CN101135792A - Mobile terminal and display panel driver - Google Patents
Mobile terminal and display panel driver Download PDFInfo
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- CN101135792A CN101135792A CNA2007101471774A CN200710147177A CN101135792A CN 101135792 A CN101135792 A CN 101135792A CN A2007101471774 A CNA2007101471774 A CN A2007101471774A CN 200710147177 A CN200710147177 A CN 200710147177A CN 101135792 A CN101135792 A CN 101135792A
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Abstract
To provide a technique for protecting a fast interface for transferring image data among a plurality of cases from noise caused by controlling of the brightness of the backlight. The mobile terminal according to the present invention has a body case 1 , a display part case 2 , a coupling mechanism 3 for coupling them, a CPU 11 , an LCD panel 13 , a controller driver 15 for driving the LCD panel 13 , a backlight 17 and a backlight driver 16 . The CPU 11 is mounted to the body case 1 , while the LCD panel 13 , the controller driver 15 , the backlight 17 and the backlight driver 16 are mounted to the display part case 2 . The controller driver 15 drives the LCD panel 13 in response to the image data received from the CPU 11 via an interface signal line 18 , while supplying the brightness control signal 21 for controlling the backlight 17 to the backlight driver 16.
Description
Technical field
The present invention relates to portable terminal, more particularly, relate to the portable terminal that utilizes display device backlight (for example, LCD) is installed on it.
Background technology
A problem that occurs in the process of exploitation mobile phone or other portable terminals is to reduce the power consumption of liquid crystal display device.The power consumption of liquid crystal display device is particularly useful for power consumption backlight, occupies the very big part of whole mobile terminal power consumption.Therefore, the needs that have strong reduction backlight power consumption.
One of method that reduces backlight power consumption is that control offers drive current backlight or driving voltage.Even,, make power consumption backlight to reduce to reduce brightness backlight if when having low-light level, also can reduce offering drive current/driving voltage backlight so with good condition display image when backlight.
For example, the Jap.P. spy opens No.2005-148708 and discloses a kind of liquid crystal display device of controlling backlight illumination (that is, offering drive current/driving voltage backlight) according to the view data of the image that shows.In this liquid crystal display device, calculate the gray level histogram of each pixel of each two field picture, and according to the histogram control brightness backlight of calculating.
On the other hand, the Jap.P. spy opens the portable terminal that No.2003-161926 discloses a kind of brilliance control backlight illumination according to exterior light.When the brightness of exterior light the time greater than first threshold, this portable terminal stops to provide electric power to backlight, when the brightness of exterior light is lower than first threshold and greater than second threshold value time, light backlight with first performance number, and when exterior light brightness is lower than second threshold value, light backlight with second performance number that is lower than first performance number.
Another problem of occurring is in the process of exploitation portable terminal, is used for the portable terminal formed to a plurality of housings that connect by engaging mechanism (for example, hinge), such as folding mobile telephone, the technology of circuit is installed.The most typically, such portable terminal has and is installed in a CPU (CPU (central processing unit)) on the housing, and has LCD panel, the lcd driver and backlight that is installed on another housing.View data sends lcd driver via the FPC (flexible print circuit) that is embedded in the engaging mechanism to from CPU.Above-mentioned Jap.P. spy opens No.2003-161926 and discloses a kind of folding mobile telephone with first housing and second housing, this first housing install have optical sensor, the liquid crystal display device of receiver, antenna and translucent (translucent), second housing is installed has operating switch and microphone.
In most of the cases, many signal wires can't be installed in the engaging mechanism inside that is used to engage a plurality of housings.Therefore, employing can transmit the fast interface of data via small number of lines rapidly, to send view data to the lcd driver that is installed in the different housings from CPU.The serial interface technologies of the differential signal of use such as LVDS (Low Voltage Differential Signal), RSDSTM (low run-out tolerance sub-signal) or mobile CMADSTM (the senior differential signal of migration current mould) is to give the typical fast interface that uses the lcd driver from CPU transmitted image data.Because the number of grayscale levels both of number of pixels and LCD plate increases, the data transfer rate that needs further increases.
A problem in such portable terminal is that fast interface is not that resistibility is arranged very much to noise.When fast interface transmits in the small amplitude signal with the rapid data transfer rate, it is subjected to The noise bigger.
As inventor's research, when controlling brightness backlight, the problem of noise effect fast interface is especially serious.When controlling brightness backlight, need change offer drive current/driving voltage backlight.If be used to provide drive current/driving voltage to be set to signal wire near fast interface to power lead backlight, then the signal wire of fast interface may be subjected to The noise.Especially when drive current/driving voltage produced by PWM (width modulation), this drive current/driving voltage had pulse waveform.This causes noise to put on the signal of fast interface.
By means of such background, need be used to protect the fast interface of transmitted image data between a plurality of housings to avoid the technology of the noise effect that produces by control brightness backlight.
Summary of the invention
The fast interface that an object of the present invention is to provide a kind of protection transmitted image data among a plurality of housings is avoided the technology by the caused noise effect of control backlight.
In order to solve the above problems, the present invention adopts means as described below.The description that forms the technical theme of these means comprises the numbers and symbols that uses for corresponding relation between the description of the description that is illustrated in " claim " and " embodiment " in " embodiment ".But included numbers and symbols should not be understood that restrictively to explain the technical scope of describing of the present invention in " claim ".
Portable terminal according to the present invention comprises: first housing (1), second housing (2), the engaging mechanism (3) that is used for engaging movably first housing (1) and second housing (2), the view data that is used to produce view data produce part (11), display panel (13), are used for the display panel drive (15) of response image data-driven display panel (13), the driving circuit (16) that is used to illuminate (17) backlight of display panel (13) and is used to drive (17) backlight.This view data produces part (11) and is installed on first housing (1).On the other hand, display panel (13), display panel drive (15), (17) backlight and driving circuit (16) are installed on second housing (2).This display panel drive (15) is suitable for via the signal wire (18) that is provided with by engaging mechanism (3), produce part (11) from view data and receive view data, and the view data that response receives drives display panel (13), and the brightness control signal (21) that will be used to control (17) backlight brightness simultaneously offers driving circuit (16).
