JPH0712973Y2 - Liquid crystal display element - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid crystal display device in which upper and lower substrates made of a polymer film are extended to form electrode portions for connection with an external circuit substrate. Can be used as display means in various technical fields.

[Prior art]

The applicant of the present application has developed a structure of an electrode extraction portion having a novel feature of making a connection with an external circuit board in a liquid crystal display device as shown in FIG. That is, this is the case where a polymer film is used as the upper and lower substrates 1 and 2 of the liquid crystal display element, and the upper and lower substrates 1 and 2 are extended from the sealing material 6 to form the electrode lead-out portions 7 and 8, and an external thicker than the sealing material 6. The present invention relates to a structure of an electrode lead-out portion of a liquid crystal display element having a structure in which a circuit board 9 can be mounted between upper and lower boards 1 and 2 and the sealing material 6 is not affected in the mounting. .

A general liquid crystal display element is composed of a gap of several μ to several tens of μ, and therefore the sealing material 6 is also made to have a thickness similar to this gap. When the upper and lower substrates 1 and 2 made of a polymer film have a thickness of 0.1 mm, the external circuit board 9 usually has a thickness of the upper outer electrode 1.
4. With the lower outer electrode 15 and the like, the thickness is about 0.1 to 0.2 mm. Therefore, the thickness of the external circuit board 9 is larger than the gap of the seal material 6, and the edge of the external circuit board 9 is larger than the end portion of the seal material 6. By setting the portions at intervals of 1 to 2 mm, the sealing material 6 is prevented from peeling off from the upper and lower substrates 1 and 2.

Such a configuration is an external circuit board, which is a flexible printed circuit board thicker than the gap between the sealing materials, as a configuration of the electrode extraction portion of the liquid crystal display element, which is adhered between two upper and lower substrates using a heat seal connector, Although it has the advantage that the upper and lower substrates can be of the same shape without adversely affecting the liquid crystal part, the inner surfaces of the upper and lower substrates of the hollow chamber between the sealing material and the end of the external circuit substrate A short circuit may occur between the upper transparent electrode and the lower transparent electrode due to the pressing force from the outside or due to the deformation of the polymer film due to the change in ambient temperature and humidity.

[Purpose of device]

The present invention relates to a liquid crystal device in which upper and lower substrates made of a polymer film as described above are extended to form a connecting electrode portion with an external circuit board, and a hollow chamber portion between a sealing material and the external circuit board is formed. It is an object of the present invention to provide a means capable of preventing electrical conduction between upper and lower transparent electrodes.

[Constitution of device]

In order to achieve the above object, the present invention comprises upper and lower substrates made of a polymer film, extends the upper and lower substrates from a seal portion, and inserts and fixes an external circuit board between the upper and lower substrates to form a connecting electrode portion. In the liquid crystal element formed as described above, a spacer is arranged in the hollow chamber portion between the seal portion and the external electrode substrate.

Embodiments of the present invention will be described below with reference to the drawings.

The liquid crystal display element A is a top and bottom substrate made of a polymer film 1,
The upper transparent electrode 3 and the lower transparent electrode 4 are formed on the opposing surfaces of the upper and lower substrates 1 and 2, respectively.
The liquid crystal 5 is introduced between the gaps of 2 to several μm to several tens of μm and sealed with the sealing material 6.

In this liquid crystal display element A, the upper and lower substrates 1, 2 are extended to form an upper electrode lead-out portion 7 and a lower electrode lead-out portion 8, and the upper and lower substrates 1, 2 are provided between these electrode lead-out portions 7, 8. Thickness (about 0.1 mm)
A thicker external circuit board 9 (thickness: about 0.1 mm to 0.2 mm) is thermocompression bonded by the heat seal connectors 10, 10.

11 is an elongated space formed between the sealing material 6 and the end of the external circuit board 9, 12 is a spacer as a non-conductive material, 13 is a gap material, and 14 and 15 are upper external electrodes of the external circuit board 9. And lower external electrodes 16 and 17 are alignment layers formed on the upper transparent electrode 3 and the lower transparent electrode 4 in the liquid crystal display section.

In the present invention, as shown in FIG.
In order to prevent the short circuit of the transparent electrodes 3 and 4 in the elongated space chamber 11 formed between the end portion of the external circuit board 9 joined by the sheet seal connectors 10 and 10. A non-conductive material 12 made of plastic, paper, glass or the like is inserted as a spacer. As shown in the figure, the size of the non-conductive material 12 is such that the upper transparent electrode 3 and the lower transparent electrode 4 can be in constant contact with each other, or the size of the upper and lower transparent electrodes 3 and 4 is small. The size of the spacer is not particularly limited as long as it can prevent contact between the upper transparent electrode 3 and the lower transparent electrode 4 when the upper and lower substrates are deformed, that is, the spacer is not particularly limited. .

