CN100530340C - Lcd - Google Patents

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Publication number
CN100530340C
CN100530340C CNB200710162325XA CN200710162325A CN100530340C CN 100530340 C CN100530340 C CN 100530340C CN B200710162325X A CNB200710162325X A CN B200710162325XA CN 200710162325 A CN200710162325 A CN 200710162325A CN 100530340 C CN100530340 C CN 100530340C
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voltage
image data
digital analog
change
lcd
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CN101140746A (en
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杨智翔
钟竣帆
许胜凯
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AU Optronics Corp
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AU Optronics Corp
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Abstract

An LCD is provided, which comprises a time schedule controller, a reference voltage generator, a plurality of bleeder circuits, a plurality of conversion circuits and an LCD panel. The time schedule controller is used for producing image data and the reference voltage generator is for generating a group of reference voltage sets which will be transformed into step voltage sets by each bleeder circuit. The conversion circuit then converts the image data to a plurality of data signal voltage according to the step voltage sets obtained from the conversion by each bleeder circuit. The LCD panel includes a plurality of pixel units, each of which contains a transistor and a liquid crystal capacitance used for controlling the arraying direction of the liquid crystal molecules in the corresponding liquid crystal capacitance when opening the transistor according to one of the data signal voltages.

Description

LCD
[technical field]
The present invention relates to a kind of LCD, refer to a kind of LCD especially, can be used at exporting different analog data signal voltage, to drive other pixel cell with a kind of digital image data.
[background technology]
Function advanced person's display gradually becomes the valuable feature of consumption electronic product now, and wherein LCD has become the display that various electronic equipments such as mobile phone, PDA(Personal Digital Assistant), digital camera, computer screen or the widespread use of notebook computer screen institute have the high-res color/graphics gradually.
In existing skill, when the clock signal that produces when the time schedule controller of LCD is sent to gate drivers (gate driver), gate drivers can produce sweep signal and be sent to display panels via sweep trace, at the same time, time schedule controller then can send digital image data to source electrode driver (source driver).See also Fig. 1, Fig. 1 system illustrates traditional GTG-voltage (L-V) curve.When receiving digital image data, source electrode driver can be according to its interior digital analog converter of one group of character used in proper names and in rendering some foreign names agate (Gamma) driven, digital image data is converted to analog data signal voltage.As shown in Figure 1, the transverse axis coordinate is represented the digital image data value, and the coordinate in longitudinal axis left side is represented character used in proper names and in rendering some foreign names agate voltage, and the coordinate on longitudinal axis right side is represented GTG (gray level).After receiving digital image data, digital analog converter can convert digital image data to the corresponding simulating voltage data signal according to GTG-voltage (L-V) curve, and analog data signal voltage corresponds to different GTGs in fact.At last, the pixel cell of display panels is when receiving sweep signal, and the liquid crystal molecule of the analog data signal driven that will send out via data line according to source electrode driver in it is to demonstrate corresponding GTG.Yet in order to promote display quality, display panels can need source electrode driver at driving other pixel cell with the different analog data signal voltage of a kind of digital image data output, to increase the elasticity of colour correction.
[summary of the invention]
In view of this, purpose of the present invention is that a kind of LCD is provided, and makes that LCD can be at driving other pixel cell with the different analog data signal voltage of a kind of digital image data output.
The invention provides a kind of LCD, it comprises time schedule controller, a reference voltage generator, a plurality of bleeder circuit, a plurality of change-over circuit and a display panels.Time schedule controller is to be used for producing image data.This reference voltage generator is to be used for producing one group of set of reference voltages.Each bleeder circuit is used for converting this group set of reference voltages to a rank voltage group.A plurality of change-over circuits are to be used for converting this image data to a plurality of voltage data signals according to rank, the position voltage group of each bleeder circuit conversion.Display panels comprises a plurality of pixel cells, each pixel cell comprises a transistor and a liquid crystal capacitance, this liquid crystal capacitance is used for controlling the orientation of liquid crystal molecule according to the Shu voltage data signal of these a plurality of voltage data signals when this transistor is opened.
