JPS58143377A - Liquid display panel - 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 The present invention relates to several display panels arranged in the form of a switching matrix for driving liquid crystals on a substrate.Recently, a thin display device has been used as a display device to replace the conventional Of'lT. Development is progressing actively.

Among thin display devices, liquid crystal display devices have low power consumption and
It is superior in terms of driving voltage and has great expectations as a future display device. In general, liquid crystal display devices use either dynamic drive method or static drive method to reduce power consumption and drive voltage.

It is superior in terms of the simplicity of the drive circuit. Static drive type liquid crystal display devices generally have an upper glass substrate,
The lower conductor conductor is placed in the IJ square shape. W: Select the liquid crystal drive element in the drive circuit and apply voltage to the liquid crystal. Mark 7
By using JD'T, you can display any text, graph, or image to the public. A typical conventional circuit diagram is shown in FIG.

FIG. 1 is a circuit diagram in which liquid crystal driving elements are arranged in a matrix on a semiconductor integrated circuit board used in a static driving type liquid crystal display panel. The liquid crystal driving switching transistor (MO8FKT) 3 is mass-produced in matrix form and can be turned on and off by applying a voltage to the gate signal of 2.

When the voltage in the case 2 reaches a certain point, the voltage of the video information input signal 1 traces through the 5 transistors in the on state and reaches the capacitance 4. When the two gates are closed, the voltage applied to the capacitance 4 becomes 1 when the gates are replaced, and the liquid crystal in the liquid crystal cell 5 is turned off. The interfacial effect type liquid crystal and the dynamic scattering effect type liquid crystal display black and white gradation based on the applied voltage.This method has a low Y/C cost because voltage is applied statically to each liquid crystal cell VC. Power and low-voltage drive become weak.

However, since the manufacturing process of semiconductor integrated circuits is complicated,
It is extremely difficult to produce large awns (one or more to several lines both vertically and horizontally) without defects, such as those used for leather elements. For this reason, defects such as disconnection of the image signal application line 1 or short circuit with the substrate may occur. These defects appear as linear defects in the image, and are practically fatal defects.

The purpose of the present invention is to eliminate the conventional defect ligation and to improve the manufacturing process.
The goal is to create a state where there is no problem in the appearance of linear defects that are difficult to completely suppress.

Embodiments of the present invention will be described in detail below with reference to one drawing. FIG. 2 is a circuit diagram showing one example of the present invention, in which liquid crystal driving systems are arranged in a matrix on a semiconductor integrated circuit board used in a static and rotatable liquid crystal display panel. Switching transistor (MOS FET) for liquid crystal class I
5a, 3b, 5c, 5d-.

Image signal holding capacitance 4a, 4b, 4c, 4d
...Liquid crystal display cells 5a, 5b, 5c, 5d
In particular, they are arranged in a matrix. In Figure 2, the arrangement r is shown as 2 x 2 (vertical x horizontal), but in general it can be arranged in any number of n x m both vertically and horizontally.

The two adjacent ice-water cell applied voltage wirings 1a and Ib are connected to a second switching element 6a17a which is turned on at a display cell applied voltage equal to or higher than the threshold value Vt. , 6a, 7a are connected to the switching transistor 3a.

Similarly, the valley switch elements 6b, 7b, 6c, 7c, 6d, and 7d are also marked with the cloth mark 7III'+! [L pressure arrangement? f
M1a, Og connected to IJ Ic, crystal driving transistor 3a.

Gates 3b, 5c, and 3d are connected to gates 2a and 2b, respectively.

