TWI278688B - Source driving integrated circuit of liquid crystal display module and source driving system using the same - Google Patents

Abstract

The present invention relates to a source driving IC and a source driving system using the same for a LCD module. The source driving system includes a first source driving IC, a n-th source driving IC, and a second source driving IC. The self Gamma Correction Voltage is input and buffered in the first source driving IC, and the buffered self Gamma Correction Voltage is output to the second source driving IC and to the n-th source driving IC via an external circuitry of the first source driving IC. Another Gamma Correction Voltage is input and buffered in the n-th source driving IC, and the buffered another Gamma Correction Voltage is then output to the first source driving IC and the second source driving IC via the external circuitry of the n-th source driving IC. The buffered self Gamma Correction Voltage and the buffered another Gamma Correction Voltage are input to the second source driving IC via the external circuitry of the second source driving IC. The present invention employs a Gamma buffer corresponding to a specific Gamma Correction Voltage to avoid the driving voltage difference between the source driving ICs, and to improve the displaying quality. Further, the Gamma buffer part containing Gamma buffers is integrated into the source driving IC to minimize the number of LCD components.

Description

1278688 发明, the invention description: [Technical Field] The present invention relates to a liquid crystal display device, and more particularly to an LCD (Liquid Crystal Display, LCD for short) module for improving the quality of the enamel and reducing the number of parts. The source drives the integrated circuit and its source drive system.

[Prior Art] In general, an LCD drives an integrated circuit in an ideographic manner, and converts digital data such as video information processed by an image processor such as a personal computer into a liquid crystal driving signal 'applying a voltage to the liquid crystal'. A display device that does not display image information. FIG. 1 is a block diagram showing a conventional LCD module. The conventional L C D module includes a source drive system 100, a source circuit block 200, a gate drive system 300, a gate circuit block 400, and an LCD panel 500.

The source circuit block 200 includes a timing control unit 2 1 0, a power supply unit 2 2 0, and a gamma correction voltage generation unit 2 30. The timing control unit 2 1 0 converts the video signal transmitted by the VGA (Video Graphic Adapter) to various signals, and transmits the timing control signal to the source drive system 100 and the gate drive system 300. The power supply unit 220 supplies the power supplied from the VGA port to the source drive system 100, the gate drive system 300 and the timing control unit 2 1 0. The gamma correction voltage generating unit 203 generates a gamma correction voltage by the power supply supplied from the power supply unit 220 (Vgma, Gamma Correction 5 1278688).

Voltage ) and supplied to the source drive circuit system 100. The circuit board includes an input control system. 13 The L C D panel 500 is connected to the source line, the gate line and the pixel (not shown). The source driving system 100 includes a plurality of source-driven integrated circuit chips 1 1 0 - 1 to 1 1 0 _ η, and is electrically connected to the source circuit block 200 and the LCD surface 500 to drive The source line of the LCD panel 500. The gate driving system 300 includes a plurality of gate driving integrated circuits 300-1 to 300-m electrically connected to the gate circuit block 400 and the LCD surface 500 to drive the gate lines of the LCD panel 500. As shown in FIG. 2, the source drive integrated circuit chip 1 1 0 -1 is a control unit 1 1 1 , a shift register 1 1 2, a data register 1 1 3, 2 line latch The lock 1 1 4 and a voltage output unit 1 18 are provided. The control unit 1 1 1 is driven by the data start signals EI01 and EI02, the polarity control signal POL, the load signal LOAD, the data lock signal DCLK, and the direction signal Lb/R, and the source drive integrated circuit chip 1 1 0 -1 All. The shift register Π 2 shifts the full bit by one digit for each timing cycle. The data register 1 is an input reverse signal REV1, REV2 and a digital data number D 0 0 to D 5 5. The 2-wire latch 1 1 4 inputs a digital data signal and outputs it. As shown in Fig. 3, the voltage output unit 1 18 includes a gamma buffer 1 17 , an output D/A (digital/analog) converter 1 15 and an output circuit 116. The gamma buffer unit 1 1 7 includes the same gamma buffers 117a, 1 1 7 b, and 1 1 7 c, and buffers the gamma correction 1278688 voltage (Vgma) supplied from the gamma correction voltage generating unit 2300. And output the buffered gamma correction voltage (Vb-gma, Buffering Gamma Correction Voltage) 〇

The output D/A converter 1 1 5 includes a register array 1 1 5 a and a switch array unit 1 1 5 b. The register array 1 1 5 a distributes the voltage to the buffered gamma correction voltage by distributing the impedances r 1 to r 6 3 , and outputs the distributed gamma voltages V 0 V V 6 3 . The switch array unit 1 1 5 b includes a switch array 1 1 5 b -1 〜1 1 5b-n for distributing a gamma voltage switch to convert the digital data signal into an analog data signal. Corresponding to the switch array 1 1 5 b _ 1~1 1 5 b - η - corresponding to one, the output drive circuit 1 16 includes a plurality of output buffers 1 1 6-1~1 1 6-η, input analogy The data signal and the driving voltage OUT 1 ~ Ο U Τ η 〇 are output to the LCD panel 500