The present invention provides a kind of LCD in addition, and it comprises time schedule controller, a plurality of reference voltage generator, a bleeder circuit, a plurality of change-over circuit and a display panels.Time schedule controller is to be used for producing image data.A plurality of reference voltage generators are to be used for producing a plurality of set of reference voltages.Bleeder circuit is to be used for converting these a plurality of set of reference voltages to a plurality of rank voltage groups.A plurality of change-over circuits are used for converting this image data to a plurality of voltage data signals according to these a plurality of rank voltage groups.Display panels comprises a plurality of pixel cells, each pixel cell comprises a transistor and a liquid crystal capacitance, this liquid crystal capacitance is used for controlling the orientation of liquid crystal molecule according to the Shu voltage data signal of these a plurality of voltage data signals when this transistor is opened.
The present invention provides a kind of LCD in addition, and it comprises time schedule controller, a storer, a control module, a plurality of change-over circuit and a display panels.Time schedule controller is to be used for producing image data.Storer is to be used for storing a plurality of changing voltage question blanks, and each changing voltage question blank is corresponding to the transformational relation of image data with the skew image data.Control module is to be used for converting this image data to a plurality of skew image datas according to these a plurality of changing voltage question blanks.A plurality of change-over circuits are used for according to this group set of reference voltages, should convert a plurality of voltage data signals to by a plurality of skew image datas.Display panels comprises a plurality of pixel cells, each pixel cell comprises a transistor and a liquid crystal capacitance, this liquid crystal capacitance is used for controlling the orientation of liquid crystal molecule according to the Shu voltage data signal of these a plurality of voltage data signals when this transistor is opened.
For foregoing of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
[description of drawings]
Fig. 1 illustrates traditional GTG-voltage curve.
Fig. 2 is the functional block diagram of LCD first embodiment of the present invention.
Fig. 3 is the functional block diagram of the source electrode driver of Fig. 2.
Fig. 4 illustrates GTG-voltage curve of the present invention.
Fig. 5 is the functional block diagram of LCD second embodiment of the present invention.
Fig. 6 A is the functional block diagram of source electrode driver first embodiment shown in Figure 5.
Fig. 6 B is the functional block diagram of source electrode driver second embodiment shown in Figure 5.
Fig. 7 is the functional block diagram of LCD the 3rd embodiment of the present invention.
Fig. 8 is the functional block diagram of source electrode driver shown in Figure 7.
[embodiment]
See also Fig. 2, Fig. 2 is the functional block diagram of LCD first embodiment of the present invention.LCD 10 comprises time schedule controller 14, multiple source driver 16, a plurality of gate drivers 18, character used in proper names and in rendering some foreign names agate (gamma) reference voltage generator 22 and display panels 20.Display panels 20 comprises a plurality of pixel cells 28.When the clock signal that produces when time schedule controller 14 is sent to a plurality of gate drivers 18, a plurality of gate drivers 18 can produce sweep signal and be sent to display panels 20 via sweep trace 26, at the same time, 14 of time schedule controllers can send clock signal to source electrode driver 16, and source electrode driver 16 will receive the digital image data that time schedule controller 14 is transmitted according to clock signal.At last, when the pixel cell 28 of display panels 20 is received in sweep signal, will press V according to data voltage and common-battery that source electrode driver 16 is sent out via data line 24 COMWith show image.
See also Fig. 3, Fig. 3 is the functional block diagram of source electrode driver 16 shown in Figure 2.Source electrode driver 16 comprises buffer amplifier 161, change-over circuit 162, level shifter (Level Shifter) 163, data bolt lock device (Latch) 164, data working storage 165, shift registor 166 and a plurality of multiplexer 167.Time schedule controller 14 via bus-bar input digit image data D00P/N ~ D02P/N, D10P/N ~ D102P/N, D20P/N ~ D22P/N to data working storage 165.Clock signal CLKP/N is feed-in shift registor 166 and data working storage 165 respectively.Open beginning signal DIO1 and input to shift registor 166 and start source electrode drivers 16 readout data signals, open beginning signal DIO2 and export next stage source electrode driver 16 to, open beginning setting signal SHL and can set that to open beginning signal DIO1, DIO2 be input pin position or output pin position.Control signal STB is feed-in data bolt lock device 164 and buffering amplifier 161 respectively, and when control signal STB was the rising edge, digital image data was by data working storage 165 feed-in data bolt lock devices 164; When control signal STB is the drop edge, image data voltage by buffer amplifier 161 via passage Y 1... Yn drives the pixel cell 28 of display panels 20.