Next, the operating method of an embodiment of the present invention will be explained. Figure 3 shows the timing of the voltage applied to each signal line.When displaying an image of 0 TV temple, the timing of the voltage applied to each signal line is 1 from time t1 to wire 1a.
．． 10△t7″T: The voltage sampled from the video signal is added. Distribution 41j!1 bK is time, t1+△t to t1
At +2Δt7, the sampled voltage is applied to the video signal. Gate wiring 2a is film fJl! During one line scan in the horizontal direction (to to tε), the voltage Ve or the cutting edge υ, the transistors 3a, 3b...... The cutting edge is applied to 1a between the 0 time t1 and t1+△t when turning on iON. When the voltage exceeds the threshold voltage of the transistor 6a, 14'-V7, the transistor 6a turns ON, and the transistor 5 in the ON state turns on.
a7. The video signal passes through H and is transferred to the capacitance 4a. Next, during the time 1]t1+△t-tl+2△t,
Similarly, when the video signal applied to the wiring 1b is filtered at a voltage higher than VT, it is connected to the transistor 7a and is transferred to the capacitance 4a. Is the video signal at time t1+Δt~~ 5-t1+2Δt the video signal at time t1~t]10Δt? It will be rewritten. In this way, the C1 capacitance 4 a K is - During the scanning period 11J, the video signal 1g is written twice at 7A, and the video signal written lastly is 4 times 77' in the next frame period. According to this method, if there are M defects in wiring 1a, 1
The voltage applied to a becomes 0 at 9 o'clock time 1 to t1+Δt.

The capacitance 4aK video signal is written between f
L, time t] Since video No. 16 is newly inserted between 10△t and t1+2△t, there is no doubt that the capacitance 4a is defective. - In the unlikely event that the wiring 1b is defective. If there is, the voltage applied to 1b becomes 0 υ, time tl
Image No. 16 between +Δt-t, , +2Δt is not written to the capacitance 4a. However, from time t1 to t
The video between 1+Δt is written 1.

In this way, if one pixel corresponds to one pixel,
Even if the IM becomes defective, the video signal is still 1 from the wiring on the other side.
・Enter 1fL. In this case, the same image number is written in 92 adjacent pixels, so the resolution of the screen may be partially reduced, or the vertical and horizontal division a is 6-100 or more. Ma) The IJ Kushubo device is almost completely absent, and you can observe beautiful images without having to put any effort into it.Teta, -1
Two times in a row, Iqiyi No. 8-Xun Xun was also included in the blood ligature, so it was time to omit the video signal? ＾It can be sped up.

As described above, even if there is a defect in the L9 and video signal writing arrangement in the embodiments of 4., Uhi, and Akira, the display that does not significantly deteriorate the image quality will be the control for the IIIu group display. OK, since the video signal is repeatedly applied to the pixel by 21 times, the pixel writing time can be shortened and reduced to 0. In the above explanation, the second switch elements 6a and 7a (Fig. 2) are PMO8, Nh40S. etc? I'm assuming, but what about a transmission cable? This is an element that turns ON when the vehicle pressure exceeds the threshold value. In addition, as a semiconductor integrated circuit, thin film transistors such as single crystal silicon, amorphous silicon on a glass plate, multilayer silicon, etc. can be used, and thin film transistors such as single crystal silicon on an insulator layer can be used.
It's obvious that

[Brief explanation of the drawing]

Button 1 and 1 are circuit diagrams of conventional liquid crystal drive elements arranged in a box shape, and Figure 2 is a circuit diagram of a conventional liquid crystal drive device arranged in a box shape. This is an example. Figure 6 shows that the circuit in Figure 2 has double 1 ◇ when the voltage is j...target f.
This is a 3-diagram showing the work. 1, 1a, 1b, 1c...Picture gI double number writing 1 2.2a, 2b, 2cm-mountain-Kate 3.3
a, 3b, 3c, 3d... Switching transistor 4.4a, 4b, 4c, 4d-... Capacitance 5.5a, 5b, 5c, 5d=-@Crystal ice water cell 6a, 6b, 6Q , 6d, 7Q, 7b, 7J7d-=-
Application for switching transistors and above

Claims (2)

[Claims] (1) In a liquid crystal display panel in which switching elements for driving the liquid crystal are arranged in a matrix on one substrate constituting the display panel, two adjacent switching elements are connected to the first switching element for driving each liquid crystal. Display cell mark 7II11 where the voltage applied to the display cell is equal to or higher than a certain threshold value.
The second switch element, which turns on at IL pressure, has all valves,
It is connected to a full-featured LCD display panel. (2) The liquid crystal display panel according to item 1, characterized in that the second switching element UMO8) is a transistor element.