As shown in FIG. 4, the external gamma correction voltage generating unit 230 of the source drive system 100 outputs the first and second power supply units 220 with four gamma correction impedances R1, R2, R3, and R4. The input voltages Vin1 and Vin2 are distributed to the first, second, and third gamma correction voltages Vgmal, Vgma2, and Vgma 3, and are output to the source drive integrated circuit wafers 1 1 _ 1 to 1 10-n, respectively. In other words, the first gamma correction voltage Vgmal is input to the first source drive integrated circuit wafer 1 1 0 -1, the second source drive integrated circuit wafer 1 1 0 - 2, ..., and the nth source, respectively. The first gamma buffer 117a of the gamma buffer portion 117 of the integrated circuit wafer 1 1 0 - η is driven, where n is a natural number greater than 2. The second gamma correction voltage Vgma2 is input to the first source drive integrated circuit wafer 1 1 〇 - : 1, the second source drive integrated circuit wafer 1 1 0 - 2, ... and the nth source drive integrated circuit The second gamma buffer 1 17b of the gamma buffer portion 1 1 7 7 1278688 of the wafer 1 1 0-n. The third gamma correction voltage Vgma3 is input to the first source drive integrated circuit wafer 1 1 0 -1, the second source drive integrated circuit wafer 1 1 〇-2, ..., and the η source drive integrated circuit chip, respectively. The third gamma buffer 1 1 7c of the gamma buffer portion 1 1 7 of 1 1 0-n. In the conventional LCD module configured as described above, the gamma correction voltage generating unit 203 is provided in parallel with the source driving system 100. The source driving integrated circuit chip 1 1 0 -1 to 1 1 0 - η gamma Ma correction voltage. At this time, the gamma correction impedance value of the gamma correction voltage generating portion 203 is appropriately adjusted so that the gamma correction voltage is adapted to the inherent characteristics of the LCD panel 500. The gamma correction voltage is supplied to the source drive system 1 〇〇 source drive integrated circuit chip 1 1 0 -1 to 1 1 0 - η gamma buffer portion 1 1 7 , gamma buffer portion 117 output The buffered gamma correction voltages Vb-gmal, Vb-gma2, and Vb-gma3 are input to the register array 1J 115a. When the register array 1 15a is an output D/A converter 1 1 5 of n bits, the 2n distributed gamma voltages are supplied in parallel to the switch with the input buffered gamma correction voltage. Array section Π 5 b. As shown in FIG. 3, the switch arrays 1 1 5 b -1 to 1 1 5b-n of the switch array portion 1 1 5 b are input from the register array 1 1 5 a by the digital data signals respectively input. Among the distributed gamma voltages, one of the assigned gamma voltages, that is, the analog data signal, is transmitted to the output drive circuit Π 6. Output buffer circuit 1 1 6 output buffer 1 1 6 -1~1 1 6 - η respectively selects the assigned gamma voltage, that is, the driving voltage Ο U Τ 1~Ο U Τ η, and outputs it to the LCD panel 5 0 0, drive the source line of the LCD panel 500. As shown in FIG. 4, the gamma buffers 1 1 7 a, 1 1 7 b, and 1 1 7 c 8 1278688 are hidden in the source drive integrated circuit chips Π0-1 to 110-n. The gamma correction impedances R 1 , R2 , R3 , and R4 of the gamma correction voltage generating unit 203 are prevented from being subjected to the register array 1 1 5 a of the source driving integrated circuit chips 110-1 to 110-n. The effect of the impedance is assigned and the gamma correction voltage is changed.

That is, the gamma correction voltage generated by the gamma correction voltage generating unit 203 is not affected by the impedance of the register array 1 15 a, so the output of the gamma correction voltage generating unit 230 is temporarily stored. Between the input terminals of the array 115a, a gamma buffer portion 1 17 including gamma buffers 11 7a, Π 7b, and 1 7 7c is inserted.

As described above, when the gamma buffer portion 1 17 is included in the individual source-driven integrated circuit wafers 1 1 0-1 to 1 1 0-η, the characteristics of the individual gamma buffer portions 1 1 7 Not consistent. That is, the first source drives the integrated circuit chip 1 1 0 -1 gamma buffer 1 1 7 a, the second source drives the integrated circuit chip 1 1 0 - 2 gamma buffer 117a, ... And the characteristics of the gamma buffer 11 7 a of the nth source driving integrated circuit wafer 110-n do not match. Therefore, even the same gamma correction voltage generated by the gamma correction voltage generating unit 203 is input to the gamma buffer U7a of the first source driving integrated circuit wafer 110-1, and the nth source driving integrated circuit. A slight voltage deviation occurs between the individual outputs of the gamma buffer 1 1 7a of the chip 1 10-n and the individual outputs of the gamma buffer Π 7 a. Due to such a deviation, the distributed gamma voltages of the first source-driven integrated circuit wafer 1 1 0 -1 are VO, VI, V2, ..., V63, respectively, and the n-th source-driven integrated circuit wafer 1 1 0 - η The assigned gamma voltage may become VO', VI', V2', ... V63' which are different from V0, VI, V2, ..., V63, respectively. As a result, the deviation of the driving voltage of 9 1278688 between the source driving integrated circuit wafers 110-1 and 110-n also causes poor quality of the LCD. Therefore, in order to solve the problem of poor quality of the above-described source drive system 100 in the LCD, there is another proposal for the source drive system. Fig. 5 is a schematic view showing another conventional LCD module.

