WO2015000239A1 - 伽马电压产生电路及其控制方法、液晶显示器 - Google Patents
伽马电压产生电路及其控制方法、液晶显示器 Download PDFInfo
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- WO2015000239A1 WO2015000239A1 PCT/CN2013/084999 CN2013084999W WO2015000239A1 WO 2015000239 A1 WO2015000239 A1 WO 2015000239A1 CN 2013084999 W CN2013084999 W CN 2013084999W WO 2015000239 A1 WO2015000239 A1 WO 2015000239A1
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- operational amplifier
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 13
- 230000008569 process Effects 0.000 abstract description 11
- 230000010354 integration Effects 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 20
- 238000004590 computer program Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Definitions
- the invention relates to display technology
- the function of the gamma voltage generating circuit is to set the Gamma voltage according to the Gamma curve required for the liquid crystal display, and to use it as a voltage for gray scale display of the thin film transistor liquid crystal display.
- Each Gamma voltage produces all grayscale voltages under the action of the digital-to-analog converter of the source driver.
- the Gamma voltage generating circuit in the liquid crystal display is generally placed in a source driver IC, and each of the required Gamma voltage values is generated by a resistor voltage division method, wherein 8 (VI, V2. ..V7,V8) or 14 (VI, V2...V13,V14) voltage nodes lead the mountain! w ⁇ P input, as shown in Figure 1, Figure 2, Figure I is the Source Driver IC Includes Gamma voltage generation circuitry, Gamma lookup table, and source driver (Source Driver).
- the existing Gamma voltage generating circuit requires a large number of resistors, for example, a 6-bit source driver IC requires 129 resistors, an 8-bit source driver IC requires 257 resistors, and a large number of resistors occupy ffi Source. Dnver IC has more space; and in order to improve the gray scale display characteristics of the display, it is necessary to increase the number of Gamma voltages, and the existing Gamma voltage generating circuit requires a Gamma voltage generating circuit that requires more resistors to generate the need. The number of Gamma voltages is not conducive to the integration of the Source Driver IC, process complexity and cost reduction.
- the embodiment of the invention provides a gamma voltage generating circuit, a control method thereof, and a liquid crystal display, which are used to solve the problem that the number of resistors constituting the gamma voltage generating circuit in the prior art is large, which is disadvantageous to
- Source Driver IC The integration of the Source Driver IC and the process complexity of fabricating the source driver IC are reduced.
- the gamma voltage generating circuit includes: an output end, a first reference voltage input end, a second reference voltage input end, a pre-stage voltage dividing circuit having a first pre-stage output end and a second pre-stage output end, and a post-stage voltage dividing circuit having a first rear stage input terminal, a second rear stage input end, and a rear stage output end; wherein:
- the first reference voltage input end and the second reference voltage input end are respectively connected to the front stage voltage dividing circuit; the front stage voltage dividing circuit is connected to the rear stage voltage dividing circuit; a voltage circuit connected to the output end of the gamma voltage generating circuit;
- a first front stage output end of the front stage voltage dividing circuit is connected to the first rear stage input end, and a second front stage output end of the front stage voltage dividing circuit is connected to the second back stage input end, ⁇ respectively dividing a reference voltage input from the first reference voltage input terminal and the second reference voltage input terminal to generate a main gamma voltage;
- the output terminal of the subsequent stage of the voltage divider circuit is coupled to the output of the gamma voltage generating circuit for dividing the main gamma voltage to generate a secondary gamma voltage.
- the main turning voltage is divided by a post-stage voltage dividing circuit to generate a secondary turning voltage; the output of the gamma voltage generating circuit outputs a required turning voltage.
- the liquid crystal display provided by the present embodiment includes the tumbling voltage generating circuit as described above.
- the pre-stage voltage dividing circuit multiplexes the pre-stage voltage dividing circuit, it is possible to generate more gamma voltage values by using fewer components for voltage division. and then
- Source Driver IC The integration of the Source Driver IC is relatively easy, reducing the process complexity of fabricating the source driver IC.
- 1 is a structural block diagram of a Source Driver IC in the background art
- FIG. 2 is a Gamma voltage generating circuit diagram in the Source Driver IC in the background art
- FIG. 3 is a diagram of a Gamma voltage generating circuit in the first embodiment of the present invention
- FIG. 4 is a diagram showing a Gamma voltage generating circuit in the first embodiment of the present invention.
- FIG. 5 is a circuit diagram of a Gamma voltage generating circuit in Embodiment 2 of the present invention.
