TWI388897B - Liquid crystal display and driving method thereof - Google Patents

Description

Liquid crystal display and driving method thereof

The present invention relates to a liquid crystal display and a method of driving the same.

Due to its small size, light weight, thin thickness, low power consumption, no flicker, and low radiation, liquid crystal displays have been widely used in electronic devices such as televisions, notebook computers, mobile phones, and personal digital assistants.

Please refer to FIG. 1 , which is a schematic diagram of a circuit structure of a prior art liquid crystal display. The liquid crystal display 100 includes a scan driving circuit 110, a data driving circuit 120, and a liquid crystal display panel 130.

The liquid crystal display panel 130 includes a plurality of mutually parallel scan lines 101, a plurality of data lines 102 that are parallel to each other and vertically insulated from the scan lines 101, a plurality of thin film transistors 150, and a plurality of pixel electrodes 140. The complex scan line 101 and the complex data line 102 define a plurality of pixel regions arranged in a matrix. Each pixel region corresponds to a pixel electrode 140 and a thin film transistor 150. The thin film transistor 150 includes a gate (not shown) connected to the scan line 101, a source (not labeled) connected to the data line 102, and a drain (not labeled) connected to the corresponding pixel electrode 140.

When the liquid crystal display device 100 is in normal operation, the scan driving circuit 110 sequentially supplies a plurality of scan signals to the plurality of scan lines 101. When the scan signal is applied to the scan line 101, the scan line 101 is sequentially turned on correspondingly connected to the plurality of thin film transistors 150. The plurality of gray scale voltages supplied from the data driving circuit 120 are applied to the corresponding pixel electrodes 140 via the correspondingly turned-on thin film transistors 150. Thereby, the pixel area corresponding to the pixel electrode 140 The image of the corresponding grayscale is displayed.

However, since each pixel area requires a corresponding data line 102 to be driven, the liquid crystal display 100 requires more data lines 102 to cooperate to drive the plurality of pixel areas. For example, if the liquid crystal display panel 130 is a general XGA type panel, it has 1024 × 3 × 768 pixel areas, so 1024 × 3 = 3072 data lines and 768 scanning lines are required. Moreover, the more data lines 102 directly cause the distance between the plurality of data lines 102 to be smaller, thereby increasing the difficulty of the data driving circuit 120 and the liquid crystal display panel 130. In addition, since the data line 102 is provided on the panel, the aperture ratio of the liquid crystal display panel 130 is also small.

In view of this, it is necessary to provide a liquid crystal display with less data lines. It is also necessary to provide a driving method of the above liquid crystal display.

A liquid crystal display comprising a liquid crystal display panel. The liquid crystal display panel includes a plurality of scan line groups, a plurality of data lines, and a plurality of pixel electrodes. Each of the scan line groups includes two adjacent scan lines. The plurality of scan lines are configured to receive the external plurality of scan signals in a predetermined order, the plurality of scan signals sequentially scanning the plurality of scan line groups and causing the scan lines of the adjacent two scan line groups to be scanned in the reverse order. The data line is configured to receive an external complex gray scale voltage signal, and the pixel electrode is configured to receive the gray scale voltage. Each of the data lines and the two scan lines of each scan line group are electrically connected to the two pixel electrodes.

A liquid crystal display driving method includes a plurality of scanning line groups, a plurality of data lines, and a plurality of pixel electrodes. Each scan line group includes two adjacent scan lines, each data line and each scan line group and two scan lines Correspondingly, the two pixel electrodes are electrically connected. The liquid crystal display driving method includes: providing a first scanning method for scanning an odd number of scanning line groups; providing a second scanning method for scanning an even number of scanning line groups; and providing a plurality of scanning signals according to the first and second scanning methods in sequence Scan the complex scan line group.

Compared with the prior art, each data line of the above liquid crystal display and its driving method corresponds to a two-pixel electrode between scan line groups, so that the number of data lines is small. Therefore, the aperture ratio of the liquid crystal display panel of the less data line is large. Moreover, due to the small number of data lines, the data driving circuit and the liquid crystal display panel are less difficult to process.

Please refer to FIG. 2, which is a schematic diagram of the circuit structure of the liquid crystal display of the present invention. The liquid crystal display 200 includes a scan driving circuit 210, a data driving circuit 220, and a display panel 230. The scan driving circuit 210 is configured to provide a plurality of scan signals to the liquid crystal display panel 230. The data driving circuit 220 is configured to provide a plurality of gray scale voltages to the liquid crystal display panel 230 when the liquid crystal display panel 230 is scanned.

The liquid crystal display panel 230 includes a plurality of mutually parallel scanning lines G ₁ to G _2n (n≧1, n is an integer), and a plurality of data lines D ₁ to D _m (m≧1) which are parallel to each other and perpendicularly intersect with the scanning line. , m is an integer), a plurality of thin film transistors 250, and a plurality of pixel electrodes 240. The plurality of scanning lines G ₁ ... G _2m extend horizontally and are connected to the scan driving circuit 210, and the plurality of data lines D ₁ ... D _n extend vertically and are connected to the data driving circuit 220.

