TW202242823A - Source drive chip that reduces generation of thermal energy and liquid crystal display using same, and information processing device that includes a polarity switching detection unit, a data voltage change detection unit, and a switching circuit - Google Patents

Abstract

A source drive chip that reduces generation of thermal energy comprises: a polarity switching detection unit, which is operable to detect if the polarities of two displayed data of the same row, among two columns of front side and rear side of displayed data, are opposite, and if yes, making a first detection result exhibit an action state, and if not, making the first detection result exhibit a non-action state, and making a polarity consistence signal exhibit an action state; a data voltage change detection unit, which is operable to determine if a difference of the two displayed data of the same row is greater than a threshold when the polarity consistence signal exhibits the action state, and if yes, making a second detection result exhibit an action state; and a switching circuit, which is operable to perform a charge sharing operation for a TFT liquid crystal array when the first detection result or the second detection result exhibits the action state, so as to have pixel capacitors of two adjacent data channels of the TFT liquid crystal array to proceed with redistribution of charges.

Description

Source driver chip capable of reducing heat generation and liquid crystal display and information processing device using it

The invention relates to a source driver chip, especially a source driver chip capable of reducing heat energy generation.

In order to reduce the heat energy generated during the operation of the liquid crystal display, a conventional charge sharing technical solution is proposed. Please refer to FIG. 1a, which shows a block diagram of a charge sharing control circuit of a conventional liquid crystal display. As shown in Figure 1a, the charge sharing control circuit includes a timing controller 10, a source driver 21 and a TFT liquid crystal array 30, wherein the source driver 21 includes a charge sharing drive unit 21a and a source drive unit 21b .

The timing controller 10 is used to transmit display data to the source driver 21 through a display data signal S _DISP ; the charge sharing driving unit 21a is used to periodically and unconditionally output a charge sharing control signal C _CS to the source driving unit 21b To drive a switch circuit inside the source drive unit 21b, so that each row of pixel capacitors of the TFT liquid crystal array 30 is charged two by two before charging the pixel capacitors of the TFT liquid crystal array 30 with the pixel voltage corresponding to the display data.

Please refer to FIG. 1b, which shows a working timing diagram of the charge sharing control circuit in FIG. 1a. As shown in Fig. 1b, each pixel voltage establishment period includes a charge sharing period T _S and a pixel voltage driving period T _DRV , wherein, the source drive unit 21b, regardless of the output of each output channel every two in time Whether the polarity of the adjacent pixel voltage will be opposite, that is, whether it is (+,-), (+,+), (-,-) or (-,+), during each charge sharing period _{T S} will cause each odd-numbered output channel Y _2n-1 of the plurality of output channels to perform charge sharing with an adjacent even-numbered output channel Y _2n , so that the odd-numbered output channel Y _2n- The voltages of the ₁ and even output channels Y _2n both reach a middle voltage V _DD2M , where the polarity + indicates that the pixel voltage is higher than the middle voltage V _DD2M , and the polarity - means that the pixel voltage is lower than the middle voltage V _DD2M .

However, when the voltages of two temporally adjacent pixels output by each output channel have the same polarity and remain unchanged, the charge sharing control circuit in FIG. 1a will have redundant charging and discharging processes and generate redundant heat.

In addition, please refer to FIG. 2a, which shows a block diagram of a charge sharing control circuit of another conventional liquid crystal display. As shown in Figure 2a, the charge sharing control circuit includes a timing controller 10, a source driver 22 and a TFT liquid crystal array 30, wherein the source driver 22 includes a polarity conversion detection unit 22a and a source driver unit 22b.

The timing controller 10 is used to transmit the display data to the source driver 22 through a display data signal S _DISP ; the polarity change detection unit 22a is used to detect two columns of display data, two display data located in the same row When the polarity of the voltage corresponding to the data is reversed, a charge sharing enable signal C _CS is in an active state, and the source drive unit 22b will drive one of its internal switch circuits when the charge sharing enabling signal C _CS is in an active state, so as to promote the TFT The two corresponding data channels of the liquid crystal array 30 perform charge sharing, so as to save the amount of charge needed to establish the next pixel voltage on the pixel capacitor.

