JP2008026762A - Controller and control method for light emission condition, image processor, self-luminous light emitting display device, electronic equipment, and computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain the peak luminance and picture quality even with reduced power consumption. <P>SOLUTION: A controller for light emission conditions supplies light emission conditions to a self-luminous light emitting display panel, the conditions that give the same peak luminance as the peak luminance when reference light emission conditions are supplied and that reduce the power consumption of the self-luminous light emitting display panel than the consumption when the reference light emission conditions are supplied. Specifically, an anode voltage is set to be smaller than the anode voltage under reference light emission conditions, and an effective lighting time length in one frame is set to be longer than the effective lighting time length of the reference light emission conditions. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The invention described in this specification relates to a technique for controlling light emission conditions supplied to a self-luminous display panel.
The invention proposed by the inventors has aspects as a light emission condition control device, an image processing device, a self-light emitting display device, an electronic device, a light emission condition control method, and a computer program.

  Today, further reduction in power consumption is required for self-luminous display devices. In order to solve this technical problem, for example, improvement of luminous efficiency is effective. However, improvement of luminous efficiency requires accumulation of technology and generally requires long-term research.

  For this reason, the solution of the technical problem by control of peak luminance is examined. Hereinafter, an example of the currently proposed low power consumption technology will be shown.

JP-A-2003-134418 discloses a mechanism for reducing power consumption by lowering peak luminance.

  However, the decrease in peak luminance narrows the contrast. That is, there is a problem of degrading the original image quality.

  Therefore, as one of the solutions, the inventors have a light emission condition that can obtain the same peak luminance as when the reference light emission condition is supplied, and the power consumption of the self-luminous display panel is smaller than that when the reference light emission condition is supplied. We propose a technology for supplying the light emission conditions to a self-luminous display panel.

Further, as another solution, the light emission condition that provides a higher peak luminance than when the reference light emission condition is supplied, but the light emission condition in which the power consumption of the self-luminous display panel is smaller than that when the reference light emission condition is supplied is determined. We propose a technology for supplying light-emitting display panels.
Propose.

  By adopting the technique proposed by the inventors, it is possible to reduce power consumption while realizing a peak luminance equal to or higher than that when the self-luminous display panel is driven under the reference light emission condition.

Hereinafter, the light emission condition control technique according to the present invention 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
Here, a case where a light emission condition control device is mounted on an organic EL display device will be described.
FIG. 1 shows a functional configuration example of the organic EL display device 1. The organic EL display device 1 includes two functional blocks, a light emission condition control device 11 and an organic EL panel module 21.

(A-1) Functional Configuration of Light Emission Condition Control Device The light emission condition control device 11 is a processing device that variably controls the light emission conditions of the organic EL panel module 21. The light emission condition control device 11 in this embodiment is a light emission condition in which the same peak luminance as that at the time of supply of the reference light emission condition is obtained, but light emission in which the power consumption of the organic EL panel module 21 is smaller than that at the time of supply of the reference light emission condition. It functions as a processing device that variably controls conditions according to the average screen brightness.

In order to realize this function, the light emission condition control device 11 includes three functional blocks: a screen luminance calculation unit 13, a light emission condition control unit 15, and a duty pulse generation unit 17.
Among these, the screen luminance calculation unit 13 is a processing device that calculates a screen average value of one frame unit of the input video signal. The calculation period is from one vertical synchronization signal to the next vertical synchronization signal.

  The light emission condition control unit 15 sets a light emission condition that can achieve the same peak luminance as that of the reference light emission condition but can consume less power than the reference light emission condition in accordance with the screen average luminance of the input video signal. It is. In the case of this embodiment, the light emission condition is given by two parameters: a power supply voltage value supplied to the organic EL panel module 21 and a lighting time length (ratio) within one frame period.

  It is assumed that the reference light emission condition is given by a power supply voltage value (anode voltage value) of 15 V and a lighting time length of 25% of one frame. Usually, this light emission condition is applied to all values that can be taken by the average screen luminance. This light emission condition is determined from the viewpoint of securing moving image response characteristics and peak luminance.

