CN102122497B - Liquid crystal display (LCD) drive circuit and LCD device - Google Patents
Liquid crystal display (LCD) drive circuit and LCD device Download PDFInfo
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- CN102122497B CN102122497B CN 201110073926 CN201110073926A CN102122497B CN 102122497 B CN102122497 B CN 102122497B CN 201110073926 CN201110073926 CN 201110073926 CN 201110073926 A CN201110073926 A CN 201110073926A CN 102122497 B CN102122497 B CN 102122497B
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Abstract
The invention discloses a liquid crystal display (LCD) drive circuit. The LCD drive circuit comprises a control register, a time-sequence control module, a display buffer register, a bias voltage generation module, an electrode drive module and a special automatic refresh register, wherein, the special automatic refresh register is specially used for storing the display data of display elements which are refreshed regularly. When the LCD drive circuit performs refresh tasks regularly, the special automatic refresh register loads the display data of the display elements written by a main processor into the display buffer register in a timing cycle manner under the control of a control register file and the time-sequence control module, and then transfers the data into the electrode drive module so as to generate an electrode drive signal. In the invention, the front-end main processor does not need to participate in control during the whole refresh process of the display elements to be refreshed regularly so as to prevent the main processor from being frequently waken from a dormant state for updating the display elements which are refreshed regularly, thus greatly lowering the power consumption of the front-end main processor.
Description
Technical field
The present invention relates to liquid crystal display drive circuit, particularly relate to a kind of automatically updated liquid crystal display drive circuit of display element that refreshes by regularity.
Background technology
Small liquid crystal display screen is widely used in the portable sets such as mobile phone, game machine or palm PC.These LCD Panels are generally driven by liquid crystal display drive circuit, accomplish the demonstration of displaying contents.
As shown in Figure 1, be the circuit structure diagram of liquid crystal display drive circuit in the prior art, comprise control register heap 2, time-sequence control module 3, display buffer register 4, bias voltage generation module 5 and electrode drive module 6.The display mode that the control information of the primary processor 1 of control register 2 receiving front-ends, time-sequence control module 3 provide electrode to show to electrode drive module 6 under the control action of control register 2; The video data of the primary processor 1 of display buffer register 4 receiving front-ends, and under the control of the primary processor 1 of front end, the video data that provides electrode to show to electrode drive module 6; Bias voltage module 5 receives external voltage signal V (this voltage signal is generally directly provided by external power source), produces bias voltage, and the voltage amplitude of electrode demonstration is provided to electrode drive module 6.Above-mentioned liquid crystal display drive circuit, by the control of front end primary processor, the output electrode drive signal, the electrode work of driving liquid crystal screen, thus present displaying contents.Yet for controlling above-mentioned liquid crystal display drive circuit work, the primary processor power consumption of front end is very big, though primary processor can be in dormant state when not executing the task, the work for the control liquid crystal display drive circuit during work still needs very big power consumption.How reducing the power consumption of the primary processor of front end, is one of improvement direction of liquid crystal indicator and liquid crystal display drive circuit.
In addition; Existing liquid crystal indicator generally adopts the small-capacity cells power supply; Because battery voltage after using after a while can reduce gradually, and the external voltage signal V in the above-mentioned liquid crystal display drive circuit is directly by external power source---battery provides, and then possibly cause the spread of voltage of electrode drive circuit output because cell voltage is unstable; And then cause the unsharp problem of liquid crystal display content, thereby product is scrapped in advance.
Summary of the invention
Technical matters to be solved by this invention is: remedy the deficiency of above-mentioned prior art, propose a kind of liquid crystal display drive circuit and liquid crystal indicator, make that the power consumption of the primary processor of front end decreases in the process of its work of control.
The further technical matters to be solved of the present invention is: the deficiency that remedies above-mentioned prior art; A kind of liquid crystal display drive circuit and liquid crystal indicator are proposed; Its operating voltage range is bigger, even liquid crystal display drive circuit also can operate as normal under the situation that feasible externally cell voltage reduces.
