WO2007058018A1 - 液晶表示装置およびその駆動方法 - Google Patents
液晶表示装置およびその駆動方法 Download PDFInfo
- Publication number
- WO2007058018A1 WO2007058018A1 PCT/JP2006/318957 JP2006318957W WO2007058018A1 WO 2007058018 A1 WO2007058018 A1 WO 2007058018A1 JP 2006318957 W JP2006318957 W JP 2006318957W WO 2007058018 A1 WO2007058018 A1 WO 2007058018A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sampling
- signal
- liquid crystal
- display mode
- signal line
- Prior art date
Links
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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0294—Details of sampling or holding circuits arranged for use in a driver for data electrodes
-
- 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
- G09G2310/04—Partial updating of the display 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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
-
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
Definitions
- Liquid crystal display device and driving method thereof Liquid crystal display device and driving method thereof
- the present invention relates to a liquid crystal display device and a driving method thereof, and more particularly to a liquid crystal display device having a partial display function and a driving method thereof.
- Some liquid crystal display devices have a function of performing display on a part of a screen (hereinafter referred to as partial display).
- Partial display is used, for example, to display the reception status and time of radio waves on a part of the screen while waiting on a mobile phone (see Fig. 10).
- the video signal is written to the display element in the set display area, but the video signal is not written to the display element in the non-display area.
- the drive frequency of the display element can be reduced and the power consumption of the liquid crystal display device can be reduced.
- the partial display is disclosed in Patent Documents 1 and 2, for example.
- FIG. 11 is a diagram showing a configuration of a conventional liquid crystal display device having a partial display function.
- the pixel array 84 includes (!!!!) display elements! 3 , n scanning signal lines G l to Gn, and m data signal lines Sl to Sm.
- the scanning signal line drive circuit 82 selectively activates the scanning signal lines Gl to Gn in order based on the control signals (GSP, GEN, GCK1, GCK2) output from the display control unit 81.
- the line driving circuit 83 drives the data signal lines Sl to Sm based on the control signals (SSP, SCK, SCKB) output from the display control unit 81 and the video signal VD.
- the display control unit 81 controls the gate enable signal GEN to a low level during a non-display period (a period corresponding to a non-display area).
- the scanning signal line driving circuit 82 does not activate any scanning signal line when the gate enable signal GEN is at a low level. Therefore, while the gate enable signal GEN is at the low level, the video signal VD is not written to the misaligned display element P! /.
- FIG. 12 is a diagram showing a detailed configuration of the data signal line drive circuit 83.
- Data signal line The drive circuit 83 includes a flip-flop 91 and a sampling unit 92 corresponding to each of the data signal lines Sl to Sm.
- the flip-flops 91 are connected in series to form a shift register. Output signal power of shift register Sampling signals SMPl to SMPm for data signal lines Sl to Sm.
- the sampling unit 92 includes a plurality of inverters 93 and sampling switches 94.
- the inverter 93 is also connected in series with the power having a small driving capability. Sampling signals SMP 1 to SMPm that have passed through the inverter 93 are applied to the control terminal of the sampling switch 94.
- the sampling switch 94 switches whether to apply the video signal VD to the data signal lines Sl to Sm based on the sampling signal given to the control terminal.
- the reason why the inverter 93 is provided in the sampling unit 92 is that the sampling switch 94 cannot be switched at a desired speed by the driving capability of the flip-flop 91.
- Patent Document 1 Japanese Patent Application Laid-Open No. 11-184434
- Patent Document 2 Japanese Unexamined Patent Publication No. 2002-99262
- the partial display described above is mainly performed by an electronic device (for example, a mobile phone) whose power consumption is strictly demanded. For this reason, it is necessary to reduce the power consumption of the liquid crystal display device as much as possible.
- the number of display elements included in the liquid crystal display device continues to increase. As the number of display elements increases, the power consumption of the liquid crystal display device increases because (1) the number of sampling units increases and (2) the sampling units operate faster.
- an object of the present invention is to reduce power consumption of a liquid crystal display device when performing partial display.
- a first aspect of the present invention is a liquid crystal display device having a partial display function, which is common to a plurality of display elements arranged in a row direction and a column direction, and a display element arranged in the same row.
