Classifications

• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/2007—Display of intermediate tones
  • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
  • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
  • G09G3/2025—Display of intermediate tones by time modulation using two or more time intervals using sub-frames the sub-frames having all the same time duration
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
  • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
  • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
  • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
  • G09G3/3216—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
  • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
  • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
  • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
  • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
  • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
  • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
  • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
  • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
  • G09G3/3275—Details of drivers for data electrodes
  • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2300/00—Aspects of the constitution of display devices
  • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
  • G09G2300/0809—Several active elements per pixel in active matrix panels
  • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2310/00—Command of the display device
  • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
  • G09G2310/0232—Special driving of display border areas
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2310/00—Command of the display device
  • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
  • G09G2310/0243—Details of the generation of driving signals
  • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2320/00—Control of display operating conditions
  • G09G2320/02—Improving the quality of display appearance
  • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2320/00—Control of display operating conditions
  • G09G2320/06—Adjustment of display parameters
  • G09G2320/0626—Adjustment of display parameters for control of overall brightness
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2320/00—Control of display operating conditions
  • G09G2320/10—Special adaptations of display systems for operation with variable images
  • G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change

Definitions

• APL Average Picture
• the present invention relates to a display control apparatus and a display control method for a video signal including, for example, a PLE (Peak Luminance Enhancement) control means for obtaining a level) and controlling the display brightness in the video display apparatus based on the average brightness level.
• a PLE Peak Luminance Enhancement
• PLE control For performing image display, the above-described PLE control is executed.
• This PLE control calculates the average luminance level of the video signal corresponding to the entire field or frame screen, and operates to control the display luminance level for actual image display based on this average luminance level. .
• Patent Document 1 JP-A-9 281927
• Patent Document 2 Japanese Patent Laid-Open No. 2001-175220
• the video screen displayed by the display device described above has a moving image display area and a non-display area.
• Video (still image) display area may coexist.
• Fig. 1 and Fig. 2 show an example of this.
• the entire area indicated by symbol A indicates the entire screen of the video displayed by the display device, and the area indicated by symbol B indicates the moving image display area.
• a non-moving image display area indicated by C is formed outside the moving image display area B in a frame shape, and is below the frame-shaped non-moving image display area C.
• a fixed pattern such as an icon is displayed in the side area.
• the PLE control controls the average luminance level corresponding to the entire field or frame screen ( Based on (APL), it operates to control the display brightness level of the entire screen.For example, when the screen of the moving image display area B is clear as shown in FIG. The level is lowered, and the non-video display area shown as C is controlled to appear dark.
• the present invention has the above-described technical problem that occurs when the display means for displaying an image having a moving image display area and a non-moving image display area is configured to execute PLE control. It is an object of the present invention to provide a display control apparatus and display control method for a video signal that can eliminate the problem.
• a preferred basic form of the display control apparatus according to the present invention made to solve the above-described problem is that a pixel is arranged at each intersection of a plurality of data lines and a plurality of scanning lines, and the input video signal is displayed.
• a display control device for a video signal that displays an image by selectively lighting the pixel based on the display, and displays the moving image according to a lighting rate of the pixel in the moving image display area in the displayed image.
• Variable control of light emission brightness in the area Brightness control means is provided.
• the basic mode is that a pixel is arranged at each intersection of a plurality of data lines and a plurality of scanning lines.
• a video signal display control method for displaying an image by selectively lighting and driving the pixels based on an input video signal, wherein the video display region sets a moving image display region in the displayed image.
• a luminance control operation for performing variable control of light emission luminance.
• FIG. 1 is a schematic diagram for explaining a display example when PLE control is executed when a moving image display area and a non-moving image display area coexist.
• FIG. 2 is a schematic diagram for explaining another display example.
• FIG. 3 is a block diagram showing a first configuration example of the display control apparatus according to the present invention.
• FIG. 4 is a circuit configuration diagram showing a configuration example of a preferable pixel arranged in the display panel shown in FIG.
• FIG. 5 is a timing diagram showing an example of a gradation control means made by the configuration shown in FIGS. 3 and 4.
• FIG. 6 is a block diagram showing a second configuration example of the display control apparatus according to the present invention.
