A dual gate drive liquid crystal display array
By adding gate driving lines and changing the connection method in a dual-gate driven liquid crystal display array, the problem of large driving voltage fluctuations in a multi-gate driven liquid crystal display array was solved, resulting in a more stable display effect and lower power consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GOHI MICROELECTRONICS CO LTD
- Filing Date
- 2024-09-05
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies cannot be effectively applied to multi-gate driven liquid crystal display arrays, resulting in large fluctuations in the driving voltage VCOM, which affects the display effect.
A dual-gate driven liquid crystal display array is adopted. By adding two gate driving lines and changing their connection method, the gate driving lines connect liquid crystal molecules of the same color with opposite polarities between adjacent rows, thereby reducing the load requirement for polarity switching of liquid crystal molecules.
It reduces driving voltage fluctuations, improves display quality, and lowers power consumption.
Smart Images
Figure CN118963030B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of display technology, specifically relating to a dual-gate driven liquid crystal display array. Background Technology
[0002] The working principle of a liquid crystal display is that, under the action of an electric field, the alignment of liquid crystal molecules changes, thereby changing the transmittance of an external light source and completing an electro-optical conversion. Then, by using different excitations of the three primary color signals (R, G, and B), and passing through the red, green, and blue primary color filters, color reproduction in the time and spatial domains is achieved.
[0003] Liquid crystal molecules are driven by a driving voltage VCOM. The display effect of the liquid crystal molecules is the same when a positive or negative driving voltage is applied. Liquid crystal molecules driven by positive and negative voltages are defined with different polarities. The applicant disclosed a liquid crystal display array in Chinese invention patent application number 202410743963.4 entitled "A Liquid Crystal Display Array". By changing the arrangement of liquid crystal molecules and the connection relationship between the source and gate driving lines, the gate driving lines and source driving lines are alternately connected to liquid crystal molecules with opposite polarities in different rows and columns, thereby reducing the fluctuation of the driving voltage VCOM.
[0004] However, the applicant's disclosed technical solution in this patent can only be used in single-gate liquid crystal display arrays, and for applications such as... Figure 3 The multi-gate driven (DUAL-GATE) liquid crystal display array shown in the patent cannot be directly applied.
[0005] like Figure 3 As shown, in a dual-gate driven four-color liquid crystal display array, each row of liquid crystal molecules corresponds to two gate driving lines, which means the number of gate driving lines is doubled. However, every two columns of liquid crystal molecules correspond to one source driving line, which means the number of source driving lines is halved. In practical applications, the number of source driving ICs required is reduced, or the number remains the same but the source direction resolution is doubled.
[0006] like Figure 3 In the dual-gate driven liquid crystal display array shown, sub-pixels composed of liquid crystal molecules of different colors are arranged periodically in the horizontal direction, where R represents red, G represents green, B represents green, and W represents white. The positive and negative signs indicate the polarity of the liquid crystal molecules in the sub-pixel. In the vertical direction, two rows constitute one period. Within the same period, sub-pixels of the same color in two rows have opposite polarities. The arrangement typically uses an alternating arrangement of different colors, for example... Figure 3 The positive red sub-pixel R+ in the first row is aligned with the positive blue sub-pixel B+.
[0007] Figure 3In the diagram, the horizontally arranged lines connected to each sub-pixel are gate driving lines G1 to G8. Half of the sub-pixels in each row are connected to the upper gate driving line, and the other half are connected to the lower gate driving line. The vertically arranged lines connected to each sub-pixel are source driving lines. Source driving lines D1 to D4 connect all the sub-pixels in the left and right columns. When switching to monochrome display, this arrangement causes the same color sub-pixels in the same row to have the same polarity. This requires the driving voltage VCOM to switch significantly between positive and negative voltages during the transition, resulting in a large fluctuation in the instantaneous driving capability of the driving voltage VCOM and affecting the display effect. Summary of the Invention
[0008] To overcome the technical defects of the existing technology, the present invention discloses a dual-gate driven liquid crystal display array.