Technical matters of the present invention solves through following technical scheme:
A kind of liquid crystal display drive circuit; The control information of the primary processor of receiving front-end; The output electrode drive signal; The electrode displaying contents of driving liquid crystal screen comprises control register, time-sequence control module, display buffer register, bias voltage generation module and electrode drive module, also comprises and refreshes special register automatically; The control information of said each module of liquid crystal display drive circuit that the said primary processor of said control register heap reception writes, the work of said each module of control and the opening and closing of said liquid crystal display drive circuit; Said time-sequence control module receives the control information of said control register heap, controls said refresh the automatically timing working of special register and enabling and display mode of said electrode drive module; The video data of the said display element that refreshes by regularity that refreshes automatically that special register stores that said primary processor writes, and under the control of said time-sequence control module, said video data is loaded on said display buffer register automatically with timing round-robin mode; Said display buffer register receives the said video data that refreshes the display element that irregularities that said video data that special register loads and said primary processor write refreshes automatically, exports said electrode drive module to; Said bias voltage generation module receives voltage signal, produces bias voltage and exports said electrode drive module to; Said electrode drive module receives said bias voltage, said video data, under the control of said time-sequence control module, produces electrode drive signal.
In the optimized technical scheme,
Said liquid crystal display drive circuit also comprises low pressure difference linearity Voltage stabilizing module and charge pump boost module; The power end of said low pressure difference linearity Voltage stabilizing module connects external power source; Export first voltage to said charge pump boost module; Boost to second voltage through said charge pump boost module by multiple, said second voltage inputs to said bias voltage generation module as said voltage signal; The value of said second voltage is the driving voltage value of said LCDs.Like this; Being used for the part that bias voltage generates, set up low pressure difference linearity Voltage stabilizing module and charge pump boost module, after being boosted again, the output voltage elder generation voltage stabilizing of external power source supplies with the bias voltage generation module; Even make outer power voltage than under low or the unsettled situation; The bias voltage generation module still can produce stable bias voltage, and liquid crystal display drive circuit still can operate as normal, has enlarged the operating voltage range of liquid crystal display drive circuit effectively.For whole display device, be equivalent to improve to a certain extent their battery serviceable life.
In the further optimized technical scheme,
The control end of the linear Voltage stabilizing module of said low pressure receives the control signal of said control register heap, the size of regulating said first voltage according to said control signal.Through the value of the related register in the control register heap is set, can make the different level of first voltage output, thus the value of regulating second voltage, and then adjust bias voltage linearly, to satisfy the needs of different LCDs to drive level.
Wherein,
The said display element that refreshes by regularity is update cycle and all regular display element of update content; The display element that said irregularities refreshes is the display element of update cycle and/or update content irregularities.
Display element on the said LCDs comprises a second point of scintillation, progress bar and numerical character; The said display element that refreshes by regularity is said second point of scintillation and/or progress bar, and the display element that said irregularities refreshes is said numerical character.
The present invention also provides a kind of liquid crystal indicator, and liquid crystal display drive circuit wherein is above-mentioned liquid crystal display drive circuit.
The beneficial effect of the present invention and prior art contrast is:
Liquid crystal display drive circuit of the present invention is set up and is refreshed special register automatically, is exclusively used in the video data of the display element that storage refreshes by regular (update cycle and update content are all regular).Liquid crystal display drive circuit carry out these display elements that refresh by regularity refresh task the time; Automatically the video data that refreshes this display element that special register writes primary processor under the control of control register heap, time-sequence control module is loaded on the display buffer register with timing round-robin mode, sends into the generation that is used for electrode drive signal in the electrode drive module afterwards again.Like this; Can realize controlling the updating task of the display element that refreshes by regularity by refreshing special register automatically; Then no longer need the participation control of the primary processor of front end at the whole refresh process of the display element that refreshes by regularity; This just makes primary processor from dormant state, to wake up continually for the display element that upgrades those periodic refreshings, and the time that makes processor be in dormancy can prolong, thereby reduces the power consumption of the primary processor of front end greatly.
