CN101582242B - Data drive circuit used for liquid crystal display with low color bias - Google Patents
Data drive circuit used for liquid crystal display with low color bias Download PDFInfo
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- CN101582242B CN101582242B CN200810097052XA CN200810097052A CN101582242B CN 101582242 B CN101582242 B CN 101582242B CN 200810097052X A CN200810097052X A CN 200810097052XA CN 200810097052 A CN200810097052 A CN 200810097052A CN 101582242 B CN101582242 B CN 101582242B
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Abstract
The invention relates to a data drive circuit used for a liquid crystal display with low color bias, comprising a sequence-to-juxtaposition conversion die set, a compensation data generation die set, a digital-to-analog conversion die set and an operational amplification die set, wherein the sequence-to-juxtaposition conversion die set is used for converting a plurality of pixel data received sequentially into juxtaposition for output; the compensation data generation die set is used for carrying out operation according to the pixel data so as to generate a plurality of gamma compensation data; the digital-to-analog conversion die set is used for carrying out digital-to-analog conversion on the pixel data and the gamma compensation data according to a gamma voltmeter; and the operational amplification die set is used for generating a plurality of main pixel drive voltage and a plurality of compensation pixel drive voltage according to an analog signal output by the digital-to-analog conversion die set so as to drive a plurality of main pixels and a plurality of corresponding compensation pixels corresponding to the same sequence in the liquid crystal display with low color bias.
Description
Technical field
The present invention refers to a kind of data drive circuit that is used for liquid crystal display with low color bias, refers to a kind of system clock and the character used in proper names and in rendering some foreign names agate voltage table of minimum number data drive circuit of realizing the compensation of character used in proper names and in rendering some foreign names agate by minimum especially.
Background technology
LCD is owing to have that external form is frivolous, power consumption is few and characteristic such as radiationless pollution, therefore be widely used on the information products such as mobile computer, personal computer displays and personal digital assistant, and replace the conventional cathode ray tube TV gradually, become the main flow of domestic TV commodity.
Compared to the conventional cathode ray tube display, LCD produces the situations of brightness and contrast difference because of user's viewing angle difference easily, even the phenomenon of gray-scale inversion is arranged with great visual angle the time.Therefore, at present industry generally can adopt the multidimensional vertical orientation (Multi-domain Vertical Alignment, MVA) wide viewing angle liquid crystal technology such as technology and plane torsion technology improve the broad inadequately problem of visual angle of liquid crystal display.Yet, for the LCD that adopts multidimensional vertical orientation technology, when direction is watched the picture of liquid crystal visual organ with great visual angle, still have the problem of colour cast whiting (color wash-out) or gamma curve skew, for instance, as user during more away from the front position of multidimensional homeotropic liquid crystal display, the contrast meeting of the image of being seen is more and more poorer, causes the luminance difference disappearance between the high briliancy image and can't see clearly image.
Color offset phenomenon is main because the incident light of different angles has different penetrances in liquid crystal layer, so the GTG coefficient curve (or claiming character used in proper names and in rendering some foreign names Maqu line) that LCD is produced in different visual angles (for example facing or side-looking) also can be different.Thus, under different visual angles, various coloured light (for example red light, green light and blue light) will carry out colour mixture with different GTG ratios, and cause Show Color colo(u)r bias phenomenon inequality.
In order to improve the colour cast problem of multidimensional homeotropic liquid crystal display, known technology generally can blend together two groups of above character used in proper names and in rendering some foreign names Maqu lines, so that the character used in proper names and in rendering some foreign names Maqu line that blendes together has identical GTG coefficient under different visual angles by the mode of character used in proper names and in rendering some foreign names agate compensation.Above-mentioned character used in proper names and in rendering some foreign names agate compensation mainly contains following two kinds of implementations: one is space compensation, and another then is a time bias.Space compensation designs plural sub-pixel in a pixel of liquid crystal panel, and by another group GTG value that shows corresponding to an original GTG value, sees through the GTG average effect and obtain as the same brightness impression of original GTG value and the visual effect of wide viewing angle.In comparison, time bias then is the characteristic that persists by human eye vision, shows one group of GTG value corresponding to an original GTG value in addition in an image time, to reach the visual effect of wide viewing angle.Yet for the data drive circuit of LCD, no matter adopt space compensation or time bias, each pixel all need increase extra compensation pixel data and drive, and in this case, the production cost of data driving chip will improve significantly.
At first, please refer to Fig. 1, Fig. 1 is the known synoptic diagram that is used for a data drive circuit 10 of a conventional liquid crystal.Data drive circuit 10 is one to have the data drive circuit of effectively output of N (promptly be used for a driving N pixel), and it roughly includes the temporary module 110 of data, a numeral to analog-converted module 120 and computing amplification module 130.The temporary module 110 of data is made up of data working storage RG_1～RG_N, be used for receiving pixel data DATA_1～DATA_N in regular turn, and export pixel data DATA_1～DATA_N to numeral side by side to analog-converted module 120 according to a data upload signal LD according to a clock signal clk.Numeral is made up of digital to analog converter DAC_1～DAC_N to analog-converted module 120, in order to according to a character used in proper names and in rendering some foreign names agate voltage table Gamma_LUT (that is Gamma generator), converts pixel data DATA_1～DATA_N to simulating signal ANAG_1～ANAG_N.At last, the simulating signal that module 130 is exported to analog-converted module 120 according to numeral is amplified in the computing of being made up of operational amplifier OP_1～OP_N, produces corresponding driving voltage, to drive in the LCD N pixel corresponding to same row.