In portable terminal with such configuration, neither need to be provided for providing the power lead of drive current/voltage for the signal wire (18) of display panel drive (15), also do not need to be provided for providing the signal wire of brightness control signal (21) with this signal wire (18) to (17) backlight from driving circuit (16) with being used for producing part (11) transmitted image data from view data.This configuration can reduce the noise from the signal wire that is used for the transmitted image data (18).
According to the present invention, the fast interface that can provide a kind of protection to be used for transmitted image data among a plurality of housings is avoided the technology by the control caused noise effect of brightness backlight.
Description of drawings
Fig. 1 is the vertical view that the mobile terminal configuration in the embodiment of the invention is shown;
Fig. 2 is the block diagram that the configuration of portable terminal shown in Figure 1 is shown;
Fig. 3 is the block diagram that the Control Driver configuration that is installed in the portable terminal shown in Fig. 2 is shown;
Fig. 4 illustrates the block diagram that has the portable terminal embodiment of two housings as condition precedent of the present invention;
Fig. 5 illustrates the block diagram that has another embodiment of portable terminal of two housings as condition precedent of the present invention;
Fig. 6 is the block diagram that the intednsity circuit configuration of controller driver shown in Figure 3 is shown;
Fig. 7 is the sequential chart that the PWM Waveform generating circuit operation of intednsity circuit shown in Figure 6 is shown;
Fig. 8 is the synoptic diagram that is illustrated in intednsity circuit operation in the image setting pattern;
Fig. 9 is illustrated in the synoptic diagram that exterior light is provided with intednsity circuit operation in the pattern;
Figure 10 is illustrated in the synoptic diagram that image/exterior light is provided with intednsity circuit operation in the pattern;
Figure 11 illustrates the block diagram that has the portable terminal embodiment of two housings as condition precedent of the present invention;
Figure 12 illustrates the block diagram that has another embodiment of portable terminal of two housings as condition precedent of the present invention; With
Figure 13 is the block diagram that another configuration of portable terminal shown in Figure 1 is shown.
Embodiment
Fig. 1 is the synoptic diagram of external view that the portable terminal 10 of the embodiment of the invention is shown.This portable terminal 10 comprises two housings of body housing 1 and display part housing 2.Body housing 1 and display part housing 2 engage by engaging mechanism 3, so that can be movable mutually.In this embodiment, body housing 1 is on the axle that rotatably is bonded on the surperficial quadrature of display part housing 2.
Fig. 2 is the block scheme that is illustrated in circuit implementation in the portable terminal 10.Body housing 1 has CPU (view data generation part) 11 and the power circuit 12 that is installed on the multilayer printed circuit board (being designated hereinafter simply as PWB).This display part housing 2 is equipped with LCD panel 13, external light sensor 14, controller driver (display panel drive) 15, backlight driver (being used to drive driving circuit backlight) 16 and is used to illuminate backlight 17 of LCD panel 13.In this embodiment, controller driver 15 is installed on the glass plate of LCD panel 13 by using COG (chip on glass, glass top chip) technology.This controller driver 15 can be made up of a plurality of LSI on the glass plate.
This CPU11 is connected with controller driver 15 via interface circuit 18, and interface circuit 18 is run through engaging mechanism 3 settings that are used to engage body housing 1 and display part housing 2.This CPU 11 (for example uses the fast interface technology, quick serial interface technologies, such as LVDS, RSDSTM and use the mobile CMADSTM of differential signal by a small margin), provide serial image data Din serial and differential clock signal CLK to controller driver 15.
Get back to Fig. 2, external light sensor 14 is measured the outside light intensity that is incident on the portable terminal 10, and produces the external light intensity signal 23 with signal level corresponding with external light intensity.This external light intensity signal 23 is offered controller driver 15 from external light sensor 14.Fig. 2 illustrates wherein that external light sensor 14 separates the configuration that provides with LCD panel 13, and still, external light sensor 14 can be integrated on the LCD panel 13.When being installed on the glass plate of LCD panel 13 with the COG technology when controller driver 15, external light sensor 14 preferably is integrated on the LCD panel 13.In such configuration, when controller driver 15 was installed on the LCD panel 13 with the COG technology, external light sensor 14 can be connected with controller driver 15.
Controller driver 15 is to be used to control the equipment that the image on the LCD panel 13 shows.Especially, this controller driver 15 has following function: the first, and the serial image data Din serial that controller driver 15 responses receive from CPU11 drives the data line of LCD panel 13.The second, controller driver 15 controls are integrated in the gate drivers 32 on the LCD panel 13.In addition, this controller driver 15 produces brightness control signal 21, and this signal is offered backlight driver 16, so that control backlight 17 brightness.By this way, controller driver 15 can be configured to encapsulate interior system (System-in-Package).When controller driver 15 formed monolithic LSI, it was more effective.
Controller driver 15 has intednsity circuit 41, to control backlight 17 brightness.Intednsity circuit 41 response produces brightness control signal 21 by external light sensor 14 measured outside light intensity and serial image data Din serial.In this embodiment, brightness control signal 21 produces by PWM (width modulation).Especially, as shown in Figure 7, this brightness control signal 21 has pulse waveform.Backlight 17 brightness of expectation is high more, and the dutycycle of brightness control signal 21 (that is the pulse width of brightness control signal 21 pulses) is high more.When the brightness when backlight 17 was allow peaked, the dutycycle of brightness control signal 21 was set to 100%.When the brightness when backlight 17 was the minimum value that allows, this dutycycle was set to 0%.