For convenience of explanation and avoiding repetition of the description, only the differences between the source drive system of Fig. 5 and the source drive system 100 of Figs. 1 to 4 will be mainly described. The LCD module shown in FIG. 5 is a gamma buffer portion 1 27 and is commonly connected to the source driving integrated circuit chip 1 2 0 - 1 to 1 2 0 - η of the source driving system 120. In the source circuit block 200 outside the source drive system 120, the source drive integrated body disposed in the source drive system 100 is included in the gamma buffer unit 1 1 7 of FIG. 1 . The difference from the circuit chips 110-1 to 110-n is the same as that of the LCD module of Fig. 1.

That is, in the source drive integrated circuit wafer 110-1 shown in Fig. 2, the gamma buffer portion 1 17 is disposed inside the voltage output portion 1 1 8 . However, in the source drive integrated circuit wafer 1 2 0 -1 shown in Fig. 6, the gamma buffer portion 1 2 7 is disposed outside the voltage output portion 1 28 . Similarly, the register array 1 15 5 a of the voltage output unit 11 shown in FIG. 3 is input from the gamma buffer unit 1 1 7 disposed inside the voltage output unit 1 1 8 . Ma correction voltage. However, the register array 1 15 a of the voltage output unit 1 28 shown in FIG. 7 is gamma corrected after input buffering from the gamma buffer unit 1 2 7 disposed outside the voltage output unit 1 2 8 . Voltage. Hereinafter, the source drive system shown in Fig. 8 is compared with the source drive system shown in Fig. 4, 1 1278688, and the different points will be described.

The gamma correction voltages Vgmal, Vgma2, and Vgma3 output from the gamma correction voltage generating unit 2 3 0 of the source driving system 1 2 0 are respectively input to the gamma buffer portion 1 2 7 of the source driving system 1 2 0 The buffer portion 1 2 7 inputs the buffered gamma correction voltages Vb-gmal, Vb-gma2, and Vb-gma3 to the source-accumulation drive circuit chip 1 2 Ο -1 to 1 2 of the source drive system 1 2 0, respectively.暂 _ η of the register array 1 1 5 a. In other words, the gamma correction voltages after the first, second, and third buffers are respectively input to the first source-driven integrated circuit wafer 120-1 and the second source-driven integrated circuit wafer 1 2 0 - 2, ... and the nth source drive integrated circuit chip 1 2 0 - η output D / Α converter 1 1 5 internal register array 1 1 5 a.

In the source driving system 100 shown in FIG. 1 , FIG. 2 , FIG. 3 , and FIG. 4 , a gamma buffer unit 1 17 including a plurality of gamma buffers is respectively included in the source. Driving the integrated circuit chip 1 1 0 -1 to 1 1 0 - η inside, due to the individual characteristics of the gamma buffer, the source drives the integrated circuit chip 1 1 0 -1~1 1 0 - η The output deviation, that is, the drive voltage deviation occurs, causes a problem of poor quality. In order to solve such a problem of poor quality, the source driving system 1 2 0 shown in FIG. 5, FIG. 6, FIG. 7, and FIG. 8 constitutes a gamma containing a complex gamma buffer with other components. The imaginary buffer portion 1 27 is disposed outside the source-driven integrated circuit wafer 1 2 0 -1 to 1 20-η, and the problem of poor quality of the prior art is improved. That is, the gamma voltages assigned to the first source-driven integrated circuit chip 120-1 are VO, VI, V 2, ... V 6 3, which are not affected by the inconsistency in characteristics between the gamma buffers. η source drive integrated circuit wafer 1 2 0 - η distribution gamma 11 1278688 The mA voltage is also VO, VI, V2, ... V63 without voltage deviation, and the individual source drives the integrated circuit chip 1 2 There is no deviation of the driving voltage between 0 -1 and 1 2 0 -η, resulting in poor quality. However, the addition of other parts will increase the stage of the assembly process, increase the defect rate, and increase the cost. SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to use a gamma buffer for a specific gamma correction voltage to avoid a driving voltage deviation between source driving integrated circuit chips to improve enamel quality. Poor question. Another object of the present invention is to incorporate a gamma buffer portion including a plurality of gamma buffers into a source drive integrated circuit chip to reduce the number of parts of the LCD module. In order to achieve the above object, the LCD module source driving integrated circuit of the present invention is located in a source driving integrated circuit chip, and the source driving integrated circuit chip includes a voltage output portion for outputting and driving the LCD panel. The driving voltage of the source line. The voltage output unit includes a gamma buffer, an output D/A converter, and an output drive circuit. The gamma buffer unit buffers the self-gamma correction voltage input from the gamma correction voltage generating unit side, and drives the buffered self-gamma correction voltage output source to the outside of the integrated circuit chip. The output D/A converter converts the digital signal input from the data register into an analog signal by buffering another gamma correction voltage externally input from the source driving circuit chip and the buffered self-correcting voltage. And outputting it, wherein another gamma correction voltage after buffering is 12 1278688 which is another positive voltage outputted from the other side of the gamma correction voltage generating portion. The output drive circuit converts the input signal of the output D/A converter into a drive voltage for driving the source line of the L C D panel, and outputs it. The gamma buffer system includes at least one gamma buffer. The output D/A converter includes at least one register array to close the array. The register array is a gamma correction voltage buffered by the buffered self gamma correction, and the gamma voltage is distributed by distributing the impedance distribution. The switch array unit includes at least one switch array to input the distributed gamma voltage, and the switch is switched to convert the digital data signal into an analog data signal. The output drive circuit includes at least a plurality of output buffers one-to-one with the switch array, and the switch array input analog data is referred to as a drive voltage and output. The source driving integrated circuit driving system using the L CD module of the present invention includes a first source circuit chip having the same internal structure and an nth source driving integrated circuit chip. The first source drive integrated circuit chip includes a gamma slow law output D/A converter and a voltage output unit. The gamma buffer portion is a self gamma correction power buffer input to the gamma correction voltage generating portion, and outputs the buffered self gamma correction voltage to the outside of the first source circuit chip. The output D/A converter is a gamma calibration analogy input to the data register by a self-gamma correction voltage after buffering another gamma correction power input from the external input of the first source body circuit chip. And the voltage and pressure, the output, the source drive product, which is converted by the corresponding number, the drive product, and the slow data.