Yet for the liquid crystal display with low color bias that adopts the compensation of character used in proper names and in rendering some foreign names agate, being used for the data drive circuit of a driving N pixel equally needs to use the system clock more than the twice or realizes by the hardware circuit more than the twice.For instance, please refer to Fig. 2, Fig. 2 is the synoptic diagram of a data drive circuit 20 of a known liquid crystal display with low color bias that is used to adopt space compensation.Similarly, data drive circuit 20 also includes the temporary module 210 of data, a numeral is amplified module 230 to an analog-converted module 220 and a computing, and its associative operation repeats no more.Owing to adopt each pixel of the liquid crystal display with low color bias of space compensation to need two driving voltages to drive simultaneously, therefore if under the situation that does not increase character used in proper names and in rendering some foreign names agate voltage table quantity, data are kept in the quantity that module 210, numeral amplify element in the module 230 to analog-converted module 220 and computing and all must be doubled, and receive N pixel data and corresponding N character used in proper names and in rendering some foreign names sign indicating number offset data by the system clock of twice, to produce 2N sub-pixel drive voltage, as shown in Figure 2.In this case, the Electromagnetic Interference of the production cost of wafer and clock signal generation also improves simultaneously accordingly.
Data drive circuit on the other hand,, then needs to increase the quantity of character used in proper names and in rendering some foreign names agate voltage table, so that can produce main pixel drive voltage and compensation pixel driving voltage simultaneously according to the pixel data that is received if it is constant to keep system clock.Please refer to Fig. 3, Fig. 3 is the synoptic diagram of a data drive circuit 30 of a known liquid crystal display with low color bias that is used to adopt space compensation.Because system clock remains unchanged, the expression 30 same times of data drive circuit can also remain unchanged from the quantity of outside receiving digital data, therefore data drive circuit 30 need produce extra character used in proper names and in rendering some foreign names agate offset data internally, to drive in the LCD 2N sub-pixel corresponding to same row.As shown in Figure 3, data drive circuit 30 is by increasing by one group of extra character used in proper names and in rendering some foreign names agate voltage table Gamma_LUT ", with according to the N that an is received pixel data, produce 2N sub-pixel drive voltage simultaneously.Yet character used in proper names and in rendering some foreign names agate voltage table that is increased and required distribution coiling thereof can significantly increase the height of wafer layout, cause the increase of wafer manufacturing cost.
In brief, known technology needs perhaps to increase the quantity of character used in proper names and in rendering some foreign names agate voltage table by improving system clock, realizes the data driving chip of tool character used in proper names and in rendering some foreign names agate compensate function, to improve the colour cast problem of LCD.Yet, improving system clock and can cause serious electromagnetic interference problem, the quantity that increases character used in proper names and in rendering some foreign names agate voltage table can increase the size of wafer significantly, and both all cause the raising of wafer manufacture cost.
Summary of the invention
Purpose of the present invention promptly is to provide a kind of data drive circuit that is used for liquid crystal display with low color bias.
The present invention discloses a kind of data drive circuit that is used for a liquid crystal display with low color bias, includes a sequence to changing module side by side, is used for receiving in regular turn a plurality of pixel datas, and according to a data upload signal, exports these a plurality of pixel datas side by side; One offset data produces module and is coupled to this sequence to changing module side by side, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas according to these a plurality of pixel datas; One numeral to analog-converted module is coupled to this sequence and produces module to changing module and this offset data side by side, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, and these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas are carried out numeral to analog-converted; And one computing amplify module and be coupled to this numeral to the analog-converted module, be used for the simulating signal exported according to this digital to analog converter module, generation is corresponding to a plurality of main pixel drive voltage of these a plurality of pixel datas and corresponding to a plurality of compensation pixel driving voltages of these a plurality of character used in proper names and in rendering some foreign names agate offset datas, to drive in this liquid crystal display with low color bias a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
The present invention discloses a kind of data drive circuit that is used for a liquid crystal display with low color bias in addition, includes a sequence to changing module side by side, is used for receiving in regular turn a plurality of pixel datas, and according to a data upload signal, exports these a plurality of pixel datas side by side; One numeral to analog-converted module is coupled to this sequence to changing module side by side, is used for these a plurality of pixel datas being carried out numeral to analog-converted, to produce a plurality of simulating signals according to a character used in proper names and in rendering some foreign names sign indicating number voltage table; And one driving voltage produce module and be coupled to this numeral to the analog-converted module, include a plurality of first operational amplifiers and a plurality of second amplifier.These a plurality of first amplifiers are coupled to this numeral to the analog-converted module, are used for respectively producing a plurality of main pixel drive voltage according to these a plurality of simulating signals.These a plurality of second operational amplifiers are coupled to this numeral to the analog-converted module, are used for respectively producing a plurality of corresponding compensation pixel driving voltages according to these a plurality of simulating signals.Wherein, these a plurality of main pixel drive voltage and this a plurality of corresponding compensation pixel driving voltages are used for driving in this liquid crystal display with low color bias a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