The plurality of thin film transistors 250 are respectively disposed at intersections of the plurality of scanning lines G ₁ to G _2n and the plurality of data lines D ₁ to D _m . Each of the thin film transistors 250 includes a gate (not shown) connected to the corresponding scan line, a source (not labeled) connected to the corresponding data line, and a drain (not labeled) connected to the pixel electrode 240.

The plurality of pixel electrodes 240 are disposed between each odd scan line and the next adjacent even number of scan lines. Each pixel electrode 240 corresponds to a pixel area.

Between each two adjacent scan lines, each data line is connected to the two-pixel electrode 240 via a source and a drain of the two thin film transistors 250, and the data line is located between the two pixel electrodes 240. The gates of the two thin film transistors 250 are respectively connected to the two adjacent scan lines.

Please refer to FIG. 3 together with the scanning signal timing diagram of the first embodiment of the driving method of the liquid crystal display 200 shown in FIG. 2 . When the liquid crystal monitor 200 to work: t0 ~ t1 period, the scan lines G ₁ is applied to a scan signal g _1. The pulse of the scanning signal g ₁ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{1 such that} the plurality of thin film transistors 250 connected to the scanning line G ₁ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₂ .

During the period from t1 to t2, the scanning line G ₂ is applied with a scanning signal g ₂ . The pulse of the scanning signal g ₂ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{2 such that} the plurality of thin film transistors 250 connected to the scanning line G ₂ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₂ .

During the period from t2 to t3, the scanning line G ₄ is applied with a scanning signal g ₄ . The pulse of the scanning signal g ₄ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{4 such that} the plurality of thin film transistors 250 connected to the scanning line G ₄ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₄ .

During the period from t3 to t4, the scanning line G ₃ is applied with a scanning signal g ₃ . The pulse of the scanning signal g ₃ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{3 such that} the plurality of thin film transistors 250 connected to the scanning line G ₃ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₃ .

Thereafter, the driving order of the scanning signals is similar to that between the t0 and t4 periods, that is, sequentially scanned in the order of G _{2 i -1} → G _2i → G _{2i + 2} → G _{2i + 1} (1≦i≦n-1). .

Compared to the prior art, each data line of the liquid crystal display 200 drives a two-pixel area in the horizontal direction. Therefore, if the liquid crystal display panel 201 is an XGA type panel, only 3072÷2=1536 data lines are needed, and the data line used by the liquid crystal display panel 201 is greatly reduced. Therefore, the aperture ratio of the liquid crystal display panel 201 is large. Moreover, due to the small number of data lines, the data driving circuit and the liquid crystal display panel are less difficult to process. Further, the display effect of the liquid crystal display 200 does not have a problem of display difference.

Please refer to FIG. 4 , which is a timing diagram of the scan signal of the second embodiment of the liquid crystal display 200 driving method shown in FIG. 2 . When the liquid crystal monitor 200 to work: t0 ~ t1 period, the scanning line G ₂ is applied to a scan signal g _2. The pulse of the scanning signal g ₂ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{2 such that} the plurality of thin film transistors 250 connected to the scanning line G ₂ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₂ .

During the period from t1 to t2, the scanning line G ₁ is applied with a scanning signal g ₁ . The pulse of the scanning signal g ₁ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{1 such that} the plurality of thin film transistors 250 connected to the scanning line G ₁ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₂ .

During the period from t2 to t3, the scanning line G ₃ is applied with a scanning signal g ₃ . The pulse of the scanning signal g ₃ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{3 such that} the plurality of thin film transistors 250 connected to the scanning line G ₃ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₃ .

During the period from t3 to t4, the scanning line G ₄ is applied with a scanning signal g ₄ . The pulse of the scanning signal g ₄ is applied to the gate of the plurality of thin film transistors 250 corresponding to the scanning line G _{4 such that} the plurality of thin film transistors 250 connected to the scanning line G ₄ are turned on. Therefore, the complex data lines D ₁ -D _m apply a plurality of gray scale voltages to the corresponding pixel electrodes 240 via the plurality of thin film transistors 250 connected to the scan lines G ₄ .

Thereafter, the driving order of the scanning signals is similar to that between the t0 and t4 periods, that is, sequentially scanned in the order of G _2i → G _2i-1 → G _2i+1 → G _{2i + 2} (1≦i≦n-1).

In fact, if the plurality of scan lines G ₁ from the beginning of each two scan lines are divided into a group, then a plurality of scan line groups may be obtained. Each scan line group includes an odd number of scan lines and an even number of scan lines. Then, according to the scanning signal timing chart described above, the scanning lines of the adjacent scanning line groups are scanned in the reverse order. That is, if the scanning order of the two scanning lines of the previous scanning line group is odd and even (first scanning odd-numbered scanning lines, then scanning even-numbered scanning lines), the scanning order of the second scanning lines of the latter scanning line group is It’s odd after the first. The plurality of scan line groups are sequentially scanned, and only one scan line is scanned at any one time. Therefore, the scanning order of the two scanning lines of all the odd scanning line groups is the same, and the scanning order of the two scanning lines of all the even scanning line groups is the same and opposite to the odd scanning line group.