Get back to Fig. 2, backlight driver 16 responses drive backlight 17 from the brightness control signal 21 that intednsity circuit 41 provides.In this embodiment, it is backlight 17 that LED is used for, and these backlight driver 16 current drivers backlight 17.Especially, this backlight driver 16 provides drive current 22 to backlight 17, and this drive current 22 has the waveform corresponding with the waveform of brightness control signal 21.When brightness control signal 21 is " high level " time, the amplitude of this drive current 22 is set to the predetermined current value, and when brightness control signal 21 be " low level " time, be set to 0.The light-emitting component that is used for driven also can be as backlight 17.Under the sort of situation, driving voltage rather than drive current are offered backlight 17.
Above-mentioned backlight driver 16, backlight 17, interface signal line 18, the power lead 20 that is used for the power lead 19 of controller driver and is used for backlight driver are installed in FPC (flexible print circuit) 24.Normally, in portable terminal, use individual layer FPC24,, and can reduce production costs because individual layer FPC24 is more superior aspect flexible.Hereinafter, the FPC24 that uses in this manual represents individual layer FPC.FPC24 is mounted and makes that running through engaging mechanism 3 is provided with, and is connected with the PWB (not shown) of body housing 1.
The embodiment of circuit advantage is shown in figure 2, connects interface signal line 18 antinoises of CPU11 and controller driver 15.Be used to use the interface signal line 18 of fast interface technology transfer view data easily affected by noise.But in the configuration, this controller driver 15 provides the function of control 17 brightness backlight shown in figure 2, and backlight driver 16 is installed on and comprises backlight 17 display part housing 2.Therefore, be used to provide drive current 22 need not arrange along interface signal line 18 to backlight 17 power circuit.Therefore, in the configuration shown in Fig. 2,18 pairs of caused noises of fluctuation by brightness control signal 21 or drive current 22 of interface signal line have drag.This improves the reliability of serial image data Din_serial transmission.
When comparing with the embodiment of circuit shown in the Figure 4 and 5, the advantage of the configuration shown in Fig. 2 is more high-visible.Here will consider such configuration, wherein, as shown in Figure 4, CPU 11 provides the function of control 17 brightness backlight, and external light sensor 14 and backlight driver 16 are installed on the body housing 1 that comprises CPU 11.In the configuration shown in Fig. 4, be used to provide drive current 22 need stride body housing 1 and display part housing 2 layouts to backlight 17 power circuit, that is, arrange along interface signal line 18.In the time of drive current 22 fluctuations, such configuration runs into the problem that noise puts on interface signal line 18.This problem can solve by this way, that is, arrange away from interface signal line 18 to be used to provide drive current 22 to backlight 17 power lead on FPC24.Because it has limited the layout of FPC24, this method is not preferred.
As shown in Figure 5, it is also conceivable that backlight driver 16 wherein is arranged on the configuration in the display part housing 2.But for the reason of following explanation, because the configuration of the portable terminal of the embodiment of the invention shown in figure 2, configuration shown in Figure 5 is not very preferred.
The first, wherein CPU11 shown in Figure 5 provides the configuration of the brightness function of control backlight 17, needs will be used to transmit the signal wire of brightness control signal 21 along interface signal line 18 layouts.As mentioned above, the signal level of brightness control signal 21 fluctuates in the process of control 17 brightness backlight.Therefore, arrange that along interface signal line 18 signal wire that is used to transmit brightness control signal 21 may cause interface signal line 18 to be exposed to noise.
The second, the configuration shown in Fig. 5 is striden body housing 1 and display part housing 2 signal line disposed than what the configuration shown in Fig. 2 had a more number more.In the configuration shown in Fig. 5, be used to provide brightness control signal 21 need stride body housing 1 and display part housing 2 layouts to the signal wire of backlight driver 16.This has increased the number of striding body housing 1 and display part housing 2 signal line disposed.On the other hand, configuration does not need so shown in figure 2.The portable terminal 10 of embodiment shown in Fig. 2 can have than striding body housing 1 and display part housing 2 signal line disposed with the portable terminal lesser number that disposes shown in Fig. 5.
For the controller driver 15 that is installed on the display part housing 2 provides the function of controlling 17 brightness backlight.This is a reason that can realize the circuit embodiments shown in Fig. 2.Conventional liquid crystal panel driver does not provide the function of control backlight illumination.Replace CPU control and be used for the brightness backlight of conventional liquid crystal panel driver.In the configuration shown in the Figure 4 and 5, the CPU11 that is used to produce serial image data Din serial provides the function of control 17 brightness backlight, this configuration both be not suitable for arranges along interface signal line 18 and to be used to provide drive current 22 to backlight 17 power circuit, also is not suitable for to arrange along interface signal line 18 and to be used to provide the signal wire of brightness control signal 21 to backlight driver 16.
Now another preferred embodiment will be described.The signal wire that will be used for slave controller driver 15 transmission brightness control signals 21 as shown in Figure 2 is without any being provided to backlight driver 16 with shortest path troublesomely, and such situation is no problem.Shown in 11 backlight 17 and backlight driver 16 crossover ports signal wires 18 be placed on the opposite side of brightness control signal lead-out terminal 26 and and be driven via interface signal line 18, according to the reason of portable terminal standard, such situation has following problem.That is to say that because portable terminal uses individual layer FPC24, the signal wire that is used to transmit brightness control signal 21 can not be arranged by slave controller driver 15 crossover ports signal wires 18.Therefore, in order to avoid interface signal line 18, this signal wire need be arranged and walk around LCD panel 13 to backlight driver 16.Because it needs extra FPC24, this has disadvantageous effect and is improving production cost aspect saving space, so it is not preferred.