  The light emission condition control unit 15 adjusts the decrease amount of the power supply voltage value (anode voltage value) and the increase amount of the lighting time length according to the screen average brightness, and sets the light emission condition suitable for the input video signal. The light emission condition is set by using a method of referring to a predetermined conversion table in addition to a method of calculating through a predetermined relational expression.

In the case of this embodiment, a conversion table is used to set the light emission conditions in real time.
The light emission condition control unit 15 supplies the power supply voltage value determined as the light emission condition to the organic EL module 21 and supplies the lighting time length to the duty pulse generation unit 17.

  The duty pulse generator 17 is a processing device that generates a duty pulse signal in accordance with the lighting time length set for each frame. The duty pulse generator 17 receives a timing signal from an input video signal and generates a duty pulse signal that realizes a given lighting time length. The duty pulse generator 17 inputs a vertical synchronization pulse as a timing signal. However, horizontal synchronization pulses are also referred to as necessary.

  FIG. 2 shows an example of the wavelength of the duty pulse signal. In the case of FIG. 2B, the L level length of the duty pulse signal corresponds to the lighting time length in one frame. Note that the maximum lighting time is one frame period shown in FIG.

(A-2) Functional Configuration of Organic EL Panel Module FIG. 3 shows a functional configuration example of the organic EL panel module 21. The organic EL panel module 21 includes a timing control unit 23, a data line driver 25, gate line drivers 27 and 29, a power supply voltage source 31, and an organic EL display panel 33.

The timing control unit 23 is a processing device that generates various timing signals necessary for screen display based on a timing signal included in an input video signal.
The data line driver 25 is a circuit device that drives the data lines of the organic EL display panel 33.

  The data line driver 25 performs an operation of converting a gradation value designating the light emission luminance of each pixel into an analog voltage value and supplying it to the data line. The data line driver 25 is composed of a known drive circuit.

  The gate line driver 27 is a circuit device that sequentially selects gate lines provided for selecting a horizontal line for writing a gradation value. The gate line driver 27 is composed of a shift register having stages corresponding to the number of vertical resolutions. The gate line driver 27 is also composed of a known drive circuit.

The gate line driver 29 is a circuit device that drives a gate line provided for supplying a duty pulse signal. The gate line driver 29 is also composed of a known drive circuit.
The power supply voltage source 31 is a circuit device that supplies an analog voltage corresponding to a control voltage value given as a light emission condition to a power supply line. The power supply voltage source 31 is composed of a known circuit that can generate an arbitrary analog voltage within a variable range.

  The organic EL display panel 33 is a display device in which organic EL elements are arranged in a matrix. The organic EL display panel 33 is for color display. Accordingly, one pixel (pixel) on the display is composed of pixels (subpixels) corresponding to the three colors of RGB.

FIG. 4 shows a connection relationship between the pixel circuit 41 formed at the intersection of the data line and the gate line and the peripheral circuit.
The pixel circuit 41 includes a data switch element T1, a capacitor C1, a current supply element T2, and a lighting period control element T3.

Here, the data switch element T1 is a transistor that controls the capture of a voltage value applied through the data line. The capture timing is controlled by the gate line driver 27.
The capacitor C1 is a storage element that holds the acquired voltage value for one frame. By using the capacitor C1, a light emission mode similar to that in the field sequential driving is realized.

The current supply element T2 is a transistor that supplies a drive current corresponding to the voltage value of the capacitor C1 to the organic EL element D1.
The lighting period control element T3 is a transistor that controls supply and stop of driving current to the organic EL element D1.

The lighting period control element T3 is arranged in series with respect to the drive current supply path. While the lighting period control element T3 is on, the organic EL element D1 is lit. On the other hand, the organic EL element D1 is turned off while the lighting period control element T3 is turned off.
The signal applied to the lighting period control element T3 is the aforementioned duty pulse signal (FIG. 2).

(A-3) Light emission condition control operation The light emission condition control operation proceeds according to the processing procedure shown in FIG. First, the screen brightness calculation unit 13 calculates the screen average brightness of the input video signal (S1). The light emission condition control unit 15 determines the light emission condition corresponding to the calculated screen average brightness by reading it from the conversion table (S2).