Please refer to FIG. 2b, which shows a working timing diagram of the charge sharing control circuit in FIG. 2a. As shown in Figure 2b, each pixel voltage establishment period includes a charge sharing period T _S and a pixel voltage driving period T _DRV , wherein the source drive unit _22b outputs two When adjacent pixel voltages have opposite polarities (+,-), an odd-numbered output channel Y _2n-1 will be connected to an adjacent even-numbered output channel during a charge sharing period T _S between (+,-) Y _2n performs charge sharing, so that at the end of the charge sharing period _TS , the voltages of the odd output channel Y _2n-1 and the even output channel Y _2n both reach an intermediate voltage V _DD2M ; and the output of the odd output channel Y _2n-1 When two adjacent pixel voltages have the same polarity (+,+), the odd-numbered output channel Y _2n-1 does not perform charge sharing with the adjacent even-numbered output channel Y _2n .

The charge sharing control circuit in Fig. 2a can avoid the redundant charging and discharging process when the voltage polarities of two temporally adjacent pixels output by each output channel are the same and the value remains unchanged. When the voltage polarity of two pixels adjacent in time is the same, but the value changes from large to small or from small to large, there will still be a large amount of charge flowing and heat energy will be released.

In order to solve the above problems, there is an urgent need in the art for a novel source driver chip.

One object of the present invention is to provide a source driver chip capable of reducing thermal energy generation, which can carry out a charge sharing to a TFT liquid crystal array when the polarity of two display data of the same row in the front and rear two columns of display data is opposite. operation, and the charge sharing operation is performed on the TFT liquid crystal array when the polarities of the two display data in the same row are the same but the value difference is greater than a threshold, so as to further reduce the heat energy generated by a liquid crystal display.

Another object of the present invention is to provide a liquid crystal display, which can carry out a charge sharing operation to a TFT liquid crystal array when the polarities of two display data of the same row are opposite in the front and rear two columns of display data, and in said The charge sharing operation is performed on the TFT liquid crystal array when the polarity of two display data in the same row is the same but the value difference is greater than a threshold, thereby further reducing the heat energy generated by the liquid crystal display.

Another object of the present invention is to provide an information processing device which has the aforementioned liquid crystal display and can reduce the heat energy generated by it.

In order to achieve the aforementioned purpose, a source driver chip capable of reducing heat generation is proposed, which has:

A polarity change detection unit, which is used to detect whether there are two display data in the same row with opposite polarities in the front and rear two columns of display data. making the first detection result in an inactive state, and making a signal with the same polarity in an active state;

A data voltage change detection unit, used for judging whether the numerical difference of the two display data in the same row is greater than a threshold value when the signals of the same polarity are in the active state, and if so, making a second detection result present an active state, if not, make the second detection result present an inactive state; and

A switch circuit, used to perform a charge sharing operation on a TFT liquid crystal array when the first detection result or the second detection result is active, so that two adjacent data channels of the TFT liquid crystal array The pixel capacitors perform charge redistribution.

In one embodiment, the polarity change detection unit has a register unit for temporarily storing the display data of at least one column.

In one embodiment, the data voltage change detection unit has a register unit for temporarily storing the display data of at least one row.

In order to achieve the aforementioned purpose, the present invention further proposes a liquid crystal display, which has a source driver chip that can reduce heat generation and a TFT liquid crystal array, and the source driver chip that can reduce heat generation has:

A polarity change detection unit, which is used to detect whether there are two display data in the same row with opposite polarities in the front and rear two columns of display data. making the first detection result in an inactive state, and making a signal with the same polarity in an active state;

A data voltage change detection unit, used for judging whether the numerical difference of the two display data in the same row is greater than a threshold value when the signals of the same polarity are in the active state, and if so, making a second detection result present an active state, if not, make the second detection result present an inactive state; and

A switch circuit for performing a charge sharing operation on the TFT liquid crystal array when the first detection result or the second detection result is in an active state, so that two adjacent data channels of the TFT liquid crystal array The pixel capacitors perform charge redistribution.

In one embodiment, the liquid crystal display further has a timing controller for sending the display data to the source driver chip capable of reducing heat generation.

In one embodiment, the polarity change detection unit has a register unit for temporarily storing the display data of at least one row.