The present invention discloses a kind of data drive circuit that is used for a liquid crystal display with low color bias in addition, includes a shift register module, and a plurality of pixel datas that are used for receiving in regular turn convert output arranged side by side to; One offset data produces module and is coupled to this shift register module, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas according to these a plurality of pixel datas; One data bolt-lock module is coupled to this shift register module and this offset data produces module, be used for storing these a plurality of pixel datas and these a plurality of corresponding character used in proper names and in rendering some foreign names agate offset datas, and, export these a plurality of pixel datas and these a plurality of corresponding character used in proper names and in rendering some foreign names agate offset datas according to a data upload signal; One numeral to analog-converted module is coupled to this data bolt-lock module, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, respectively these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas is carried out numeral to analog-converted; And one computing amplify module and be coupled to this numeral to the analog-converted module, be used for the simulating signal exported to the analog-converted module according to this numeral, generation is corresponding to a plurality of main pixel drive voltage of these a plurality of pixel datas and corresponding to a plurality of compensation pixel driving voltages of these a plurality of character used in proper names and in rendering some foreign names agate offset datas, to drive in this liquid crystal display with low color bias a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
The present invention discloses a kind of data drive circuit that is used for a liquid crystal display with low color bias in addition, includes a data input pin, is used for receiving in regular turn a plurality of pixel datas; One offset data generation unit is coupled to this data input pin, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas in regular turn according to these a plurality of pixel datas that receive in regular turn; One first sequence is coupled to this data input pin to changing module side by side, is used for storing these a plurality of pixel datas, and according to a data upload signal, these a plurality of pixel datas of output arranged side by side; One second sequence is coupled to this offset data generation unit to changing module side by side, is used for storing these a plurality of character used in proper names and in rendering some foreign names agate offset datas, and according to this data upload signal, these a plurality of character used in proper names and in rendering some foreign names agate offset datas of output arranged side by side; One numeral to analog-converted module is coupled to this first sequence to changing module and this second sequence side by side to conversion module arranged side by side, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, respectively these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas is carried out numeral to analog-converted; And one computing amplify module and be coupled to this numeral to the analog-converted module, be used for the simulating signal exported to the analog-converted module according to this numeral, generation is corresponding to a plurality of main pixel drive voltage of these a plurality of pixel datas and corresponding to a plurality of compensation pixel driving voltages of these a plurality of character used in proper names and in rendering some foreign names agate offset datas, to drive in this liquid crystal display with low color bias a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
The present invention discloses a kind of data drive circuit that is used for liquid crystal display with low color bias in addition, includes a shift register module, and a plurality of pixel datas that are used for receiving in regular turn convert output arranged side by side to; One offset data produces module and is coupled to this shift register module, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas according to these a plurality of pixel datas; All die change groups are coupled to this shift register module and this offset data produces module, are used for switching these a plurality of pixel datas of output and these a plurality of character used in proper names and in rendering some foreign names agate offset datas; One numeral to analog-converted module is coupled to this switching module, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, and these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas of this switching output that module switches are carried out numeral to analog-converted; And one computing amplify module and be coupled to this numeral to the analog-converted module, be used for the simulating signal exported to the analog-converted module according to this numeral, produce a plurality of driving voltages, to drive in the LCD a plurality of pixels corresponding to same row.
Description of drawings
Fig. 1 is the known synoptic diagram that is used for a data drive circuit of a conventional liquid crystal.
Fig. 2 is the synoptic diagram of a data drive circuit of a known liquid crystal display with low color bias that is used to adopt space compensation.
Fig. 3 is the synoptic diagram of a data drive circuit of a known liquid crystal display with low color bias that is used to adopt space compensation.
Fig. 4 is used for the synoptic diagram of a data drive circuit of a liquid crystal display with low color bias for first embodiment of the invention.
Fig. 5 is used for the synoptic diagram of a data drive circuit of a liquid crystal display with low color bias for second embodiment of the invention.
Fig. 6 is used for the synoptic diagram of a data drive circuit of a liquid crystal display with low color bias for third embodiment of the invention.
Fig. 7 is used for the synoptic diagram of a data drive circuit of a liquid crystal display with low color bias for fourth embodiment of the invention.
Fig. 8 is used for the synoptic diagram of a data drive circuit of a liquid crystal display with low color bias for fifth embodiment of the invention.
Fig. 9 is used for the synoptic diagram of a data drive circuit of a liquid crystal display with low color bias for sixth embodiment of the invention.