- Fig. 6 is a circuit diagram of a Gamma voltage generating circuit in the second embodiment of the present invention.
- FIG. 3 it is a circuit diagram of a Gamma voltage generating circuit in the first embodiment of the present invention. It should be noted that Al in FIG. 3 respectively represents resistances R Q , R 2 , ⁇
- connection point where R 14 is connected to switches S 2 and S 3 to S M , B3 and BI O represent intersections of circuits in the pre-stage voltage dividing circuit 10, and El, E2 E17 respectively represent resistances, r 2 to r n A connection point connected to the switches S1 , s 2 to s i 7 .
- the number of pre-resistors included in the previous-stage voltage dividing circuit 10 is N::::15 (see, ,, Ry-R 14 in FIG. 3), and the subsequent stage included in the post-stage voltage dividing circuit 20
- the number of resistors M::::16 is taken as an example (see r[ , r 2 , y—r i6 in Figure 3).
- the Gamma voltage generation circuit includes: output terminal HU, first reference voltage input terminal A0, second a reference voltage input terminal A15, a pre-stage voltage dividing circuit 10, and a post-stage voltage dividing circuit 20; wherein:
- the first reference voltage input terminal AO and the second reference voltage input terminal AI 5 are respectively connected to the pre-stage voltage dividing circuit 10; the pre-stage voltage dividing circuit 10 is connected to the rear stage voltage dividing circuit 20 The rear stage voltage dividing circuit 20 is connected to the output terminal Hi of the gamma voltage generating circuit;
- the front stage voltage dividing circuit 10 has a first front stage output terminal D1 and a second front stage output terminal D2;
- the rear stage voltage dividing circuit 20 has a first rear stage input terminal E1, a second rear stage input terminal E17, and In-level output GI;
- the second pre-stage output terminal D2 of the pre-stage voltage dividing circuit 10 is connected to the second post-stage input terminal E17 for inputting from the first reference voltage input terminal AO and the second reference voltage input terminal A15.
- the reference voltage is divided separately to generate a main gamma voltage.
- the main gamma voltage is generated by the pre-stage voltage dividing circuit 10, and the pre-stage voltage dividing circuit 10 divides the first reference voltage and the second reference voltage into a set number of main voltages, which are generated by the entire gamma voltage. first step.
- the voltage input to the first reference voltage input terminal AO may be a positive power supply voltage AVDD; the voltage input to the second reference voltage input terminal A15 may be 0, that is, the second reference voltage input terminal A 15 is grounded, such as As shown in FIG. 3, the input voltage of the second reference voltage input terminal A15 may also be a power supply voltage - AVDD having a phase opposite to the input voltage of the first reference voltage input terminal AO and having the same amplitude.
- the rear stage output terminal G1 of the post-stage voltage dividing circuit 20 is connected to the output terminal Hi of the Gamma voltage generating circuit for dividing the main gamma voltage to generate a sub-gamma voltage.
- the sub gamma voltage is a final required gamma voltage obtained by second dividing the voltage by the second stage voltage dividing circuit 20 for each of the set number of the main voltages generated.
- the pre-stage voltage dividing circuit 10 includes: a 0th pre-stage resistor R. ⁇ Nth front-end resistors ⁇ ⁇ a pre-stage resistor, a first switch group (ie, a first pre-stage switch Si to an N-th pre-stage switch 8 ⁇ a total of N pre-stage switches) and a first pre-stage operational amplifier OP Fl ⁇ second pre-amplifier. ? ⁇ A total of 2 pre-amplifiers;
- the ⁇ pre-stage resistors are connected in series (for example, please refer to the front-end resistors in the FIG. 3, and ⁇ 4 in series), and the end of the 0-th pre-resistor that is not connected to the first pre-stage resistor ( For example, please refer to the AO terminal in FIG. 3) connected to the first reference voltage input terminal AO, and the end of the Nth pre-stage resistor 3 ⁇ 4 not connected to the N-th pre-stage resistor 3 ⁇ 4.i and the second reference voltage input terminal. A15 is connected;
- the n - th front-stage switch S n - terminal is connected to a common node between the ⁇ -1 pre-resistor and the n - th pre-resistance (for example, see FIG. 3, one end of the switch S3 is connected to the pre-resistor and the pre-resistance
- the common node A3 is connected, or the end of the switch S 10 is connected to the common node A10 between the front-stage resistor and the front-end resistor R i() , and the other end of the n-th front-stage switch S K is connected to the first pre-stage
- the operational amplifier OP fl is connected to the non-inverting input terminal of the second pre-operational amplifier ⁇ ⁇ , and the value range of the ⁇ is A positive integer greater than or equal to 1 and less than or equal to N+1, and N is a positive integer greater than 1.