Change-over circuit 162 comprises a plurality of bleeder circuits 1622 and a plurality of digital analog converter 1624.For convenience of description, only show two bleeder circuit 1622a, 1622b among Fig. 3; In other embodiments, the number of bleeder circuit can optionally be adjusted to two or more.Each bleeder circuit 1622a, 1622b system is formed by the resistance of a plurality of serial connections.Yet must pay special attention to, the dividing potential drop that the first bleeder circuit 1622a and the second bleeder circuit 1622b are exported is inequality; In other words, though the input of the first bleeder circuit 1622a and the second bleeder circuit 1622b is all the Shu group set of reference voltages V of character used in proper names and in rendering some foreign names agate reference voltage generator 22 outputs A1-V A18, but can export first different rank voltage group V respectively GMA1-V GMA18And second rank voltage group V GMB1-V GMB18
Please Shu and consult Fig. 3 and Fig. 4, Fig. 4 system illustrates GTG-voltage of the present invention (L-V) curve, and wherein the transverse axis coordinate is represented the digital image data value, and the coordinate in longitudinal axis left side is represented first rank voltage group V GMA1-V GMA18And second rank voltage group V GMB1-V GMB18, the coordinate on longitudinal axis right side is represented GTG (gray level), AVDD represents power supply aanalogvoltage required on the source electrode driver.Be electrically connected at first rank voltage group V GMA1-V GMA18Digital analog converter 1624 (that is first polarity digital analog converter) after receiving digital image data, can convert digital image data to the corresponding simulating voltage data signal according to GTG-voltage curve 51.Relatively, be electrically connected at second rank voltage group V GMB1-V GMB18Digital analog converter 1624 (that is second polarity digital analog converter) after receiving digital image data, can convert digital image data to the corresponding simulating voltage data signal according to GTG-voltage curve 52.Can notice from Fig. 4, can export different analog data signal voltage because corresponding to different GTG- voltage curve 51,52 respectively with Shu digital image data.After, multiplexer 167 is used for according to a polar signal POL, switches by these first polarity digital analog converters output this a plurality of voltage data signals, or exports these a plurality of voltage data signals by these second polarity digital analog converters.Thus, when the pixel cell of display panels 20 28 receives sweep signals, will be according to the analog data signal voltage of digital analog converter 1624 outputs of source electrode driver 16, via passage (channel) Y 1-Y nThe pixel cell that drives those passages of connection is to demonstrate corresponding GTG.
See also Fig. 5, Fig. 5 is the functional block diagram of LCD second embodiment of the present invention.LCD 60 comprises time schedule controller 14, multiple source driver 16, a plurality of gate drivers 18, the first character used in proper names and in rendering some foreign names agate reference voltage generator 42, second character used in proper names and in rendering some foreign names agate reference voltage generator 44 and the display panels 20.Display panels 20 comprises a plurality of pixel cells 28.When the clock signal that produces when time schedule controller 14 is sent to a plurality of gate drivers 18, a plurality of gate drivers 18 can produce sweep signal and be sent to display panels 20 via sweep trace 26, at the same time, 14 of time schedule controllers can send clock signal to source electrode driver 16, and source electrode driver 16 will receive the digital image data that time schedule controller 14 is transmitted according to clock signal.At last, when the pixel cell 28 of display panels 20 is received in sweep signal, will press V according to data voltage and common-battery that source electrode driver 16 is sent out via data line 24 COMWith show image.