13 1278688 The signal is converted into an analog data signal and outputted, wherein the buffered another gamma correction voltage is another gamma correction voltage outputted from the other side of the gamma correction voltage generating portion. The voltage output unit includes an output driving circuit for converting an analog data signal of the output D/A converter input into a driving voltage for driving the source line of the LCD panel, and outputting the same.

The nth source driving integrated circuit chip includes a gamma buffer portion, an output D/A converter, and a voltage output portion. The gamma buffer unit buffers another gamma correction voltage outputted from the other side of the gamma correction voltage generating unit, and outputs the buffered another gamma correction voltage to the first source driving integrated circuit chip. The output D/A converter is a buffered self-gamma correction voltage input to the first source-driven integrated circuit chip, and another buffered gamma outputted to the outside of the n-th source driving integrated circuit chip. The voltage is corrected, and the digital data signal input from the data register is converted into an analog data signal and output. The voltage output unit includes an output driving circuit for converting an analog data signal input from the output D/A converter into a driving voltage for driving the source line of the LCD panel, and outputting the same.

The gamma buffer portion of the first source-driven integrated circuit chip includes at least one gamma buffer, and the gamma buffer outputs the buffered self-gamma correction voltage. The gamma buffer portion of the nth source driving integrated circuit chip includes at least one gamma buffer, and the gamma buffer outputs another gamma correction voltage after buffering. In addition, the source driving system using the source driving integrated circuit of the LCD module of the present invention includes one of the same internal structures, the first source 14 1278688, the driving integrated circuit chip, and the second source driving integrated body. The circuit chip and an nth source drive integrated circuit chip. The first source driving integrated circuit chip includes a gamma buffer portion, an output D/A converter, and an output driving circuit. The gamma buffer unit buffers the self-gamma correction voltage input from the gamma correction voltage generating unit side, and outputs the buffered self gamma correction voltage to the outside of the first source driving integrated circuit chip. The output D/A converter is a digital gamma correction voltage that is buffered by the external input of the first source driving integrated circuit, and the self-gamma correction voltage after the buffer is used to input the digital data into the data register. The signal is converted into an analog data signal and outputted, wherein the buffered another gamma correction voltage is another gamma correction voltage outputted from the other side of the gamma correction voltage generating portion. The output drive circuit converts the analog data signal of the output D/A converter input into a drive voltage for driving the source line of the LCD panel, and outputs it. The nth source driving integrated circuit chip includes a gamma buffer portion, an output D/A converter, and a voltage output portion. The gamma buffer unit buffers another gamma correction voltage outputted from the other side of the gamma correction voltage generation unit, and outputs the buffered another gamma correction voltage to the first and second source drive integrated circuits. Wafer. The output D/A converter is a buffered self gamma correction voltage input to the first source driving integrated circuit chip, and another buffered gamma outputted to the outside of the nth source driving integrated circuit chip. The voltage is corrected, and the digital data signal input from the data register is converted into an analog data signal and output. The voltage output unit includes an output driving circuit for converting the analog data signal of the output D/A converter input into a driving voltage of the source line of the driving LCD panel and outputting the driving voltage.

The second source drive integrated circuit chip includes an output D/A converter and a voltage output unit. The output D/A converter is a buffered self-gamma correction voltage input to the first source-driven integrated circuit chip, and another gamma correction voltage after buffering of the n-th source-driven integrated circuit chip. Converting the digital data signal input from the data register into an analog data signal and outputting it. The voltage output unit includes an output driving circuit for converting an analog data signal of the output D/A converter input into a driving voltage for driving the source line of the LCD panel, and outputting the same. In the second source-driven integrated circuit wafer of the present invention, at least one of the second source-driven integrated circuit wafers is included. [Embodiment] Hereinafter, a source driving integrated circuit of an LCD module of the present invention and a source driving system thereof will be described in detail with reference to the accompanying drawings.

As shown in FIG. 9, an LCD module according to a preferred embodiment of the present invention includes a source driving system 130, a source circuit block 200, a gate driving system 300, and a The gate circuit block 400 and an LCD panel 500. The source circuit block 200 includes a timing control unit 2 1 0, a power supply unit 2 2 0, and a gamma correction voltage generation unit 2 30. The timing control unit 2 1 0 converts the video signal transmitted from the VGA port into various signals, and transmits the timing control signal to the source drive system 130 and the gate drive system 300. The power supply unit 220 supplies the power supplied from the VGA port to the source drive system 16 1278 688, the gate drive system 3 Ο 0, and the timing control unit 2 1 0. The gamma correction voltage generating unit 203 generates a gamma correction voltage from the power supply supplied from the power supply unit 220, and supplies it to the source drive system 130. The L C D panel 500 is displayed on the source line, the gate line, and the pixel (not shown).