- the first front-stage switch S n the other end of the second front-stage operational amplifier ⁇ ⁇ -inverting input terminal is connected to (e.g., 10, the other terminal of the switch S 10 is connected to the second front-stage operational amplifier ⁇ ⁇ -phase input terminal).
- a first pre-inverting input terminal of the operational amplifier OP fi before the first stage of the operational amplifier OP fi output terminal (e.g., the first stage before the output of the operational amplifier OP f C 1) are connected with the first front stage output
- the terminals (eg, the first pre-stage output D1 in FIG. 3) are connected, and the inverting input terminal of the second pre-stage operational amplifier 0 ⁇ ⁇ and its output are both connected to the second pre-stage output (eg, in FIG. 3
- the second preamp output D2) is connected.
- the post-stage voltage dividing circuit 20 includes: a first post-stage resistor ⁇ to a second-order post-stage resistor 3 ⁇ 4, a plurality of post-stage resistors, and a second switch group (ie, an i-th post-stage switch s wide ⁇ rear-stage switch s M + a total of M + 1 after-stage switch) and the first post-stage operational amplifier ⁇ R rear-stage operational amplifier, a total of R post-operational amplifiers, the R is a positive integer greater than or equal to 1, the circuit diagram shown in Figure 3 The number of stage operational amplifiers is one.
- the M rear-level resistors are connected in series (for example, please refer to the rear-stage resistors in FIG. 3! ⁇ , ... r i 6 in series), and the first-stage resistor r :i is not connected to the second-stage.
- One end of the resistance connection is connected to the first rear stage input terminal (for example, see E1 end in FIG. 3), and the end of the Mth rear stage resistance r M is not connected to the M-1 first stage resistance r M .
- the second rear stage input (for example, see E17 end in Fig. 3) is connected;
- first rear stage switch S1 One end of the first rear stage switch S1 is connected to the first rear stage input end (for example, see the E1 end in FIG. 3), and the other end of the first rear stage switch and the R rear stage operational amplifiers
- the non-inverting input of any of the post-stage operational amplifiers (for example, the non-inverting input terminal F1 of the post-operating amplifier OP E . ) is connected to one end of the second and subsequent stages of the switch S M (for example, Please refer to the terminal end of FIG.
- the other end of the second stage rear switch S M+1 and the non-inverting operational amplifier of any one of the R rear stage operational amplifiers (for example, The non-inverting input terminal F1 of the operational amplifier OP E is connected; Connected to a common node between one end of the rear stage switches S m m m- 1 after the first stage resistor and the m-stage resistor R & lt m (e.g., an end of the switch S3 and the rear stage resistor ⁇ 2 and the rear stage resistor between connected ⁇ 3 common node), any of the other end of the m-stage switch S m and said R a subsequent stage of the operational amplifier in a same subsequent stage of the operational amplifier inverting input connected to the terminal (e.g., the other terminal of the switch S3 and the rear stage The non-inverting input terminal F1 of the operational amplifier OP is connected), and the value range of the m is greater than or equal to! And a positive integer less than or equal to M+1, where M is
- the integration of the source driver Preferably, in order to reduce the number of operational amplifiers in the latter stage, it is advantageous for the integration of the source driver.
- the number R of the latter operational amplifiers in the subsequent voltage divider circuit is] at this time, all the subsequent voltage divider circuits are
- the other end of the stage switch is connected to the non-inverting input of the latter operational amplifier , as shown in FIG.
- An output of each of the rear operational amplifiers of the R operational amplifiers and an output of each of the R operational amplifiers is connected to the output of the latter stage (for example, the output stage Hi of Fig. 3), and the output of the latter stage is connected to the output of the gamma voltage generating circuit.
- the post-stage voltage dividing circuit 20 multiplexes the pre-stage voltage dividing circuit 10, in the pre-stage voltage dividing circuit 10 and
- the stage voltage dividing circuit 20 (more specifically, the first switch group in the pre-stage voltage dividing circuit 10 and the second switch group in the post-stage voltage dividing circuit 20) can be used with less resistance. Producing more gamma voltage values and reducing the number of Gamma resistors facilitates the integration of high-level Source Driver ICs and reduces the process complexity of making Source Driver ICs.