- a pixel array including a plurality of scanning signal lines connected to each other and a plurality of data signal lines connected in common to display elements arranged in the same column;
- a scanning signal line driving circuit for selectively activating the scanning signal lines
- a data signal line driving circuit for driving the data signal line based on a given video signal
- the data signal line driving circuit includes:
- a shift register that outputs a sampling signal for each of the data signal lines, and first and second output terminals. In the normal display mode, the sampling signal output from the shift register is at least from the first output terminal.
- a selection circuit that outputs and outputs from the second output terminal in the partial display mode;
- a first sampling unit that samples the video signal based on the sampling signal output from the first output terminal and applies the sampled signal to the data signal line;
- a second sampling unit that samples the video signal based on the sampling signal output from the second output terminal and applies the sampled video signal to the data signal line.
- a second aspect of the present invention is the first aspect of the present invention
- the second sampling unit has a circuit configuration that operates at a lower speed than the first sampling unit.
- a third aspect of the present invention is the second aspect of the present invention.
- the first sampling unit includes:
- a first notch unit to which the sampling signal output from the first output terminal is input;
- the video signal is also output from the first buffer unit.
- the second sampling unit includes:
- a second notch unit to which the sampling signal output from the second output terminal is input;
- a second sampling switch for switching whether to apply the video signal to the data signal line based on the sampling signal output from the second buffer unit
- the driving capacity of the second buffer unit is lower than that of the first buffer unit.
- the on-resistance of the second sampling switch is larger than that of the first sampling switch.
- a fourth aspect of the present invention is the third aspect of the present invention.
- the second buffer unit is composed of a transistor having a channel width narrower than that of the first notch unit,
- the second sampling switch is configured by a transistor having a channel width narrower than that of the first sampling switch.
- the selection circuit does not output the sampling signal output from the shift register from the second output terminal but outputs the first output terminal force.
- a sixth aspect of the present invention provides, in the first aspect of the present invention,
- the selection circuit In the normal display mode, the selection circuit outputs the sampling signal output from the shift register from the first and second output terminals.
- a seventh aspect of the present invention is the first aspect of the present invention.
- the scanning signal line drive circuit switches the scanning signal line to be activated every first line time, and in the display period in the partial display mode, the scanning signal line driving circuit activates the scanning signal line to the first line.
- the shift register operates at the first sampling period in the normal display mode and switches at every second line time longer than the time.
- the display period in the partial display mode operates in a second sampling period longer than the first sampling period.
- sampling is performed using the first sampling unit (or the first and second sampling units), and the partial display is performed.
- sampling is performed using a second sampling unit different from the first sampling unit.
- sampling is performed using the first sampling unit (or the first and second sampling units), and the partial display mode is performed.
- sampling is performed using the second sampling unit that operates at a lower speed than the first sampling unit.
- the first sampling unit and the second sampling unit are provided with a difference in the characteristics of the buffer unit and the sampling switch, whereby the first sampling unit and the second sampling unit are differentiated. It is possible to obtain a liquid crystal display device having a second sampling unit that operates at a lower speed than the sampling unit.
- the channel width of the transistors constituting the buffer unit and the sampling switch is made different between the first sampling unit and the second sampling unit.
- a liquid crystal display device including a second sampling unit that operates at a lower speed than the first sampling unit.
- the first sampling unit and the second sampling unit always operate exclusively, so that the design and evaluation of the liquid crystal display device can be easily performed. it can.
- the capability of the first sampling unit can be designed to be low.
- one line time and sampling period are longer than in the normal display mode, and the video signal is longer than in the normal display mode. It changes at a slow speed. Therefore, the correct sampling operation can be ensured even in the partial display mode in which the second sampling unit operates.
- FIG. 1 is a block diagram showing a configuration of a liquid crystal display device according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a detailed configuration of a data signal line driving circuit included in the liquid crystal display device shown in FIG.
- FIG. 3A is a circuit diagram of a first configuration example of a selection circuit included in the data signal line drive circuit shown in FIG.
- FIG. 3B is a diagram showing a truth table of the selection circuit shown in FIG. 3A.
- FIG. 4A is a circuit diagram of a second configuration example of a selection circuit included in the data signal line drive circuit shown in FIG.
- FIG. 4B is a diagram showing a truth table of the selection circuit shown in FIG. 4A.