• FIG. 7 is a schematic diagram for explaining a partition example of a moving image display area and a non-moving image display area.
• FIG. 8 is a schematic diagram for explaining another example of partitioning.
• FIG. 9 is a block diagram showing a third configuration example of the display control apparatus according to the present invention.
• FIG. 10 is a block diagram showing a fourth configuration example.
• FIG. 11 is a circuit configuration diagram showing a configuration example of preferable pixels arranged in the display panel shown in FIG.
• FIG. 12 is a timing diagram showing an example of a gradation control unit configured by the configuration shown in FIGS. 10 and 11.
• FIG. 13 is a block diagram showing a configuration example of an erasing timing signal generating means preferably employed in the configuration shown in FIG.
• Tr2 lighting drive transistor
• FIG. 3 shows the first embodiment, which is an example of a display control apparatus for an active matrix display panel.
• an analog Z digital (AZD) converter 2 and a video signal memory (hereinafter also referred to as VRAM) 3 are connected to the controller circuit 1 and input by an analog video signal is performed.
• the video signal is configured to be supplied to the controller circuit 1 and the AZD converter 2.
• the controller circuit 1 generates a clock signal CK for the AZD converter 2, a write signal W and a read signal R for the VRAM 3 based on horizontal and vertical synchronization signals in the analog video signal.
• the AZD conversion unit 2 samples an input analog video signal based on the clock signal CK supplied from the controller circuit 1, converts this into video data for each pixel, and supplies the video data to the VRAM 3 Acts as follows.
• the VRAM 3 operates so as to sequentially write the video data supplied from the AZD conversion unit 2 to the VRAM 3 by the write signal W from the controller circuit 1.
• a frame memory is used as the VRAM 3, and a video signal for one screen is written on a display panel described later by the above-described writing operation.
• the video signal written to VRAM3 is read from the controller circuit 1.
• the moving image display area setting means is expressed as moving image area setting means 4.
• the moving image display area setting means 4 a configuration having two different functions can be appropriately employed depending on the display form of an image on a display panel to be described later.
• One example is the case where the moving image display area B and the non-moving image display area C on the display screen A are always defined as shown in FIGS. 1 and 2, for example, and each area does not change.
• the moving image display area setting means 4 is configured to designate a predetermined moving image display area for each pixel. That is, the moving image display area setting unit 4 operates to extract video data from the VRAM 3 corresponding to a predetermined moving image display area B and supply it to the lighting rate calculation unit 5 described later.
• the other one is a case where the moving image display area B and the non-moving image display area C are changed by the input video signal on the display screen A shown in FIG. 1 and FIG.
• the moving image display area setting means 4 detects the moving image display area by detecting a time change of the input video signal corresponding to each pixel. It is configured to specify in units of pixels. That is, the moving image display area setting means 4 in this case extracts the video signal from the VRAM 3 corresponding to the moving image display area B set by detecting the time change of the input video signal, and turns on the lighting rate calculation means 5 described later. Operates to supply.
• the moving image display area setting means 4 detects the non-moving image display area (still image area) in the latter case, so that areas other than the still image area are displayed. You can also set the video display area!
• the video signal from the VRAM 3 corresponding to the video display area from the video display area setting means 4 is supplied to the lighting rate calculation means 5, and the lighting rate calculation means 5 converts the video signal corresponding to the video display area to the video signal. Based on this, it operates to calculate the lighting rate in pixel units.
• the lighting rate calculating means 5 can obtain a result equivalent to the function for calculating the average luminance level (APL) of the video signal already described corresponding to the moving image display area.
• the lighting rate data in the moving image display area obtained by the lighting rate calculation means 5 is The brightness control means 6 is supplied.
• the luminance control means 6 is configured to be supplied with the video data read from the VRAM 3, and the luminance control means 6 is used to display a moving image out of the video signals read from the VRAM 3.
• a conversion process of the video signal is executed to change the gradation value of the corresponding video signal based on the lighting rate.
• the luminance control means 6 corresponds to the luminance corresponding to the pixel lighting rate calculated by the lighting rate calculation means 5 among the video signals read out from the VRAM 3 and contributing to the moving image display. It operates so as to execute the process of converting to the gradation value to be performed.