[0009] The dual-gate driven liquid crystal display array of the present invention includes a sub-pixel array arranged in a matrix form. Each row of sub-pixels in the sub-pixel array is composed of multiple horizontally arranged units. Each horizontally arranged unit includes first to fourth sub-pixels of different colors from left to right. The first and second sub-pixels constitute a first half-region, and the third and fourth sub-pixels constitute a second half-region. In the sub-pixel array, every two rows of sub-pixels constitute a row period; sub-pixels of the same color in adjacent rows have opposite polarities, and sub-pixels of the same color in adjacent rows are not in the same half-region. A j-th source driving line is provided between the sub-pixels in columns 2j and 2j-1, and the j-th source driving line connects all sub-pixels in columns 2j and 2j-1; j is a positive integer, i.e., j=1,2,3…; Each row of sub-pixels includes a pair of gate driving lines, which are wavy and periodically pass between the second and third sub-pixels of each horizontal arrangement unit and between adjacent horizontal arrangement units. The pair of gate driving lines includes a first gate driving line located above and a second gate driving line located below. The first gate driving line connects to any sub-pixel A in the first half of the horizontal arrangement unit of the row above and connects to sub-pixels in the same row that have the same color as sub-pixel A. The second gate driving line connects to any sub-pixel B in the second half of the horizontal arrangement unit of the row below and connects to sub-pixels in the same row that have the same color as sub-pixel B. If a row does not have a previous or next row, then the sub-pixels of the previous or next row are not connected. The subpixel array also includes edge gate driving lines located at the top and bottom, which connect only the remaining subpixels in the top and bottom rows that are not connected.
[0010] Preferably, the sub-pixels in the same row or column are arranged in alternating positive and negative polarities.
[0011] Preferably, the first to fourth sub-pixels of different colors are red, green, blue and white, respectively.
[0012] Preferably, the sub-pixels in the first and second halves of each horizontally arranged unit have the same polarity.
[0013] By using the dual-gate driven liquid crystal display array described in this invention, by adding two gate driving lines and changing the connection method of the gate driving lines, the gate driving lines can connect liquid crystal molecules of the same color with opposite polarities between adjacent rows in the dual-gate driven liquid crystal display array. This reduces the load requirements when the polarity of liquid crystal molecules switches in the dual-gate drive, thereby reducing the driving voltage fluctuation. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of a specific embodiment of the dual-gate driven liquid crystal display array of the present invention; Figure 2 This is a schematic diagram of another specific embodiment of the dual-gate driven liquid crystal display array described in this invention; Figure 3 This is a schematic diagram illustrating a specific implementation of a dual-gate driven liquid crystal display array in the prior art; Figure 3 This is a specific waveform diagram for simulating the driving voltage in the existing technology; Figure 5 This is a specific waveform diagram for simulating the driving voltage using the display array described in this invention.
[0015] The labels in the figure are as follows: R+, positive red sub-pixel; R-, negative red sub-pixel; G+, positive green sub-pixel; G-, negative green sub-pixel; B+, positive red sub-pixel; B-, negative red sub-pixel; W+, positive white sub-pixel; W-, negative white sub-pixel; D1, D2, ... D4 represent different source drive lines; and G1, G2 ... G10 represent different gate drive lines. Detailed Implementation
[0016] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0017] The dual-gate driven liquid crystal display array of the present invention includes a sub-pixel array arranged in a matrix form. Each row of sub-pixels in the sub-pixel array is composed of multiple horizontally arranged units. Each horizontally arranged unit includes first to fourth sub-pixels of different colors from left to right. The first and second sub-pixels constitute a first half-region, and the third and fourth sub-pixels constitute a second half-region. In the sub-pixel array, every two rows of sub-pixels constitute a row period; sub-pixels of the same color in adjacent rows have opposite polarities, and sub-pixels of the same color in adjacent rows are not in the same half-region. Using the above sub-pixel arrangement methods, such as Figure 1 As shown by the dashed boxes in three different positions, it can be seen that each sub-matrix consisting of four sub-pixels in a 2x2 matrix formed by the intersection of any two rows and two columns includes four sub-pixels of different colors. This arrangement allows for a uniform color transition in both row and column directions during display.
[0018] A source driving line of the jth generation is provided between the sub-pixels in column 2j and column 2j-1, and the jth source driving line connects all sub-pixels in column j and column j+1; j is a positive integer, i.e. j=1,2,3…; Each row of sub-pixels includes a pair of gate driving lines, which are wavy and periodically pass between the second and third sub-pixels of each horizontal arrangement unit and between adjacent horizontal arrangement units. The pair of gate driving lines includes a first gate driving line located above and a second gate driving line located below. The first gate driving line connects to any sub-pixel A in the first half of the horizontal arrangement unit of the row above and connects to sub-pixels in the same row that have the same color as sub-pixel A. The second gate driving line connects to any sub-pixel B in the second half of the horizontal arrangement unit of the row below and connects to sub-pixels in the same row that have the same color as sub-pixel B. If a row does not have a previous or next row, then the sub-pixels of the previous or next row are not connected. The subpixel array also includes edge gate driving lines located at the top and bottom, which connect only the remaining subpixels in the top and bottom rows that are not connected.
[0019] like Figure 1 The figure shows a specific embodiment of the liquid crystal display array of the present invention. Figure 1 In the image, each row of subpixels contains four subpixels of different colors: red, green, blue, and white, arranged in this order. After considering polarity, the horizontal arrangement of the first row is arranged in the manner of positive polarity red, negative polarity green, positive polarity blue, and negative polarity white.