- FIG. 5C is a circuit diagram of a third configuration example of a selection circuit included in the data signal line driving circuit shown in FIG.
- FIG. 5B is a diagram showing a truth table of the selection circuit shown in FIG. 5A.
- FIG. 10 is a diagram showing an example of a display screen by partial display.
- FIG. 11 is a block diagram showing a configuration of a conventional liquid crystal display device.
- FIG. 1 is a block diagram showing a configuration of a liquid crystal display device according to an embodiment of the present invention.
- a liquid crystal display device 10 shown in FIG. 1 includes a display control unit 11, a scanning signal line driving circuit 12, a data signal line driving circuit 13, and a pixel array 14.
- the liquid crystal display device 10 is supplied with a mode selection signal MSEL indicating the normal display mode or the partial display mode.
- the liquid crystal display device 10 displays on the entire screen in the normal display mode, and displays on a part of the screen in the partial display mode.
- the pixel array 14 includes (m X n) display elements P, n scanning signal lines Gl to Gn, and m data signal lines Sl to Sm. (!!! The number of display elements? Is arranged in m in the row direction and n in the column direction.
- the scanning signal lines Gl to Gn are common to the display elements P in the same row.
- the data signal lines Sl to Sm are connected in common to the display elements P arranged in the same column.
- the pixel array 14 is formed on a liquid crystal panel.
- all or part of the scanning signal line driving circuit 12 and the data signal line driving circuit 13 are formed monolithically. Further, a part of the display control unit 11 may be monolithically formed on the liquid crystal panel.
- the display control unit 11 outputs a control signal to the scanning signal line drive circuit 12 and the data signal line drive circuit 13 and outputs a video signal VD to the data signal line drive circuit 13. More specifically, the display control unit 11 outputs a gate start pulse GSP, gate clocks GCK1 and GCK2, and a gate enable signal GEN to the scanning signal line drive circuit 12, and a data signal line drive circuit. In response to 13, output source start pulse S SP, source clock SCK, SCKB (negative signal of SCK), partial display control signal PA TCTL, and video signal VD.
- the gate start pulse GSP is a signal indicating the head of one frame, and becomes a predetermined level (hereinafter referred to as a high level) for a predetermined time at a rate of once per frame time.
- the gate clocks GCK1 and GCK2 are signals indicating the head of one line, and change in a predetermined direction (hereinafter referred to as a rising direction) at a rate of once every two lines.
- the gate enable signal GEN is a signal that indicates whether or not display is performed for each line. In the normal display mode and the display period in the partial display mode (period corresponding to the display area), a predetermined value ( Hereafter, it is referred to as “no” and “i” level.
- the source start pulse SSP is a signal indicating the head of one line, and is at a predetermined level (hereinafter referred to as high level) for one cycle per line time.
- the source clock SCK is a clock signal having a cycle of 2 cycles.
- the partial display control signal PATCTL is the same signal as the mode selection signal MSEL.
- the video signal VD changes in synchronization with the rising and falling edges of the source clock SCK.
- the scanning signal line drive circuit 12 selectively activates the scanning signal lines Gl to Gn in order based on the control signal output from the display control unit 11. More specifically, the scanning signal line drive circuit 12 activates the scanning signal line G1 by applying a predetermined potential to the scanning signal line G1 in one line time immediately after the gate start pulse GSP is output. To do. Thereafter, the scanning signal line drive circuit 12 switches the scanning signal line to be activated in the order of G2, G3,..., Gn every time the gate clock GCK1 or GCK2 rises. However, when the gate enable signal GEN is at a low level, the scanning signal line drive circuit 12 does not activate any scanning signal line.
- the data signal line driving circuit 13 drives the data signal lines Sl to Sm based on the control signal and the video signal VD output from the display control unit 11.
- the data signal line driving circuit 13 has the following circuit configuration.
- FIG. 2 is a diagram showing a detailed configuration of the data signal line driving circuit 13.
- the data signal line drive circuit 13 includes a flip-flop 21, a selection circuit 22, a first sampling unit 23, and a second sampling unit 24 corresponding to each of the data signal lines Sl to Sm. .
- a flip-flop 21 flip-flop 21
- a selection circuit 22 selects the data signal lines Sl to Sm.
- a second sampling unit 24 corresponding to each of the data signal lines Sl to Sm.