• PLE control for controlling the light emission luminance of each pixel in the moving image display area arranged on the display panel described later is realized.
• the luminance control means 6 converts the video signal subjected to the gradation control by the PLE control into a signal form that can be driven by a data driver to be described later, and outputs it.
• controller circuit 1 described above generates a shift clock signal, a start pulse, and the like for the scan driver 13 and the data driver 14 to be described later based on the horizontal and vertical synchronization signals in the video signal. It is configured to supply to drivers 13 and 14.
• Reference numeral 11 shown in FIG. 3 indicates a display panel in which a large number of pixels 12 each including the light-emitting element having the above-described organic EL element power are arranged in a matrix.
• scanning lines 21 and data lines 22 connected to the scanning driver 13 and the data driver 14, respectively are arranged in directions orthogonal to each other, and the pixels 12 including the light emitting elements are arranged at the intersecting positions thereof.
• Each is arranged.
• Each pixel 12 is configured to be supplied with a lighting driving voltage for the pixel from a power supply circuit 16 via a power supply line 24.
• FIG. 4 shows a circuit configuration corresponding to one pixel arranged on the display panel 11 described above, and this shows the most basic pixel configuration when an organic EL element is used as a light emitting element.
• a data signal Vdata corresponding to the video signal from the data driver 14 is supplied to the pixel 12 via the data line 22 arranged on the display panel to the control TFT, that is, the source of the data write transistor Trl. It is configured
• the gate of the data writing transistor Trl is configured to be supplied with a scanning signal Select (also referred to as writing nors) via a scanning line 21 connected to the scanning driver 13.
• the drain of the data write transistor Trl is connected to the lighting driving TFT, that is, the gate of the lighting driving transistor Tr2, and is connected to one terminal of the charge holding capacitor C1.
• the source of the lighting drive transistor Tr2 is connected to the other terminal of the capacitor C1, and the drive voltage Vcc is supplied from the power supply circuit 16 through the power supply line 24. It is configured.
• the drain of the lighting drive transistor Tr2 is connected to the anode terminal of an organic EL element E1 as a light emitting element, and the power sword terminal of the organic EL element E1 is connected to a reference potential point (ground) of the display panel. .
• the circuit configuration of the pixel 12 shown in FIG. 4 includes a data write transistor Trl force 3 ⁇ 4 channel TFT and a drive transistor Tr2 force 3 ⁇ 4 channel TFT. Then, as shown in FIG. 3, the display panel 11 is configured by arranging a large number of pixels 12 having the above-described configuration in a matrix in the row and column directions.
• a write Norse Select as a scan signal is supplied from the scan driver 13 to the gate of the control transistor Trl in the address period.
• a current corresponding to the data signal Vdata is supplied to the capacitor C1 through the source and drain of the control transistor Trl. Current, capacitor C1 is charged
• the charging voltage is supplied to the gate of the driving transistor Tr2, and the transistor 2 passes a current corresponding to the gate voltage and the driving voltage Vcc supplied to the drain to the EL element E1, whereby EL Element E1 emits light (lights up).
• the transistor Trl When the application of the write pulse to the gate of the control transistor Trl is stopped, the transistor Trl becomes a so-called cutoff. However, the gate voltage of the drive transistor Tr2 is held by the electric charge accumulated in the capacitor C1, thereby maintaining the drive current to the EL element E1.
• the EL element E1 has the data signal in the period up to the next address operation.
• the lighting state corresponding to Vdata can be continued. Therefore, in the address period described above, the lighting or extinguishing of the pixels is controlled according to the data signal Vdata supplied from the data driver 14, and thereby the lighting period in the unit period of each pixel is individually controlled. Gradation control is realized.
• one frame period is divided into a plurality of subframes, and each subframe is divided.
• a control means is employed that realizes gradation control based on the cumulative number of pixel lighting periods within one frame period.
• Fig. 5 shows an example of the gradation control.
• one frame period is divided into seven subframes, and simple summation of the subframe periods is used.
• This shows a simple subframe method for expressing 8 gradations from “gradation 0” to “gradation 7”.
• the data signal Vdata for controlling the pixels to be turned on or off is supplied from the data driver 14 described above.
