Note that the electronic device 121 is not limited to a device in a specific field as long as it has a function of displaying an image or video generated in the device or input from the outside.
As this type of electronic apparatus 121, for example, a television receiver is assumed. FIG. 20 shows an appearance example of the television receiver 131.

  A display screen 137 including a front panel 133, a filter glass 135, and the like is disposed on the front surface of the television receiver 131. The portion of the display screen 137 corresponds to the organic EL display device described in the embodiment.

  Further, for example, a digital camera is assumed as this type of electronic device 121. FIG. 21 shows an appearance example of the digital camera 141. FIG. 21A is an example of the appearance on the front side (subject side), and FIG. 21B is an example of the appearance on the back side (photographer side).

  The digital camera 141 includes an imaging lens (in FIG. 21, the protective cover 143 is in a closed state, and thus is disposed on the back side of the protective cover 143), a flash light emitting unit 145, a display screen 147, a control switch 149, and a shutter. The button 151 is configured. Among these, the display screen 147 corresponds to the organic EL display device described in the embodiment.

For example, a video camera is assumed as this type of electronic device 121. FIG. 22 shows an example of the appearance of the video camera 161.
The video camera 161 includes an imaging lens 165 that images a subject in front of the main body 163, a shooting start / stop switch 167, and a display screen 169. Of these, the display screen 169 corresponds to the organic EL display device described in the embodiment.

  In addition, for example, a portable terminal device is assumed as this type of electronic device 121. FIG. 23 shows an appearance example of a mobile phone 171 as a mobile terminal device. A cellular phone 171 illustrated in FIG. 23 is a foldable type, and FIG. 23A illustrates an appearance example in a state where the housing is opened, and FIG. 23B illustrates an appearance example in a state where the housing is folded.

  The cellular phone 171 includes an upper housing 173, a lower housing 175, a connecting portion (in this example, a hinge portion) 177, a display screen 179, an auxiliary display screen 181, a picture light 183, and an imaging lens 185. Among these, the display screen 179 and the auxiliary display screen 181 correspond to the organic EL display device described in the embodiment.

In addition, for example, a computer is assumed as this type of electronic device 121. FIG. 24 shows an example of the appearance of a notebook computer 191.
The notebook computer 191 includes a lower casing 193, an upper casing 195, a keyboard 197, and a display screen 199. Among these, the display screen 199 corresponds to the organic EL display device described in the embodiment.

  In addition to these, the electronic device 121 may be an audio playback device, a game machine, an electronic book, an electronic dictionary, or the like.

(B-5) Other Display Device Examples In the description of the embodiment examples, the case where the drive condition control unit is mounted on the organic EL display device has been described.
However, the drive condition control unit can also be applied to other self-luminous display devices. For example, the present invention can be applied to an inorganic EL display device, a display device in which LEDs are arranged, an FED display device, a PDP display device, and the like.

(B-6) Control Device Configuration In the above description, the case where the drive condition control unit is realized in hardware has been described.
However, part or all of the drive condition control unit can be realized as software processing.

(B-7) Others Various modifications can be considered for the above-described embodiments within the scope of the invention. Various modifications and applications created or combined based on the description of the present specification are also conceivable.

It is a figure which shows the function structural example of an organic electroluminescent display apparatus. It is a figure explaining a pixel structure. It is a figure explaining the waveform of a duty control signal. It is a figure which shows the internal structural example of an organic electroluminescent panel module. It is a figure which shows the internal structural example of a gradation transition monitoring part. It is a figure which shows the internal structural example of the maximum gradation value transition monitoring part. It is a figure which shows the internal structural example of an average gradation value transition monitoring part. It is a figure which shows the example of a determination processing procedure performed with an emphasis operation control part. It is a figure explaining the drive control at the time of an emphasis screen appearance. It is a figure explaining the change of screen luminance accompanying emphasis display control. It is a figure which shows the example of a display screen. It is a figure which shows the other function structural example of an organic electroluminescent display apparatus. It is a figure explaining the drive control at the time of an emphasis screen appearance. It is a figure which shows the internal structural example of an organic electroluminescent panel module. It is a figure explaining the connection relation of a gamma reference voltage generator and a data line driver. It is a figure which shows the other function structural example of an organic electroluminescent display apparatus. It is a figure which shows another pixel structure. It is a figure which shows the structural example of a display module. It is a figure which shows the function structural example of an electronic device. It is a figure which shows the example of goods of an electronic device. It is a figure which shows the example of goods of an electronic device. It is a figure which shows the example of goods of an electronic device. It is a figure which shows the example of goods of an electronic device. It is a figure which shows the example of goods of an electronic device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Organic EL display device 5 Drive condition control part 21 Gradation transition monitoring part 23 Enhancement operation control part 41 Maximum gradation value transition monitoring part 43 Average gradation value transition monitoring part

Claims (15)