- the data signal line drive circuit 13 includes a total of m flip-flops 21.
- the m flip-flops 21 are connected in series so that the output of the previous stage becomes the input of the next stage, thereby forming an m-stage shift register.
- the shift register receives source clocks SCK and SCKB as clock inputs and a source start pulse SSP as serial data inputs.
- the flip-flop 21 stores the output signal (or source start pulse SSP) of the preceding flip-flop 21 when the source clock SCK or SCKB changes.
- the output signal of the i-th flip-flop 21 (i is an integer of 1 to m) is referred to as a sampling signal Qi. Sampling signal Q1 goes high for the first two cycles of a line time.
- Sampling signal Q2 rises to the high level for two cycles with the rising edge of sampling signal Q1 also delayed by one cycle. Similarly, the sampling signal Qi goes high for two cycles, one cycle behind the rising edge of the sampling signal Qi-1 (see Fig. 6 and Fig. 7 described later).
- the selection circuit 22, the first sampling unit 23, and the second sampling unit 24 provided corresponding to the data signal lines Sl to Sm have the same circuit configuration.
- the selection circuit 22, the first sampling unit 23, and the second sampling unit 24 provided corresponding to the data signal line Si will be described.
- the selection circuit 22 receives the sampling signal Qi and the partial display control signal PATCTL.
- the partial display control signal PATCTL is low in the normal display mode and high in the partial display mode.
- the selection circuit 22 has a first output terminal connected to the first sampling unit 23 and a second output terminal connected to the second sampling unit 24.
- the selection circuit 22 outputs the sampling signal Qi from the first output terminal in the normal display mode, and outputs the sampling signal Qi from the second output terminal in the partial display mode.
- the selection circuit 22 may output the sampling signal Qi from both the first and second output terminals in the normal display mode.
- FIGS. 3A, 4A, and 5A are circuit diagrams of first to third configuration examples of the selection circuit 22, respectively, and FIGS. 3B, 4B, and 5B are FIGS. 3A and 4A, respectively.
- FIG. 5B is a diagram showing a truth table of the selection circuit shown in FIG. 5A.
- the sampling signal that also outputs the first output terminal force of the selection circuit 22 is referred to as the first sampling signal SMP-Li
- the sampling signal output from the second output terminal of the selection circuit 22 is the second sampling signal.
- the selection circuit 22a shown in FIG. 3A includes an inverter, two analog switches, and two N-type MOS transistors.
- the selection circuit 22a outputs the sampling signal Qi from the first output terminal when the partial display control signal PATCTL is low level, and outputs the sampling signal Qi as the second output when the partial display control signal PATCTL is high level. Output from the power terminal (see Figure 3B).
- the selection circuit 22b shown in FIG. 4A includes an inverter and two AND gates.
- the selection circuit 22b outputs the sampling signal Qi from the first output terminal when the partial display control signal PATCTL is at the same level, and the sampling signal when the partial display control signal PATCTL is at the high level.
- Qi is output from the second output terminal (see Figure 4B).
- the selection circuit 22c shown in FIG. 5A includes an inverter and an AND gate.
- the selection circuit 22c outputs the sampling signal Qi from both the first and second output terminals when the partial display control signal PATCTL is low level, and the sampling signal when the partial display control signal PAT CTL is high level. Qi is output from the second output terminal (see Figure 5B).
- FIG. 6 is a timing chart of the data signal line driving circuit 13 including the selection circuit 22a or 22b.
- the first sampling signal SMP-Li is output based on the sampling signal Qi.
- the second sampling signal SMP-Si is output based on the sampling signal Qi.
- FIG. 7 is a timing chart of the data signal line drive circuit 13 including the selection circuit 22c. As shown in FIG. 7, in the normal display mode, the first sampling signal SMP-Li and the second sampling signal SMP-Si are output based on the sampling signal Qi. In the normal display mode, the second sampling signal SMP-Si is output based on the sampling signal Qi.
- the first sampling unit 23 samples the video signal V D based on the first sampling signal SMP—Li and applies it to the data signal line Si.
- the second sampling unit 24 samples the video signal VD based on the second sampling signal SMP-Si and applies it to the data signal line Si.