- the voltage input by the first reference voltage input terminal A0 is a positive power supply voltage AVDD
- the second reference voltage input terminal A15 is grounded to GND as an example.
- the second reference voltage input is The power supply voltage input to the terminal A15 can also be -AVDD.
- the end of the N/2 pre-stage switch S N/2 that is not connected to the first pre-stage operational amplifier or the second pre-stage operational amplifier can be grounded, and One end of the ( ⁇ /2 ⁇ ) pre-stage switch S N/2 — that is not connected to the first pre-stage operational amplifier or the second pre-stage operational amplifier is grounded, and the connection relationship between the other components is unchanged.
- the Gamma voltage generating circuit in FIG. 3 can be referred to as a 2-stage multiplexing circuit. In order to generate more Gamma voltage values, a multiplexing circuit of 3 stages or more can also be used. At this time, based on the circuit shown in FIG. , at least one of the first intermediate input Z output and the second intermediate transfer may be added.
- the intermediate-stage voltage dividing circuit 30 of the input/output terminal is shown in FIG. 4, and FIG. 4 is shown by adding two intermediate-stage voltage dividing circuits, and the circuit diagram and the first one in the second intermediate-stage voltage dividing circuit are shown.
- the circuit diagram in the intermediate stage voltage dividing circuit is similar. The specific structure of the second intermediate stage voltage dividing circuit is not shown in FIG. 4, and only the second intermediate stage voltage dividing circuit and the first intermediate stage voltage dividing circuit are shown.
- the connection relationship of the post-stage voltage dividing circuit wherein:
- a first intermediate stage input end of the intermediate stage voltage dividing circuit 30 (for example, a first intermediate stage input terminal Emi) and a first output end of the upper stage voltage dividing circuit (for example, the first stage of the upper stage voltage dividing circuit)
- the output terminal D1) is connected to the second intermediate stage input terminal (for example, the first intermediate stage input terminal Em(k+1) and the second output end of the upper stage voltage dividing circuit (for example, the first stage voltage dividing circuit)
- An output terminal D2) is connected, and the first intermediate stage output terminal (for example, the first intermediate stage output terminal Dml shown in FIG. 4) is connected to the first input terminal of the next stage voltage dividing circuit, and the second intermediate stage output terminal is connected.
- the second intermediate stage output terminal Dm2 shown in FIG. 4 is connected to the second input terminal of the next stage voltage dividing circuit for dividing the voltage output from the upper stage voltage dividing circuit.
- the post-stage voltage dividing circuit 20 is specifically configured to divide the voltage outputted by the upper-stage voltage dividing circuit to generate a sub-gamma voltage.
- the above-mentioned upper stage voltage dividing circuit is the previous stage.
- the voltage dividing circuit, the first output end of the upper voltage dividing circuit is the first front stage output end, and the second output end of the upper stage voltage dividing circuit is the second front stage output end;
- the circuit is the post-stage voltage dividing circuit, the first input end of the next-stage voltage dividing circuit is the first rear-stage input end, and the second input end of the next-stage voltage dividing circuit is the second post-stage input end.
- two intermediate voltage dividing circuits having a first intermediate stage input/output terminal and a second intermediate stage input/output terminal are added (first intermediate stage partial voltage)
- the intermediate stage voltage dividing circuit is the first intermediate stage voltage dividing circuit
- the above-mentioned upper voltage dividing circuit is the front stage voltage dividing circuit
- the first stage voltage dividing circuit The first output end of the circuit is the first pre-stage output end, and the second output end of the upper-stage voltage dividing circuit is the second pre-stage output end
- the second-stage voltage dividing circuit is the second intermediate stage partial voltage Circuit
- the first input end of the next-stage voltage dividing circuit is the first intermediate stage input end of the second intermediate stage voltage dividing circuit
- the second input of the next stage voltage dividing circuit is the second intermediate stage voltage dividing circuit
- the input end is the second intermediate stage input end of the second intermediate stage voltage dividing circuit; when the intermediate stage voltage dividing circuit is the second intermediate stage voltage dividing circuit, the above first