Description of drawings
Fig. 1 is the structural drawing of liquid crystal display drive circuit of the prior art;
Fig. 2 is the circuit diagram of the liquid crystal display drive circuit of the specific embodiment of the invention one;
Fig. 3 is the display element synoptic diagram of the LCDs of liquid crystal display drive circuit driving shown in Figure 2;
Fig. 4 is the circuit diagram of the liquid crystal display drive circuit of the specific embodiment of the invention two.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention is explained further details.
Embodiment one
As shown in Figure 2; Be the structural drawing of liquid crystal display drive circuit in this embodiment, comprise control register heap 8, time-sequence control module 9, refresh special register 10, display buffer register 11, bias voltage generation module 12 and electrode drive module 13 automatically.The input end of control register heap 8 connects first output terminal of the primary processor 7 of front end; The output terminal of control register heap 8 connects the input end of time-sequence control module 9; First output terminal of time-sequence control module 9 connects the first input end that refreshes special register 10 automatically; The first input end of the second output terminal connection electrode driver module 13 of time-sequence control module 9; Automatically second input end that refreshes special register 10 connects second output terminal of the primary processor 7 of front end; Automatically the output terminal that refreshes special register 10 connects the first input end of display buffer register 11, and second input end of display buffer register 11 connects the 3rd output terminal of the primary processor 7 of front end, second input end of the output terminal connection electrode driver module 13 of display buffer register 11; The input end of bias voltage generation module 12 connects external voltage signal V, the 3rd input end of output terminal connection electrode driver module 13.The control of this liquid crystal display drive circuit receiving front-end primary processor produces electrode drive signal, drives the electrode work of rear end LCDs, thus displaying contents.As shown in Figure 3, the display element synoptic diagram of the LCDs that drives for above-mentioned liquid crystal display drive circuit comprises second point of scintillation 101, progress bar 102 and 103 3 display elements of numerical character.Wherein, The update cycle of point of scintillation 101 and progress bar 102 second is regular; The electrode that update content all is point of scintillation, progress bar is corresponding is gone out by bright change, or brightens by going out, and is also regular; Promptly the update cycle and the update content of second point of scintillation 101 and progress bar 102 are all regular, its display element for refreshing by regularity.And the update cycle of numerical character 103 is regular, but its update content irregularities, the light on and off of the electrode that numerical character is corresponding need the numeral decision by each time, the display element that it refreshes for irregularities.
Among Fig. 2, control register heap 8 is control cores of whole liquid crystal display drive circuit, is storing all configuration informations of time-sequence control module 9, is used to control the output mode of the scanning sequence of liquid crystal display drive circuit, and the liquid crystal display drive circuit opening and closing.Control register heap 8 externally has access interface, and the primary processor 7 of front end can carry out read-write operation to control register heap 8 through this interface and obtain and change the various configuration informations relevant with liquid crystal display.
Time-sequence control module 9 is according to the settings of control register heap 8, and control refreshes the timing renewal of special register 10 and enabling and display mode of electrode output level driver module 13 automatically.
The video data of the display element that refreshes by regularity that refreshes automatically that primary processor 7 that special register 10 stores front end writes; Like " 1 " of representative " bright " and " 0 " of representative " going out ", and under the control of time-sequence control module 9, video data " 1 ", " 0 " are loaded on display buffer register 11 automatically with timing round-robin mode.Wherein, The update cycle of each display element is different; Concrete control procedure is also different; For example a second point of scintillation was the state of time interval Alternation Display " bright " and " going out " with 0.5 second, and progress bar renewal in per 10 seconds of being made up of 6 display segments once (as being display cycle of 1 minute, then need be upgraded 6 times).
Specifically; The control procedure of point of scintillation periodic refreshing is for second; The register correspondence that dibit position size is arranged in refreshing special register 10 automatically is in the control of some flicker second, and these two bits are stored " 0 " and " 1 " respectively, and this register is under the control of time-sequence control module 9; Be the time interval with 0.5 second automatically, alternately is used to control second bit of point of scintillation electrode in the display buffer register 11 and writes " 0 " and " 1 ".Like this, second point of scintillation segment electrode pin can be that time interval conversion output shows pattern with 0.5 second automatically, on the driving liquid crystal screen second point of scintillation " bright " and " going out ".