[main element symbol description]
10,20,30,40,50,60,70,80,90 data drive circuits
110, the temporary module of 210,310 data
120,220,320,430,520,640,750,850,950 numerals are to the analog-converted module
130, module is amplified in 230,330,440,530,650,760,860,960 computings
RG_1～RG_N, RG_1a～RG_Na, RG_1b～RG_Nb data working storage
The CLK clock signal
DATA_1～DATA_N pixel data
LD data upload signal
DAC_1～DAC_n digital to analog converter
Gamma_LUT, Gamma_LUT " character used in proper names and in rendering some foreign names agate voltage table
ANAG_1～ANAG_N, ANAG_1a～ANAG_Na, ANAG_1b～ANAG_Nb simulating signal
OP_1～OP_n, OP_1a～OP_Na, OP_1b～OP_Nb operational amplifier
410,510,730,740 sequences are to changing module side by side
420,620,820,920 offset datas produce module
SUB_1～SUB_N character used in proper names and in rendering some foreign names agate offset data
FNC_1～FNC_N, 720 computing circuits
The CTRL control signal
610,810,910 shift register modules
630,840,930 data bolt-lock modules
SR_1～SR_N shift registor
DL_1～DL_N data bolt lock device
710 data input pins
830,940 switch module
MUX_1～MUX_N multiplexer
Embodiment
Please refer to Fig. 4, Fig. 4 is used for the synoptic diagram of a data drive circuit 40 of a liquid crystal display with low color bias for first embodiment of the invention.Data drive circuit 40 is one to have the data drive circuit of effectively output of N (promptly be used for a driving N pixel), and it includes a sequence to conversion module 410, an offset data produce module 420, a numeral to analog-converted module 430 and computing amplification module 440 side by side.Sequence is used for receiving pixel data DATA_1～DATA_N in regular turn according to a clock signal clk to changing module 410 side by side, and according to data upload signal LD output pixel data DATA_1 arranged side by side～DATA_N.Offset data produces module 420 and is coupled to sequence to changing module 410 side by side, is used for carrying out computing according to pixel data DATA_1～DATA_N, to produce corresponding character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N.Numeral to analog-converted module 430 is coupled to sequence to conversion module 410 and offset data produce module 420 side by side, be used for respectively pixel data DATA_1～DATA_N and character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N being carried out numeral to analog-converted according to a character used in proper names and in rendering some foreign names sign indicating number voltage table Gamma_LUT (being the Gamma voltage generator).Computing is amplified module 440 and is coupled to numeral to analog-converted module 430, be used for the simulating signal ANAG_1a～ANAG_Na and the ANAG_1b～ANAG_Nb that are exported according to the digital to analog converter module, generation is corresponding to the driving voltage of pixel data DATA_1～DATA_N and character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N, to drive in this liquid crystal display with low color bias corresponding to the individual main pixel of the N of same row and N corresponding compensation pixel.
Wherein, sequence to arranged side by side conversion module 410, numeral to analog-converted module 430 and computing amplify the temporary module 110 of data, numeral to the analog-converted module 120 and computing that the associative operation of module 440 is similar among Fig. 1 and amplify module 130, repeat no more in this.Offset data produces module 420 to be made up of computing circuit FNC_1～FNC_N, and it is used for respectively pixel data DATA_1～DATA_N is carried out a functional operation F (x), to produce corresponding character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N.That is to say, the generation of character used in proper names and in rendering some foreign names agate offset data is carried out function by computing circuit FNC_1～FNC_N to main picture element data and is converted among the present invention, and the transfer function F (x) between main pixel data and character used in proper names and in rendering some foreign names agate offset data can be a transfer function arbitrarily, as long as can all belong to scope of the present invention by the color offset phenomenon that character used in proper names and in rendering some foreign names agate compensation way improves LCD.In addition, the performed functional operation of computing circuit FNC_1～FNC_N can also be a multivariate function computing, for example F (x, y), wherein parameter y can set by the control signal CTRL of an outside input, the elasticity when using data drive circuit of the present invention to improve.
Preferably, data drive circuit 40 is applied to adopt a liquid crystal display with low color bias of space compensation, and when each pixel in this LCD is made up of plural sub-pixel, data drive circuit 40 also can see through plural computing circuit each pixel data is carried out functional operation, to produce the character used in proper names and in rendering some foreign names agate offset data of corresponding quantity, corresponding variation like this also belongs to scope of the present invention.On the other hand, computing circuit of the present invention can be realized by various analog or digital logical operation circuit modes, and each data temporary storage location RG_N of sequence conversion module 410 extremely arranged side by side is made up of a shift registor and a data bolt lock device, it is known to those skilled in the art, does not give unnecessary details in this.
Therefore, data drive circuit 40 of the present invention produces module 420 by offset data, carries out functional operation according to the pixel data that is received, to produce main pixel drive voltage and compensation pixel driving voltage simultaneously.Thus, data drive circuit 40 of the present invention can be realized the compensation of character used in proper names and in rendering some foreign names agate by the character used in proper names and in rendering some foreign names agate voltage table of the clock frequency of minimum and minimum number, improving the colour cast problem of LCD, and reduces the production cost that drives wafer significantly.
In addition, because operational amplifier can be considered a computing circuit, so the operating function F (x) that the present invention can further will above-mentionedly be used for producing character used in proper names and in rendering some foreign names agate offset data is implemented in the operational amplifier module of data drive circuit, to reduce the production cost of driving wafer.Please continue with reference to figure 5, Fig. 5 is used for the synoptic diagram of a data drive circuit 50 of a liquid crystal display with low color bias for second embodiment of the invention.Data drive circuit 50 is one to have the effectively data drive circuit of output of N, and it includes a sequence to conversion module 510, a numeral to an analog-converted module 520 and a computing amplify module 530 side by side.Sequence to side by side conversion module 510 and numeral to analog-converted module 520 is similar to sequence among Fig. 4 to conversion module 410 and numeral repeat no more in this to analog-converted module 430 side by side.Computing is amplified module 530 and is coupled to numeral to analog-converted module 520, includes first operational amplifier OP_1a～OP_Na and second operational amplifier OP_1b～OP_Nb.First operational amplifier OP_1a～OP_Na is coupled to digital to analog converter module 520, be used for carrying out the voltage buffered, to export corresponding main pixel drive voltage according to simulating signal ANAG_1～ANAG_N that numeral is exported to the analog-converted module.Second operational amplifier OP_1b～OP_Nb is coupled to numeral to analog-converted module 520, then is used for carrying out a functional operation F (x) according to simulating signal ANAG_1～ANAG_N, to produce corresponding compensation pixel driving voltage.