- the selection circuit 22 switches the output destination of the sampling signal Qi in accordance with the partial display control signal PATCTL. Therefore, the selection circuit 22 type and Depending on the display control signal PATCTL, the first sampling unit 23 and the second sampling unit 24 may or may not operate.
- FIG. 8 is a table showing operating states of the first sampling unit 23 and the second sampling unit 24.
- the selection circuit 22a or 22b is used as the selection circuit 22
- the partial display control signal PATCTL when the partial display control signal PATCTL is at the low level, the first sampling unit 23 operates and the partial display control signal When PATCTL is high, the second sampling unit 24 operates.
- the selection circuit 22c when the partial display control signal PATCTL is at a low level, the first sampling unit 23 and the second sampling unit 24 operate, and the partial display control signal When PATCTL is high, the second sampling unit 24 operates.
- the first sampling unit 23 includes a plurality of inverters 31 and a sampling switch 32.
- Sampling switch 32 is an analog switch that also has the power of a P-type MOS transistor and an N-type MOS transistor.
- the video signal VD is given to one conduction terminal of the sampling switch 32, and the other conduction terminal is connected to the data signal line Si.
- the inverters 31 are divided into two groups, and the inverters 31 belonging to each group are connected in series.
- the inverter 31 connected in series functions as a notch unit. More specifically, the inverters 31 are connected in order from the narrowest channel width of the built-in MOS transistors (that is, from the smallest in driving capability).
- the first sampling signal SMP—Li is input to the first inverter 31.
- the control terminal of the sampling switch 32 is supplied with the first sampling signal SMP—Li that has passed through the last inverter 31.
- the first sampling unit 23 may include another circuit having a noffer function (for example, a buffer for non-inverted output of the input signal) instead of the inverter 31! /
- the sampling switch 32 When the first sampling signal SMP-Li is at the noise level, the sampling switch 32 is turned on, and the video signal VD is applied to the data signal line Si. On the other hand, when the first sampling signal SMP Li is at a low level, the sampling switch 32 is turned off. Therefore, the video signal VD is not applied to the data signal line Si. In this way, the sampling switch 32 applies the video signal VD to the data signal line Si based on the sampling signal (first sampling signal SMP—Li that has passed through the plurality of notfers 31) given to the control terminal. Toggles whether or not it is correct.
- the second sampling unit 24 includes a plurality of inverters 41 and a sampling switch 42! /.
- the connection form of the inverter 41 and the sampling switch 42 is the same as that of the first sampling unit 23.
- the inverter 41 connected in series functions as a noffer section.
- the sampling switch 42 switches whether or not the video signal VD is applied to the data signal line Si based on the second sampling signal SMP-Si that has passed through the plurality of inverters 41.
- the second sampling unit 24 is different from the first sampling unit 23 in the following points.
- the sampling switch 42 has a narrower channel width than the sampling switch 32, and is configured using a MOS transistor. Therefore, the on-resistance of the sampling switch 42 is larger than that of the sampling switch 32.
- the inverter 41 is configured using a MOS transistor having a channel width narrower than that of the inverter 31. For this reason, the drive capability of the inverter 41 is lower than that of the inverter 31, and the drive capability of the buffer circuit configured by the inverter 41 is lower than that of the buffer circuit configured by the inverter 31. Due to the above differences in circuit configuration, the second sampling unit 24 operates at a lower speed than the first sampling unit 23.
- the liquid crystal display device 10 has a display period in the partial display mode that is longer than that in the normal display mode, as shown below.
- a method is used in which the length of one line and the sampling cycle are lengthened, and the time of one line is shortened in the non-display period in the partial display mode than in the normal display mode.
- FIG. 9 is a timing chart of output signals of the display control unit 11.
- one line time T1
- the scanning signal line drive circuit 12 switches the scanning signal line to be activated every line time T1.
- the scanning signal line driving circuit 12 switches the scanning signal line to be activated every time T2 longer than one line time T1.
- one line time in the liquid crystal display device 10 is Tl in the normal display mode, ⁇ 2 ( ⁇ 2> ⁇ 1) in the display period in the partial display mode, and ⁇ 3 (in the non-display period in the partial display mode.
- (3) T1) (hereinafter, this time is referred to as TO).
- the 1-line time TO is the reference for the timing at which the source start pulse SSP, source clock SCK, SCKB, and video signal VD change.
