Light emitting device, driving method thereof, and image forming apparatus
A technology of a light emitting device and a driving method, which is applied in the direction of lighting devices, electroluminescent light sources, light sources, etc., and can solve problems such as deviation of light emission and difficulty in uniformly forming multiple OLED elements
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no. 1 approach
[0065] figure 1 It is a perspective view showing a part of the configuration of an image forming apparatus using the light emitting device of the first embodiment. As shown in the figure, this image forming apparatus has a light emitting device 1 , a condensing lens array 15 , and a photoreceptor drum 110 . The light emitting device 1 has a plurality of light emitting elements arranged in an array of one or more columns. These light emitting elements selectively emit light according to images to be printed on recording materials such as paper. For example, an organic light emitting diode element (hereinafter referred to as an OLED element) is used as a light emitting element. The condensing lens array 15 is disposed between the light emitting device 1 and the photoreceptor drum 110 . The condensing lens array 15 includes a plurality of distributed refractive index lenses arranged in an array with their respective optical axes facing the light emitting device 10 . As the c...
no. 2 approach
[0089] Next, a light emitting device 2 according to the second embodiment will be described.
[0090] Figure 13 A plan view of the light emitting panel 400 used in the light emitting device 2 is shown. In addition, the driver circuits A1 to Am are omitted in this figure. As shown in the figure, an OLED element 10 is formed on a light emitting area AA of a light emitting panel 400, and photosensors 31 and 32 (measurement parts) are formed at both ends thereof. The photosensors 31 and 32 output measurement signals corresponding to the light quantity of incident light. The photosensors 31 and 32 of this example are composed of photodiodes, and output a current corresponding to the amount of light (light intensity) as a measurement signal.
[0091] Figure 14 A block diagram of the light emitting device 2 is shown. The light emitting device 2 is the same as the light emitting device 2 except that the control circuit 301 is used instead of the control circuit 300 and that the...
no. 3 approach
[0099] Hereinafter, an embodiment of a light emitting device suitable for correction of temperature characteristics (relationship between temperature and light emission luminance) will be further described.
[0100] Figure 17 It is a block diagram including the light-emitting device 3 of the third embodiment and its peripheral configuration. As shown in the figure, the light emitting device 3 includes m driver circuits A1 to Am, a control circuit 300 for controlling them, and a temperature sensor TS (temperature measuring unit). The temperature sensor TS is installed near the OLED element 10 , and supplies a temperature signal Ta indicating the temperature to the control circuit 300 . The driver circuits A1 to Am and the control circuit 300 are the same as those of the first embodiment. Thus each of the driver circuits has image 3 In the shown configuration, each of the processing units U1 to Un of the driver circuit has a latch / decode circuit 220, and Image 6 The curre...
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