The source driving system 130 includes a plurality of source driving integrated circuit chips 1 3 Ο -1 〜 1 3 Ο - η having the same internal structure, and is electrically connected to the source circuit block 200 and the LCD panel 500. To drive the source line of the LCD panel 500. The gate driving system 300 includes a plurality of gate driving integrated circuit chips 300-1 300-m, electrically connected to the gate circuit block 400 and the LCD panel 500 to drive the gate of the LCD panel 500 line.

As shown in FIG. 2, the source driving system 130 includes one of the first internal driving integrated circuit wafers 1 3 0 -1 and an nth source driving integrated circuit wafer 1 3 0 having the same internal structure. - η. Alternatively, the source driving system 130 may also include a first source driving integrated circuit wafer 1 3 0 -1 having a same internal structure, a second source driving integrated circuit wafer 1 3 0 - 2 and a The nth source drives the integrated circuit wafer 1 30-n. The first source driving integrated circuit chip 1 3 0 -1 sets the gamma correction voltage, that is, the self gamma correction voltages Vgma2, Vgma3, and the self gamma correction voltages Vgma2, Vgma3 in the other gamma correction voltage Vgmal. Input, buffer, and output buffered self-gamma correction voltages V b - gma 2, V b - gma 3, which are input via an external circuit of the first source-driven integrated circuit chip 1 3 0 -1 At the same time, it is transmitted to the second source drive integrated circuit chip 1 30-2 to the nth source drive integrated circuit wafer 1 30-n. 17 1278688 In addition, the nth source driving integrated circuit chip 13 3 On inputs another gamma correction voltage V gma 1 and outputs another buffered gamma correction voltage Vb-gmal, which is driven via the nth source. The external circuit of the integrated circuit chip is input and transmitted to the first source drive integrated circuit chip 130-1 to the second source drive integrated circuit chip 130-2. The second source-driven integrated circuit wafer 1 3 0 - 2 is the input 苐 1 source-driven integrated circuit 1 3 0 -1 output buffered self-gamma correction voltages Vb-gma2, Vb-gma3, and η The source drives the integrated gamma circuit chip 130-n output buffered another gamma voltage V b - gma 1. The source drive system 130 includes at least one source drive integrated circuit wafer having the same internal structure and operation as the second source drive integrated circuit wafer 1 3 0 - 2 . As shown in FIG. 10, the source driving integrated circuit chip 1 3 0 -1 includes a control unit 111, a shift register 1 1 2, a data register 1 1 3, and a 2-wire latch. The lock 1 1 4 and a voltage output unit 1 3 8 are provided. The control unit 1 1 1 controls the source drive integrated circuit chip 130-1 by the input data start signals EI01 and EI02, the polarity control signal POL, the download signal LOAD, the data lock signal DCLK, and the direction signal Lb/R. The shift register 11 2 shifts all bits by one bit for each timing cycle. The data register 113 inputs the reverse signals REV1, REV2 and the digital data signals D00 to D55. 2-wire latch 1 1 4 Enter the digital data signal and output it. 18 1278688 The voltage output unit 1 3 8 inputs the self-gamma correction voltage of the gamma correction voltage generation unit 2 3 0, and outputs the buffered self-gamma correction voltage, and drives the integrated circuit wafer 1 via the first source. The external circuit input/output D/A converter 1 1 5 of Ο-1 is simultaneously transmitted to the second source drive integrated circuit chip 130-2 to the nth source drive integrated circuit wafer 130-n. Further, the voltage output unit 138 receives another gamma correction voltage buffered by the n-th source drive integrated circuit wafer 1 3 0-n. Therefore, the voltage output unit 138 inputs the buffered self gamma correction voltage, and the buffered another gamma correction voltage and the digital data signal to output the driving voltages OUT1 to OUTn to drive the LCD panel in FIG. Source line of 500 (not shown). As shown in Fig. 11, the voltage output unit 138 includes a gamma buffer unit 137', an output D/A converter 115, and an output drive circuit 116. The gamma buffer unit 1 3 7 includes a plurality of gamma buffers 1 1 7a and 117b, and buffers the self-gamma correction voltages Vgma2 and Vgma3 supplied from the gamma correction voltage generating unit 2300, and buffers the self. The gamma correction voltages Vb-gma2 and Vb-gma3 are output to the outside of the first source drive integrated circuit chip 130-1. In the first embodiment, a preferred embodiment of the gamma buffer portion 137 including two gamma buffers 1 1 7a and 1 1 7b is described, but the gamma buffer portion 137 may also be used. A gamma buffer containing a gamma buffer may be included in the gamma buffer included. For convenience of description, the control unit 1 1 1 , the shift register 1 1 2, the data register 1 1 3, and the 2-wire latch 1 1 4 in the FIG. 1 are not shown in FIG. However, it is actually disposed in the first source drive integrated circuit chip 130-1. 19 1278688 The nth source drive integrated circuit chip 1 in FIG. 2 3 On outputs another buffered gamma correction voltage Vb-gmal to the second, ..., n-1 source The integrated circuit chip is driven.