In FIG. 2, a gap material 13 provided in the liquid crystal 5 is dispersed as spacers for the elongated space chamber 11 on the inner surfaces of the transparent electrodes 3 and 4 of the upper and lower substrates 1 and 2 to the end position of the external circuit substrate 9. The gap material 13 located on the transparent electrodes 3 and 4 of the upper and lower substrates 1 and 2 located in the space chamber 11 is short-circuited between the transparent electrodes 3 and 4 due to the deformation of the upper and lower substrates 1 and 2. Can be prevented. The heat seal connector 10, 1 is provided between the upper external electrode 14 and the lower external electrode 15 of the external circuit board 9 and the upper transparent electrode 3 of the upper substrate 1 and the lower transparent electrode 4 of the lower substrate 2, respectively.
By arranging 0 and thermocompression bonding, the upper and lower electrodes 14 and 15 of the external circuit board 9 are connected to the transparent electrodes 3 and 4 of the upper and lower boards 1 and 2. In this case, the heat-seal connector 10 composed of the binder and the conductive particles conducts electricity when the conductive particles are positioned between the two electrodes, and the gap member 13 made of the non-conductive material is the heat-seal connector. 10,10
It is desirable to mask the upper transparent electrode 3 and the lower transparent electrode 4 located at the positions corresponding to the electrode lead-out portions 7 and 8 in order to prevent the electrode lead-out portions 7 and 8 that are bonded to each other from being scattered.

Further, by making the diameter of the conductive particles in the heat seal connectors 10, 10 larger than the diameter of the cap material 13 scattered on the transparent electrodes 3, 4 of the upper and lower substrates 1, 2, as shown in FIG. In addition, the heat seal connectors 10 and 10 are
Without being affected by the presence of 3, the upper two electrodes 3, 14 by the conductive particles 10a larger than the diameter of the gap material 13
And between the two lower electrodes 4 and 15 are electrically connected. Therefore, by selecting the diameter of the conductive particles 10a of the heat seal connector 10 to be larger than the diameter of the gap material 13, the upper and lower substrates 1 and 2 of the upper and lower substrates 1 and 2 are not required to be masked as in the case of FIG. The gap material 13 can be sprinkled on the respective transparent electrodes 3 and 4. In such a method, the gap material can be scattered on the transparent electrodes of the upper and lower substrates without increasing the number of steps in the cell manufacturing process, and the elongated hollow chamber between the seal portion and the external circuit board can be formed. The gap material in can prevent short circuit between the upper and lower transparent electrodes of the hollow chamber, and the gap material located above and below the external circuit board does not affect the function of the conductive particles of the heat seal connector, It can be located in between.

The elongated hollow chamber formed between the seal portion and the external circuit board has a structure in which the spacers are arranged as described above, so that even if the upper and lower substrates are deformed or other displacements are caused, It prevents access and does not short the transparent electrode.

[Effect of device]

According to the configuration of the present invention, in the liquid crystal display device in which the upper and lower substrates made of the polymer film are extended to form the connection electrode part with the external circuit board, the seal part and the external circuit board are provided to help secure the seal part. A liquid crystal display element which has an effect of surely preventing a short circuit between the hollow chamber and the liquid crystal display element with improved reliability without using a gap material as a spacer and increasing the number of manufacturing steps. It has an advantage that can be manufactured and provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the liquid crystal display device of the present invention, FIG. 2 is a sectional view showing another embodiment of the liquid crystal display device of the present invention, and FIG. 3 is a modification of FIG. The sectional view shown in FIG. 4 is a sectional view of a liquid crystal display element which is a premise of the present invention. 1 ... Upper substrate, 2 ... Lower substrate, 6 ... Sealing material, 9 ...
External circuit board, 11 ... space room, 12 ... spacer non-conductive material), 13 ... spacer (gap material).

Claims (2)

[Scope of utility model registration request] 1. A liquid crystal display device in which upper and lower substrates are made of a polymer film, and the upper and lower substrates are extended from a seal portion and an external circuit board is inserted and fixed to form a connecting electrode portion. A liquid crystal display element, characterized in that a non-conductive spacer is arranged in a hollow chamber portion between and. 2. The liquid crystal display device according to claim 1, wherein a gap material is used as the spacer.