That is to say, data drive circuit 50 of the present invention is except carrying out the voltage buffered simulating signal ANAG_1～ANAG_N by first operational amplifier OP_1a～OP_Na, simultaneously simulating signal ANAG_1～ANAG_N is carried out functional operation, to produce main pixel drive voltage and corresponding compensation pixel driving voltage simultaneously by second operational amplifier OP_1b～OP_Nb.Thus, data drive circuit 50 of the present invention can be realized the compensation of character used in proper names and in rendering some foreign names agate by the clock frequency of minimum and the character used in proper names and in rendering some foreign names agate voltage table of minimum number, improves the colour cast problem of LCD, and reduces the production cost that drives wafer significantly.
Similarly, data drive circuit 50 is applied to adopt a liquid crystal display with low color bias of space compensation, and second operational amplifier also can be set according to the control signal CTRL of outside input, to carry out the computing of multivariate function, repeats no more in this.
Certainly, the above-mentioned operating function F (x) that is used for the producing character used in proper names and in rendering some foreign names agate offset data sequence that also can be implemented in data drive circuit is to conversion module side by side.For instance, please continue with reference to figure 6, Fig. 6 is used for the synoptic diagram of a data drive circuit 60 of a liquid crystal display with low color bias for third embodiment of the invention.Data drive circuit 60 is one to have the effectively data drive circuit of output of N, and it includes a shift register module 610, an offset data and produces module 620, a data bolt-lock module 630, a numeral to an analog-converted module 640 and a computing and amplify module 650.Shift register module 610 is made up of shift registor SR_1～SR_N, is used for according to a clock signal clk, converts the pixel data DATA_1～DATA_N that receives in regular turn to output arranged side by side.Offset data produces module 620 and is coupled to shift registor module 610, it is made up of computing circuit FNC_1～FNC_N, be used for respectively pixel data DATA_1～DATA_N is carried out a functional operation F (x), to produce corresponding character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N.Data bolt-lock module 630 is coupled to shift register module 620 and offset data produces module 610, it is made up of data bolt lock device DL_1～DL_N, be used for according to a data upload signal LD pixel data DATA_1～DATA_N and character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N that output is received.Numeral to the analog-converted module 430 and computing that digital associative operation to analog-converted module 640 and computing amplification module 650 then is similar among Fig. 4 amplifies module 440, repeats no more in this.
That is to say, the operating function F (x) that data drive circuit 60 of the present invention will be used for producing character used in proper names and in rendering some foreign names agate offset data is implemented between shift register module 610 and the data bolt-lock module 630, therefore when shift register module 610 output pixel data DATA_1 arranged side by side～DATA_N, data drive circuit 60 of the present invention can carry out functional operation to pixel data DATA_1～DATA_N by computing circuit FNC_1～FNC_N, to produce corresponding character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N.Thus, data drive circuit 60 of the present invention can produce main pixel drive voltage and character used in proper names and in rendering some foreign names agate complementary drive voltages, to improve the colour cast problem of LCD simultaneously under the situation of keeping identical systems clock and identical character used in proper names and in rendering some foreign names agate voltage table quantity.
Please continue with reference to figure 7, Fig. 7 is used for the synoptic diagram of a data drive circuit 70 of a liquid crystal display with low color bias for fourth embodiment of the invention.Data drive circuit 70 is one to have the effectively data drive circuit of output of N, its include a data input pin 710, a computing circuit 720, one first sequence to conversion module 730, one second sequence side by side to conversion module 740, a numeral to an analog-converted module 750 and a computing amplify module 760 side by side.Data input pin 710 is used for receiving in regular turn pixel data DATA_1～DATA_N.Computing circuit 720 is coupled to data input pin 710, is used for the pixel data DATA_1～DATA_N that receives is in regular turn carried out a functional operation F (x), to produce corresponding character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N in regular turn.First sequence is coupled to data input pin 710 to changing module 730 side by side, it is made up of data working storage RG_1a～RG_Na, be used for according to the temporary in regular turn pixel data DATA_1～DATA_N of a clock signal clk, and according to data upload signal LD output pixel data DATA_1 arranged side by side～DATA_N.Second sequence is coupled to computing circuit 720 to changing module 740 side by side, it is made up of data working storage RG_1b～RG_Nb, be used for according to the temporary in regular turn character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N of clock signal clk, and export character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N side by side according to data upload signal LD.Numeral to the analog-converted module 430 and computing that digital to analog converter module 750 and 760 of modules of computing amplification are similar among Fig. 4 amplifies module 440, repeats no more in this.