To consider now as in the situation of the multi-layer FPC 25 of Figure 12 illustrated.In this case, can avoid as shown in figure 11 the layout of signal wire that is used to transmit brightness control signal 21.But, in this case, in the FPC25 of multilayer, be used to transmit the signal wire and interface signal line 18 intersections of brightness control signal 21.Therefore, be similar to situation shown in Figure 5, make interface signal line 18 be exposed to noise owing to be used to transmit the circuit of brightness control signal 21, this neither be preferred.In addition, because this situation is used the FPC25 of multilayer, the crooked or folding of the FPC25 of multilayer can cause extra-stress in bending or folding position.In addition, the use of the FPC25 of multilayer has increased the thickness of FPC, and this causes providing the flexibility of deficiency.In addition, from the viewpoint of production cost, realize that in portable terminal the FPC25 of multilayer is unpractical.
As mentioned above, controller driver 15 on being installed in display part housing 2 provides among the present invention of the function of controlling 17 brightness backlight, when the lead-out terminal 26 (being designated hereinafter simply as brightness control signal lead-out terminal 26) of the brightness control signal 21 that is used for transfer control driver 15 when being arranged in a place, be arranged in to backlight driver 16 being limited property controller driver 15 brightness control signal lead-out terminal 26, on the side of interface signal line 18.
Another preferred embodiment that addresses the above problem is shown in Figure 13.As conspicuous, a plurality of brightness control signal lead-out terminals 26 are provided in the present invention from Figure 13.Especially, the brightness control signal lead-out terminal 26 of this controller driver 15 is provided on each side of interface signal line 18 on the intednsity circuit.This makes it possible to arrange backlight driver 16 and the technical manual of not considering portable terminal.Therefore, it need only select in a plurality of brightness control signal lead-out terminals 26 and connect it according to the layout of backlight driver 16.By adopting this mode, will further widen application of the present invention.
The terminal that does not have to use among brightness control signal terminal 26 is done the open circuit processing, and does not have additional components to expend.
For one the configuration of selecting in a plurality of brightness control signal lead-out terminals 26, can consider to select the configuration of which terminal output of a left side and right terminal by the register terminal in controller driver 15, two terminals are all exported, and only selected the configuration of the terminal that will use according to the technical manual of portable terminal.
Use description to realize the concrete configuration of the controller driver 15 of circuit embodiments shown in figure 2 now.
Fig. 3 is the block scheme that the preferred disposition of controller driver 15 is shown.As mentioned above, this controller driver 15 has the intednsity circuit 41 that is used to control 17 brightness backlight.This controller driver 15 also has serial-to-parallel converter circuit 42, data register circuit 43, latch cicuit 44, gray-scale voltage generation circuit 45, data line drive circuit 46, APL counting circuit 47 and sequential control circuit 48.
This serial-to-parallel converter circuit 42 receives the serial image data Din serial that receives from CPU 11, and is converted into view data Din.This view data Din is the parallel data of the gray level of each pixel of expression.Synchronously receive this serial image data Din serial with differential clock signal DCLK.This serial-to-parallel converter circuit 42 also produces synchronizing signal 53 from differential clock signal DCLK, and provides it to sequential control circuit 48.
This data register circuit 43 and the register signal 54 that provides from sequential control circuit 48 synchronously latch the view data Din from serial-to-parallel converter circuit 42 in order, and the view data Din that latchs of interim storage.This data register circuit 43 is suitable for and can comes storing image data Din in the identical number of the number with the pixel of line that driven with controller driver 15 (that is, the number of the data line that is driven by controller driver 15).If controller driver 15 is suitable for driving 384 data lines, then this data register circuit 43 is suitable for storing 384 view data Din.
This latch cicuit 44 and the latch signal 55 that provides from sequential control circuit 48 synchronously latch the view data Din from a line of data register circuit 43, and send the view data Din that latchs to data line drive circuit 46.
This gray-scale voltage produces circuit 45 and produces the corresponding voltage (gray-scale voltage) of each gray level that can take with the pixel of LCD panel 13, and provides it to data line drive circuit 46.In this embodiment, LCD panel 13 is corresponding to the display with 64 gray levels, and therefore, gray-scale voltage offers data line drive circuit 46 via 64 lines.
These data line drive circuit 46 responses are used for driving from the view data Din of a line of latch cicuit 44 receptions the data line of LCD panel 13.Especially, for the view data Din that is used for a line each, this data line drive circuit 46 is selected the gray-scale voltage corresponding to view data Din among 64 gray-scale voltages, and corresponding data line driven is selected gray-scale voltage.
48 pairs of controller drivers 15 of this sequential control circuit and gate drivers 32 are carried out sequential control.Especially, this sequential control circuit 48 and the synchronizing signal 53 that transmits from serial-to-parallel converter circuit 42 synchronously produce register signal 54, latch signal 55 and frame signal 56.By means of these signals, the time sequential routine of these sequential control circuit 48 control intednsity circuits 41, data register circuit 43, latch cicuit 44 and APL counting circuit 47.This sequential control circuit 48 also produces gate drivers control signal 57, and the time sequential routine of control gate driver 32.
The configuration and the operation of intednsity circuit 41 will be described now.The APL (average picture level) 51 that this intednsity circuit 41 is suitable for responding the every two field picture that calculates from the external light intensity signal 23 of external light sensor 14 outputs with by APL counting circuit 47 produces the brightness control signal 21 that is used to control 17 brightness backlight.This intednsity circuit 41 have when outside light intensity lower and APL51 low in, make backlight 17 the lower function of brightness, so that reduce the power consumption of portable terminal 10.When opposite outside light intensity height and/or APL51 were high, this intednsity circuit 41 improved backlight 17 brightness, made that the picture quality with two field picture remains on good state.
