Touch panel and its driving method
A touch panel and driving method technology, applied in the direction of instruments, electrical digital data processing, input/output process of data processing, etc., can solve the problems of increasing the number of components, increasing the weight or price of electronic equipment, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0037] In this embodiment, a touch panel will be described.
[0038] figure 1 An example of the structure of a touch panel is shown. exist figure 1 Among them, a touch panel 100 includes a pixel circuit 101 , a display element control circuit 102 and a light sensor control circuit 103 .
[0039] The pixel circuit 101 includes a plurality of pixels 104 arranged in a matrix of rows and columns. Each pixel 104 includes a display element 105 and a light sensor 106 .
[0040] Each display element 105 includes a thin film transistor (TFT), a storage capacitor, a liquid crystal element having a liquid crystal layer, a color filter, and the like. In addition, image display is realized by utilizing the phenomenon that the polarization direction is changed by applying a voltage to the liquid crystal layer to form brightness (gradation) of light transmitted through the liquid crystal layer. As the light transmitted through the liquid crystal layer, external light or light emitted fr...
Embodiment 2
[0069] In Example 1 of figure 2 , the photosensor reading circuit 109 on the signal line side outputs the signals that have been converted in the first to ninth A / D conversion circuits 201 to 209 from the output signal line 220 .
[0070] Here, the signals obtained by A / D conversion are not output simultaneously but are preferably sequentially output from the output signal line 220 in chronological order. This is because if signals are simultaneously output from the output signal lines 220, the number of signal lines 220 increases, and the signal becomes extremely complicated when the signal is extracted from the touch panel.
[0071] Therefore, in this embodiment, the operation of the A / D conversion circuit in the case of sequentially outputting signals obtained by A / D conversion in chronological order will be described.
[0072] The signal of the output signal line 220 is output with a time difference when the signals obtained by the A / D conversion are sequentially output ...
Embodiment 3
[0082] The operation of the A / D conversion circuit shown in Embodiment 1 is controlled by respective control signals (also referred to as "timing signals") supplied to the A / D conversion circuit. As a method of supplying signals to the A / D conversion circuit, there is a method of supplying signals from an external drive circuit through timing signal lines, or a method of supplying signals from a timing signal generation circuit included in the touch panel through timing signal lines. Here, the number of timing signal lines is proportional to the number of A / D conversion circuits and proportional to the number of bits of each A / D conversion circuit.
[0083] In the case of supplying timing signals from an external circuit, a large number of timing signal lines are extracted from the touch panel. When the number of timing signal lines increases, the area for routing the timing signal lines increases, and thus the frame area increases. In addition, it is difficult to electricall...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More