That is to say, the operating function F (x) that data drive circuit 70 of the present invention will be used for producing character used in proper names and in rendering some foreign names agate offset data is implemented in before the data working storage in the data drive circuit, thus, the present invention can be by first and second sequence to arranged side by side conversion module 730,740 character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N of being produced to pixel data DATA_1～DATA_N and computing circuit 720 of bolt-lock simultaneously.In this case, data drive circuit of the present invention can be under the situation of keeping identical systems clock and identical character used in proper names and in rendering some foreign names agate voltage table quantity, produce main pixel drive voltage and character used in proper names and in rendering some foreign names agate complementary drive voltages simultaneously, improving the colour cast problem of LCD, and then reduce the production cost that drives wafer significantly.In addition, because the embodiment of the invention only needs to be provided with a computing circuit in data drive circuit, therefore can significantly reduce the circuit area of the required use of computing circuit.
On the other hand, by operating function F (x) suitably is set, data drive circuit of the present invention also can produce main pixel drive voltage and compensation pixel driving voltage in regular turn on sequential, by the system clock of minimum and the character used in proper names and in rendering some foreign names agate voltage table of minimum number the liquid crystal display with low color bias that adopts time bias is driven.For instance, please refer to Fig. 8, Fig. 8 is used for the synoptic diagram of a data drive circuit 80 of a liquid crystal display with low color bias for fifth embodiment of the invention.Data drive circuit 80 is one to have the effectively data drive circuit of output of N, and it includes a shift register module 810, an offset data and produces module 820, all die change groups 830, a data bolt-lock module 840, a numeral to an analog-converted module 850 and a computing and amplify module 860.Shift register module 810 is used for according to a clock signal clk, converts the pixel data DATA_1～DATA_N that receives in regular turn to output arranged side by side.Offset data produces module 820 and is coupled to shift registor module 810, it is made up of computing circuit FNC_1～FNC_N, be used for pixel data DATA_1～DATA_N is carried out a functional operation F (x), to produce corresponding character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N.Switch module 830 and be coupled to shift register module 810 and offset data generation module 820, it is made up of multiplexer MUX_1～MUX_n, is used for switching output pixel data DATA_1～DATA_N and character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N.Data bolt-lock module 840 is coupled to and switches module 830, be used for keeping in switching module 830 and switch the pixel data DATA_1～DATA_N or the character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N of output, and according to a data upload signal LD, pixel data DATA_1～DATA_N or character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N that output is kept in.Numeral to analog-converted module 850 is coupled to data bolt-lock module 840, be used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table Gamma_LUT, pixel data DATA_1～DATA_N or character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N that data bolt-lock module 840 is exported carry out the conversion of numeral to simulation.Computing is amplified module 850 and is coupled to numeral to analog-converted module 840, then be used for simulating signal ANAG_1～ANAG_N of being exported according to the digital to analog converter module, generation is corresponding to the driving voltage of pixel data DATA_1～DATA_N and character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N, to drive in this liquid crystal display with low color bias N pixel corresponding to same row.
Therefore, character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N that data drive circuit of the present invention switches output pixel data DATA_1～DATA_N and produced via functional operation F (x) by multiplexer MUX can produce driving voltage corresponding to pixel data DATA_1～DATA_N and character used in proper names and in rendering some foreign names agate offset data SUB_1～SUB_N in regular turn so that module 860 is amplified in numeral to analog-converted module 850 and computing.Thus, data drive circuit of the present invention can be by the system clock of minimum and the character used in proper names and in rendering some foreign names agate voltage table of minimum number, on sequential, produce main pixel drive voltage and compensation pixel driving voltage in regular turn, improve the colour cast problem of LCD with the purpose that reaches time bias.Need to use the system clock of twice could realize time bias in prior art, data driving chip of the present invention can reduce production costs significantly, and the electromagnetic interference problem that clock signal produced also can be enhanced effectively.
Please note, above-mentionedly be used to realize that the data drive circuit of time bias is not limited to the embodiment of Fig. 8, those skilled in the art also can do suitable variation according to the actual requirements, for example also can be arranged between the first order and second level data working storage of data drive circuit (be between shift registor and the data bolt lock device to computing circuit FNC_1～FNC_N, as shown in Figure 9), it also belongs to scope of the present invention.
In addition, offset data produces module and is not limited to realize in the mode of computing circuit in the foregoing description, and compensation pixel data or compensation pixel driving voltage also can be changed generation by mode such as table look-up, and corresponding variation like this also belongs to scope of the present invention.