Fig. 6 is the block scheme that intednsity circuit 41 configurations in this embodiment are shown.In this embodiment, this intednsity circuit 41 has backlight illumination decision circuitry 61 and PWM Waveform generating circuit 62.This backlight illumination decision circuitry 61 produces backlight brightness data 63 according to external light intensity signal 23 and APL51.This backlight brightness data 63 is the data that are used to specify 17 brightness backlight.The operation of backlight illumination decision circuitry 61 is switched by three kinds of pattern signalizations 52: image model signalization 52a, exterior light pattern signalization 52b, user model signalization 52c.The value of image model signalization 52a, exterior light pattern signalization 52b and user model signalization 52c is provided with by CPU11.
PWM Waveform generating circuit 62 response backlight brightness data 63 produce brightness control signal 21.In this embodiment, PWM Waveform generating circuit 62 produces the brightness control signal 21 that produces by PWM (width modulation).
This backlight illumination decision circuitry 61 has LUT64, the filter circuit 65 that is used for APL, the LUT66 that is used for exterior light, selects circuit 67 and 68, subtracter 69, user that brightness register 70 is set and selects circuit 71.
The LUT64 that is used for APL stores a plurality of brightness of image data " 1 " to " n ", and response APL51 selects brightness of image data (the brightness of image data 72 of selection) from a plurality of brightness of image data " 1 " to " n ".Here, these brightness of image data are the data that are used to judge for the higher limit of backlight brightness data 63.Be chosen in APL51 and have the brightness of image data 72 of the brightness of image data of high value when higher as this selection.In this embodiment, the relation that illustrates below in brightness of image data " 1 " to " n " is set up:
Brightness of image data " 1 "＜brightness of image data " 2 "＜...＜brightness of image data " n ".
In this embodiment, the value of maximum image brightness data " n " is " 63 ".Therefore, the higher limit that is used for the brightness of image data 72 of this selection is " 63 ".
The LUT64 that is used for APL preferably is suitable for rewritable.Be used for the feasible response that can adjust 17 brightness backlight for luminosity (1uminosity) easily of this rewritable LUT64 of APL.In this embodiment, these a few brightness of image data " 1 " offer controller driver 15 to " n " from CPU11, and the brightness of image data " 1 " that provide are stored in the LUT64 that is used for APL to " n ".
This filter circuit 65 produces filtered external light intensity signal 73 by to outside light intensity signal 23 filtering.In this embodiment, hysteresis wave filter (hysteresis filter) is used for this filter circuit 65.Using the hysteresis filtering for filter circuit 65 is being effective aspect the fluctuation of response external light intensity signal 23 exceedingly of restriction backlight brightness data 63.
The LUT66 that is used for exterior light stores a plurality of exterior light brightness datas " 1 " to " m ", and response APL51 selects an exterior light brightness data (the exterior light brightness data 74 of selection) from these a plurality of exterior light brightness datas " 1 " to " m ".This exterior light brightness data is the data of expression backlight 17 the brightness degree that can reduce.The LUT66 that is used for exterior light select when the value of filtered external light intensity signal 73 higher in (that is, when outside light intensity higher in) have than the external light intensity data of low value exterior light brightness data 74 as this selection.In this embodiment, set up for these a few exterior light brightness datas " 1 " to the relation that illustrates below " m ":
Exterior light brightness data " m "＜exterior light brightness data " m-1 "＜...＜exterior light brightness data " 1 ".
In this embodiment, the minimum value of this exterior light brightness data " m " is " 0 ".Therefore, the lower limit that is used for the exterior light brightness data 74 of this selection is " 0 ".
The LUT66 that is used for exterior light preferably is suitable for rewritable.The rewritable LUT66 that is used for exterior light makes and can adjust backlight 17 luminosity response easily for external light intensity.In this embodiment, these exterior light brightness datas " 1 " offer controller driver 15 to " n " from CPU11, and these exterior light brightness datas " 1 " that provide are stored in the LUT66 that is used for exterior light to " n ".
This selects circuit 67 response image pattern signalization 52a, brightness of image data 72 or output data value " 63 " that output is selected.Especially, when image model signalization 52a was logical one, the brightness of image data 72 of this selection were selected, and when image model signalization 52a was logical zero, this data value " 63 " was selected.As mentioned above, the maximal value of the brightness of image data 72 of this selection is " 63 ".Therefore, selection data value " 63 " equals not consider APL51 and the brightness of image data of selecting 72 is set to maximal value.
This selects circuit 68 response external optical mode signalization 52b, exterior light brightness data 74 or output data value " 0 " that output is selected.Especially, when exterior light pattern signalization 52b was logical one, the exterior light brightness data 74 of this selection was selected, and when exterior light pattern signalization 52b was logical zero, " 0 is selected for this data value.As mentioned above, the minimum value of the exterior light brightness data 74 of this selection is " 0 ".Therefore, selection data value " 0 " equals not consider external light intensity signal 23 and the exterior light brightness data of selecting 74 is set to minimum value.
This subtracter 69 is by deducting the brightness data 75 after the output valve of selecting circuit 68 produces subtraction from the output valve of selecting circuit 67.
This user is provided with brightness register 70 and preserves users brightness data 76 is set, and its expression is by backlight 17 brightness of user's appointment of portable terminal 10.This user is provided with brightness data 76 and sends controller driver 15 to from CPU11, and is kept at the user and is provided with in the brightness register 70.
This selects circuit 71 response user model signalization 52c, and brightness data 75 or selection user behind the selection subtraction are provided with brightness data 76.Especially, when user model signalization 52c was logical one, it is selected that this user is provided with brightness data 76, and when user model signalization 52c was logical zero, it is selected that this user is provided with brightness data 76.From the output of selecting circuit 71 is above-mentioned backlight brightness data 63.Be provided for PWM Waveform generating circuit 62 from the backlight brightness data 63 of selecting circuit 71 outputs.