Control procedure for the progress bar periodic refreshing is; If progress bar upgrades M time with the time interval that equates in display cycle T; And each progress bar is controlled by N segment electrode; Set each electrode pair and answer the register of a bit of display buffer memory 11, N electrode pair answered the register of the N bit of display buffer memory 11, and M time video data is arranged; It is corresponding then to refresh the corresponding electrode of register that M * N bit is arranged in the special register and progress bar automatically; The register of this M * N bit automatically is the time interval with t=T/M under the control of time-sequence control module 9, and alternately writes the video data of M N bit the N bit register that is used for controlling the corresponding electrode of progress bar in the display buffer 11 successively.About the calculating of N, be the example explanation with the lattice liquid crystal display screen, establishing progress bar has y display segment; Liquid crystal display has x public electrode, and promptly 1 segment electrode can be controlled x display segment, when y/x is integer; Y/x segment electrode is a may command y display segment, promptly gets N=y/x; And when y/x is not integer, need (integral part of y/x+1) individual segment electrode could control y section in limited time, integral part+1 of promptly getting N=y/x.Illustrate, progress bar has 6 display segments, and LCDs has 4 public electrodes, and then 2 segment electrodes can be controlled 8 display segments (4 * 2), so progress bar needs 2 segment electrode controls, the register of 2 bits in the corresponding display buffer register.Setting progress bar upgraded 6 times in 1 minute display cycle; Then T=1 minute; T=10 second, M=6, the register that refreshes 6 * 2 bits in the special register 10 automatically is under the control of time-sequence control module 9; Be the time interval with t=10 second automatically, alternately writes the video data of 62 bits 2 bit register that are used for controlling the corresponding electrode of progress bar in the display buffer 11 successively.Under above-mentioned control, 2 the segment electrode pins corresponding with progress bar can be the time interval, 1 minute to be that time cycle conversion output shows pattern, the progress bar periodic refreshing on the driving liquid crystal screen with 10 seconds automatically.
Above-mentioned update mode (update cycle, update times, video data) all is provided with in the primary processor 7 of front end, writes in the control register heap 8, is controlled according to the update mode loading data that is provided with by 9 pairs of middle impact dampers 10 of time-sequence control module.
Bias voltage generation module 12 receives voltage signal V (WV of the LCDs that the value of voltage signal V drives is as required set); Produce bias voltage and export in the electrode drive module 13, the voltage amplitude of electrode demonstration is provided for electrode drive module 13.
Liquid crystal display drive circuit in this embodiment; Accomplish the task that refreshes of those demonstration key elements that refresh by regularity by refreshing special register automatically; Refreshing then of irregularities still accomplished by primary processor control; Thereby make the whole refresh process of the display element that refreshes by regularity not need the participation control of the primary processor of front end; This just makes primary processor from dormant state, to wake up continually for the display element that upgrades those periodic refreshings, and the time that makes processor be in dormancy can prolong, thereby realizes reducing greatly the purpose of power consumption of the primary processor of front end through the improvement to liquid crystal display drive circuit.
Also comprise a kind of liquid crystal indicator in this embodiment, the liquid crystal display drive circuit that wherein comprises is above-mentioned liquid crystal display drive circuit.The power consumption of this liquid crystal indicator primary processor decreases.
Embodiment two
This embodiment is with the difference of embodiment one: the liquid crystal display drive circuit in this embodiment also comprises low pressure difference linearity Voltage stabilizing module and charge pump boost module.
As shown in Figure 4; Structural drawing for the liquid crystal display drive circuit of this embodiment; Except that comprising control register heap 8, time-sequence control module 9, refreshing special register 10, display buffer register 11, bias voltage generation module 12 and the electrode drive module 13 automatically, also comprise low pressure difference linearity Voltage stabilizing module 14 and charge pump boost module 15.Control register heap 8, time-sequence control module 9, refresh modules such as special register 10, display buffer register 11, bias voltage generation module 12 and electrode drive module 13 automatically be connected, work all identical with embodiment one, be not repeated in this description at this.Following only emphasis is described being connected and work of low pressure difference linearity Voltage stabilizing module 14 and charge pump boost module 15.