  FIG. 6 shows an example of the conversion table. FIG. 6 shows a case where the average screen brightness can be expressed by 8 bits. That is, it is for the case where the screen average brightness can be expressed by 256 values from “0” to “255”.

  In the case of FIG. 6, the power supply voltage value is changed to a smaller value as the screen average luminance increases, while the lighting time length is changed to a longer value. For example, the power supply voltage value of the light emission condition corresponding to “255” (that is, all white) of the screen average luminance is changed to “12 V”, and the lighting time length is changed to 100%.

  It should be noted that any combination of the power supply voltage value and the lighting time length associated with each screen average brightness can obtain the same peak brightness as the reference light emission condition (the screen average brightness is “0”), but the power consumption is reduced. The condition is met.

7 and 8 show the principle that power consumption can be reduced while maintaining peak luminance.
FIG. 7A shows various characteristics corresponding to the reference light emission conditions. A nonlinear relationship is established between the power supply voltage applied to the organic EL element D1 and the current at that time. Further, a non-linear relationship based on the gamma characteristic is also established between the gradation value and the luminance.

  Further, a linear relationship is established between the duty pulse signal and the luminance. As shown in FIG. 7A, the lighting time length under the reference light emission condition is given as 25% of one frame.

  FIG. 7B shows a case where only the power supply voltage applied to the organic EL element is reduced to reduce power consumption, and the lighting time length is maintained at 25% of one frame. In this case, as shown by the arrows in the figure, it can be seen that even when the same gradation value is given, the light emission luminance of the organic EL element D1 decreases uniformly. That is, the peak luminance decreases.

  FIG. 7C shows characteristics when the light emission condition (FIG. 6) employed in this embodiment is employed. The only difference between FIG. 7C and FIG. 7B is that the lighting time length is increased to 50%. However, when the lighting time length is doubled, the peak luminance is raised as indicated by the arrow in the figure, and the same peak luminance as the reference light emission condition is reproduced. That is, the decrease in luminance accompanying the decrease in power supply voltage is compensated for by extending the lighting time length.

  Further, as shown in FIG. 8, the power consumption can be reduced simultaneously with the maintenance of the peak luminance. FIG. 8 is a diagram assuming a case where the power supply voltage is changed to 0.8 times the power supply voltage of the reference light emission condition and at the same time the lighting time length is extended to 50% of one frame. Note that when the power supply voltage is 0.8 times, the current itself flowing through the organic EL element D1 is reduced to 0.5 times the reference light emission condition.

In this case, the power consumption after changing the light emission condition is calculated as 0.8 Vorg × 0.5 Iorg × 0.5. The calculation result is given by 0.2Vorg × Iorg. Vorg is a power supply voltage value determined by the reference light emission condition, and Iorg
Is a current value that flows when the reference light emission condition is set.

  On the other hand, the power consumption under the reference light emission condition is calculated as Vorg × Iorg × 0.25. The calculation result is given by 0.25 Vorg × Iorg.

  As can be seen from the calculation results, a reduction in power consumption is achieved while maintaining peak luminance by adopting a mechanism that lowers the power supply voltage below the reference emission condition and extends the lighting time length beyond the reference emission condition. The

(A-4) Effects Obtained in this Embodiment While maintaining the same peak luminance as when the organic EL panel module 21 is driven and controlled according to the reference light emission conditions, the light emission is smaller than that at the time of supplying the reference light emission conditions. By preparing the conditions in advance, high-luminance screen display and low power consumption can be realized at the same time.

That is, it is possible to reproduce a clear image with sharpness compared to the conventional power saving technology.
In addition, by reducing the lighting time length as the screen average luminance is small and by increasing the lighting time length as the screen average luminance is high, it is possible to maintain a small area high luminance moving point and other moving image response characteristics.

  In addition, the control operation described above can be realized with a small-scale circuit. For this reason, the light emission condition control device 11 can be mounted on the timing control circuit 23 or the like constituting the organic EL panel module 21. That is, the layout change and the mounting space change are not required for mounting the light emission condition control device 11.

