Improving LCD Sensor Reliability with Patent-Based Innovations
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Summary
Problems
Liquid crystal display devices with integrated photoelectric conversion elements face challenges in reliable data reading due to differences in amplifier characteristics, leading to unstable detection results and slow data read speeds, especially when used as operation panels for high-speed touch operations.
Innovation solutions
A display device with a matrix arrangement of display elements and optical sensors, utilizing a read circuit and read signal processing means to efficiently process and transfer sense signals, and an amplifier setup that adjusts input voltage to maintain stability and enhance read speed by effectively utilizing signal lines without increasing components.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If amplifiers are constructed on the glass substrate to obtain optical sensor outputs, then the display device can process optical signals, but marked differences in characteristics between amplifiers occur leading to unreliable detection results
Why choose this principle:
A precharge circuit is introduced as an intermediary component between the optical sensors and amplifiers. This precharge circuit standardizes the input conditions for all amplifiers by precharging the gate electrodes of switching transistors to a predetermined potential, thereby eliminating the reliability issues caused by characteristic differences in amplifiers while preserving the optical signal processing capability
Principle concept:
If data is read from photoelectric conversion elements at high speed for touch operations, then touch operation responsiveness is improved, but the existing read circuit architecture cannot support sufficiently high read speeds
Why choose this principle:
The read circuit is segmented into multiple independent readout paths, each capable of reading data from multiple optical sensors in parallel. This segmentation allows simultaneous reading of multiple sensor outputs, thereby achieving high-speed data acquisition necessary for responsive touch operations
Application Domain
Data Source
AI summary:
A display device with a matrix arrangement of display elements and optical sensors, utilizing a read circuit and read signal processing means to efficiently process and transfer sense signals, and an amplifier setup that adjusts input voltage to maintain stability and enhance read speed by effectively utilizing signal lines without increasing components.
Abstract
An input sensor containing a display device including a group of pixel circuits arranged in a matrix, a group of optical sensor circuits arranged in a matrix, a display driving circuit which provides a display signal to the display element group and which provides a driving signal to the display element group, a read circuit which identifies an optical sensor to read a sense signal from this optical sensor, and a read signal processing section which processes the sense signal output by the read circuit in accordance with a command. The read signal processing section has an interface section which transfers, when the command requesting execution of an application is set to the interface section, the command to a command register.