The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
As shown in
As each gate line, such as GL1, is activated, display data of different polarities on data lines DL1, DL2, DL3, . . . , DL6 is input to the pixels R11, G11, B11, R21, G21, B21. However, due to coupling effect, each pixel is affected by display data on adjacent data lines. For example, the pixel R11 is driven by the display data with a positive polarity on the data line DL1 and affected by the display data with a negative polarity on the adjacent data line DL2. The pixel G11 is driven by the display data with a negative polarity on the data line DL2 and affected by the display data with a positive polarity on the adjacent data line DL3, and so on. Thus, the pixels cannot remain at the desired voltage level due to the display data on the adjacent data line, referred to coupling noise. Low coupling noise induces effects upon each pixel because different color pixels have different driving voltage. For example, coupled noise caused by the display data with a negative polarity on the adjacent data line DL2 has a great effect on the pixel R11, and so on. Because of this, brightness of pixels occurs with the lower area of the panel more serious for bright/dark line defect than the upper portion.
The data line DL1 is coupled to the pixels R11, B0, and R13, the data line DL2 is coupled to the pixels G11, R12, and G13, and the data line DL3 is coupled to the pixels B11, G12, and B13. The data line DL4 is coupled to the pixels R21, B12, and R23, the data line DL5 is coupled to the pixels G21, R22, and G23, and the data line DL6 is coupled to the pixels B21, G22, and B23. The data line DL7 is coupled to the pixels R31, B22, and R33, and so on.
The gate line GLI is coupled to the pixels R11, B11, G21, B31 and so on. The gate line GL2 is coupled to the pixels B0, G11, G12, R21, R22, B21, B22 and so on. The gate line GL3 is coupled to the pixels R12, R13, B12, B13, G22, G23, B33 and so on. The gate line GL4 is coupled to the pixels G13, R23, B23 and so on.
Namely, the gate line GL2 is coupled to a pair of pixels G11 and G12 displaying green color, a pair of pixels R21 and R22 displaying red color, and a pair of pixels B21 and B22 displaying blue color. The gate line GL3 is coupled to a pair of pixels R12 and R13 displaying red color, a pair of pixels B12 and B13 displaying blue color and a pair of pixels G22 and G23 displaying green color, and so on.
To obtain display quality as driven by dot inversion, the display panel 200 is driven by column inversion.
For example, in a current frame (as shown in
In the embodiment, when one gate line is scanned, pixels disposed on two sides of each driven gate line are not driven. For example, if gate line GL1 is scanned by the scan driver 220, the pixels R11, B11, G21 and R31 are driven and the pixels G11, R21, B21 are not. As the gate line GL2 is scanned by the scan driver 220, the pixels B0, G11, G12, R21, R22, B21 and B22 are driven and the pixels R12, B12, G22 are not. As the gate line GL3 is scanned by the scan driver 220, the pixels R12, R13, B12, B13, G22, G23 and B33 are driven, and pixels B0, G12, G13, R22, R23, B22 and B23 are not driven, and so on.
Because each driven pixel and pixels disposed on two sides thereof are not driven at the same time, display data for the other color from adjacent data lines does not affect the driven pixel, and thus coupled noise and bright/dart line defect can be reduced.
In the effective display period of the frame period FD2, the scan driver 220 scans the all gate lines, such as GL1, GL2, GL3 and . . . , in sequence, while the data driver 230 provides negative polarity display data on the odd-numbered data lines DL1, DL3, DL5 and GL7 and positive polarity display data on the even-numbered data lines DL2, DL4 and DL6. Next, in the blanking period BP1, all data lines, DL1, DL2, DL3 and . . . , are coupled to the common voltage (not shown), wherein the ratio of the blanking period BP1 to the frame period FD1 or FD2 exceeds 5%.
As shown, the wave 3B illustrates the display panel 200 driven by column inversion, in which the blanking period BP1 is extended to half frame period FD3 such that the frame rate is lower to 30 Hz. In an effective display period EDP of the frame period FD1, the scan driver 220 scans all gate lines, such as GL1, GL2, GL3 and GL4, in sequence, while the data driver 230 provides positive polarity display data on the odd-numbered data lines DL1, DL3, DL5 and GL7 and negative polarity display data on the even-numbered data lines DL2, DL4 and DL6. Next, in a blanking period BP2, all data lines, DL1, DL2, DL3 and . . . , are coupled to a common voltage (not shown).
In the effective display period of the frame period FD2, the scan driver 220 scans the all gate lines, such as GL1, GL2, GL3 and . . . , in sequence, while the data driver 230 provides negative polarity display data on the odd-numbered data lines DL1, DL3, DL5 and GL7 and positive polarity display data on the even-numbered data lines DL2, DL4 and DL6. Next, in the blanking period BP1, all data lines, DL1, DL2, DL3 and . . . , are coupled to the common voltage (not shown).
Table 1 shows simulated results of the voltage difference between adjacent pixels in display panels under different frame rates. In this case, the voltage difference between pixels in the same column can be regarded as coupling noise disclosed above, the display panel 100 shown in
In view of this, the new pixel structure in the display panel 200 can lower coupling noise (the voltage difference between pixels in the same column) to 44 mV, and further lower it to 22 mV when cooperating with blanking period which is half frame period.
While the invention has been described by way of example and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.