(B) Other embodiment examples (B-1) Light emission condition selection control function In the case of the above-described embodiment example 1, regardless of the value of the screen average brightness of the input video signal, it always depends on the calculated screen average brightness. The mechanism for changing and controlling the light emission conditions has been described.

  However, only when the screen average luminance is equal to or higher than the comparison reference value, a mechanism for executing the light emission condition change control may be employed. Note that the comparative reference value is set to a relatively large value such as “200” of the average screen brightness.

  FIG. 9 shows an operation example for realizing such change control. Also in this case, the screen brightness calculation unit 13 calculates the screen average brightness of the input video signal (S11). Next, the light emission condition control unit 15 compares the calculated screen average brightness with the comparison reference value (S12).

  When the screen average brightness is equal to or larger than the comparison reference value (when a positive result is obtained), the light emission condition control unit 15 performs the light emission condition corresponding to the calculated screen average brightness as described in the first embodiment. Is determined through the conversion table (FIG. 6) (S13).

  On the other hand, when the screen average brightness is smaller than the comparison reference value (when a negative result is obtained), the light emission condition control unit 15 uses the reference light emission condition (S14). That is, the power supply voltage (anode voltage) is set to 15V, and the lighting time length is set to 25% of one frame.

  By adopting a method that adopts a mechanism that changes the lighting conditions so that the effect of reducing power consumption is recognized only when video signals with large power consumption are input in this way, low power consumption with less degradation of image quality compared to conventional methods Electricity can be realized.

(B-2) Calculation Example of Screen Average Brightness In the case of the above-described first embodiment, the case where the screen average brightness is calculated based on the input video signal has been described. That is, the case where the screen average brightness is calculated by digital signal processing has been described.

  However, the screen average brightness may be calculated based on the detection result of the current value that actually flows through the organic EL display panel. In this case, an ammeter or the like may be mounted.

(B-3) Other Corresponding Relationships of Light Emission Conditions In the case of the first embodiment described above, it is assumed that the light emission conditions that provide the same peak luminance as the reference light emission conditions are applied.
However, it is also possible to apply a light emission condition that provides a peak luminance greater than the reference light emission condition. Of course, it is assumed that the power consumption after the change is smaller than the reference light emission condition.

  FIG. 10 shows an example of light emission conditions that satisfy this condition. FIG. 10 is an example in which the lighting time length is made longer than the light emission condition (0.8 Vorg, 50% lighting) in which the peak luminance is the same as the reference light emission condition. Here, the lighting time length is set to 60%.

In this case, as shown in FIG. 10, the peak luminance is higher than when the lighting time length is 50%. In addition, the power consumption under the light emission condition shown in FIG. 10 is calculated as 0.8 Vorg × 0.5 Iorg × 0.6. The calculation result is given by 0.24 Vorg × Iorg. This calculation result shows that the power consumption of the reference light emission condition is 0.2 Vorg.
× Iorg is smaller.

  In this way, it is possible to reduce the power consumption compared to before the change while increasing the peak luminance by increasing the power supply voltage a little higher than the light emission condition employed in Embodiment 1 or by increasing the lighting time length. .

  FIG. 11 shows an example in which the power supply voltage is set slightly higher as a whole than the combination of the first embodiment. FIG. 12 shows an example in which the lighting time length is set slightly longer as a whole than the combination of the first embodiment.

  In this case, although the power consumption reduction effect is lower than that of the first embodiment, an effect of increasing the peak luminance can be expected. As a result, it is possible to output an image with a high contrast ratio while reducing power consumption.

(B-4) Reference Light-Emitting Condition In the case of Embodiment 1 described above, the maximum value of 15 V of the power supply voltage value within the variable range and 25% of the lighting time length are determined as the reference light-emitting conditions. That is, the case where the screen average brightness is “0” is set as the reference light emission condition.

  However, a light emission condition that uses a combination of an arbitrary power supply voltage value and an arbitrary lighting time length in the variable range as a reference light emission condition may be determined.