The output D/A converter 115 includes a register array 115a and a switch array portion 1 15b. The buffer array 1 1 5 a is a buffered gamma self-correcting voltage Vb-gma2, Vb-gma3 input through the external circuit of the first source driving integrated circuit chip 1 3 0 _1, and after buffering The other gamma correction voltage Vb-gmal outputs the distribution gamma voltages V 0 V V 6 3 after the voltages are distributed by the distribution impedances r 1 to r63. The switch array unit 1 1 5 b includes switch arrays 115b-1 to 115b-n for switching the input distributed gamma voltages V0 V V63 to convert the digital data signals of the 2-wire latch 1 1 4 into analogies. Data signal. The preferred embodiment of Figures 1 1 and 2 is illustrated with 63 distribution impedances, but the number of distribution impedances may be increased or decreased.

Corresponding to the switch array 1 1 5b-1~1 1 5b-n - the corresponding one, the output drive circuit 1 16 includes a plurality of buffers 1 1 6-1~1 1 6-n, and the switch array 115b- The analog data signals of the l~115b-n input are converted into driving voltages OUT1 to OUTn, and are output to the source line of the LCD panel 500. Hereinafter, referring to the preferred embodiment of FIG. 2, the connection relationship of the source driving system 130 will be described, and the first source driving integrated circuit wafer 1 3 0 -1 and the nth source driving integrated circuit chip will be described. The connection relationship between 1 3 0 - η is taken as an example. For convenience of explanation, the control unit 1 of FIG. 10 is not shown in FIG. 12, and the shift register 1 1 2, the data register 1 1 3 and the 2 line latch 1 1 4 ' are actually They are respectively disposed in the first, second, ..., η source drive integrated circuit 20 1278688 wafers 130-1 to 130·n. The gamma correction voltage generating unit 2 3 0 of the source driving system 1 390 distributes the first and second input voltages Vin1 and Vin2 transmitted from the power supply unit 220 via the gamma correction impedances R 1 , R2 , R3 , and R4 . After the voltage, the first, second, and third gamma correction voltages Vgmal, Vgma2, and Vgma3 are output. This preferred embodiment is illustrated with four gamma correction impedances, but the number of gamma correction impedances can also be increased or decreased. At this time, the first and second gamma correction voltages V g m a 1 , V g m a 2 , V g m a 3 are input to the source drive integrated circuit wafers 1 3 0 -1 to 13 0-n, respectively. That is, the first gamma correction voltage Vgmal is input to the first gamma buffer 1 1 7a of the gamma buffer portion 1 3 7 of the n-th source-drive integrated circuit wafer 1 3 0 -n, and the second gamma correction The voltage Vgma2 is input to the first gamma buffer 1 1 7a of the gamma buffer unit 1 3 7 of the first source drive driving integrated circuit wafer 1 3 0 -1, and the third gamma correction voltage Vgma3 is input to the first source. The second gamma buffer 1 1 7b of the gamma buffer portion 1 3 7 of the integrated circuit chip 1 3 0 -1 is driven. The first gamma correction voltage V gma 1 described above is another gamma correction voltage, and the second and third gamma correction voltages Vgma2 and Vgma3 are self gamma correction voltages. The first gamma correction voltage Vgmal of the n-th source driving integrated circuit chip 1 3 0-n buffers the first gamma correction voltage Vgmal, and drives the integrated circuit wafer 1 3 0-η via the nth source. The external circuit outputs the gamma correction voltage Vb-gmal after the first buffer to the register array 1 1 5 a of the first source drive integrated circuit chip 1 3 0 -1, and the nth source drive The register array 1 1 5 a of the integrated circuit chip 1 3 0 - η. In addition, the gamma correction 21 1278688 positive voltage Vb-gmal after the first buffer is output to the second source driving integrated circuit crystal > the register array 1 1 5 a, and the 3rd to n-1th sources A register array of pole drive integrated sheets. The first gamma correction circuit Vgma2 of the first source-drive integrated circuit wafer 1 3 0 -1 buffers the second gamma correction voltage Vgma2 and drives the external circuit of the integrated circuit chip 1 3 0 -1 via the pole. The second slow gamma correction voltage V b - gma 2 is output to the register array 1 1 5 a of the first source driving integrated body sheet 1 3 0 -1, and the nth source driving integrated body sheet 1 3 0 -n register array 1 1 5 a. Further, the positive voltage Vb-gma2 after the second buffer is output to the register array 1 1 5 a of the second source drive integrated circuit crystal > and the third to n-1th source drive integrated sheets The array of scratchpads. Next, the first buffer 1 1 7a of the first source-driven integrated circuit wafer 1 3 0 -1 buffers the third gamma correction voltage Vgma3 to the outside of the first source-driven integrated circuit wafer 1 3 0 -1 The circuit 'outputs the washed gamma correction voltage Vb-gma3 to the register array 1 1 5 a of the first source driver circuit chip 1 3 0 -1, and the nth source driver circuit chip 1 3 Ο - η's register array | J 1 1 5 a. Further, the third slow gamma correction voltage V b - gma 3 is output to the register array 115a of the second source drive integrated product sheet 130-2, and the third to n-1th source body circuit wafers are temporarily suspended. Array of registers. The second source-drive integrated circuit wafer 1 3 0 - 2 is temporarily stored in the first buffer 1 1 7 a from the first source-driven integrated circuit wafer 1 3 0 -1 After the gamma correction voltage V b- | 130-2 circuit crystal buffer after the first source of the circuit crystal circuit gamma ί 130-2 circuit crystal 2 gamma, via the third easing complex After the rushed circuit crystal driver array 1 仂 g gma2, 22 1278688 gamma correction after the third buffer is input from the second gamma buffer 117b of the first source driving