JPS62249195A - Liquid crystal display unit driving system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a driving method for a liquid crystal display device, and particularly to a driving method suitable for changing the display detent of a liquid crystal panel.

[Conventional technology]

FIG. 3 is a plan view of essential parts showing the basic configuration of a conventional liquid crystal display device. In the figure, 1 is a liquid crystal channel in which a plurality of liquid crystal pixels are arranged in a matrix, and 2 is a liquid crystal panel 1.
A shift register for data transfer (
The display electrode driving IC 3 is a scan electrode driving IC consisting of a shift register and a liquid crystal driver connected to the scanning electrodes of the liquid crystal panel 1. (Nikkei Electronics J August 18, 1980 issue, pages 162-174) Also, Figures 4 (&) to (C) show the timing of the output signals of the liquid crystal display device shown in Figure 3. Ruru.

In such a configuration, when ON/OFF information signals of all pixels on a certain scanning electrode are serially input to the display electrode driving IC 2, the shift register is activated by the data transfer signal CL shown in FIG. Shift the data. When the serial data becomes full in the shift register, the transfer signal CL, 1 for the latch signal/scanning electrode driving IC 3 shown in FIG. 4(b) is outputted and latched by the latch circuit. In this case, this latch signal/transfer signal CL1 is applied with one pulse between after the display data transfer of one scan line ends and before the display data transfer of the next scan line starts.

This latch data switches the analog multiplexer and outputs selection and non-selection pulses.

In this case, since the serial data appears as a display signal after one scanning period (the period of the latch signal/transfer signal CL1), it is necessary to shift the scanning signal as well.

This scanning signal is generated using a scanning electrode drive IC, as shown in Fig. 4 (
The display start signal FLM shown in c) is used as a data input, and an output can be obtained by shifting with the latch signal/transfer signal CL1.

[Problem that the invention seeks to solve]

However, the liquid crystal display device configured in this way is
For example, the liquid crystal panel 1 having m scanning lines is 2/r.
When driven with n days, there was a problem in that the same screen was displayed on the upper and lower sides of the liquid crystal panel 1.

It is an object of the present invention to provide a low power type liquid crystal display device that does not cause the screen to be manipulated even when the display duty is n times and I~.

[Failure to solve the problem]

In the driving method of the liquid crystal display device according to the present invention, the transfer signal of the scan electrode drive IC is continuously transmitted once near the end of the display data transfer of (1) scan (U) and (R), and the display start signal is transmitted at the first It outputs so that it becomes "1" during the period in which n consecutive scanning line shift signals corresponding to n lines are added.

[Effect]

In the present invention, each n scanning line is displayed in the same way,
The vertical lines on the screen become thicker, and the screen no longer displays repeatedly.

〔Example〕

Next, the present invention will be explained in detail using the drawings.

FIGS. 1(-), (b), and (c) show control signal timings of a liquid crystal display device driving IC for explaining one embodiment of a driving method for a liquid crystal display device according to the present invention. In the same figure, the driving method according to the present invention is shown in FIG. The scanning electrode drive IC 3 (see Fig. 3) outputs n transfer signals CL1' (n≧2) continuously, and the display start signal FLM shown in Fig. The output is performed so that the period in which the number of transfer signals CL'' is added becomes "1". As a result, it is impossible to transfer n scanning lines at the same time, and the timing is slightly different, but they are transferred continuously in a short time, and n
The same display is performed on the scanning lines at the same time. Note that CL1' shown in FIG. 3B is a latch signal for the display electrode drive IC, and is output at the same timing as the latch signal for the display electrode drive IC and shift signal CLI for the scan electrode drive IC.

FIGS. 2(-), 2(b), and 2(c) are control signal timing diagrams of a liquid crystal display device driving IC for explaining another embodiment of the liquid crystal display device driving method according to the present invention. In the figure, the scan electrode drive IC transfer signal CL1'' shown in FIG. n pulses are applied before the start of the transfer signal CL2.During this period, the display data does not change, so even if the display electrode drive IC2 is latched once, the display is the same as when it is latched once.In this case, the display Latch signal CL1 of electrode drive IC2 and scan electrode drive IC3
There is an advantage that the transfer signal CL1' is shared.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to display the same image every n scanning lines, so even if the display duty is multiplied by n, there is no repeated display of the screen, and low-resolution display is possible. Effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a control signal timing diagram of a liquid crystal display device driving IC for explaining one embodiment of the driving method of a liquid crystal display device according to the present invention, and FIG. 2 is a control signal timing diagram for explaining another embodiment of the present invention. FIG. 3 is a basic configuration diagram of a liquid crystal display device, and FIG. 4 is a control signal timing diagram of a conventional liquid crystal display device drive rc. 1...Liquid crystal panel, 2...Display electrode driving IC
l3... Scanning electrode driving IC.

Claims (1)

[Claims] 1. A liquid crystal panel in which a plurality of liquid crystal pixels are arranged in a matrix, a display electrode drive IC including a data transfer shift register (or latch), a latch, and a liquid crystal driver connected to signal electrodes of the liquid crystal panel; In a liquid crystal display device comprising a shift register connected to a scan electrode of the liquid crystal panel and a scan electrode drive IC consisting of a liquid crystal driver, the scan starts near the end of data transfer signals of the display electrode drive IC for one line. Continuously add n shift signals (n≧2) of the electrode drive IC,
A driving method for a liquid crystal display device, characterized in that a display start signal is applied over a period in which the first consecutive n shift signals are applied at the start of screen display of the scan electrode driving IC.