In one embodiment, the data voltage change detection unit has a register unit for temporarily storing the display data of at least one row.

In order to achieve the aforementioned purpose, the present invention further proposes an information processing device, which has a central processing unit and the aforementioned liquid crystal display.

In a possible embodiment, the information processing device can be a portable computer or a smart handheld device.

Principle of the present invention is:

(1) When the polarities of two display data in the same row are opposite in the first and last two columns of display data, make a first detection result appear active, otherwise, make the first detection result appear inactive ;

(2) When the first detection result is in an inactive state, if the numerical difference between two display data in the same row is greater than a threshold, a second detection result will be in an active state; otherwise, a second detection result will be in an active state. The second detection result shows an inactive state; and

(3) Driving a switch circuit to perform a charge sharing operation on a TFT liquid crystal array when the first detection result or the second detection result is active.

According to this, the present invention can further save the power consumption of the TFT liquid crystal array, thereby reducing the heat generated by the liquid crystal display.

Please refer to FIG. 3 , which shows a block diagram of a liquid crystal display including a source driver chip capable of reducing heat generation of the present invention. As shown in FIG. 3 , a liquid crystal display 100 includes a timing controller 110 , a source driver chip 120 capable of reducing heat generation, and a TFT liquid crystal array 130 . In order to highlight the technical features of the present invention, other components in the liquid crystal display 100 that are not directly related to the present invention, such as a gate driver chip and a backlight module, are not shown in FIG. 3 .

The timing controller 110 is used to transmit display data to the source driver chip 120 which can reduce heat generation through a display data signal S _DISP .

The source driver chip 120 capable of reducing heat generation has a polarity change detection unit 121 , a data voltage change detection unit 122 and a switch circuit 123 .

The polarity change detection unit 121 is used to detect whether there are two display data in the same row with opposite polarities in the front and rear two columns of display data, and if so, make a first detection result S _CS1 appear active, otherwise, Then make the first detection result S _CS1 take an inactive state, and make a signal S _PSM with the same polarity take an active state. In addition, the polarity change detection unit 121 may have a register unit for temporarily storing at least one row of display data.

The data voltage change detection unit 122 is used to determine whether the numerical difference of the two display data of the same row is greater than a threshold value when the signal S _PSM of the same polarity is active, and if so, make a second detection result S _CS2 is active, otherwise, the second detection result S _CS2 is inactive. In addition, the data voltage change detection unit 122 may have a register unit for temporarily storing at least one row of display data.

The switch circuit 123 is used to perform a charge sharing operation on the TFT liquid crystal array 130 when the first detection result S _CS1 or the second detection result S _CS2 is in an active state, so that two adjacent TFT liquid crystal arrays 130 The pixel capacitance in the data channel performs charge redistribution, thereby reducing the settling time of a new pixel voltage.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 4 , which shows a block diagram of an embodiment of an information processing device of the present invention. As shown in FIG. 4 , an information processing device 200 has a central processing unit 210 and a liquid crystal display 220 , wherein the central processing unit 210 is used to communicate with the liquid crystal display 220 and the liquid crystal display 220 is realized by the liquid crystal display 100 . In addition, the information processing device 200 can be a portable computer or a smart handheld device.

According to the above description, the present invention can provide the following advantages:

1. The source driver chip of the present invention that can reduce heat energy generation can carry out a charge sharing operation to a TFT liquid crystal array when the polarity of two display data of the same row in the front and rear two columns of display data is opposite, and in all The charge sharing operation is performed on the TFT liquid crystal array when the polarities of the two display data in the same row are the same but the value difference is greater than a threshold value, thereby further reducing the heat energy generated by a liquid crystal display.

2. The liquid crystal display of the present invention can carry out a charge sharing operation to a TFT liquid crystal array when there are two display data of the same row in the front and rear two column display data, and the polarity of the display data in the two same rows is opposite. The charge sharing operation is performed on the TFT liquid crystal array when the polarity of the data is the same but the value difference is greater than a threshold, thereby further reducing the heat energy generated by the liquid crystal display.

3. The information processing device of the present invention can reduce the heat energy generated by it because it has the aforementioned liquid crystal display.