integrated circuit chip 1 3 Ο -1 The voltage Vb-gma3 inputs the first buffered gamma correction voltage V b - gma 1 from the first gamma buffer 1 17a of the n-th source driving integrated circuit chip 1 30-n. Similarly, the register array of the third to n-th source driving circuit chips (not shown) is the same as the register array 115a of the second source driving integrated circuit chip 130-2. The gamma correction voltages Vb-gmal, Vb.gma2, and Vb_gma3 after the first, second, and third buffers. The gamma correction voltage V b - gma 1 ' after the first buffer is another gamma correction voltage after buffering, and the gamma correction voltages Vb_gma2 and Vb-gma3 after the second and third buffers are buffered self gamma Correct the voltage. Accordingly, the first to nth source-driven integrated circuit wafers 1 3 0 -1 to 1 3 0 - η are stored in the register array π 5 a by the first, second, and third buffered gamma. The correction voltages Vb-gmal, Vb-gma2, and Vb-gma3 are supplied to the switch array unit 1 1 5b in parallel with the distributed gamma voltage. When the output D/A converter 115 is an n-bit output d/Α converter, 2n of the distributed gamma voltages are supplied in parallel to the switch array unit 1 1 5 b. At this time, the distributed gamma voltages V0 to V63 outputted from the first source-driven integrated circuit wafer 1 3 0-1 and the distributed gamma voltage V 0 outputted from the n-th source-driven integrated circuit wafer 13〇-11 are output. ~V 6 3 is the same. Further, the distribution gamma voltages outputted from the second to nth -1st source driving integrated circuit chips are also the same. The switch arrays 115b-1 to 115b-n of the switch array portion 115b are selected from the gamma voltages V0 to V63 input from the register array 1 1 5 a according to the digital data signals input from the 2-wire latch 1 1 4 A distribution voltage, that is, a 23 1278688 analog data signal, is output to the output buffers 116-1 to 116-n of the output drive circuit 1 16 , respectively. Next, the output buffers 116-1 to 116-n output the driving voltages OUT1 to 0 U Τ η for distributing the gamma voltage to the LCD panel 500, and drive the source lines of the L C D panel 500. On the other hand, in an example of the conventional source driving system shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 4, when the gamma buffer portion is built in an individual source-driven integrated circuit chip, a gamma correction voltage, using a plurality of sources to drive each individual gamma buffer in the integrated circuit chip, since the individual characteristics of the gamma buffer are inconsistent, even if the same gamma is input from the gamma correction voltage generating portion The correction voltage, a slight voltage deviation between the individual output terminals of the gamma buffer, due to the deviation of the driving voltage generated between the individual source driving integrated circuit chips, thus causing serious problem of poor quality. . The source driving system of the present invention utilizes a specific gamma buffer for a specific gamma correction voltage to avoid a driving voltage deviation between the source driving integrated circuit wafers to improve the problem of poor quality. The above-described source drive system of the conventional source drive system is proposed in the fifth, sixth, seventh, and ninth embodiments of the conventional source drive system proposed to solve the problem of poor quality of the drive voltage. In another example, a gamma buffer portion including a plurality of gamma buffers is formed by another component, which is respectively included outside the plurality of source-driven integrated circuit chips, and although the problem of poor quality is improved, additional parts are used. At the time, there will be problems such as an increase in the number of stages of the assembly process, an increase in the defective rate, and an increase in cost. In the source driving system of the present invention, the gamma buffer portion 24 1278688 including a plurality of gamma buffers is built in the source driving integrated circuit chip, and the number of parts of the L C D panel is reduced. Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and various modifications and changes can be made without departing from the spirit and scope of the invention. As described above, the present invention utilizes a gamma buffer to correspond to a specific gamma correction voltage to avoid a drive voltage deviation between the source drive integrated circuit wafers to improve the problem of poor quality. In addition, a gamma buffer portion including a plurality of gamma buffers is built in the source driver integrated circuit chip to reduce the number of parts of the LCD module. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a conventional LCD module; FIG. 2 is a schematic diagram of the source driving circuit of the LCD module shown in FIG. 1 , FIG. 2 is a detailed circuit diagram of the voltage output portion of the source-driven integrated circuit chip shown in FIG. 2; FIG. 4 is a detailed circuit diagram of the connection relationship between the gamma correction voltage generating portion and a source driving system of FIG. 1; A schematic diagram of another conventional LCD module is illustrated; FIG. 6 is a schematic diagram of the source driving integrated circuit of the LCD module shown in FIG. 5, and FIG. 7 is a source driving integrated body shown in FIG. Detailed circuit diagram of the voltage output portion of the circuit chip; 25 1278688 Fig. 8 is a detailed circuit diagram of the connection relationship between the gamma correction voltage generating portion and the other source driving system of Fig. 5; Fig. 9 is the source driving system of the present invention An LCD module of a preferred application embodiment; FIG. 10 is a detailed circuit diagram of a source driving integrated circuit chip in a preferred embodiment of the present invention;