In a driving condition control device for controlling the driving conditions of an active matrix driving type self-luminous display module,
A gradation transition monitoring unit for monitoring transition of gradation information;
An emphasis operation control unit that controls driving conditions so as to increase the peak luminance level in conjunction with the increase in the maximum gradation value when detecting an emphasis screen in which the maximum gradation value of the frame screen continuously increases A drive condition control device characterized by the above. The drive condition control apparatus according to claim 1,
The gradation transition monitoring unit
A maximum gradation value detection unit that periodically detects the maximum gradation value of the frame screen;
A maximum gradation difference calculation unit that calculates a difference value between the maximum gradation value detected immediately before and the maximum gradation value detected this time;
The enhancement operation control unit
A drive condition control device comprising: a target image detection unit that determines that an emphasis screen has appeared when at least two difference values are equivalent. In the drive condition control device according to claim 2,
The gradation transition monitoring unit
An average gradation value detection unit that periodically detects the average gradation value of the frame screen;
An average gradation difference calculation unit that calculates a difference value between the average gradation value detected immediately before and the average gradation value detected this time;
The enhancement operation control unit
When the difference values for the two most recent gradation values are in the vicinity of the zero value, and the difference value for the most recent one time for the average gradation value is in the vicinity of the zero value, A drive condition control apparatus, wherein the drive condition is controlled so as to maintain a set peak luminance level, and in other cases, the drive condition is controlled to a standard value. The drive condition control apparatus according to claim 1,
The emphasis operation control unit changes a peak luminance level by variable control of a light emission period ratio in a frame. The drive condition control apparatus according to claim 1,
The emphasis operation control unit changes a peak luminance level by variable control of a dynamic range of a voltage value applied to a data line of a self-luminous display module. In an active matrix drive type self-luminous display module drive condition control device,
A gradation transition monitoring unit that monitors transition of gradation information based on application information input from the outside;
An emphasis operation control unit that controls driving conditions so as to increase the peak luminance level in conjunction with the increase in the maximum gradation value when detecting an emphasis screen in which the maximum gradation value of the frame screen continuously increases A drive condition control device characterized by the above. A self-luminous display module having an active matrix drive type pixel structure;
A gradation transition monitoring unit for monitoring transition of gradation information;
An emphasis operation control unit that controls driving conditions so as to increase the peak luminance level in conjunction with the increase in the maximum gradation value when detecting an emphasis screen in which the maximum gradation value of the frame screen continuously increases Self-luminous display device characterized by the above. The self-luminous display device according to claim 7,
A self-luminous display device, wherein each pixel is composed of an electroluminescent element. A self-luminous display module having an active matrix drive type pixel structure;
A gradation transition monitoring unit that monitors transition of gradation information based on application information input from the outside;
An emphasis operation control unit that controls driving conditions so as to increase the peak luminance level in conjunction with the increase in the maximum gradation value when detecting an emphasis screen in which the maximum gradation value of the frame screen continuously increases Self-luminous display device characterized by the above. A self-luminous display module having an active matrix drive type pixel structure;
A gradation transition monitoring unit for monitoring transition of gradation information;
An emphasis operation control unit that controls a driving condition so as to increase a peak luminance level in conjunction with an increase in the maximum gradation value when detecting an emphasis screen in which the maximum gradation value of the frame screen continuously increases;
An electronic device comprising: a system control unit. A self-luminous display module having an active matrix drive type pixel structure;
A gradation transition monitoring unit that monitors transition of gradation information based on application information input from the outside;
An emphasis operation control unit that controls a driving condition so as to increase a peak luminance level in conjunction with an increase in the maximum gradation value when detecting an emphasis screen in which the maximum gradation value of the frame screen continuously increases;
An electronic device comprising: a system control unit. In a driving condition control method for controlling the driving conditions of an active matrix driving type self-luminous display module,
A process for monitoring the transition of gradation information;
And a process for controlling the driving condition so as to increase the peak luminance level in conjunction with the increase of the maximum gradation value when detecting an emphasized screen in which the maximum gradation value of the frame screen continuously increases. Drive condition control method. In a drive control method for controlling drive conditions of an active matrix drive type self-luminous display module,
A process of monitoring the transition of gradation information based on application information input from the outside;
And a process for controlling the driving condition so as to increase the peak luminance level in conjunction with the increase of the maximum gradation value when detecting an emphasized screen in which the maximum gradation value of the frame screen continuously increases. Drive condition control method. In a computer that controls the driving conditions of an active matrix driving type self-luminous display module,
A process for monitoring the transition of gradation information;
When detecting an emphasized screen in which the maximum gradation value of the frame screen continuously increases, a process for controlling the driving conditions to increase the peak luminance level in conjunction with the increase in the maximum gradation value is executed. Computer program. In a computer that controls the driving conditions of an active matrix driving type self-luminous display module,
A process of monitoring the transition of gradation information based on application information input from the outside;
When detecting an emphasized screen in which the maximum gradation value of the frame screen continuously increases, a process for controlling the driving conditions to increase the peak luminance level in conjunction with the increase in the maximum gradation value is executed. Computer program.