See also Fig. 6 A, Fig. 6 A is the functional block diagram of source electrode driver first embodiment shown in Figure 5.Source electrode driver 16 comprises buffer amplifier 161, change-over circuit 162, level shifter (Level Shifter) 163, data bolt lock device (Latch) 164, data working storage 165, shift registor 166 and a plurality of multiplexer 167.For the purpose of simplifying the description, element every with shown in Figure 3 has identical numbering person and has identical functions in Fig. 6, does not repeat them here its running.Change-over circuit 162 comprises a plurality of bleeder circuits 1622 and a plurality of digital analog converter 1624.For convenience of description, only show two bleeder circuit 1622a, 1622b among Fig. 6; In actual other embodiment, the number of bleeder circuit can optionally be adjusted to two or more.Each bleeder circuit 1622a, 1622b system is formed by the resistance of a plurality of serial connections, but must pay special attention to, and the dividing potential drop that the first bleeder circuit 1622a and the second bleeder circuit 1622b are exported is inequality.In addition, the input of the first bleeder circuit 1622a and the second bleeder circuit 1622b is respectively the set of reference voltages V of the first character used in proper names and in rendering some foreign names agate reference voltage generator, 42 outputs A1-V A18And the set of reference voltages V of the second character used in proper names and in rendering some foreign names agate reference voltage generator, 44 outputs B1-V B18, and export first different rank voltage group V respectively GMA1-V GMA18And second rank voltage group V GMB1-V GMB18At last, be electrically connected at first rank voltage group V GMA1-V GMA18 Digital analog converter 1624 after receiving digital image data, can convert digital image data to the corresponding simulating voltage data signal according to GTG-voltage curve 51.Relatively, be electrically connected at second rank voltage group V GMB1-V GMB18 Digital analog converter 1624 after receiving digital image data, can convert digital image data to the corresponding simulating voltage data signal according to GTG-voltage curve 52.Can notice from Fig. 4, can export different analog data signal voltage because corresponding to different GTG- voltage curve 51,52 respectively with Shu digital image data.After, multiplexer 167 is used for according to a polar signal POL, switches by these first polarity digital analog converters output this a plurality of voltage data signals, or exports these a plurality of voltage data signals by these second polarity digital analog converters.Thus, when the pixel cell 28 of display panels 20 is received in sweep signal, will be according to the analog data signal driven of digital analog converter 1624 output of source electrode driver 16 liquid crystal molecule in it to demonstrate corresponding GTG.
See also Fig. 6 B, Fig. 6 B is the functional block diagram of source electrode driver second embodiment shown in Figure 5.Source electrode driver 16 shown in Fig. 6 B only comprises a bleeder circuit 1622.Bleeder circuit 1622 can receive the set of reference voltages V of the first character used in proper names and in rendering some foreign names agate reference voltage generator, 42 outputs A1-V A18And the set of reference voltages V of the second character used in proper names and in rendering some foreign names agate reference voltage generator, 44 outputs B1-V B18, and export first different rank voltage group V respectively GMA1-V GMA18And second rank voltage group V GMB1-V GMB18Except bleeder circuit 1622, other element operation principles of the source electrode driver of Fig. 6 B is identical with the source electrode driver shown in Fig. 6 A, does not give unnecessary details in addition at this.
See also Fig. 7, Fig. 7 is the functional block diagram of LCD the 3rd embodiment of the present invention.LCD 70 comprises time schedule controller 34, multiple source driver 46, a plurality of gate drivers 18, character used in proper names and in rendering some foreign names agate reference voltage generator 22 and display panels 20.Display panels 20 comprises a plurality of pixel cells 28.When the clock signal that produces when time schedule controller 34 is sent to a plurality of gate drivers 18, a plurality of gate drivers 18 can produce sweep signal and be sent to display panels 20 via sweep trace 26, at the same time, 34 of time schedule controllers can send clock signal to source electrode driver 46, and source electrode driver 36 will receive the digital image data that time schedule controller 34 is transmitted according to clock signal.At last, when the pixel cell 28 of display panels 20 was received in sweep signal, the data voltage that will send out via data line 24 according to source electrode driver 46 and the common-battery of common electrode voltage generator 25 outputs were pressed V COMWith show image.