- the cycle in which the video signal VD changes, and the length of one cycle corresponding to the half cycle of the source clock SCK is determined based on one line time TO.
- the shift register composed of the flip-flop 21 operates at a slower speed (at a speed T1ZT2 times) in the display period in the partial display mode than in the normal display mode.
- the flip-flop operates in the first sampling period in the normal display mode, and operates in the second sampling period longer than the first sampling period in the partial display mode.
- the video signal VD changes at a slower speed (at a speed of T1ZT2 times) in the display period in the partial display mode than in the normal display mode.
- Tl X n T2 X a + T3 X (n-a)...
- the gate enable signal GEN is at a low level, the video signal VD is not written to any display element P. Therefore, in the non-display period in the partial display mode, even if one line time T3 is shorter than the one line time T1 in the normal display mode, there is no problem in the screen display.
- the data signal line driving circuit 83 performs the same operation in both the normal display mode and the partial display mode. Therefore, the power consumption in the data signal line driving circuit 83 is the same in both the normal display mode and the partial display mode.
- the first sampling unit 23 (or the first sampling unit 23 and the second sampling unit 24) In contrast, the second sampling unit 24 operates in the partial display mode.
- the sampling switch 32 consumes little power, but the inverter 31 consumes power with the change of the sampling signal Qi.
- the sampling switch 42 consumes little power, but the inverter 41 consumes power with the change of the sampling signal Qi.
- the inverter 41 is configured using a MOS transistor having a narrower channel width than the inverter 31, the power consumption in the inverter 41 is smaller than that of the inverter 31. Therefore, the power consumption in the second sampling unit 24 is smaller than that in the first sampling unit 23.
- the second sampling unit 24, which consumes less power than the first sampling unit 23, operates in the partial display mode. Therefore, according to the liquid crystal display device 10, it is possible to reduce power consumption when performing partial display as compared with the conventional liquid crystal display device.
- the normal display mode like the selection circuit 22c, if the selection circuit 22 that outputs the sampling signal Qi to both the first sampling unit 23 and the second sampling unit 24 is used, the normal display mode is used. Since the two sampling units operate in parallel, the capacity of the first sampling unit 23 can be designed low.
- the liquid crystal display device can be configured by suitably designing the display control unit 11.
- the liquid crystal display device may have a smaller frame rate (number of display frames per unit time) in the partial display mode than in the normal display mode.
- the liquid crystal display device writes video signals to the display elements in the display area at predetermined time intervals, and the display elements in the non-display area at longer time intervals. A video signal may be written.
- the liquid crystal display device may display a screen based on a multi-value video signal in the normal display mode, and may display a screen based on a binary video signal in the partial display mode.
- the liquid crystal display device may use an operational amplifier when generating a multi-value video signal, and may use a switch connected to two types of power supply voltages when generating a binary video signal. According to these liquid crystal display devices, power consumption when performing partial display can be further reduced.
- the liquid crystal display device performs sampling by using the first sampling unit (or the first and second sampling units) and performs partial display.
- sampling is performed using a second sampling unit that is different from the first sampling unit. Therefore, the liquid crystal display device according to the present embodiment has lower power consumption when performing partial display than the conventional liquid crystal display device. Can be reduced.