(B-5) Structure and Driving Method of Organic EL Display Panel In the case of the above-described embodiment 1, the case where the organic EL display panel 33 having the active matrix panel structure is controlled to be turned on by the line sequential drive scanning method has been described.

However, this technique can be applied to the lighting control of the organic EL display panel 33 having the same panel structure by the dot sequential driving scanning method or the lighting control of the surface sequential driving scanning method.
The organic EL display panel 33 can also be applied to the case where it has a passive matrix panel structure.

(B-6) Other Functional Configurations of Light-Emitting Condition Control Device In the case of the first embodiment described above, the case where the screen average brightness is calculated in the light-emission condition control device 11 has been described.
However, the calculation of the screen average brightness may be executed outside the light emission condition control device 11, and a mechanism for fetching only the calculation result into the light emission condition control device 11 may be adopted.

FIG. 13 shows a light emission condition control device 43 (organic EL display device 41) that employs this type of functional configuration. In FIG. 13, parts corresponding to those in FIG.
The light emission condition control device 43 shown in FIG. 13 includes a screen average luminance storage unit 45, a light emission condition control unit 15, and a duty pulse generation unit 17.

  Incidentally, the screen average luminance storage unit 45 is realized as a semiconductor storage device or other storage medium. The screen average luminance storage unit 45 can also be realized as a partial storage area of a certain storage medium.

(B-7) Other Functional Configuration of Light Emission Condition Control Device In the case of the first embodiment described above, the case where the light emission condition is changed based on the average screen brightness calculated from the input video signal has been described.
However, the present invention can also be used in the case where one or a plurality of light emission conditions that can obtain the same peak luminance as that of the reference light emission conditions and can reduce power consumption as compared with the reference light emission conditions are set in advance.

FIG. 14 shows a light emission condition control device 53 (organic EL display device 51) that employs this type of functional configuration. In FIG. 14, parts corresponding to those in FIG.
The light emission condition control device 53 shown in FIG. 14 includes a light emission condition storage unit 55 and a duty pulse generation unit 17.

Incidentally, the light emission condition storage unit 55 is realized as a semiconductor storage device or other storage medium. The light emission condition storage unit 55 can be realized as a partial storage area of a certain storage medium.
Further, it is possible to adopt a method of selectively using some light emission conditions stored in the light emission condition storage unit 55 based on an external control signal.

(B-8) Mounting Example Here, a mounting example of the above-described light emission condition control device in an electronic device will be described.

(A) Self-luminous display device The above-mentioned light-emitting condition control device can also be mounted on a self-luminous display device (including a panel module) 61 as shown in FIG.
A self-luminous display device 61 shown in FIG. 15 includes a display panel 63 and a light emission condition control device 65.

(B) Image Processing Device The light emission condition control device described above can also be mounted on an image processing device 81 as an external device that supplies a video signal to the self light emitting display device 71 as shown in FIG.
An image processing device 81 illustrated in FIG. 16 includes an image processing unit 83 and a light emission condition control device 85.

(C) Electronic device These devices can be mounted on various electronic devices including a self-luminous display device. Note that the electronic device here may be portable or stationary. In addition, the self-luminous display device is not necessarily installed in an electronic device.

(C1) Broadcast wave receiving device The light emission condition control device can be mounted on the broadcast wave receiving device.
FIG. 17 shows a functional configuration example of the broadcast wave receiving apparatus. The broadcast wave receiving apparatus 91 includes a display panel 93, a system control unit 95, an operation unit 97, a storage medium 99, a power source 101, and a tuner 103 as main constituent devices.

  The system control unit 95 is constituted by a microprocessor, for example. The system control unit 95 controls the operation of the entire system. The operation unit 97 includes a graphic user interface in addition to a mechanical operator.

  The storage medium 99 is used as a storage area for firmware and application programs in addition to data corresponding to images and videos displayed on the display panel 93. The power source 101 uses a battery power source when the broadcast wave receiving device 91 is portable. Of course, when the broadcast wave receiver 91 is a stationary type, a commercial power source is used.

The tuner 103 is a wireless device that selectively receives a broadcast wave of a specific channel selected by the user from incoming broadcast waves.
This configuration of the broadcast wave receiving apparatus can be used when applied to, for example, a television program receiver or a radio program receiver.

