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Display driving method and driver
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A technology for display devices and drive devices, which can be applied to static indicators, instruments, etc., and can solve problems such as large power consumption
Inactive Publication Date: 2008-03-05
SEIKO EPSON CORP
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Assuming that the consumption current of one of the operational amplifiers is 100μA, the total consumption current of 64 operational amplifiers is 6.4mA (=100uA×64), and when the power supply voltage of 5V is used, the total power consumption is 32mW (=6.4mA ×5V), consumes a lot of power
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Deformed example 1
[0076] In time synchronization with the decoding circuit 70A outputting the switch control signal SW_CNTA corresponding to the image data D5-D0 (A_A1) to the switches 51A-54A as described above, the other decoding circuits 70B, 70C, . . . , 51C-54C, ... output switching control signals SW_CNTB, SW_CNTC, ... corresponding to the image data D5-D0 (B_A1), D5-D0 (C_A1), .... Instead of this method, as shown in FIG. 6, the decoding circuits 70A, 70B, 70C, . ...sequentially output switching control signals SW_CNTA, SW_CNTB, SW_CNTC,..., more specifically, during the OFF period OFT1, as shown in Figure 5, within a cycle from time t1 to time t7 as the work content, according to the vertical Lines LA, LB, LC, . . . are performed sequentially, so that any one of the operational amplifiers 11-14 to be activated can be identified, and the degree of activation of the amplifier should be identified, as in the above embodiment.
[0077] More specifically, for example, decoding circuit 70A o...
Deformed example 2
[0079] Instead of the operation of Modification 1 above, as shown in FIG. 7 , the decoding circuits 70A, 70B, 70C, ..., that is, the switching control signals SW_CNTA, SW_CNTB, SW_CNTC, ... BL3, . . . In other words, for example, block BL1 is constituted by decoding circuits 70A, 70B, 70C, 70D.
[0080] Moreover, during the OFF period OFT1, as shown in FIG. 5 , within a cycle from time t1 to time t7 as the work content, blocks BL1, BL2, BL3, ... follow the blocks BL1, BL2, BL3, ... proceed sequentially, and simultaneously output the switching control signal SW_CNT from the same decoding circuit 70, for example, simultaneously output the switching control signals SW_CNTA, SW_CNTB, SW_CNTC, ... SW_CNTD output by the decoding circuit 70A. It can further reduce power consumption compared with
[0081] More specifically, it is assumed that: first, during the OFF period OFT1 of the first horizontal synchronization period HSP1, since the decoding circuits 70A-70D output switching co...
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Abstract
A problem arises with related art liquid crystal displays in that the amount of power consumed will not be reduced any further, as a voltage generator circuit to supply power is kept activated. An exemplary method for driving a display uses a first plurality of operational amplifiers to generate a first plurality of voltages of different levels associated with a first plurality of grayscale levels displayable in the display so as to provide the display with a second plurality of grayscale levels out of the first plurality of grayscale levels. The method includes activating a second plurality of operational amplifiers corresponding to the second plurality of grayscale levels out of the first plurality of operational amplifiers, and deactivating remaining operational amplifiers other than the second plurality of operational amplifiers.
Description
[0001] This application is a divisional application of the No. 200410068813.0 patent application for invention filed on July 5, 2004, entitled "Drive Method and Drive Device for Display Device". technical field [0002] The present invention relates to a display device driving method and a driving device for driving a display device such as a liquid crystal panel, and in particular to a plurality of source lines ( Data lines) A driving method and a driving device for a display device that apply various voltages corresponding to multiple gray levels specified by a plurality of image data. Background technique [0003] In order to generate the above-mentioned various potentials in a conventional display device driving device, for example, 64 operational amplifiers are required in order to generate 64 potentials corresponding to 64 gray levels. Assuming that the consumption current of one of the operational amplifiers is 100μA, the total consumption current of 64 operational ...
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