JPS6266237A - Display unit - Google Patents

Abstract

PURPOSE:To make constant the reflecting ratio of the displaying by providing the temperature detecting part to detect the ambient temperature of the device and the microcomputer to calculate the writing time of ECD based upon the detecting temperature. CONSTITUTION:The unit is composed of an ECD element 1, an ECD driver circuit part 2, a temperature detecting part 3, a microcomputer 4 and a memory part 5. For three lines (d)-(f), the relation of the writing time of the ECD and the reflecting ratio is changed by the temperature as shown in the figure. An ambient temperature is detected, the writing time of the temperature is calculated based upon the data of a memory part 5, and at the time of an ambient temperature H1, a writing time is controlled to be T1, at the time of H2, the time is controlled to be T2 and at the time of T3, the time is controlled to be T3. Thus, the constant reflecting ratio is obtained which is not influenced by the changed of the ambient temperature, and very useful to the displaying device to use an ECD element.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a device for displaying time and various data.

BACKGROUND OF THE INVENTION Conventional display devices of this type adjust the reflectance by changing the write time to an electrochromic display (hereinafter referred to as ECD) element using variable polyurethane attached to the device.

Problems to be Solved by the Invention In the ECD element, as shown in Figure 3, there is a certain relationship between the writing time and the reflectance. Therefore, if the ambient temperature is constant, the reflectance will be constant if the writing time is determined. becomes. However, the relationship between the writing time and reflectance of the ECD element changes with the ambient temperature as shown in the three lines a, b, and c in Figure 3, so if the writing time remains constant, the ambient temperature will change. If it changes, the reflectance will change and it will become difficult to see.

For example, when the temperature decreases from H1 to H2, the reflectance of 21 in Figure 3 becomes 22, making it difficult to see (the smaller the reflectance, the easier it is to see). In order to solve the above problems, the present invention provides a display device using an ECD element with a temperature detection section that detects the ambient temperature of the device and a microcomputer that calculates the ECD writing time based on the detected temperature. It is characterized by a constant display reflectance.

Function Since the present invention has a temperature detection section as described above, based on this, the writing time to the ECD can be calculated by the CPU in order to obtain a constant reflectance. 1 is a block diagram showing an embodiment of the present invention. FIG.

In FIG. 1, 1 is an ECD element, 2 is an ECD driver circuit section, 3 is a temperature detection section, 4 is a microcomputer,
6 is a part of memory.

Figure 2 is a characteristic diagram showing the relationship between ECD writing time and reflectance, which changes depending on temperature, as shown by the three lines d, e, and f, according to this implementation. Calculate the temperature writing time based on the data in the memory part 6,
Writing time is T4 when the ambient temperature is H1, and T2 when the ambient temperature is H2.
, H3 is controlled as T3, indicating that a constant reflectance can be obtained.

Effects of the Invention As described above, the present invention provides a constant reflectance that is not affected by changes in ambient temperature, and is extremely useful for display devices using ECD elements.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a display device showing an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between writing time and reflectance of the same display device, and Fig. 3 is a graph showing the relationship between writing time and reflectance in a conventional display device. FIG. 3 is a characteristic diagram showing the relationship between reflectances. 1... ECD element, 2... Driver circuit section, 3... Temperature detection section, 4... Microcomputer, 6... Memory part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 OTt T2 T3 damage + waiting 74 (uc di

Claims (1)

[Claims] A display device using an electrochromic display element, comprising a temperature detection unit that detects an ambient temperature of the display device, and a microcomputer that calculates a writing time of the electrochromic display according to the temperature detected by the temperature detection unit. , a display device characterized by having a constant display reflectance.