(C2) Audio Device FIG. 18 is a functional configuration example when applied to an audio device as a playback device.
The audio apparatus 111 as a playback device includes a display panel 113, a system control unit 115, an operation unit 117, a storage medium 119, a power source 121, an audio processing unit 123, and a speaker 125 as main constituent devices.

  Also in this case, the system control unit 115 is constituted by a microprocessor, for example. The system control unit 115 controls the operation of the entire system. The operation unit 117 includes a graphic user interface in addition to a mechanical operator.

  The storage medium 119 is a storage area for firmware and application programs in addition to audio data. The power source 121 uses a battery power source when the audio device 111 is portable. Of course, when the audio device 111 is a stationary type, a commercial power source is used.

  The audio processing unit 123 is a processing device that processes audio data. The decompression process of the compression-encoded audio data is also executed. The speaker 125 is a device that outputs the reproduced sound.

  When the audio device 111 is used as a recorder, a microphone is connected instead of the speaker 125. In this case, the audio processing unit 111 realizes a function of compressing and encoding audio data.

(C3) Communication Device FIG. 19 is a functional configuration example when applied to a communication device. The communication device 131 includes a display panel 133, a system control unit 135, an operation unit 137, a storage medium 139, a power supply 141, and a wireless communication unit 143 as main constituent devices.

  Note that the system control unit 135 is configured by, for example, a microprocessor. The system control unit 135 controls the operation of the entire system. The operation unit 137 includes a graphic user interface in addition to a mechanical operator.

  The storage medium 139 is used as a storage area for firmware and application programs in addition to data files corresponding to images and videos displayed on the display panel 133. The power source 141 uses a battery power source when the communication device 131 is portable. Of course, when the communication device 131 is a stationary type, a commercial power source is used.

  The wireless communication unit 143 is a wireless device that transmits and receives data to and from other devices. This configuration of the communication device can be used when applied to, for example, a stationary phone or a mobile phone.

(C4) Imaging Device FIG. 20 is a functional configuration example when applied to an imaging device. The imaging device 151 includes a display panel 153, a system control unit 155, an operation unit 157, a storage medium 159, a power supply 161, and an imaging unit 163 as main constituent devices.

  Note that the system control unit 155 is configured by, for example, a microprocessor. The system control unit 155 controls the operation of the entire system. The operation unit 157 includes a graphic user interface in addition to a mechanical operator.

  The storage medium 159 is used as a storage area for firmware and application programs in addition to data files corresponding to images and videos displayed on the display panel 153. The power supply 161 uses a battery power supply when the imaging device 151 is portable. Of course, when the imaging device 151 is a stationary type, a commercial power source is used.

  The imaging unit 163 includes, for example, a CMOS sensor and a signal processing unit that processes an output signal thereof. This configuration of the imaging apparatus can be used when applied to, for example, a digital camera, a video camera, or the like.

(C5) Information Processing Device FIG. 21 is a functional configuration example when applied to a portable information processing device. The information processing apparatus 171 includes a display panel 173, a system control unit 175, an operation unit 177, a storage medium 179, and a power source 181 as main constituent devices.

  Note that the system control unit 175 is configured by, for example, a microprocessor. The system control unit 175 controls the operation of the entire system. The operation unit 177 includes a graphic user interface in addition to a mechanical operator.

  The storage medium 179 is used as a storage area for firmware and application programs in addition to data files corresponding to images and videos displayed on the display panel 173. The power source 181 uses a battery power source when the information processing apparatus 171 is portable. Of course, when the information processing apparatus 171 is a stationary type, a commercial power source is used.

  This configuration of the information processing apparatus can be used when applied to, for example, a game machine, an electronic book, an electronic dictionary, a computer, and the like.

(B-9) Self-luminous display device In the case of the above-described embodiment, the organic EL display panel has been described as an example. However, this display control technique can be widely applied to other self-luminous display devices. For example, the present invention can be applied to inorganic EL display panels, FED display panels, PDP display panels, and the like.