• the luminance control means 6 controls the gradation of the pixels in the moving image display area in accordance with the lighting rate of the pixels corresponding to the moving image display area, and the lighting rate increases. In this case, the control is performed so as to execute the control for lowering the gradation.
• the gradation power level (n is an integer) is reduced with respect to the gradation based on the input video signal. It works like this. Therefore, when the lighting rate is high, the lighting period in one frame period of the pixel in the moving image display area is reduced, and the light emission luminance of the pixel is suppressed. As a result, low power consumption can be realized.
• the lighting rate of the pixel corresponding to the moving image display area when the lighting rate of the pixel corresponding to the moving image display area is small, it is input It operates to increase the gradation of the video display area by n steps (n is an integer) with respect to the gradation based on the video signal. As a result, the cumulative lighting period in one frame period of the pixels in the moving image display area is expanded, and an image with good contrast in the moving image display area can be displayed. According to the above-described embodiment, since the PLE operation is not executed in the non-moving image (still image) region, the gradation of the non-moving image region is displayed in a gradation based on the input video signal.
• the luminance control means 6 has a moving image display area obtained by the lighting rate calculation means 5 that outputs an output voltage value from the data driver 14 supplied to each data line corresponding to the moving image display area. This is characterized in that it is configured so as to be variably controlled according to the lighting rate of the pixels.
• the data write transistor Trl and the lighting drive transistor Tr2 in the pixel configuration shown in FIG. 4 are set to operate in the analog operation (constant current drive) region. Then, in each address period corresponding to each scanning line 21, the voltage value of the data signal Vdata from the data driver 14 supplied to each data line corresponding to the moving image display area is obtained by the lighting rate calculation means 5. It is configured to be variably controlled according to the lighting rate.
• the voltage value written in the charge holding capacitor C1 of each pixel corresponds to the voltage value of the data signal Vdata.
• the lighting drive transistor Tr2 operates to supply a drive current corresponding to the voltage value written in the charge holding capacitor C1 to the EL element E1. Therefore, a PLE operation is realized in which the luminance of each pixel 12 corresponding to the moving image display area is variably controlled in accordance with the lighting rate obtained by the lighting rate calculation means 5 described above.
• the voltage value of the data signal Vdata from the data driver 14 supplied to each data line corresponding to the non-moving image display area is equal to the lighting rate. Regardless of the input video signal, it is controlled. Therefore, there is a problem that the light emission luminance of the pixels in the non-moving area is affected by the lighting rate. It can be avoided.
• FIG. 6 shows an example of another display control device that is useful for the present invention.
• parts that perform the same functions as the parts shown in FIG. 3 already described are denoted by the same reference numerals, and thus detailed description thereof is omitted.
• the configuration shown in FIG. 4 can be adopted as the configuration of each pixel 12 arranged in the display panel 11.
• the luminance control means 6 in the embodiment shown in FIG. 6 is provided in the moving picture display area obtained by the lighting rate calculating means 5 for the power supply line 24 connected to the pixels corresponding to the moving picture display area.
• a driving voltage that is variable according to the lighting rate of the pixel is supplied, and a driving voltage having a predetermined value is supplied to the power supply line 24 connected to the pixel corresponding to the non-moving image display area. It has the characteristic in the point comprised.
• the power supply circuit 16 is supplied with a variable voltage source EV1 whose output value is variable by luminance control (PLE control) data from the luminance control means 6, and a voltage having a predetermined value.
• a fixed voltage source EF1 is provided.
• the switches SI, S2,... As selection means for selectively supplying the drive voltage from the variable voltage source EV1 or the fixed voltage source EF1 to each power supply line 24 are the power supplies. Corresponding to the supply line 24.
• the moving image display area information data set by the moving image display area setting means 4 is configured to be supplied to the controller circuit 1.
• the controller circuit 1 receives the information data of the moving image display area and selects the switches SI, S2,... In the power supply circuit 16 to the variable voltage source EV1 or the fixed voltage source EF1 side. It is controlled so that they are connected together.
• the power supply line 24 corresponding to the pixels of the moving image display area is connected to each of the switches SI, S2,.