- the first intermediate stage input end of the intermediate stage voltage dividing circuit 30 is connected to the first front stage output end, the second intermediate stage input end and the second front stage output end, including only one intermediate stage voltage dividing circuit 30 days. Connected, the first intermediate stage output end is connected to the first rear stage input end, and the second intermediate stage output end is connected to the second rear stage input end;
- the intermediate stage voltage dividing circuit 30 includes: a first intermediate stage resistor R ml to a Kth intermediate stage resistor iK K intermediate stage resistors, and a first intermediate switch group (ie, a first intermediate stage switch S mi ⁇ K+1 intermediate stage switch ⁇ intermediate stage switch) and first intermediate stage operational amplifier OP m5 , second intermediate stage operational amplifier 0? ⁇ 2 intermediate stage operational amplifiers;
- the K intermediate resistors are serially connected in series, and one end of the first intermediate resistor not connected to the second intermediate resistor R ni2 is connected to the first intermediate input terminal, and the Kth intermediate resistor R niK is not intermediate with the K-1 Class resistance! One end of the ⁇ connection is connected to the second intermediate input;
- first intermediate stage switch is connected to the first intermediate stage input end, and the other end of the ith intermediate stage switch is connected to the non-inverting input end of the first intermediate stage operational amplifier or the second intermediate stage operational amplifier;
- One end of the intermediate stage switch is connected to the second intermediate stage input end, and the other end of the K+i intermediate stage switch is connected to the non-inverting input end of the first intermediate stage operational amplifier or the second intermediate stage operational amplifier, the kth intermediate stage One end of the switch is connected to a common node between the k-1th intermediate resistor and the kth intermediate resistor, and the other end of the kth intermediate switch is connected to the noninverting input of the first intermediate operational amplifier or the second intermediate operational amplifier Connected, the value range of k is a positive integer greater than I and less than or equal to ⁇ , and ⁇ is a positive integer greater than i;
- An inverting input terminal of the first intermediate operational amplifier ⁇ ⁇ and an output terminal of the first intermediate operational amplifier OP mi are connected to the first intermediate stage output terminal, and an inversion of the second intermediate stage operational amplifier OP m2 The input end and its output end are both connected to the second intermediate stage output end.
- one end of the first intermediate stage switch Seni is connected to the first intermediate stage input end, first!
- the other end of the intermediate stage switch S mi is connected to the non-inverting input terminal of the first intermediate stage operational amplifier OP nii ;
- the K+1 intermediate stage switch S m (K+i ⁇ terminal is connected to the second intermediate stage input end, When ⁇ + ⁇ is an odd number, the other end of the third +!
- intermediate stage switch S ra(K ) is connected to the non-inverting input of the first intermediate stage operational amplifier OP mi , and when K 1 is even, the middle of K+1 the other end of switch S ⁇ K ⁇ level of the second intermediate stage of the operational amplifier oP m2 is connected to the inverting input terminal;
- the kth intermediate stage switch S snk - terminal is connected to a common node between the k-1th intermediate resistor R ra (k . O and the kth intermediate resistor, when k is an odd number, the kth intermediate stage switch S mk The other end is connected to the non-inverting input of the first intermediate stage operational amplifier OP mi , and when k is even, the other end of the kth intermediate stage switch S mk is connected to the non-inverting input of the second intermediate stage operational amplifier OP m2 ,
- the value range of k is a positive integer greater than or equal to 1 and less than or equal to ⁇ , and ⁇ is a positive integer greater than i.
- the Gamma voltage generation circuit shown in FIG. 3 and FIG. 4 can all be integrated in the Source Driver IC, or can be partially integrated in the Source Driver IC. Compared with the prior art, the number of resistors is reduced, which is beneficial to Source. Driver IC integration, better, can integrate the post-stage voltage divider circuit in Figure 3 or Figure 4 inside the Source Driver IC, which further reduces the number of resistors integrated in the Source Driver IC, further reducing The process complexity of making the Source Driver IC is reduced.
- the number of resistors should be balanced as much as possible.
- the value of N is 8, and the value of M is 16; in Source Driver When the IC is 8 bits, the value of N is 16 and the value of M is 16.
- a Gamma voltage generating circuit includes: an output terminal Hi, a reference voltage input terminal A0, a first preamplifier output terminal D1, and a second preamplifier output.