(B-10) Computer Program The light emission condition control apparatus described in the above-described embodiment can realize not only all processing functions by hardware or software, but also by hardware and software function sharing.

(B-11) Output Timing of Duty Pulse In the case of the first embodiment described above, the duty pulse signal has been described as a signal for controlling the lighting period and the extinguishing period within one frame period.

  However, as shown in FIG. 22, the duty pulse signal (FIG. 22B) may be defined as a signal for controlling the lighting period and the extinguishing period in the horizontal line period (FIG. 22A). Even when the duty pulse is output at such timing, the lighting time length within one frame period is the same as that in the first embodiment.

(B-12) Example of Waveform of Duty Pulse Signal In the case of the first embodiment described above, the case where the duty pulse signal appears once for each of the H level period and the L level period within one frame period has been described.
However, as shown in FIG. 23 (B), the above-described control method is also applied to control so that the H level and L level of the duty pulse appear multiple times within one frame period (FIG. 23 (A)). it can.

(B-13) Others Various modifications can be considered for the above-described embodiments within the scope of the gist 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 a self-light-emitting display apparatus. It is a figure which shows the example of an output of a duty pulse signal. It is a figure which shows the function structural example of a panel module. It is a figure explaining the connection of a pixel circuit and a peripheral circuit. It is a figure which shows the example of a control procedure of light emission conditions. It is a figure which shows the example of the conversion table of light emission conditions. It is a figure explaining the maintenance conditions of peak luminance. It is a figure explaining the reduction effect of power consumption. It is a figure which shows the example of selection control procedure of light emission conditions. It is a figure explaining the reduction effect of the power consumption in the case of raising peak luminance. It is a figure which shows the example of the conversion table of the light emission conditions used when raising peak brightness | luminance. It is a figure which shows the example of the conversion table of the light emission conditions used when raising peak brightness | luminance. It is a figure which shows the other function structural example of a self-light-emitting display apparatus. It is a figure which shows the other function structural example of a self-light-emitting display apparatus. It is a figure which shows the example of mounting to a self-light-emitting display apparatus. It is a figure which shows the example of mounting to an image processing apparatus. It is a figure which shows the example of mounting to an electronic device. It is a figure which shows the example of mounting to an electronic device. It is a figure which shows the example of mounting to an electronic device. It is a figure which shows the example of mounting to an electronic device. It is a figure which shows the example of mounting to an electronic device. It is a figure explaining the other output example of a duty pulse signal. It is a figure explaining the other output example of a duty pulse signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Light emission condition control apparatus 13 Screen brightness calculation part 15 Light emission condition control part 17 Duty pulse generation part 21 Organic EL panel module 45 Screen average brightness memory | storage part 55 Light emission condition memory | storage part

Claims (20)