[0020] The sub-pixels in the same row are arranged alternately according to positive and negative polarities, which reduces the disturbance to the driving voltage when the gate driving lines driving the same row switch polarities, and the display effect is more uniform when they are arranged alternately.
[0021] The horizontal arrangement of sub-pixels of the same color in the second row has the opposite polarity to that in the first row, and is arranged in the order of negative blue, positive white, negative red, and positive green. Similarly, the sub-pixels of the same color in the first and second rows are staggered and located in different columns, and the sub-pixels in the same column are arranged in an alternating pattern of positive and negative polarities. This reduces the disturbance to the driving voltage when the source drive lines driving the same column switch polarities, and the staggered arrangement results in a more uniform display effect.
[0022] Because the gate drive lines are wavy and periodically pass between the second and third sub-pixels of each horizontally arranged unit and between adjacent horizontally arranged units, and need to connect sub-pixels of the same color but opposite polarity in adjacent rows, sub-pixels of the same color in two adjacent rows need to be set in different half-regions; for example Figure 1 As shown, the red and green sub-pixels in the first row of horizontally arranged units are the first and second sub-pixels, respectively, located in the first half of the region. The red and green sub-pixels in the second row of horizontally arranged units are the third and fourth sub-pixels, respectively, located in the second half of the region.
[0023] like Figure 1 As shown, the pair of gate driving lines in the first row includes the first gate driving line G2 and the second gate driving line G3 located above. Since there is no previous row in the first row, the first gate driving line does not connect to the sub-pixels of the previous row, but only connects to the negative white sub-pixels of the second half of the row. The second gate driving line connects to the positive red sub-pixels of the first half of the row, and also connects to the negative red sub-pixels of the next row, i.e., the second row. The second row has a pair of gate driving lines, including the first gate driving line G4 and the second gate driving line G5 located above. The first gate driving line in this row is connected to the negative green sub-pixel G- in the first half of the previous row, and to the positive green sub-pixel G+ in the second half of this row. The second gate driving line is connected to the negative blue sub-pixel B- in the first half of this row, and also to the negative blue sub-pixel B+ in the next row, the third row.
[0024] Similarly, the first gate driving line G6 in the third row connects to the positive white sub-pixel W+ in the first half of the previous row (i.e., the second row), and to the negative white sub-pixel W- in the second half of this row. The second gate driving line G7 in the third row connects to the positive red sub-pixel R+ in the first half of this row, and also to the negative red sub-pixel R- in the next row (i.e., the fourth row).
[0025] The first gate driving line G8 in the fourth row is connected to the negative green sub-pixel G- in the first half of the previous row (i.e., the third row), and is also connected to the positive green sub-pixel G+ in the second half of this row. The second gate driving line G9 in the fourth row is connected to the negative blue sub-pixel B- in the first half of this row. There is no next row in the fourth row, so it is not connected to the next row.
[0026] The two edge gate driving lines located at the top and bottom of the sub-pixel array are connected to the remaining sub-pixels of the first and fourth rows, respectively. The gate driving line G1 at the top is connected to the positive blue sub-pixel of the first row, and the gate driving line G10 at the bottom is connected to the positive white sub-pixel W+ of the fourth row, ensuring that each sub-pixel has one and only one gate driving line connected to it.
[0027] Figure 1 In the case of monochrome display, for example, when only red is displayed, the second gate drive line G3 of the first row connects all the positive red sub-pixels of the first row and all the negative red sub-pixels of the second row. Overall, the positive and negative polarities tend to be balanced. In this way, when switching frames, it is not necessary to switch the driving voltage required by all sub-pixels from positive to negative or from negative to positive.
[0028] In this way, the gate driving lines G3 to G8 in the sub-pixel array are connected in complementary polarity. These gate driving lines are connected to two adjacent rows of sub-pixels with the same color and opposite polarity. When switching frames, it is not necessary for all the driving voltages required by the sub-pixels to be switched from positive to negative or from negative to positive. Instead, 50% are switched from positive to negative and the remaining 50% are switched from negative to positive. The disturbance to the driving voltage VCOM is significantly reduced to close to zero.
[0029] In practical applications, there are usually hundreds of gate drive lines. Although the gate drive lines G1 and G2 at the top and the gate drive lines G9 and G10 at the bottom are not complementary, these four gate drive lines only account for a small part of the total number of gate drive lines, and their disturbance to the drive voltage VCOM can be basically ignored.