- the output terminals (Q1, Q2) of the rear stage voltage dividing circuit 200 are connected to the output terminal HI of the Gamma voltage generating circuit for dividing the voltage of the main hummer to generate a sub-horse voltage;
- the pre-stage voltage dividing circuit 100 includes: a 0th pre-stage resistor to an N-th pre-stage resistor, a total of N+1 pre-resistors, a first pre-stage switch S, a N-th pre-stage switch 8, a total of N pre-stage switches, and a first a pre-stage operational amplifier OP fi ⁇ a second pre-stage operational amplifier ⁇ ⁇ 2 pre-operational amplifiers; the N+1 pre-stage resistors are sequentially connected in series, and the 0th pre-stage resistor is not connected to the first pre-stage resistor Connected to the reference voltage input terminal, the first connection of the first pre-stage resistor not connected to the N 1 pre-stage resistor R N ..i is grounded to GND;
- One end of the nth front stage switch is connected to a common node between the first front stage resistor and the nth front stage resistor, and ⁇ is an odd number ⁇ , the other end of the second front stage switch Sn and the first front stage operational amplifier OP fl the inverting input terminal is connected, when ⁇ is an even number, the other end of the inverting input terminal of the previous stage II of the second switch S n previous stage of the operational amplifier is connected ⁇ ⁇ , the ⁇ is in the range of less than or equal to 1 a positive integer of N+1, ⁇ is a positive integer greater than one;
- the post-stage voltage dividing circuit 200 includes: an ith post-stage resistor ⁇ a M-th-level resistor ⁇ a total of a post-stage resistor, an ith post-stage switch Si ⁇ a ⁇ ⁇ ⁇ post-stage switch s M+1 a total M +1 post-stage switch and first post-stage operational amplifier OP fi ⁇ second post-stage operational amplifier ⁇ ⁇ 2 post-stage operational amplifiers; the subsequent post-stage resistors are sequentially connected in series, and the first post-stage resistor 1 ⁇ One end connected to the second post-stage resistor is connected to the first post-stage input end, and one end of the second post-stage resistor r M not connected to the M i rear-stage resistor r M4 is connected to the second post-stage input end. ;
- One end of the i-th rear stage switch S1 is connected to the first rear stage input end, and the other end is connected to the non-inverting input end of the first post-stage operational amplifier OPd ; the end of the M+1 rear stage switch S M+[ The second rear stage input terminal is connected. When M+i is odd, the other end is connected to the first post stage operational amplifier OP ri The non-inverting input terminal is connected, and when M+1 is even, the other end thereof is connected to the non-inverting input terminal of the second post-stage operational amplifier ⁇ ;
- the other end of the m-th stage switch after the first m The non-inverting input terminal of the operational amplifier OP ri is connected.
- the other end of the mth rear-stage switch s m is connected to the non-inverting input terminal of the second post-stage operational amplifier OP f2 , and the value range of the m is a positive integer greater than or equal to 1 less than or equal to M+1, and M is a positive integer greater than one;
- An inverting input end of the first post-stage operational amplifier OP fi and an output end thereof are connected to the output end of the rear stage, and an inverting input end of the second post-stage operational amplifier OP f2 and an output end thereof are connected to the output end of the rear stage,
- the output of the subsequent stage is connected to the output of the Gamma voltage generating circuit.
- the post-stage voltage dividing circuit multiplexes the pre-stage voltage dividing circuit, and under the joint action of the pre-stage voltage dividing circuit and the switching of the post-stage voltage dividing circuit, the resistance is reduced. That is, it can generate more Gamma voltage values, and the number of Gamma resistors is reduced, which is beneficial to the integration of the Source Driver IC, and can reduce the process complexity of the Source Driver IC.
- the Gamma voltage generating circuit in FIG. 5 can be referred to as a 2-stage multiplexing circuit.
- a multiplexing circuit of 3 stages or more can also be used.
- At this time based on the circuit shown in FIG.
- the voltage circuit is illustrated.
- the circuit diagram in the second intermediate stage voltage dividing circuit is similar to the circuit diagram in the first intermediate stage voltage dividing circuit.
- the specific structure of the second intermediate stage voltage dividing circuit is not shown in FIG. a connection relationship between the second intermediate-stage voltage dividing circuit and the first intermediate-stage voltage dividing circuit and the subsequent-stage voltage dividing circuit, wherein:
- the first intermediate stage input end of the intermediate stage voltage dividing circuit is connected to the first output end of the upper stage voltage dividing circuit, and the second intermediate stage input end is connected to the second output end of the upper stage voltage dividing circuit, first The intermediate stage output end is connected to the first input end of the next stage voltage dividing circuit, and the second intermediate stage output end is connected to the second input end of the next stage voltage dividing circuit;
- an intermediate-stage voltage dividing circuit 300 ⁇ having a first intermediate-stage input/output terminal and a second intermediate-stage input Z-output terminal is added, and the above-mentioned upper-stage voltage dividing circuit is a pre-stage The voltage dividing circuit, the first output end of the upper voltage dividing circuit is the first front stage output end, the upper level is divided
- two intermediate voltage dividing circuits having a first intermediate stage input/output terminal and a second intermediate stage input/output terminal are added (the first intermediate stage voltage dividing circuit and the second intermediate stage).