Fig. 7 is the sequential chart that 62 operations of PWM Waveform generating circuit are shown.When frame signal 56 is activated (at Fig. 1, when this signal pulled down to low level the time), this PWM Waveform generating circuit 62 latchs backlight brightness data 63.This PWM Waveform generating circuit 62 further produces brightness control signal 21, makes signal 21 have the dutycycle according to backlight brightness data 63 values.When being higher along with the value of backlight brightness data 63, this dutycycle increases.
This brightness control signal 21 of Chan Shenging is used in the control backlight driver 16 by this way.When brightness control signal 21 was in " height " level, this backlight driver 16 provided drive current 22 to backlight 17.When brightness control signal 21 is in " low " level, do not provide drive current 22 to backlight 17.Therefore, the dutycycle of brightness control signal 21 is big more, that is, the value of backlight brightness data 63 is big more, and backlight 17 cycles of being lighted are long more, and this has improved backlight 17 brightness.
This intednsity circuit 41 has following four kinds of operator schemes that illustrate.Operator scheme is switched by image model signalization 52a, exterior light pattern signalization 52b and user model signalization 52c.
(1) user is provided with pattern
With reference now to Fig. 6.When user model signalization 52c was set to logical one, this intednsity circuit 41 can be set to the user pattern is set.It is a kind of operator scheme of backlight 17 that is used for lighting with the brightness of user's appointment that this user is provided with pattern.The value of image model signalization 52a and exterior light pattern signalization 52b can be an arbitrary value.
Especially, when user model signalization 52c was set to logical one, this selection circuit 71 was provided with brightness data 76 with the user and selects as backlight brightness data 63.With the brightness of backlight brightness data 63 appointments light this backlight 17.According to this operation, can with light by the brightness of user's appointment this backlight 17.
(2) image setting pattern
52a is set to logical one when the image model signalization, and exterior light pattern signalization 52b and user model signalization 52c be when being set to logical zero, and this intednsity circuit 41 can be set to the image setting pattern.This image setting pattern is wherein according to the operator scheme of the brightness of the APL51 (not considering outside light intensity) of two field picture control backlight 17.
Especially, the brightness of image data 72 of this selection are to choose to " n " from these a few brightness of image data " 1 " according to the APL51 that is calculated by APL counting circuit 47.Response image pattern signalization 52a is the fact of logical one, and the brightness of image data 72 of this selection are exported to subtracter 69 from selecting circuit 61.On the other hand, response external optical mode signalization 52b is the fact of logical zero, and these data " 0 " are exported to subtracter 69 from selecting circuit 68.The value of the brightness data 75 behind the subtraction of subtracter 69 output is mated with the value of the brightness of image data 72 of selection.Response user model signalization 52c is set to the fact of logical zero, and this selects circuit 71 that the brightness data behind the subtraction 75 is selected as backlight brightness data 63.Therefore, this backlight brightness data 63 and brightness of image data 72 couplings of selecting.This backlight 17 is lighted with the brightness of backlight brightness data 63 appointments.Operate according to this, control backlight 17 brightness according to APL51.
Fig. 8 illustrates when intednsity circuit 41 is set to the image setting pattern, the figure of relation between APL51 and backlight brightness data 63.As APL51 when being low, that is, when two field picture was dark, this backlight brightness data 63 was lowered, and made that backlight 17 brightness reduces.When two field picture was dark, even backlight 17 brightness reduces, the picture quality of this two field picture did not reduce yet.Because it reduces power consumption, it is quite preferred reducing backlight 17 brightness.When opposite APL51 was high, backlight 17 brightness increased, and this two field picture is shown with the preferable image quality.
(3) exterior light is provided with pattern
52b is set to logical one when exterior light pattern signalization, and image model signalization 52a and user model signalization 52c be when being set to logical zero, and this intednsity circuit 41 can be set to exterior light pattern is set.It is operator scheme according to the brightness of external light intensity (not considering APL51) control backlight 17 that this exterior light is provided with pattern.
Especially, be the fact of logical zero according to image model signalization 52a, these data " 63 " are outputed to subtracter 69 from selecting circuit 67.On the other hand, the exterior light brightness data 74 of this selection is according to external light intensity signal 23 (promptly, according to outside light intensity) from these exterior light brightness datas " 1 " to " m ", choose, in addition, 52b is the fact of logical one according to exterior light pattern signalization, and the exterior light brightness data " 74 " of this selection is outputed to subtracter 69 from selecting circuit 68.The value of the brightness data 75 behind the subtraction of subtracter 69 outputs is the values that obtain by the value that deducts the exterior light brightness data 74 of selection from data " 63 ".Be set to the fact of logical zero according to user model signalization 52c, this selects circuit 71 that the brightness data behind the subtraction 75 is selected as backlight brightness data 63.Therefore, this backlight brightness data 63 is the values that obtain by the value that deducts the exterior light brightness data 74 of selection from data " 63 ".Brightness with backlight brightness data 63 appointments lights backlight 17.According to this operation, this brightness of backlight 17 is controlled according to outside light intensity.
Fig. 9 illustrates when intednsity circuit 41 to be set to exterior light when pattern is set, externally the figure of relation between light intensity and the backlight brightness data 63.In this embodiment, by this exterior light shown in the external light intensity signal 23 by digitalized with 256.When outside light intensity was low, this backlight brightness data 63 reduced, and makes this brightness of backlight 17 reduce.When outside light intensity was low, even this brightness of backlight 17 reduces, the picture quality of two field picture did not reduce yet.Because it reduces power consumption, it is preferred reducing backlight 17 brightness.Opposite when outside light intensity is high, backlight 17 brightness increases, and with preferable image quality display frame image.Because use the hysteresis wave filter as filter circuit 65, figure shown in Figure 9 comprises hysteretic phenomenon.