[0030] Figure 1 In the specific embodiment shown, the first and second column sub-pixels are both driven by the first source driving line D1, and the third and fourth column sub-pixels, the fifth and sixth column sub-pixels, and the seventh and eighth column sub-pixels are driven by the second, third, and fourth source driving lines D2, D3, and D4, respectively. Each source driving line drives the left and right column sub-pixels.
[0031] Figure 2 Another specific embodiment of the present invention is given, and Figure 1 The difference in the specific implementation shown is that, Figure 2In the specific implementation shown, the horizontal arrangement units of each row were changed so that the polarity of the sub-pixels in the first and second halves of each horizontal arrangement unit is the same, so that the polarity of the two different colored sub-pixels connected by each source drive line in the same row is the same.
[0032] For example, the first source driver line D1 connects to positive red and green sub-pixels in the first row, and positive blue and white sub-pixels in the second row; the second source driver line D2 connects to negative blue and white sub-pixels in the first row, and negative red and green sub-pixels in the second row. Clearly, swapping... Figure 2 The polarity of elements of the same color within the dashed frame can also achieve the same polarity for two sub-pixels of different colors connected in the same row by the source driving lines, without affecting the complementary polarity connection and display effect of the gate driving lines.
[0033] use Figure 2 The specific implementation shown can avoid frequent switching of the source drive line during the display process, thereby reducing power consumption.
[0034] like Figure 4 and Figure 5 Simulation diagrams of the gate drive voltage for both existing technologies and the present invention are provided. Figure 4 and Figure 5 In the middle, from top to bottom are respectively Figure 1 The diagram shows odd-numbered source drive lines and even-numbered source drive lines. The odd-numbered source drive lines D1, D3... have the same drive signal, and the even-numbered source drive lines D2, D4... have the same drive signal. The third row shows the drive voltage, with the horizontal axis representing time in microseconds and the vertical axis representing voltage in volts.
[0035] It can be seen that, under the same source drive level, the drive voltage fluctuation reaches 200 millivolts in the prior art, while after adopting the complementary connection of the present invention, the drive voltage fluctuation is reduced to about 40 millivolts.
[0036] The liquid crystal display array described in this invention uses gate driving lines and source driving lines to connect liquid crystal molecules with opposite polarities between different rows and columns, which reduces the load requirements when the polarity of liquid crystal molecules in a single row and column switches, thereby reducing driving voltage fluctuations and improving the display effect.
[0037] The foregoing descriptions are preferred embodiments of the present invention. Unless there is a clear contradiction between the preferred embodiments or a prerequisite for a particular preferred embodiment, the preferred embodiments can be arbitrarily combined and used. The embodiments and specific parameters described are only for clearly illustrating the inventor's invention verification process and are not intended to limit the scope of patent protection of the present invention. The scope of patent protection of the present invention shall still be determined by its claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.
Claims
1. A dual-gate driven liquid crystal display array, characterized in that, It includes a subpixel array arranged in a matrix form. Each row of subpixels in the subpixel array consists of multiple horizontally arranged units. Each horizontally arranged unit includes first to fourth subpixels of different colors from left to right. The first and second subpixels form the first half-region, and the third and fourth subpixels form the second half-region. In the sub-pixel array, every two rows of sub-pixels constitute a row period; sub-pixels of the same color in adjacent rows have opposite polarities, and sub-pixels of the same color in adjacent rows are not in the same half-region. A j-th source driving line is provided between the sub-pixels in columns 2j and 2j-1, and the j-th source driving line connects all sub-pixels in columns 2j and 2j-1; j is a positive integer, i.e., j=1,2,3…; Each row of subpixels includes a pair of gate driving lines that are wavy and periodically pass between the second and third subpixels of each horizontally arranged unit and between adjacent horizontally arranged units. The pair of gate driving lines includes a first gate driving line located above and a second gate driving line located below. The first gate driving line connects to any sub-pixel A in the first half of the horizontal arrangement unit of the row above and connects to a sub-pixel in the row that has the same color as sub-pixel A. The second gate driving line connects to any sub-pixel B in the second half of the horizontal arrangement unit of the row below and connects to a sub-pixel in the row that has the same color as sub-pixel B. If a row does not have a previous or next row, then the sub-pixels of the previous or next row are not connected. The subpixel array also includes edge gate driving lines located at the top and bottom, which connect only the remaining subpixels in the top and bottom rows that are not connected.
2. The liquid crystal display array as described in claim 1, characterized in that, Subpixels in the same row or column are arranged alternately according to positive and negative polarities.
3. The liquid crystal display array as described in claim 1, characterized in that, The first to fourth sub-pixels of different colors are red, green, blue, and white, respectively.
4. The liquid crystal display array as described in claim 1, characterized in that, The sub-pixels in the first and second halves of each horizontally arranged unit have the same polarity.