- the liquid crystal display device of the present invention has an effect of reducing power consumption when performing partial display, it can be used for display devices of various devices such as a mobile phone, an information processing terminal, and a personal computer.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800422280A CN101305415B (zh) | 2005-11-16 | 2006-09-25 | 液晶显示装置及其驱动方法 |
JP2007545170A JP4762251B2 (ja) | 2005-11-16 | 2006-09-25 | 液晶表示装置およびその駆動方法 |
US12/084,763 US20090109203A1 (en) | 2005-11-16 | 2006-09-25 | Liquid Crystal Display Device and Method for Driving the Same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005331483 | 2005-11-16 | ||
JP2005-331483 | 2005-11-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007058018A1 true WO2007058018A1 (ja) | 2007-05-24 |
Family
ID=38048410
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/318957 WO2007058018A1 (ja) | 2005-11-16 | 2006-09-25 | 液晶表示装置およびその駆動方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090109203A1 (ja) |
JP (1) | JP4762251B2 (ja) |
CN (1) | CN101305415B (ja) |
WO (1) | WO2007058018A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007058202A (ja) * | 2005-07-29 | 2007-03-08 | Semiconductor Energy Lab Co Ltd | 表示装置及びその駆動方法 |
US9047822B2 (en) | 2005-07-29 | 2015-06-02 | Semiconductor Energy Laboratory Co., Ltd. | Display device where supply of clock signal to driver circuit is controlled |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9826165B2 (en) * | 2012-06-11 | 2017-11-21 | Sony Corporation | Control device, control method, and recording medium |
US8836679B2 (en) * | 2012-08-06 | 2014-09-16 | Au Optronics Corporation | Display with multiplexer feed-through compensation and methods of driving same |
KR20150024073A (ko) * | 2013-08-26 | 2015-03-06 | 삼성전자주식회사 | 디스플레이 구동 및 부분 디스플레이 장치와 방법 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0575957A (ja) * | 1991-09-11 | 1993-03-26 | Hitachi Ltd | サンプルホールド回路、それを用いた水平走査回路、及び該走査回路を含むマトリクス型表示装置 |
JPH08331486A (ja) * | 1995-06-02 | 1996-12-13 | Matsushita Electric Ind Co Ltd | 画像表示装置 |
JPH09101764A (ja) * | 1995-10-06 | 1997-04-15 | Matsushita Electron Corp | マトリクス型映像表示装置の駆動方法 |
JP2000098982A (ja) * | 1998-09-28 | 2000-04-07 | Seiko Epson Corp | 電気光学装置の駆動回路及び電気光学装置並びに電気光学装置の駆動方法 |
JP2004029300A (ja) * | 2002-06-25 | 2004-01-29 | Toshiba Corp | 表示装置 |
JP2004309846A (ja) * | 2003-04-08 | 2004-11-04 | Seiko Epson Corp | 電気光学装置及びその駆動方法、並びに電子機器 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000206491A (ja) * | 1999-01-11 | 2000-07-28 | Sony Corp | 液晶表示装置 |
JP2001109436A (ja) * | 1999-10-08 | 2001-04-20 | Oki Electric Ind Co Ltd | マトリクス型表示装置 |
JP3822060B2 (ja) * | 2000-03-30 | 2006-09-13 | シャープ株式会社 | 表示装置用駆動回路、表示装置の駆動方法、および画像表示装置 |
TWI282956B (en) * | 2000-05-09 | 2007-06-21 | Sharp Kk | Data signal line drive circuit, and image display device incorporating the same |
JP2002196701A (ja) * | 2000-12-22 | 2002-07-12 | Semiconductor Energy Lab Co Ltd | 表示装置の駆動回路及び表示装置の駆動方法 |
JP2002287710A (ja) * | 2001-03-28 | 2002-10-04 | Sony Corp | 液晶表示装置、カメラシステムおよび携帯端末装置 |
JP3791452B2 (ja) * | 2002-05-02 | 2006-06-28 | ソニー株式会社 | 表示装置およびその駆動方法、ならびに携帯端末装置 |
JP3783686B2 (ja) * | 2003-01-31 | 2006-06-07 | セイコーエプソン株式会社 | 表示ドライバ、表示装置及び表示駆動方法 |
JP4105132B2 (ja) * | 2003-08-22 | 2008-06-25 | シャープ株式会社 | 表示装置の駆動回路、表示装置および表示装置の駆動方法 |
JP4494050B2 (ja) * | 2004-03-17 | 2010-06-30 | シャープ株式会社 | 表示装置の駆動装置、表示装置 |