See also Fig. 5, Fig. 7 and Fig. 8, Fig. 8 is the functional block diagram of source electrode driver 46 shown in Figure 7.For the purpose of simplifying the description, element every with shown in Figure 3 has identical numbering person and has identical functions in Fig. 8, does not repeat them here its running.Time schedule controller 34 comprises control module 342 and storer 344.Storer 344 stores a plurality of changing voltage question blanks, and each changing voltage question blank is corresponding to the transformational relation of this image data and a skew image data.Control module 342 is used for converting digital image data to a plurality of skew image datas according to these a plurality of changing voltage question blanks.Change-over circuit 162 comprises a plurality of digital analog converters 1624, is used for the set of reference voltages V that produces according to character used in proper names and in rendering some foreign names agate reference voltage generator 22 GMA1-V GMA18, convert a plurality of skew image datas to a plurality of voltage data signals.For instance, please refer to Fig. 5, and be example with the negative polarity, when digital image data DATA1 is sent to time schedule controller 34, control module 342 converts this digital image data DATA1 to skew image data Shift_DA according to changing voltage question blank Table_A, its data value is 30H, converts this digital image data DATA1 to skew image data Shift_DB according to changing voltage question blank Table_B simultaneously, and its data value is 20H; When digital image data DATA2 is sent to time schedule controller 34, control module 342 converts this digital image data DATA2 to skew image data Shift_DA according to changing voltage question blank Table-_A, its data value is 02H, convert this digital image data DATA1 to skew image data Shift_DB according to changing voltage question blank Table_B simultaneously, its data value is 01H.In other words, digital analog converter 1624 can be according to set of reference voltages V GMA1-V GMA18With the data value of skew image data Shift_DA is the data-switching Cheng Weijie voltage V of 30H, 02H GMA13, V GMA16And by buffer amplifier 161 amplification back output becoming voltage data signals.Similarly, digital analog converter 1624 can be according to set of reference voltages V GMA1-V GMA18With the data value of skew image data Shift_DB is the data-switching Cheng Weijie voltage V of 20H, 01H GMA13, V GMA16And by buffer amplifier 161 amplification back output becoming analog data signal voltages.Therefore, see through above-mentioned mechanism, source electrode driver 46 but can be exported different analog data signal voltage at same digital image data.
The source electrode driver of present embodiment comprises a plurality of multiplexers 167, be used for according to a polar signal POL, switching by these first polarity digital analog converters (in the present embodiment, promptly be connected in the digital analog converter of skew image data Shift_DA) these a plurality of voltage data signals of output, or by these second polarity digital analog converters (promptly being connected in the present embodiment, the digital analog converter of skew image data Shift_DB) these a plurality of voltage data signals of output.Thus, when the pixel cell 28 of display panels 20 is received in sweep signal, will be according to the analog data signal driven of digital analog converter 1624 output of source electrode driver 46 liquid crystal molecule in it to demonstrate corresponding GTG.
Compared to prior art, the source electrode driver of LCD of the present invention utilizes a plurality of bleeder circuits that set of reference voltages is divided into rank, different position voltage group, makes can export different analog data signal voltage according to coordination rank voltage group not with the Shu digital image data.Or utilize the mode of tabling look-up, and this digital image data is output as different skew image datas earlier, convert each skew image data to different analog data signal voltage again.Thus, the source electrode driver of display panels is at just exporting different analog data signal voltage to drive other pixel cell with a kind of digital image data.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.

Claims (13)

1. LCD, it comprises:
Time schedule controller is used for producing an image data;
One reference voltage generator is used for producing one group of set of reference voltages;
A plurality of bleeder circuits, each bleeder circuit are used for converting this group set of reference voltages to a rank voltage group;
A plurality of change-over circuits are used for converting this image data to a plurality of voltage data signals according to rank, the position voltage group of each bleeder circuit conversion; And
One display panels, comprise a plurality of pixel cells, each pixel cell comprises a transistor and a liquid crystal capacitance, this liquid crystal capacitance is used for when this transistor is opened, according to the orientation of liquid crystal molecule in the corresponding pixel cell of the voltage data signal control of these a plurality of voltage data signals;
One multiplexer according to a polar signal, switches and selects a plurality of change-over circuits of same image data correspondence to export.