Fig. 1 is a detailed circuit diagram of a voltage output portion of the source drive integrated circuit wafer shown in Fig. 10; and a gamma correction voltage generating portion shown in Fig. 12 and Fig. 9 is compared with the present invention. Schematic diagram of the connection relationship of the source drive system of the preferred embodiment. [Main component symbol description] 1 0 0 source drive system Π 0 · 1~1 1 0 - η source drive integrated circuit chip 1 1 1 control unit 1 1 2 shift register Π 3 data register 1 1 4 2-wire latch

115 output D/A converter 116 output drive circuit 1 1 7 gamma buffer unit 1 1 8 voltage output unit 2 0 source circuit block 2 1 0 timing control unit 2 2 power supply unit 2 3 0 gamma correction voltage generation Part 3 0 gate drive system 3 00- 1~300-m gate drive integrated circuit chip 4 0 0 gate circuit block 26 1278688 5 00 LCD panel 1 2 0 source drive system 120-1~120-n Source drive integrated circuit chip 1 2 7 gamma buffer 1 2 8 voltage output 1 3 0 source drive circuit

1 3 0 -1 to 1 3 0 - η source drive integrated circuit chip 1 3 7 gamma buffer unit 1 3 8 voltage output unit 115 output D/A converter 1 1 5 a register array 11 5 b switch Array unit 1 16 output drive circuit

27

Claims (1)

1278688 Pickup, patent application scope: 1. A source driving integrated circuit of an LCD (Liquid Crystal Display) module, which is located in a source driving integrated circuit chip, the source driving integrated circuit chip contains at least one voltage The output unit outputs a driving voltage for driving the source line of the LCD panel, wherein the voltage output unit includes at least: a gamma buffer portion for slowing the self-gamma correction voltage input from the gamma correction voltage generating unit side And outputting the buffered self-gamma correction voltage to the outside of the source driving integrated circuit chip; an output D/A (digital/analog ratio) converter driving the external input of the integrated circuit chip by the source The buffered another gamma correction voltage, and the buffered self-gamma correction voltage, converts the digital data signal input from the data register into an analog data signal, wherein the buffered another gamma correction voltage, Is another gamma correction voltage outputted from the other side of the gamma correction voltage generating portion; and an output driving circuit for inputting the output D/A converter or the like The specific data signal is converted into a driving voltage for driving the source line of the L C D panel, and is output. 2. The source drive integrated circuit of the L C D module of claim 1, wherein the gamma buffer comprises at least one gamma buffer. 3. The source drive 28 1278688 integrated circuit of the LCD module according to claim 1, wherein the output D/A converter comprises at least: a register array, and the buffered self-gamma a Ma calibration voltage, and another buffered gamma correction voltage, by distributing an impedance distribution voltage, outputting a distribution gamma voltage; and a switch array portion including at least one switch array for inputting the distributed gamma voltage And switching the switch to convert the digital data signal into the analog data signal. 4. The source driving integrated circuit of the LCD module according to claim 3, wherein the output driving circuit comprises at least a plurality of output buffers corresponding to one-to-one corresponding to the switch array, the switch The analog data signal of the array input is converted into the driving voltage and output. The source driving system of the source driving integrated circuit of the LCD module comprises at least one of the first source driving integrated circuit chip having the same internal structure, and a second source driving integrated circuit chip. The first source-driven integrated circuit chip includes at least: a gamma buffer portion that buffers a self-gamma correction voltage input from a side of the gamma correction voltage generating unit, and outputs a buffered self-gamma correction voltage The first source drives the outside of the integrated circuit chip; and an output D/A converter drives the other gamma correction voltage input from the external input of the integrated circuit chip by the first source, and after the buffering The self-gamma correction voltage converts the digital data signal input from the data register into an analog data signal, and outputs the same, and the 29 1278688-gamma buffer portion outputs the other side of the gamma correction voltage generating unit. The other gamma correction voltage is buffered, and the buffered another gamma correction voltage is output to the first and second source driving integrated circuit chips; an output D/A converter is driven by the input The self-gamma correction voltage after buffering of the first source-driven integrated circuit chip and another gamma correction voltage after buffering output to the outside of the n-th source driving integrated circuit chip, the data register The input digital data signal is converted into an analog data signal and outputted; and a voltage output portion includes an output driving circuit for converting the analog data signal of the output D/A converter input to drive the LCD panel source a driving voltage of the line and outputting the same; and the second source driving integrated circuit chip includes at least: an output D/A converter, which is a self-buffered self by driving the first source to drive the integrated circuit chip a gamma correction voltage, and another gamma correction voltage buffered by the η source driving integrated circuit chip, converting the digital data signal input from the data buffer into an analog data signal, and outputting the same; The voltage output unit includes an output driving circuit, and converts the analog data signal input from the output D/A converter into a driving voltage for driving the source line of the LCD panel, and Output. 9. The source drive system of the source drive integrated circuit of the L C D module according to claim 8, wherein the second source drive integrated circuit 32 1278688 source drives the integrated circuit chip. The wafer, which contains at least one of the second 33