• the variable voltage source EV1 operates to be supplied with the drive voltage, and the power supply line 24 corresponding to the pixels in the non-video display area is connected to the fixed voltage source via the switches SI, S2,. It operates so that the drive voltage from EF1 is supplied.
• the brightness control data from the brightness control means 6 is stored in each pixel 12 of the moving image display area.
• the drive voltage is supplied from the variable voltage source EV1 whose output value is variable by the data, and the luminance of each pixel 12 corresponding to the moving image display area is thus obtained by the lighting rate calculation means 5 described above.
• a PLE operation that is variably controlled according to the rate is realized.
• the drive voltage from the fixed voltage source EF1 is supplied to each pixel 12 in the non-moving picture display area, each pixel 12 corresponding to the non-moving picture display area can be kept at a constant luminance.
• the moving image display area and the non-moving image display area are divided according to the arrangement direction of the power supply lines 24 in the display panel 11. That is, when the arrangement direction of the power supply lines 24 is vertical as in the display panel 11 shown in FIG. 6, the moving image display area B and the non-moving image display area C are displayed on the screen A as shown in FIG. Is divided by vertical lines.
• the arrangement relationship of the scanning lines 21, the data lines 22, and the power supply lines 24 shown in FIG. 6 is arranged on the display panel 11 as it is, for example, rotated by 90 degrees as shown in FIG.
• the screen A can be configured so that the moving image display area B and the non-moving image display area C are partitioned by horizontal lines.
• FIG. 9 shows an example of another display control device that is useful for the present invention, and this shows an example of a display control device intended for a passive matrix type display panel.
• the controller circuit 1 In the configuration of the display control device shown in FIG. 9, the controller circuit 1, the AZD conversion unit 2, the VRAM 3, the moving image display area setting unit 4, the lighting rate calculation unit, similarly to the configuration shown in FIG. 5, the luminance control means 6 is provided. In FIG. 9, except for the controller circuit 1 and the luminance control means 6, the other configurations are omitted.
• the luminance control means 6 in the embodiment shown in FIG. 9 has the pixel in the moving image display area obtained by the lighting rate calculating means 5 for the data line connected to the pixel corresponding to the moving image display area.
• a driving current that is variable according to the lighting rate is supplied, and a driving current having a predetermined value is supplied to the data line connected to the pixel corresponding to the non-moving image display area.
• anode lines Al to An as n data lines are arranged in the vertical direction (column direction), and cathode lines Kl to Km as m scanning lines are in the horizontal direction.
• the organic EL elements El 1 to Enm constituting the pixel are connected between each anode line and the scanning line.
• Each anode line Al to An is connected to an anode line drive circuit 32 as a data driver, and each cathode line Kl to Km is connected to and driven by a cathode line scanning circuit 33 as a scan driver.
• the anode line drive circuit 32 includes a first group of constant current sources Ial to Ian that operate using the drive voltage VH. Signals based on PLE control from the brightness control means 6 are supplied to the first group of constant current sources Ial to Ian. As a result, the output current values (drive current values) of the first group of constant current sources la l to Ian are controlled according to the lighting rate of the pixels in the moving image display area obtained by the lighting rate calculation means 5 described above. Works like
• the anode line drive circuit 32 includes a second group of constant current sources Ibl to Ibn, which are configured to supply a drive current having a predetermined value.
• the first or second group of constant current sources or drive switches Sal to San as selection means capable of selecting a ground as a reference potential point are provided corresponding to the anode lines Al to An.
• the drive switches Sal to San are configured to be switched by a command signal from the controller circuit 1.
• the cathode line scanning circuit 33 is provided with scanning switches Skl to Skm corresponding to the respective cathode lines Kl to Km, and crosstalk that functions as a non-scanning selection potential according to a command signal from the controller circuit 1.
• Either the reverse bias voltage source VM for preventing light emission or the ground potential functioning as a scanning selection potential is connected to the corresponding cathode line.
• a scanning synchronization signal is supplied from the controller circuit 1 to the cathode line scanning circuit 33, whereby the cathode lines Kl to Km are sequentially connected to the ground potential (scanning selection potential). ) Is repeated.
• the controller circuit 1 sends a drive control signal for each scanning line to the anode line driving circuit 32 in synchronization with the scanning synchronization signal. Is supplied.