In sum, the present invention is provided with the computing circuit be used for producing character used in proper names and in rendering some foreign names agate offset data in data drive circuit, realizing the compensation of character used in proper names and in rendering some foreign names agate by the system clock of minimum and the character used in proper names and in rendering some foreign names agate voltage table of minimum number, and then improves the colour cast problem of LCD.In this case, the electromagnetic interference (EMI) that produced of the production cost of data driving chip of the present invention and clock signal can be lowered significantly.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (26)
1. data drive circuit that is used for a liquid crystal display with low color bias includes:
One sequence is used for receiving in regular turn a plurality of pixel datas to changing module side by side, and according to a data upload signal, exports these a plurality of pixel datas side by side;
One offset data produces module, is coupled to this sequence to changing module side by side, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas according to these a plurality of pixel datas;
One numeral is coupled to this sequence and produces module to changing module and this offset data side by side to the analog-converted module, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, respectively these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas is carried out numeral to analog-converted; And
Module is amplified in one computing, be coupled to this numeral to the analog-converted module, be used for the simulating signal exported according to this digital to analog converter module, generation is corresponding to a plurality of main pixel drive voltage of these a plurality of pixel datas and corresponding to a plurality of compensation pixel driving voltages of these a plurality of character used in proper names and in rendering some foreign names agate offset datas, to drive in this liquid crystal display with low color bias a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
2. data drive circuit as claimed in claim 1, wherein this offset data generation module comprises a plurality of computing circuits, is used for respectively these a plurality of pixel datas being carried out a functional operation, to produce these a plurality of character used in proper names and in rendering some foreign names agate offset datas.
3. data drive circuit as claimed in claim 2, wherein this functional operation is the computing of multivariate function.
4. data drive circuit as claimed in claim 3, wherein these a plurality of computing circuits are carried out the computing of these multivariate function according to a control signal.
5. data drive circuit as claimed in claim 1, wherein the quantity of these a plurality of character used in proper names and in rendering some foreign names agate offset datas is identical with the quantity of these a plurality of pixel datas.
6. data drive circuit that is used for a liquid crystal display with low color bias includes:
One sequence is used for receiving in regular turn a plurality of pixel datas to changing module side by side, and according to a data upload signal, exports these a plurality of pixel datas side by side;
One numeral is coupled to this sequence to changing module side by side to the analog-converted module, is used for these a plurality of pixel datas being carried out numeral to analog-converted, to produce a plurality of simulating signals according to a character used in proper names and in rendering some foreign names sign indicating number voltage table; And
One driving voltage produces module, is coupled to this numeral to the analog-converted module, includes:
A plurality of first operational amplifiers are coupled to this numeral to the analog-converted module, are used for respectively producing a plurality of main pixel drive voltage according to these a plurality of simulating signals; And
A plurality of second operational amplifiers are coupled to this numeral to the analog-converted module, are used for respectively producing a plurality of corresponding compensation pixel driving voltages according to these a plurality of simulating signals;
Wherein, these a plurality of main pixel drive voltage and this a plurality of corresponding compensation pixel driving voltages are used for driving in the LCD a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
7. data drive circuit as claimed in claim 6, wherein these a plurality of second operational amplifiers carry out a functional operation according to these a plurality of simulating signals respectively, to produce a plurality of corresponding compensation pixel driving voltages.
8. data drive circuit as claimed in claim 7, wherein this functional operation is the computing of multivariate function.
9. data drive circuit as claimed in claim 8, wherein these a plurality of second operational amplifiers are carried out the computing of these multivariate function according to a control signal.
10. data drive circuit as claimed in claim 6, wherein the quantity of these a plurality of second operational amplifiers is identical with the quantity of these a plurality of first operational amplifiers.
11. a data drive circuit that is used for a liquid crystal display with low color bias includes:
One shift register module, a plurality of pixel datas that are used for receiving in regular turn convert output arranged side by side to;
One offset data produces module, is coupled to this shift register module, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas according to these a plurality of pixel datas;
One data bolt-lock module, be coupled to this shift register module and this offset data and produce module, be used for storing these a plurality of pixel datas and these a plurality of corresponding character used in proper names and in rendering some foreign names agate offset datas, and, export these a plurality of pixel datas and these a plurality of corresponding character used in proper names and in rendering some foreign names agate offset datas according to a data upload signal;
One numeral is coupled to this data bolt-lock module to the analog-converted module, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, respectively these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas is carried out numeral to analog-converted; And
Module is amplified in one computing, be coupled to this numeral to the analog-converted module, be used for the simulating signal exported to the analog-converted module according to this numeral, generation is corresponding to a plurality of main pixel drive voltage of these a plurality of pixel datas and corresponding to a plurality of compensation pixel driving voltages of these a plurality of character used in proper names and in rendering some foreign names agate offset datas, to drive in this liquid crystal display with low color bias a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
12. data drive circuit as claimed in claim 11, wherein this offset data generation module comprises a plurality of computing circuits, is used for respectively these a plurality of pixel datas being carried out a functional operation, to produce these a plurality of character used in proper names and in rendering some foreign names agate offset datas.
13. data drive circuit as claimed in claim 12, wherein this functional operation is the computing of multivariate function.
14. data drive circuit as claimed in claim 13, wherein these a plurality of computing circuits are carried out the computing of these multivariate function according to a control signal.
15. data drive circuit as claimed in claim 11, wherein the quantity of this character used in proper names and in rendering some foreign names agate offset data is identical with the quantity of these a plurality of pixel datas.