In addition, the liquid crystal display 200 may also include scan lines of adjacent scan line groups having the same scanning order.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

200‧‧‧LCD display

210‧‧‧Scan drive circuit

220‧‧‧Data Drive Circuit

230‧‧‧LCD panel

240‧‧‧pixel electrode

250‧‧‧film transistor

G ₁ ~G _2n ‧‧‧ scan line

D ₁ ~D _m ‧‧‧ data line

1 is a schematic diagram of a circuit structure of a prior art liquid crystal display.

2 is a schematic view showing the circuit structure of a liquid crystal display used in the driving method of the liquid crystal display of the present invention.

3 is a timing chart of scanning signals of the first embodiment of the liquid crystal display driving method of the present invention.

4 is a timing chart of scanning signals of a second embodiment of the liquid crystal display driving method of the present invention.

LCD monitor ‧‧200

Pixel electrode ‧‧‧240

Scan drive circuit ‧‧‧210

Thin film transistor ‧‧250

Data drive circuit ‧‧‧220

Scanning line ‧‧‧G ₁ ~G _2n

LCD panel ‧‧230

Information line ‧‧‧D ₁ ~D _m

Claims (17)

A liquid crystal display comprising a liquid crystal display panel, the liquid crystal display panel comprising: a plurality of scan line groups, each of the scan line groups comprising two adjacent scan lines, the plurality of scan lines being used for receiving external multiple scans in a predetermined order a signal, the plurality of scan signals sequentially scan the plurality of scan line groups and cause the scan lines of the adjacent two scan line groups to be scanned in opposite order; the plurality of data lines are used to receive external complex gray scale voltage signals And a plurality of pixel electrodes disposed between two scan lines of each scan line group, wherein the pixel electrodes are configured to receive the gray scale voltage; wherein the two pixel electrodes between the two scan lines of each scan line group are the same Data line connection. The liquid crystal display of claim 1, wherein a data line connecting the two pixel electrodes between the two scan lines of each scan line group is located between the two pixel electrodes. The liquid crystal display of claim 1, further comprising a scan driving circuit and a data driving circuit, wherein the scan driving circuit is configured to provide the plurality of scanning signals, and the data driving circuit is configured to provide the complex gray scale voltage . The liquid crystal display of claim 1, wherein the plurality of scan lines are parallel to each other, and the plurality of data lines are parallel to each other and vertically insulated from the scan lines. The liquid crystal display of claim 3, wherein each pixel electrode corresponds to a pixel area, and each data line drives a corresponding pixel area corresponding to the two pixel electrodes in a horizontal direction. The liquid crystal display device of claim 4, wherein the liquid crystal display panel further comprises a plurality of thin film transistors disposed at the intersection of the plurality of scan lines and the plurality of data lines and the plurality of pixel electrodes Correspond respectively. The liquid crystal display of claim 6, wherein each of the thin film transistors comprises a gate connected to the scan line, a source connected to the data line and a drain connected to the corresponding pixel electrode. The liquid crystal display of claim 1, wherein the scan lines of the scan line group are an odd number of scan lines and a second even number of scan lines. The liquid crystal display of claim 8, wherein an odd number of scan lines of the scan line group are scanned before an even number of scan lines, and an even number of scan lines of the next adjacent scan line group precedes an odd number. The scan line is scanned but is followed by an even number of scan lines of the scan line group. The liquid crystal display of claim 1, wherein only one scanning line is scanned at any one time. The liquid crystal display of claim 1, wherein the scan order of the two scan lines of all the odd scan line groups is the same, and the scan order of the scan lines of all the even scan line groups is the same and the odd scan lines. The opposite is true. A liquid crystal display driving method, the liquid crystal display comprising a plurality of scans a line group, a plurality of data lines, and a plurality of pixel electrodes, each of the scan line groups includes two scan lines, and two pixel electrodes between the two scan lines of each scan line group are connected to the same data line, and the liquid crystal display driving method includes: providing a first scanning mode for scanning a first partial scanning line group; a second scanning mode for scanning a second partial scanning line group, wherein the first scanning mode is for the first partial scanning line group The scanning order of the two scanning lines is different from the scanning order of the two scanning lines of the second partial scanning line group. The liquid crystal display driving method of claim 12, wherein the first partial scan line group is an odd scan line group, and the second partial scan line group is an even scan line group. The liquid crystal display driving method of claim 13, wherein the two scan lines of each scan line group are adjacent to one of the first scan lines and the second scan line. The method of driving a liquid crystal display according to claim 14, wherein the first scanning mode comprises scanning the first scanning line first, and then scanning the second scanning line, wherein the second scanning mode comprises scanning the second scanning first. Scanning the line, and then scanning the first scan line. The liquid crystal display driving method of claim 14, wherein the first scanning mode comprises scanning the second scanning line first, and then scanning the first scanning line, wherein the second scanning mode comprises scanning the first scanning first. Scan the line and scan the second scan line. The liquid crystal display driving method according to claim 12, wherein the plurality of scanning line groups are sequentially scanned in the order of parity and alternating Description.