The power end of low pressure difference linearity Voltage stabilizing module 14 connects external power source V0, and external power source V0 is stabilized on the first voltage V1 that a relative V0 decreases.The first voltage V1 exports the charge pump boost module to; Boost by multiple and to handle the back output second voltage V2; This second voltage V2 inputs in the bias voltage generation module 12 as voltage signal, produces the needed bias voltage of driving liquid crystal screen work by bias voltage generation module 12 according to the second voltage V2.
Liquid crystal display drive circuit in this embodiment is supplied with the bias voltage generation module with the output voltage of the external power source elder generation voltage stabilizing back of boosting again.Because the voltage stabilizing function of low pressure difference linearity Voltage stabilizing module 14 self; Even make outer power voltage V0 occur descending or fluctuation; The first voltage V1 of output remains stable, and then to make second voltage V2 of charge pump boost module 15 output and bias voltage that bias voltage generation module 12 produces also be stable.Liquid crystal display drive circuit still can operate as normal, has enlarged the operating voltage range of liquid crystal display drive circuit effectively.
Preferably; The control end of the linear Voltage stabilizing module 14 of low pressure is received the control signal of control register heap 8; Size by 8 couples first voltage V1 of control register heap is controlled and is regulated; Through the value of the related register in the control register heap 8 is set, can makes the different level of first voltage V1 output, and then adjust second voltage of charge pump boost module 15 outputs and the bias voltage of bias voltage generation module 12 outputs linearly; Make the bias voltage scalable of generation, to satisfy the needs of different LCDs to drive level.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, make some substituting or obvious modification under the prerequisite of the present invention design not breaking away from, and performance or purposes are identical, all should be regarded as belonging to protection scope of the present invention.
Claims (9)
1. liquid crystal display drive circuit; The control information of the primary processor of receiving front-end; The output electrode drive signal; The electrode displaying contents of driving liquid crystal screen comprises control register heap, time-sequence control module, display buffer register, bias voltage generation module and electrode drive module, it is characterized in that: also comprise and refresh special register automatically;
The control information of said each module of liquid crystal display drive circuit that the said primary processor of said control register heap reception writes, the work of said each module of control and the opening and closing of said liquid crystal display drive circuit;
Said time-sequence control module receives the control information of said control register heap, controls said refresh the automatically timing working of special register and enabling and display mode of said electrode drive module;
The video data of the said display element that refreshes by regularity that refreshes automatically that special register stores that said primary processor writes, and under the control of said time-sequence control module, said video data is loaded on said display buffer register automatically with timing round-robin mode;
Said display buffer register receives the said video data that refreshes the display element that irregularities that said video data that special register loads and said primary processor write refreshes automatically, exports said electrode drive module to;
Said bias voltage generation module receives voltage signal, produces bias voltage and exports said electrode drive module to;
Said electrode drive module receives said bias voltage, said video data, under the control of said time-sequence control module, produces electrode drive signal;
Wherein, the said display element that refreshes by regularity is update cycle and all regular display element of update content; The display element that said irregularities refreshes is the display element of update cycle and/or update content irregularities.
2. liquid crystal display drive circuit according to claim 1; It is characterized in that: said liquid crystal display drive circuit also comprises low pressure difference linearity Voltage stabilizing module and charge pump boost module; The power end of said low pressure difference linearity Voltage stabilizing module connects external power source; Export first voltage to said charge pump boost module, boost to second voltage through said charge pump boost module by multiple, said second voltage inputs to said bias voltage generation module as said voltage signal; The value of said second voltage is the driving voltage value of said LCDs.
3. liquid crystal display drive circuit according to claim 2 is characterized in that: the control end of said low pressure difference linearity Voltage stabilizing module receives the control signal of said control register heap, the size of regulating said first voltage according to said control signal.