• the controller circuit 1 is supplied with information data of the moving image display area set by the moving image display area setting means 4 as already described with reference to FIG. Based on this, the controller circuit 1 controls the drive switches Sal to San so as to select the first group of constant current sources Ial to Ian when the pixels in the moving image display area are lit, and displays non-moving images.
• the drive switches Sal to San are controlled so that the second group of constant current sources Ibl to Ibn are selected.
• control the drive switches Sal to San so that the reference potential (ground potential) is selected.
• the first group of constant current sources Ial to Ian whose constant current value is variable according to the brightness control (PLE control) data from the brightness control means 6 is applied to each pixel (EL element) in the moving image display area.
• the drive current from is supplied.
• a PLE operation is realized in which the luminance of each pixel corresponding to the moving image display area is variably controlled in accordance with the lighting rate obtained by the lighting rate calculation means 5 described above.
• a constant drive current from the first group of constant current sources Ial to Ian is supplied to each pixel in the non-moving picture display area, so that the brightness of each pixel corresponding to the non-moving picture display area is kept constant. Can keep.
• the moving image display area and the non-moving image display area are divided depending on the arrangement direction of the anode lines Al to An as the data lines in the display panel 31. . That is, when the arrangement direction of the anode lines Al to An is the vertical direction as in the display panel 31 shown in FIG. 9, the moving image display area B and the non-moving image display are displayed on the screen A as shown in FIG. Region C will be partitioned by a vertical line.
• the moving image display area B and the non-moving image display area C can be configured to be partitioned by horizontal lines.
• FIG. 10 to FIG. 13 show another example of a display control device that is useful for the present invention, which is intended for an active matrix type display panel employing a SES (Simultaneous Erasing Scan) drive system.
• SES Simultaneous Erasing Scan
• An example of the display control device is shown.
• parts that perform the same functions as those shown in FIG. 6 already described are denoted by the same reference numerals, and thus detailed description thereof is omitted.
• the pixels to be lit corresponding to the moving image display area are not lit (turned off) in the middle of one frame or one subframe period.
• a turn-off scanning means for controlling is provided.
• the luminance control means 6 is characterized in that the timing of the extinguishing operation in the extinction scanning means is controlled according to the lighting rate of the pixels in the moving image display area obtained by the lighting rate calculation means 5.
• the erase timing signal generating means 8 and the erase driver 15 functioning as the above-described extinguishing scanning unit are compared with the configuration shown in FIG. Is provided.
• the erase timing signal generation means 8 operates to adjust the output timing of the erase control signal (erase pulse) according to the synchronization signal from the controller circuit 1 and the brightness control (PLE control) data from the brightness control means 6. To do.
• the erase timing signal generation means 8 will be described later in detail with reference to FIG.
• the erase driver 15 functions to receive the timing signal from the erase timing signal generating means 8 and to turn off the pixel 12 during one frame or one subframe period. That is, in the display panel 11, erase signal lines 23 are arranged corresponding to the scanning lines 21 of the respective pixels 12. By supplying an erase pulse to the erase signal lines 23, the erase signal lines 23 can be handled. It operates to turn off the pixels to be turned off.
• FIG. 11 shows an example of the configuration of a pixel that is preferably employed in the SES drive method described above.
• the pixel configuration example shown in FIG. 11 further includes an erasing transistor Tr3 by TFT in addition to the pixel configuration shown in FIG.
• the source and drain of the erasing transistor Tr 3 are connected to both ends of the charge holding capacitor C 1, respectively, and the gate is connected to the erasing driver via the erasing signal line 23 arranged in the display panel 11.
• the functions of the transistors Trl and Tr2 are the same as in the example shown in FIG.
• the gate of the erasing transistor Tr3 is in the middle of the lighting period of the EL element E1 (in the present embodiment, in the middle of one subframe period).
• the erase driver Er is supplied from the erase driver 15 via the erase signal line 23 to turn on the transistor Tr3.
• the electric charge charged in the capacitor C1 is erased (discharged) instantaneously.
• the driving transistor Tr2 is cut off, and the EL element E1 is immediately turned off.