(4) image/exterior light is provided with pattern
When image model signalization 52a and exterior light signalization 52b are set to logical one, and user model signalization 52c can be set to image/exterior light with this intednsity circuit 41 pattern is set when being set to logical zero.It is to control the operator scheme of backlight 17 brightness according to APL51 and outside light intensity that this image/exterior light is provided with pattern.
Especially, the brightness of image data 72 of this selection are to choose to " n " from a plurality of brightness of image data " 1 " according to the APL51 that is calculated by APL counting circuit 47, and, the exterior light brightness data 74 of this selection is to choose to " m " from a plurality of exterior light brightness datas " 1 " according to external light intensity signal 23 (that is, according to outside light intensity).In addition, response image pattern signalization 52a and exterior light pattern signalization 52b both are the facts of logical one, and the brightness of image data 72 of this selection and the exterior light brightness data 74 of this selection are exported to subtracter 69 from selection circuit 67 and 68 respectively.The value of the brightness data 75 behind the subtraction of subtracter 69 output is the values that obtain by the value that deducts the exterior light brightness data 74 of selection from the value of the brightness of image data 72 selected.In addition, response user model signalization 52c is set to the fact of logical zero, and this selects circuit 71 that the brightness data behind the subtraction 75 is selected as backlight brightness data 63.Therefore, this backlight brightness data 63 is the values that obtain by the value that deducts the exterior light brightness data 74 of selection from the value of the brightness of image data 72 selected.With the brightness of backlight brightness data 63 appointments light this backlight 17.According to this operation, this brightness of backlight 17 is controlled according to APL51 and outside light intensity.
Figure 10 illustrates when intednsity circuit 41 to be set to image/exterior light when pattern is set, the figure that concerns between APL51 and the outside light intensity.Because use the hysteresis wave filter as filtering circuit 65, figure shown in Figure 10 comprises hysteretic phenomenon.The figure that this backlight brightness data 63 in the pattern is set in image/exterior light is the APL51 shown in Figure 8 that moves in vertical direction according to the exterior light brightness data of selecting 74 and the figure of backlight brightness data 63.When intednsity circuit 41 is arranged in such a way when image/exterior light is provided with pattern, control the value of this backlight brightness data 63 according to APL51 and external light intensity, that is, and backlight 17 brightness.
As mentioned above, in the portable terminal 10 of this embodiment, be installed in controller driver 15 in the display partial shell 2 and provide the function that produces the brightness control signal 21 that is used to control 17 brightness backlight.Therefore, neither need to be provided for providing the power lead of drive current 22, do not need to be provided for transmitting the signal wire of brightness control signal 21 again along interface signal line 18 (it connects CPU11 and controller driver 15).This improves from CPU11 to the controller driver reliability of 15 image data transmission effectively.This controller driver 15 produces brightness control signal 21 according to the view data/outside light intensity of each two field picture, and backlight 17 brightness is realized appropriate control.
The method of controlling 17 brightness backlight according to the APL51 of each two field picture is disclosed in the above-described embodiment, although the processing of the view data of each two field picture is not limited to the calculating of APL51.For example, can generate the histogram of the view data of each two field picture, make and control backlight 17 brightness according to this histogram.
Claims (20)
1. portable terminal comprises:
First housing;
Second housing;
Engaging mechanism, it is used for engaging movably described first housing and described second housing;
View data produces part, and it is used to produce view data;
Display panel;
Display panel drive, it is used to drive described display panel;
Backlight, it is used to illuminate described display panel; With
Driving circuit, it is used to drive described backlight;
Wherein said view data produce that part is installed on described first housing and
Described display panel, described display panel drive, described driving circuit backlight and described are installed on described second housing;
Described display panel drive is via running through the signal wire that described engaging mechanism extends, divide reception described view data from described view data generating unit, the view data that receives with response drives described display panel, and the brightness control signal that will be used to control described backlight illumination simultaneously offers described driving circuit.
2. according to the portable terminal of claim 1, wherein
Described display panel drive responds described view data and produces described brightness control signal.
3. according to the portable terminal of claim 1, further comprise:
External light sensor is used for producing the external light intensity signal according to outside light intensity; Wherein
Described display panel drive responds described external light intensity signal and produces described brightness control signal.
4. according to the portable terminal of claim 3, wherein
Described external light sensor is installed on described second housing.
5. according to the portable terminal of claim 3, wherein
The described display panel drive further described view data of response produces described brightness control signal.
6. according to the portable terminal of claim 5, wherein
Described display panel drive comprises:
The brightness of image data generating circuit, it is connected and receives described view data, to produce the brightness of image data that have high value for brighter image;
The exterior light brightness data produces circuit, and it is connected to described sensor, has exterior light brightness data than low value to produce higher-strength for described exterior light;
Backlight brightness data produces circuit, it is connected to described brightness of image data generating circuit and described exterior light brightness data produces circuit, by from described brightness of image data, deducting the surplus portion that described exterior light brightness data obtains, produce the backlight brightness data of the described brightness backlight of indication with response; With
Brightness control signal produces circuit, and it is connected to described backlight brightness data and produces circuit, produces described brightness control signal to respond described backlight brightness data.
7. display panel drive comprises:
Display panel, drive circuit, the view data that its response receives from the outside drives display panel; With
Intednsity circuit, it is provided with to such an extent that be adjacent to described driving circuit, and to produce brightness control signal, this brightness control signal is used to illuminate the brightness backlight of described display panel in order to control.
8. according to the display panel drive of claim 7, wherein
Described intednsity circuit responds described view data control brightness backlight.
9. according to the display panel drive of claim 7, wherein
Described intednsity circuit receives external light intensity signal according to outside light intensity from external light sensor, and responds described external light intensity signal and produce described brightness control signal.
10. according to the display panel drive of claim 9, wherein
The described intednsity circuit further described view data of response produces described brightness control signal.