4. liquid crystal display drive circuit according to claim 1 is characterized in that: the display element on the said LCDs comprises a second point of scintillation, progress bar and numerical character; The said display element that refreshes by regularity is said second point of scintillation and/or progress bar, and the display element that said irregularities refreshes is said numerical character.
5. liquid crystal display drive circuit according to claim 4; It is characterized in that: the said display element that refreshes by regularity is point of scintillation second on the said LCDs; The said special register that refreshes automatically has the bright video data " 1 " of the representative of said second point of scintillation of space storage of dibit and represents the video data " 0 " that goes out; The said special register that refreshes automatically is the time interval automatically with 0.5s under the control of said time-sequence control module, and circulation is loaded on said video data " 1 " and " 0 " bit of the electrode that is used to control said second point of scintillation correspondence in the said display buffer register.
6. liquid crystal display drive circuit according to claim 4; It is characterized in that: the said display element that refreshes by regularity is the progress bar on the said LCDs; If progress bar upgrades M time with the time interval that equates in display cycle T; Said progress bar is controlled by N segment electrode; Each electrode pair is answered the register of said display buffer register one bit; The said special register that refreshes automatically has the space of M * N bit to store the video data of said progress bar, and the said special register that refreshes automatically is the time interval automatically with T/M under the control of said time-sequence control module, circularly the video data of M N bit is loaded on the register of the N bit that is used for controlling said progress bar in the said display buffer register.
7. liquid crystal display drive circuit according to claim 6 is characterized in that: said LCDs is the lattice liquid crystal display screen, and x public electrode arranged; Said progress bar has y display segment; Said progress bar is controlled by N segment electrode, when y/x is integer, and N=y/x; When y/x is not integer, the integral part of N=y/x+1.
8. liquid crystal display drive circuit according to claim 1; It is characterized in that: said electrode drive signal is the periodic scan pulse; The bias voltage decision that the output amplitude of said periodic scan pulse is produced by said bias voltage generation module; The frequency of said periodic scan pulse is by the display mode decision of said time-sequence control module output, and the pattern of said periodic scan pulse is by the video data decision of said display buffer register output.
9. liquid crystal indicator, it is characterized in that: the liquid crystal display drive circuit in the said liquid crystal indicator is a liquid crystal display drive circuit according to claim 1.
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| CN 201110073926 CN102122497B (en) | 2011-03-25 | 2011-03-25 | Liquid crystal display (LCD) drive circuit and LCD device |
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| CN 201110073926 CN102122497B (en) | 2011-03-25 | 2011-03-25 | Liquid crystal display (LCD) drive circuit and LCD device |
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| CN103325347A (en) * | 2012-03-23 | 2013-09-25 | 菉亚电子(深圳)有限公司 | Controlling and driving circuit of liquid crystal displayer and electronic device |
| CN103123778B (en) * | 2012-12-18 | 2015-06-17 | 杭州士兰微电子股份有限公司 | Segment type liquid crystal display driving circuit with point twinkling function |
| US9330618B2 (en) | 2013-04-12 | 2016-05-03 | Lg Display Co., Ltd. | Driving circuit for display device and method of driving the same |
| CN106775545B (en) * | 2017-02-10 | 2020-06-02 | 泰凌微电子（上海）有限公司 | Method and device for updating node |
| KR102529503B1 (en) * | 2018-11-21 | 2023-05-08 | 엘지디스플레이 주식회사 | Display Apparatus and Driving Method of the same |
| TWI685830B (en) * | 2018-12-18 | 2020-02-21 | 大陸商北京集創北方科技股份有限公司 | DC power supply circuit with high power rejection ratio and display device including the same |
| CN111768738B (en) * | 2020-06-11 | 2021-11-23 | 昇显微电子(苏州)有限公司 | Circuit design method for reducing refresh rate and saving power consumption of AMOLED display driving chip |
| CN213982256U (en) * | 2020-09-25 | 2021-08-17 | 厦门优胜卫厨科技有限公司 | Display device and shower control device |
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| US5896114A (en) * | 1993-11-11 | 1999-04-20 | Seiko Epson Corporation | Matrix type display device, electronic system including the same and method of driving such a display device |
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