• the lighting period in one subframe of the EL element E1 is controlled, thereby realizing multi-gradation expression.
• FIG. 12 illustrates the PLE control of the moving image display area performed by the configuration shown in FIGS. 10 and 11.
• one frame period is divided into a plurality of subframes, and gradation control is performed by adding up the lighting periods of pixels within one frame period by selecting this subframe. Control means to achieve this is adopted.
• one frame period is divided into seven subframes (SF1 to SF7) for simplification of description, and each subframe in one frame period is selected, so that An example of realizing gradation expression (100% non-lighting can be regarded as one gradation, 7 + 1 gradation expression) is shown.
• FIGS. 12 (a) and 12 (b) show an example of controlling the ratio of the lighting period and the non-lighting period for each subframe based on the luminance control data from the luminance control means 6.
• FIG. Yes shows a large proportion of the lighting period for each subframe, and (b) shows the percentage power of the lighting period for each subframe.
• Note that (a) and (b) show examples in which the gamma value of the gradation characteristic is the same and the dimmer characteristic is changed.
• the lighting control shown in FIG. 12 (a) is executed in the moving image display area, and the pixel points in the moving image display area are When the lighting rate is high, the lighting control shown in Fig. 12 (b) is controlled in the moving image display area.
• the ratio of the lighting period for each subframe is controlled so as to change between FIGS. 12 (a) and 12 (b) according to the level of the lighting rate of the pixel.
• 12 (c) and 12 (d) illustrate the generation timings of the write pulse and the erase pulse described above when the lighting control shown in FIG. 12 (b) is realized.
• the write pulse shown in (c) is generated in synchronization with the start of each subframe, whereby the pixel is turned on.
• an erasure norm shown as (d) is generated, whereby the pixel is turned off.
• the erase pulse shown in FIG. 12 (d) can be generated by the erase timing signal generating means 8 shown in FIG. 13 described next.
• reference numeral 8a indicates a subframe counter
• reference numeral 8b indicates a logical operation unit
• reference numeral 8c indicates a luminance setting table. That is, the subframe counter 8a operates based on the synchronization signal from the controller 1 so as to supply a control signal synchronized with the subframe to the logical operation unit 8b.
• the luminance setting table 8c is supplied with luminance control (PLE control) data from the luminance control means 6, and an appropriate luminance setting table is selected based on the luminance control data.
• the lighting period for each subframe is stored as a parameter.
• the logical operation unit 8b accesses the selected table and corresponds to the subframe numberer. Based on the stored lighting time parameter, it operates to generate the output timing signal of the erase pulse.
• This timing The signal is supplied to the above-described erase driver 15, and the erase driver 15 operates to output an erase pulse for each subframe as described above.
• the PLE control is performed based on the lighting rate of the pixels in the moving image display area with a specific gamma characteristic.
• the erasure driver 15 performs an erasing operation corresponding to the moving image display area, thereby performing brightness control of the moving image display area.
• the erasing operation by the erasing driver 15 is not executed in the non-moving image display area, and the gradation corresponding to the input video signal is made in the pixels corresponding to the non-moving image display area.
• the moving image display region and the non-moving image display region are divided according to the arrangement direction of the erasing signal lines 23 arranged on the display panel 11. . That is, when the arrangement direction of the erasing signal line 23 is horizontal as in the display panel 11 shown in FIG. 10, the video display area B and the non-video display are displayed on the screen A as shown in FIG. Region C will be bounded by horizontal lines.
• the arrangement relationship of the scanning lines 21, the data lines 22, and the erasing signal lines 23 shown in FIG. 10 is arranged on the display panel 11 as it is, for example, rotated by 90 degrees as shown in FIG.
• the moving image display area B and the non-moving image display area C can be configured to be partitioned by vertical lines.

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• Engineering & Computer Science (AREA)
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• Theoretical Computer Science (AREA)
• Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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• 2005
  • 2005-12-26 JP JP2005371437A patent/JP5046355B2/ja not_active Expired - Fee Related
• 2006
  • 2006-12-07 US US12/095,034 patent/US20090284502A1/en not_active Abandoned
  • 2006-12-07 WO PCT/JP2006/324426 patent/WO2007074615A1/ja not_active Ceased

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