11. according to the display panel drive of claim 10, wherein
Described intednsity circuit comprises:
The brightness of image data generating circuit, it is connected to receive described view data, to produce the brightness of image data that have high value for brighter image;
The exterior light brightness data produces circuit, and it is connected to described sensor, has exterior light brightness data than low value to produce higher-strength for described exterior light;
Backlight brightness data produces circuit, it is connected to described brightness of image data generating circuit and described exterior light brightness data produces circuit, by from described brightness of image data, deducting the surplus portion that described exterior light brightness data obtains, produce the backlight brightness data of the described brightness backlight of indication with response; With
Brightness control signal produces circuit, and it is connected to described backlight brightness data and produces circuit, produces described brightness control signal to respond described backlight brightness data.
12. according to the portable terminal of claim 1, wherein
Described display panel drive comprises a plurality of electric terminals that are used to provide described brightness control signal.
13. according to the portable terminal of claim 12, wherein
Described display panel drive is suitable for selecting electric terminal from described a plurality of electric terminals, and brightness control signal is offered described driving circuit.
14. according to the portable terminal of claim 13, wherein
Described display panel drive is suitable for selecting electric terminal from described a plurality of electric terminals, and the signal wire that makes described signal wire and being used to transmit described brightness control signal does not intersect, and brightness control signal is offered described driving circuit.
15. according to the portable terminal of claim 12, wherein
Described a plurality of electric terminal is arranged on via it and transmits on the both sides of described signal wire of described view data.
16. according to the portable terminal of claim 13, wherein
Described display panel drive is suitable for selecting electric terminal according to the layout of the expectation of described driving circuit from described a plurality of electric terminals.
17. according to the display panel drive of claim 7, wherein
Described display panel drive is formed an encapsulation, and described intednsity circuit comprises a plurality of electric terminals that are used for described brightness control signal is sent to the outside of described encapsulation.
18. according to the display panel drive of claim 17, wherein
Described display panel drive is selected electric terminal from described a plurality of electric terminals, and described brightness control signal is sent to the outside from an electric terminal of selecting.
19. according to the display panel drive of claim 17, wherein
Described a plurality of electric terminal is set on the both sides of input terminal of described view data.
20. the display panel drive according to claim 7 comprises:
A plurality of electric terminals, it is used for described brightness control signal is outputed to the outside.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006233260 | 2006-08-30 | ||
| JP2006233260 | 2006-08-30 | ||
| JP2007183870 | 2007-07-13 |
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| Publication Number | Publication Date |
|---|---|
| CN101135792A true CN101135792A (en) | 2008-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101471774A Pending CN101135792A (en) | 2006-08-30 | 2007-08-30 | Mobile terminal and display panel driver |
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| Country | Link |
|---|---|
| CN (1) | CN101135792A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101751866A (en) * | 2008-12-16 | 2010-06-23 | 恩益禧电子股份有限公司 | Backlight brightness control for panel display device |
| CN102595177A (en) * | 2012-02-22 | 2012-07-18 | 青岛海信电器股份有限公司 | Method for achieving 3D (three-dimensional) image display and liquid crystal display television |
| CN101557430B (en) * | 2008-04-10 | 2012-12-12 | Lg电子株式会社 | Mobile terminal and screen control method thereof |
| CN104217704A (en) * | 2014-08-26 | 2014-12-17 | 小米科技有限责任公司 | Backlight brightness control method and device |
| CN104935694A (en) * | 2015-06-15 | 2015-09-23 | 上海鼎讯电子有限公司 | Mobile terminal |
| CN109752876A (en) * | 2018-12-01 | 2019-05-14 | 华为机器有限公司 | A kind of display screen and terminal |
| WO2019100990A1 (en) * | 2017-11-22 | 2019-05-31 | Oppo广东移动通信有限公司 | Electronic device |
| CN111272200A (en) * | 2020-02-07 | 2020-06-12 | 北京字节跳动网络技术有限公司 | Output value adjusting method and device and electronic equipment |
| CN115394267A (en) * | 2022-09-23 | 2022-11-25 | 北京显芯科技有限公司 | Display system |
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- 2007-08-30 CN CNA2007101471774A patent/CN101135792A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557430B (en) * | 2008-04-10 | 2012-12-12 | Lg电子株式会社 | Mobile terminal and screen control method thereof |
| CN101751866A (en) * | 2008-12-16 | 2010-06-23 | 恩益禧电子股份有限公司 | Backlight brightness control for panel display device |
| CN101751866B (en) * | 2008-12-16 | 2014-06-25 | 瑞萨电子株式会社 | Backlight brightness control for panel display device |
| CN102595177A (en) * | 2012-02-22 | 2012-07-18 | 青岛海信电器股份有限公司 | Method for achieving 3D (three-dimensional) image display and liquid crystal display television |
| CN104217704A (en) * | 2014-08-26 | 2014-12-17 | 小米科技有限责任公司 | Backlight brightness control method and device |
| CN104935694A (en) * | 2015-06-15 | 2015-09-23 | 上海鼎讯电子有限公司 | Mobile terminal |
| WO2019100990A1 (en) * | 2017-11-22 | 2019-05-31 | Oppo广东移动通信有限公司 | Electronic device |
| US11196854B2 (en) | 2017-11-22 | 2021-12-07 | Shenzhen Heytap Technology Corp., Ltd. | Electronic device |
| CN109752876A (en) * | 2018-12-01 | 2019-05-14 | 华为机器有限公司 | A kind of display screen and terminal |
| CN111272200A (en) * | 2020-02-07 | 2020-06-12 | 北京字节跳动网络技术有限公司 | Output value adjusting method and device and electronic equipment |
| CN115394267A (en) * | 2022-09-23 | 2022-11-25 | 北京显芯科技有限公司 | Display system |
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Application publication date: 20080305 |