- the voltage dividing circuit is 300
- the intermediate voltage dividing circuit is the first intermediate voltage dividing circuit
- the above-mentioned upper voltage dividing circuit is the front voltage dividing circuit
- the first output terminal of the upper voltage dividing circuit That is, the first front stage output end, the second output end of the upper stage voltage dividing circuit is the second front stage output end
- the second stage voltage dividing circuit is the second intermediate stage voltage dividing circuit
- the next stage is divided into
- the first input end of the voltage circuit is the first intermediate stage input end of the second intermediate stage voltage dividing circuit
- the second input end of the second stage voltage dividing circuit is the second intermediate stage input of the second intermediate stage voltage dividing circuit
- the intermediate-stage voltage dividing circuit is the second intermediate-stage voltage dividing circuit
- the first-stage voltage dividing circuit is the first intermediate-stage voltage dividing circuit
- the first output end of the upper-stage voltage dividing circuit is the first a first intermediate stage output of an intermediate stage voltage dividing circuit, a first stage divided piezoelectric
- the first intermediate stage input end of the intermediate stage voltage dividing circuit 300 is connected to the first front stage output end, and the second intermediate stage input end is connected to the second front stage output end.
- the first intermediate stage output end is connected to the first rear stage input end, and the second intermediate stage output end is connected to the second rear stage input end;
- the intermediate stage voltage dividing circuit 300 comprising: a first intermediate stage resistor R snl ⁇ K intermediate stage of a total resistance R nsK K intermediate level resistance, a first intermediate stage switch S mi ⁇ K + 1 first intermediate stage switch S m ( K — ) a total of +1 intermediate stage switches and a first intermediate stage operational amplifier OP mi ⁇ a second intermediate stage operational amplifier ⁇ ⁇ 2 total of 2 intermediate stage operational amplifiers;
- the intermediate resistors are sequentially connected in series, and one end of the first intermediate resistor not connected to the second intermediate resistor 1 ⁇ 2 is connected to the first intermediate input terminal, and the Kth intermediate resistor ⁇ is not in the middle of the first ⁇ -1 Class resistance!
- One end of the ⁇ connection is connected to the second intermediate input;
- One end of the first intermediate stage switch s ml is connected to the first intermediate stage input end, and the other end is connected to the non-inverting input end of the first intermediate stage operational amplifier OP ml ;
- the third ⁇ + ⁇ intermediate stage switch s m0 ⁇ + i ) One end is connected to the second intermediate stage input terminal, and when K+1 is an odd number, the other end is connected to the non-inverting input end of the first intermediate stage operational amplifier OP mi .
- K+! is even, the other end is the second intermediate stage of the operational amplifier 0P ra2 connected to the noninverting input terminal;
- the kth intermediate stage switch S ⁇ - terminal is connected to the common node between the first intermediate stage resistor ⁇ .. ⁇ and the kth intermediate stage resistor R snk .
- the other end of the kth intermediate stage switch S rak Connected to the non-inverting input of the first intermediate stage operational amplifier OP ml
- the other end of the kth intermediate stage switch s rak is connected to the non-inverting input of the second intermediate stage operational amplifier OP m2 when k is an even number
- the k The value ranges from 1 to greater than or equal to a positive integer of K 1
- ⁇ is a positive integer greater than 1.
- An inverting input end of the first intermediate operational amplifier OP mi and an output end thereof are connected to the first intermediate stage output end, and an inverting input end of the second intermediate stage operational amplifier OP ni2 and an output end thereof are both opposite to the second intermediate The stage outputs are connected.
- the Gamma voltage generation circuit shown in FIG. 5 and FIG. 6 can be integrated in the Source Driver IC, or can be partially integrated in the Source Driver IC. Compared with the prior art, the number of resistors is reduced, which is beneficial to Source. Driver IC integration, better, can integrate the post-stage voltage divider circuit in Figure 5 or Figure 6 inside the Source Driver IC, which further reduces the number of resistors integrated in the Source Driver IC, further reducing The process complexity of making a Source Driver IC.
- the value of N is 8, and the value of M is 16; when the Source Driver IC is 8 bits, the value of N is 16, and the value of the M is 16.