Supplying the self-luminous display panel with a light-emitting condition that provides the same peak brightness as when the reference light-emitting condition is supplied, and in which the power consumption of the self-luminous display panel is lower than when the reference light-emitting condition is supplied. A light emission condition control device. In the light emission condition control device according to claim 1,
The light emission condition is given by a combination of an anode voltage value supplied to the self light emitting display panel and an actual lighting time length within one frame. The light emission condition control device according to claim 2,
The anode voltage value in the light emitting condition is set to a value smaller than the anode voltage value in the reference light emitting condition, and the actual lighting time length in one frame in the light emitting condition is set to a value longer than the actual lighting time length in the reference light emitting condition. A light emission condition control device. In the light emission condition control device according to claim 1,
The reference light emission condition is given as a maximum value of a variable range that defines an anode voltage value supplied to a self-luminous display panel and a minimum value of a variable range that defines an actual lighting time length in one frame. Light emission condition control device. In the light emission condition control device according to claim 1,
The reference light emission condition is arbitrarily determined within a variable range that prescribes a voltage value that is arbitrarily determined within a variable range that defines an anode voltage value supplied to the self-luminous display panel, and a real lighting time length within one frame. A light emission condition control device characterized by being given as a specified actual lighting time length. The light emission condition control device according to claim 1,
A light emission condition control apparatus characterized by variably controlling light emission conditions according to the average screen brightness. In the light emission condition control device according to claim 6,
The average screen brightness is calculated in units of frames based on an input video signal. The light emission condition control device according to claim 1,
A light emission condition control apparatus characterized by variably controlling light emission conditions supplied to a self-luminous display panel only when the average screen brightness is larger than a comparison reference value. The light emission condition control device according to claim 1,
A light emission condition control apparatus comprising a conversion table in which screen average brightness and light emission conditions are associated, and reading light emission conditions corresponding to the screen average brightness from the conversion table and supplying the light emission conditions to the self-luminous display panel. Light-emitting conditions for supplying light-emitting conditions to the self-light-emitting display panel with light-emission conditions in which the power consumption of the self-light-emitting display panel is lower than that at the time of supplying the standard light-emitting conditions, even though the light-emitting conditions provide higher peak luminance than when the reference light-emitting conditions are supplied A light emission condition control device comprising a control unit. A screen brightness calculation unit for calculating screen brightness based on a video signal supplied to the self-luminous display device;
It is a light emission condition that can obtain the same peak luminance as when the reference light emission condition is supplied, and the light emission condition in which the power consumption of the self-luminous display panel is smaller than that when the reference light emission condition is supplied is determined according to the screen luminance, An image processing apparatus characterized by being supplied to a self-luminous display panel. A screen luminance calculation unit for calculating a screen average luminance based on a video signal supplied to the self-luminous display device;
Light emission corresponding to the screen average brightness among the light emission conditions in which the power consumption of the self-luminous display panel is lower than that at the time of supplying the reference light emission conditions, even though the light emission conditions provide higher peak luminance than that at the time of supplying the reference light emission conditions. An image processing apparatus comprising: a light emission condition control unit that supplies conditions to a self-luminous display panel. A self-luminous display device;
Light emission conditions that provide the same peak luminance as when the reference light emission conditions are supplied, and supply the light emission conditions to the self light emission display panel in which the power consumption of the self light emission display panel is lower than when the reference light emission conditions are supplied A self-luminous display device comprising: a control unit. A self-luminous display device;
Light-emitting conditions for supplying light-emitting conditions to the self-light-emitting display panel with light-emission conditions in which the power consumption of the self-light-emitting display panel is lower than that at the time of supplying the standard light-emitting conditions, even though the light-emitting conditions provide higher peak luminance than when the reference light-emitting conditions are supplied A self-luminous display device comprising: a control device. A self-luminous display device;
Light emission conditions that provide the same peak luminance as when the reference light emission conditions are supplied, and supply the light emission conditions to the self light emission display panel in which the power consumption of the self light emission display panel is lower than when the reference light emission conditions are supplied An electronic device comprising: a control device. A self-luminous display device;
Light-emitting conditions for supplying light-emitting conditions to the self-light-emitting display panel with light-emission conditions in which the power consumption of the self-light-emitting display panel is lower than that at the time of supplying the standard light-emitting conditions, even though the light-emitting conditions provide higher peak luminance than when the reference light-emitting conditions are supplied An electronic device comprising: a control device. A process for supplying to the self light emitting display panel a light emitting condition that provides the same peak luminance as when the reference light emitting condition is supplied, and in which the power consumption of the self light emitting display panel is smaller than that when the reference light emitting condition is supplied. A light emission condition control method comprising: A process for supplying to the self light emitting display panel a light emitting condition in which the power consumption of the self light emitting display panel is lower than that at the time of supplying the reference light emitting condition, even though the light emitting condition provides a higher peak luminance than when the reference light emitting condition is supplied. A light emission condition control method comprising: On the computer,
A process for supplying to the self light emitting display panel a light emitting condition that provides the same peak luminance as when the reference light emitting condition is supplied, and in which the power consumption of the self light emitting display panel is smaller than that when the reference light emitting condition is supplied. A computer program that is executed. On the computer,
A process for supplying to the self light emitting display panel a light emitting condition in which the power consumption of the self light emitting display panel is lower than that at the time of supplying the reference light emitting condition, even though the light emitting condition provides a higher peak luminance than when the reference light emitting condition is supplied. A computer program that is executed.

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