JP4510530B2 (ja) * | 2004-06-16 | 2010-07-28 | 株式会社 日立ディスプレイズ | 液晶表示装置とその駆動方法 |
CN100474390C (zh) * | 2004-12-09 | 2009-04-01 | 友达光电股份有限公司 | 控制装置及方法以及应用该控制装置的显示器 |
-
2006
- 2006-09-25 JP JP2007545170A patent/JP4762251B2/ja not_active Expired - Fee Related
- 2006-09-25 US US12/084,763 patent/US20090109203A1/en not_active Abandoned
- 2006-09-25 WO PCT/JP2006/318957 patent/WO2007058018A1/ja active Application Filing
- 2006-09-25 CN CN2006800422280A patent/CN101305415B/zh not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0575957A (ja) * | 1991-09-11 | 1993-03-26 | Hitachi Ltd | サンプルホールド回路、それを用いた水平走査回路、及び該走査回路を含むマトリクス型表示装置 |
JPH08331486A (ja) * | 1995-06-02 | 1996-12-13 | Matsushita Electric Ind Co Ltd | 画像表示装置 |
JPH09101764A (ja) * | 1995-10-06 | 1997-04-15 | Matsushita Electron Corp | マトリクス型映像表示装置の駆動方法 |
JP2000098982A (ja) * | 1998-09-28 | 2000-04-07 | Seiko Epson Corp | 電気光学装置の駆動回路及び電気光学装置並びに電気光学装置の駆動方法 |
JP2004029300A (ja) * | 2002-06-25 | 2004-01-29 | Toshiba Corp | 表示装置 |
JP2004309846A (ja) * | 2003-04-08 | 2004-11-04 | Seiko Epson Corp | 電気光学装置及びその駆動方法、並びに電子機器 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007058202A (ja) * | 2005-07-29 | 2007-03-08 | Semiconductor Energy Lab Co Ltd | 表示装置及びその駆動方法 |
US9047822B2 (en) | 2005-07-29 | 2015-06-02 | Semiconductor Energy Laboratory Co., Ltd. | Display device where supply of clock signal to driver circuit is controlled |
Also Published As
Publication number | Publication date |
---|---|
US20090109203A1 (en) | 2009-04-30 |
CN101305415B (zh) | 2011-06-22 |
JP4762251B2 (ja) | 2011-08-31 |
CN101305415A (zh) | 2008-11-12 |
JPWO2007058018A1 (ja) | 2009-04-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4593071B2 (ja) | シフトレジスタおよびそれを備えた表示装置 | |
US7274351B2 (en) | Driver circuit and shift register of display device and display device | |
KR101126487B1 (ko) | 액정표시장치의 데이터 구동 장치 및 방법 | |
JP6248268B2 (ja) | 画像表示装置 | |
KR101096693B1 (ko) | 쉬프트 레지스터와 이를 이용한 액정표시장치 | |
US9881542B2 (en) | Gate driver on array (GOA) circuit cell, driver circuit and display panel | |
KR101533221B1 (ko) | 액티브 매트릭스형 표시장치 | |
KR20110139664A (ko) | 구동 회로, 액정 표시 장치, 및 전자 정보 기기 | |
US20090115771A1 (en) | Liquid Crystal Display Device and Method for Driving Same | |
JP2009128776A (ja) | ドライバ及び表示装置 | |
JP3958271B2 (ja) | レベルシフタ及びそれを用いた表示装置 | |
JP3705985B2 (ja) | シフトレジスタ、および、それを用いた画像表示装置 | |
JP4762251B2 (ja) | 液晶表示装置およびその駆動方法 | |
JPH1165536A (ja) | 画像表示装置、画像表示方法及びそれを用いた電子機器並びに投写型表示装置 | |
JP4671187B2 (ja) | アクティブマトリクス基板およびそれを用いた表示装置 | |
US8971478B2 (en) | Shift register, signal line drive circuit, liquid crystal display device | |
JP4633662B2 (ja) | 走査信号線駆動装置、液晶表示装置、ならびに液晶表示方法 | |
JP3856316B2 (ja) | シフトレジスタ回路および画像表示装置 | |
KR101198933B1 (ko) | 데이터 쉬프팅 장치 및 데이터 쉬프팅 방법 | |
JP2006154480A (ja) | 表示装置用駆動回路及びフレキシブルプリント配線板並びにアクティブマトリクス型表示装置 | |
CN112150963B (zh) | 栅极驱动电路 | |
KR100800466B1 (ko) | 칩 사이즈의 감소가 가능한 박막 트랜지스터형 액정 표시장치 드라이버 | |
JP4591664B2 (ja) | 液晶表示装置 | |
JP5260935B2 (ja) | ソース線駆動回路 | |
KR100983449B1 (ko) | 액정표시장치의 소스 드라이버 집적회로의 전력 소모를줄인 데이터 인에이블 회로 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200680042228.0 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
ENP | Entry into the national phase |
Ref document number: 2007545170 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 12084763 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 06798288 Country of ref document: EP Kind code of ref document: A1 |