- the Source Driver IC is 8Wt
- the intermediate voltage divider circuit is included, and the value of N is 8, and the value of K is 8, and the value of M is 4.
- a method for controlling the gamma voltage generating circuit in the first embodiment or the second embodiment is provided in the embodiment of the present invention.
- the control method of the Gamma voltage generating circuit includes: The source driver determines the required gamma voltage;
- the main turbulent voltage is divided by a post-stage voltage dividing circuit to generate a secondary hummer voltage; the output of the gamma voltage generating circuit outputs a required humus voltage.
- the secondary gamma voltage is a tumbling voltage required by the source driver
- the front stage voltage dividing circuit includes a first switch group
- the rear stage voltage dividing circuit includes a second switch group
- the source driver determines the required Gamma voltage value, and determines the switch group corresponding to the required Gamma voltage value according to the correspondence between the switch group and the Gamma voltage value, and closes the corresponding switch group.
- the correspondence between the above switch group and the Gamma voltage value can be stored in the Gamma lookup table in the block diagram of the Source Driver IC shown in FIG.
- the switch group can include the first switch group, the second switch group, the first intermediate switch group, and the switch that needs to be added when a certain voltage divider circuit needs to be added; the correspondence between the switch group and the gamma voltage value
- the relationship refers to a general term for the correspondence relationship of the gamma voltage values corresponding to a single switch or a plurality of switches in each of the gradation voltage generating circuits (for example, the pre-stage voltage dividing circuit) in the gamma voltage generating circuit.
- the switch group can be determined according to the actual required Gamma voltage and the Gamma voltage generating circuit, so that the determined switch group outputs the actually required Gamma voltage when it is closed (others are in an open state).
- Vfn the Gamma voltage generating circuit shown in FIG. 3 as an example
- V[3] S2, S3, sl6 are closed;
- V[4] : S2, S3, s!5 are closed;
- V[5] S2, S3, sl4 are closed;
- V[6] S2, S3, s!3 closed;
- Vm S2, S3, sl2 are closed
- V[10] : , S3, s9 are closed;
- V[12]: S2, S3, s7 are closed;
- V[13j: S2, S3, s6 are closed;
- V[14] S2, S3, s5 are closed;
- V[17]: S2, S3, s2 are closed;
- V[20] : S3, S4, s3 are closed;
- V[23]: S3, S4, s6 are closed;
- V[24] S3-, S4, s7 i3 ⁇ 4j;
- V[25]: S3, S4, s8 are closed;
- V[26]: S3, S4, s9 are closed;
- V[39] : S4, S5, s!2 are closed;
- V[41] S4, S5, slO are closed;
- V[42]: S4, S5, s9 are closed;
- V[48] : S4, S5, s3 are closed;
- the embodiment of the invention further provides a liquid crystal display, which may include the tumbling voltage generating circuit described in the first embodiment, the second embodiment or the third embodiment.
- Other components of the liquid crystal display of the fourth embodiment are similar to those of the conventional liquid crystal display except for the above-described gamma voltage generating circuit, and therefore will not be described again.
- embodiments of the present application can be provided as a method, system, or computer program product.
- the application can take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware.
- the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer program code.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
Description
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CN103646634B (zh) * | 2013-11-28 | 2016-04-20 | 北京京东方光电科技有限公司 | Gamma参考电压产生电路、源极驱动器及显示装置 |
CN103745695B (zh) * | 2013-12-02 | 2016-03-30 | 深圳市华星光电技术有限公司 | Gamma电压驱动电路、源极驱动模块以及液晶面板 |
CN104021771B (zh) * | 2014-06-17 | 2017-02-15 | 深圳市华星光电技术有限公司 | 一种可编程伽玛校正缓冲电路芯片及产生伽马电压的方法 |
CN109658896B (zh) * | 2019-02-25 | 2021-03-02 | 京东方科技集团股份有限公司 | 一种伽马电压生成电路、驱动电路以及显示装置 |
CN112485683A (zh) * | 2020-11-18 | 2021-03-12 | 深圳芯典半导体科技有限公司 | 一种多节锂电池组电压采样电路 |
TW202338765A (zh) * | 2022-03-30 | 2023-10-01 | 聯詠科技股份有限公司 | 伽瑪電壓產生器、源極驅動器和顯示裝置 |
CN114610105A (zh) * | 2022-04-21 | 2022-06-10 | 绵阳惠科光电科技有限公司 | 基准电压电路、伽马电压电路和显示装置 |
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US20150130852A1 (en) | 2015-05-14 |
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