What is disclosed in the present invention is one of the preferred embodiments. For example, all partial changes or modifications derived from the technical idea of the present invention and easily deduced by those skilled in the art do not depart from the scope of the patent right of the present invention.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand it clearly and grant a patent as soon as possible. Society is for the Most Prayer.

10: Timing controller 21: Source driver 21a: Charge sharing drive unit 21b: Source drive unit 22: Source driver 22a: Polarity change detection unit 22b: Source drive unit 30: TFT liquid crystal array 100: liquid crystal display 110: Timing controller 120: Source driver chips that can reduce heat generation 121: Polarity change detection unit 122: Data voltage change detection unit 123: switch circuit 130: TFT liquid crystal array 200: information processing device 210: central processing unit 220: liquid crystal display

In order to further disclose the specific technical content of the present invention, first please refer to the drawings, wherein: FIG. 1a is a block diagram of a charge sharing control circuit of a conventional liquid crystal display. FIG. 1b shows a working timing diagram of the charge sharing control circuit in FIG. 1a. FIG. 2a is a block diagram of a charge sharing control circuit of another conventional liquid crystal display. FIG. 2b shows a working timing diagram of the charge sharing control circuit in FIG. 2a. FIG. 3 is a block diagram of a liquid crystal display including a source driver chip capable of reducing heat generation of the present invention. FIG. 4 is a block diagram of an embodiment of an information processing device of the present invention.

100: liquid crystal display

110: Timing controller

120: Source driver chips that can reduce heat generation

121: Polarity change detection unit

122: Data voltage change detection unit

123: switch circuit

130: TFT liquid crystal array

Claims (9)

A source driver chip capable of reducing thermal energy generation, which has: A polarity change detection unit, which is used to detect whether there are two display data in the same row with opposite polarities in the front and rear two columns of display data. making the first detection result in an inactive state, and making a signal with the same polarity in an active state; A data voltage change detection unit, used for judging whether the numerical difference of the two display data in the same row is greater than a threshold value when the signals of the same polarity are in the active state, and if so, making a second detection result present an active state, if not, make the second detection result present an inactive state; and A switch circuit, used to perform a charge sharing operation on a TFT liquid crystal array when the first detection result or the second detection result is in an active state, so that two adjacent data channels of the TFT liquid crystal array The pixel capacitors perform charge redistribution. According to the source driver chip capable of reducing heat generation as described in claim 1 of the patent application, the polarity change detection unit has a register unit for temporarily storing at least one column of the display data. According to the source driver chip capable of reducing heat generation as described in item 1 of the patent claims, the data voltage change detection unit has a register unit for temporarily storing at least one row of display data. A kind of liquid crystal display, it has a source driver chip that can reduce heat generation and a TFT liquid crystal array, this source driver chip that can reduce heat generation has: A polarity change detection unit, which is used to detect whether there are two display data in the same row with opposite polarities in the front and rear two columns of display data. making the first detection result in an inactive state, and making a signal with the same polarity in an active state; A data voltage change detection unit, used for judging whether the numerical difference of the two display data of the same row is greater than a threshold value when the signal of the same polarity is in the active state, and if so, making a second detection result present an active state, if not, make the second detection result present an inactive state; and A switch circuit, which is used to perform a charge sharing operation on the TFT liquid crystal array when the first detection result or the second detection result is active, so that two adjacent data channels of the TFT liquid crystal array The pixel capacitors perform charge redistribution. According to the liquid crystal display described in claim 4 of the patent application, it further has a timing controller to transmit the display data to the source driver chip capable of reducing heat generation. The liquid crystal display as described in item 4 of the scope of the patent application, wherein the polarity change detection unit has a register unit for temporarily storing the display data of at least one column. The liquid crystal display as described in item 4 of the scope of the patent application, wherein the data voltage change detection unit has a register unit for temporarily storing the display data of at least one column. An information processing device, which has a central processing unit and a liquid crystal display, wherein the central processing unit is used to communicate with the liquid crystal display, and the liquid crystal display has the features described in any one of items 4 to 7 of the scope of the patent application Said liquid crystal display. The information processing device described in item 8 of the scope of the patent application is a portable computer or a smart handheld device.

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