16. a data drive circuit that is used for a liquid crystal display with low color bias includes:
One data input pin is used for receiving in regular turn a plurality of pixel datas;
One offset data generation unit is coupled to this data input pin, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas in regular turn according to these a plurality of pixel datas that receive in regular turn;
One first sequence is coupled to this data input pin to changing module side by side, is used for storing these a plurality of pixel datas, and according to a data upload signal, these a plurality of pixel datas of output arranged side by side;
One second sequence is coupled to this offset data generation unit to changing module side by side, is used for storing these a plurality of character used in proper names and in rendering some foreign names agate offset datas, and according to this data upload signal, these a plurality of character used in proper names and in rendering some foreign names agate offset datas of output arranged side by side;
One numeral is coupled to this first sequence to changing module and this second sequence side by side to conversion module arranged side by side to the analog-converted module, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, respectively these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas is carried out numeral to analog-converted; And
Module is amplified in one computing, be coupled to this numeral to the analog-converted module, be used for the simulating signal exported to the analog-converted module according to this numeral, generation is corresponding to a plurality of main pixel drive voltage of these a plurality of pixel datas and corresponding to a plurality of compensation pixel driving voltages of these a plurality of character used in proper names and in rendering some foreign names agate offset datas, to drive in this liquid crystal display with low color bias a plurality of main pixel and a plurality of corresponding compensation pixel corresponding to same row.
17. data drive circuit as claimed in claim 16, wherein this offset data generation unit is a computing circuit, be used for these a plurality of pixel datas that receive are in regular turn carried out a functional operation, to produce a plurality of character used in proper names and in rendering some foreign names agate offset datas in regular turn corresponding to these a plurality of pixel datas.
18. data drive circuit as claimed in claim 17, wherein this functional operation is the computing of multivariate function.
19. data drive circuit as claimed in claim 18, wherein this computing circuit is carried out the computing of these multivariate function according to a control signal.
20. data drive circuit as claimed in claim 16, wherein the quantity of this character used in proper names and in rendering some foreign names agate offset data is identical with the quantity of these a plurality of pixel datas.
21. a data drive circuit that is used for a liquid crystal display with low color bias includes:
One shift register module, a plurality of pixel datas that are used for receiving in regular turn convert output arranged side by side to;
One offset data produces module, is coupled to this shift register module, is used for producing a plurality of character used in proper names and in rendering some foreign names agate offset datas corresponding to these a plurality of pixel datas according to these a plurality of pixel datas;
All die change groups are coupled to this shift register module and this offset data and produce module, are used for switching these a plurality of pixel datas of output and these a plurality of character used in proper names and in rendering some foreign names agate offset datas;
One numeral is coupled to this switching module to the analog-converted module, is used for according to a character used in proper names and in rendering some foreign names sign indicating number voltage table, and these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas of this switching output that module switches are carried out numeral to analog-converted; And
Module is amplified in one computing, is coupled to this numeral to the analog-converted module, is used for the simulating signal exported to the analog-converted module according to this numeral, produces a plurality of driving voltages, to drive in this liquid crystal display with low color bias a plurality of pixels corresponding to same row.
22. data drive circuit as claimed in claim 21, wherein this offset data generation module comprises a plurality of computing circuits, is used for respectively these a plurality of pixel datas being carried out a functional operation, to produce these a plurality of character used in proper names and in rendering some foreign names agate offset datas.
23. data drive circuit as claimed in claim 22, wherein this functional operation is the computing of multivariate function.
24. data drive circuit as claimed in claim 23, wherein these a plurality of computing circuits are carried out the computing of these multivariate function according to a control signal.
25. data drive circuit as claimed in claim 21, it comprises a data bolt-lock module in addition, be coupled to this switching module and this numeral between the analog-converted module, be used for storing these a plurality of pixel datas and these a plurality of character used in proper names and in rendering some foreign names agate offset datas of this switching output that module switches, and, export these a plurality of pixel datas or this a plurality of corresponding character used in proper names and in rendering some foreign names agate offset datas according to a data upload signal.
26. data drive circuit as claimed in claim 21, it comprises in addition:
One first data bolt-lock module is coupled between this shift register module and this switching module, is used for storing these a plurality of pixel datas, and according to a data upload signal, exports this a plurality of pixel datas; And
One second data bolt-lock module is coupled to this offset data and produces between module and this switching module, is used for storing these a plurality of character used in proper names and in rendering some foreign names agate offset datas, and according to this data upload signal, exports this a plurality of character used in proper names and in rendering some foreign names agate offset datas.
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| CN102956205B (en) * | 2011-08-17 | 2015-10-28 | 群康科技(深圳)有限公司 | Driver module and liquid crystal indicator |
| CN102592557B (en) * | 2012-03-01 | 2014-07-09 | 深圳市华星光电技术有限公司 | Simulation method and device for squint angle images |
| CN105023539B (en) * | 2015-07-10 | 2017-11-28 | 北京大学深圳研究生院 | Offset peripheral system, method and the display system of a kind of picture element matrix |
| CN105388646B (en) * | 2015-12-14 | 2019-02-12 | 深圳市华星光电技术有限公司 | The color offset compensating method of liquid crystal display and liquid crystal display |
| CN107358926A (en) * | 2017-07-24 | 2017-11-17 | 惠科股份有限公司 | Driving method, drive device and the display device of display panel |
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| CN1351323A (en) * | 2000-10-31 | 2002-05-29 | 松下电器产业株式会社 | Display device and driving method thereof, and display pattern evaluation for sub-element of picture |
| US7233305B1 (en) * | 2003-06-11 | 2007-06-19 | Alta Analog, Inc. | Gamma reference voltage generator |
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