2. LCD according to claim 1 is characterized in that, these a plurality of change-over circuits comprise a plurality of digital analog converters.
3. LCD according to claim 1 is characterized in that, these a plurality of bleeder circuits and this a plurality of change-over circuit assemblys are formed within the one source pole driver.
4. LCD according to claim 1 is characterized in that each bleeder circuit comprises the resistance of a plurality of mutual polyphones.
5. LCD according to claim 1, it is characterized in that, wherein these a plurality of change-over circuits comprise a plurality of first polarity digital analog converters and a plurality of second polarity digital analog converter, this multiplexer is used for according to this polar signal, selection is exported these a plurality of voltage data signals by these a plurality of first polarity digital analog converters, or by these a plurality of these a plurality of voltage data signals of second polarity digital analog converters output.
6. LCD, it comprises:
Time schedule controller is used for producing an image data;
A plurality of reference voltage generators are used for producing a plurality of set of reference voltages;
One bleeder circuit is used for converting these a plurality of set of reference voltages to a plurality of rank voltage groups;
A plurality of change-over circuits are used for converting this image data to a plurality of voltage data signals according to these a plurality of rank voltage groups; And
One display panels, comprise a plurality of pixel cells, each pixel cell comprises a transistor and a liquid crystal capacitance, this liquid crystal capacitance is used for when this transistor is opened, according to the orientation of liquid crystal molecule in the corresponding pixel cell of the voltage data signal control of these a plurality of voltage data signals;
One multiplexer according to a polar signal, switches and selects a plurality of change-over circuits of same image data correspondence to export.
7. LCD according to claim 6 is characterized in that, these a plurality of change-over circuits comprise a plurality of digital analog converters.
8. LCD according to claim 6 is characterized in that, these a plurality of bleeder circuits and this a plurality of change-over circuit assemblys are formed within the one source pole driver.
9. LCD according to claim 6 is characterized in that a bleeder circuit of these a plurality of bleeder circuits comprises the resistance of a plurality of polyphones.
10. LCD according to claim 6, it is characterized in that, wherein these a plurality of change-over circuits comprise a plurality of first polarity digital analog converters and a plurality of second polarity digital analog converter, this multiplexer is used for according to this polar signal, switching is exported these a plurality of voltage data signals by these a plurality of first polarity digital analog converters, or by these a plurality of these a plurality of voltage data signals of second polarity digital analog converters output.
11. a LCD, it comprises:
One reference voltage generator is used for producing one group of set of reference voltages;
One storer is used for storing a plurality of changing voltage question blanks, and each changing voltage question blank is corresponding to the transformational relation of an image data and a skew image data;
One control module is used for converting this image data to a plurality of skew image datas according to these a plurality of changing voltage question blanks;
A plurality of change-over circuits are used for according to this group set of reference voltages, should convert a plurality of voltage data signals to by a plurality of skew image datas; And
One display panels comprises a plurality of pixel cells, and each pixel cell comprises a transistor and a liquid crystal capacitance, and this liquid crystal capacitance is used for when this transistor is opened, and is right according to these a plurality of voltage data signal controls
The orientation of liquid crystal molecule in the pixel cell of answering;
One multiplexer according to a polar signal, switches and selects a plurality of change-over circuits of same image data correspondence to export.
12. LCD according to claim 11 is characterized in that, it comprises time schedule controller in addition, and wherein this storer and this control module system is integrated among this time schedule controller.
13. LCD according to claim 11, it is characterized in that, wherein these a plurality of change-over circuits comprise a plurality of first polarity digital analog converters and a plurality of second polarity digital analog converter, this multiplexer is used for according to this polar signal, selection is exported these a plurality of voltage data signals by these a plurality of first polarity digital analog converters, or by these a plurality of these a plurality of voltage data signals of second polarity digital analog converters output.
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CN102693705A (en) * 2012-01-18 2012-09-26 矽创电子股份有限公司 Panel driving circuit
KR101998230B1 (en) 2012-05-14 2019-07-09 엘지디스플레이 주식회사 Display Device
TWI745757B (en) * 2018-10-01 2021-11-11 矽創電子股份有限公司 Source driver and composite level shifter

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