Display Device With Light-Sensing Pixels for Flicker-Aware Touch
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Solution Overview
Problem
Display devices experience flicker issues that affect touch sensitivity and accuracy, particularly in environments with high-frequency image changes, which existing technologies fail to adequately address.
Innovation Solution
Incorporation of light-sensing pixels in the display area to detect flicker and adjust the driving mode of the touch sensing module based on flicker detection results, using a flicker detection circuit to analyze light-sensing signals and adjust the frame driving frequency and voltage levels accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensing module operates at high driving frequency to improve touch detection speed and responsiveness, then touch sensitivity is improved, but flicker occurs in the displayed image
Solution Approach 1:
The patent implements dynamic adjustment of the touch sensing module's driving frequency based on real-time flicker detection. The system transitions from a static operating mode to a dynamic one where the driving frequency is continuously adapted according to the detected flicker level, resolving the contradiction between maintaining high touch sensitivity and preventing display flicker.
Solution Approach 2:
The patent introduces a feedback mechanism where the flicker detection circuit monitors the display output and provides information to the main driving circuit, which then adjusts the touch sensing module's driving parameters. This closed-loop feedback system enables the system to automatically balance touch sensitivity and flicker prevention based on actual display conditions.
2Measurement precision
If the touch sensing module operates at high voltage to improve signal detection capability, then touch sensitivity is improved, but power consumption increases and flicker is exacerbated
Solution Approach 1:
The patent dynamically adjusts the driving voltage of the touch sensing module based on detected flicker levels and touch detection requirements. Instead of operating at constantly high voltage, the system adapts voltage levels in real-time, maintaining adequate touch detection capability while reducing power consumption and minimizing flicker when high voltage is not necessary.
Solution Approach 2:
The patent changes the operating parameters (voltage and frequency) of the touch sensing module based on detected conditions. The main driving circuit modifies these parameters dynamically to optimize the balance between touch detection capability, power consumption, and flicker prevention, rather than using fixed high-parameter settings.
3Speed
If the frame driving frequency is increased to improve image refresh rate, then display responsiveness is improved, but flicker detection accuracy deteriorates
Solution Approach 1:
The patent introduces light-sensing pixels as intermediary elements that specifically detect optical fluctuations causing flicker. These dedicated sensing elements act as mediators between the display output and the control system, providing accurate flicker detection information even at high frame rates where conventional detection methods would fail.
Solution Approach 2:
The patent segments the display pixel function into display capability and light sensing capability. By incorporating dedicated light-sensing pixels within the display area, the system can simultaneously maintain high frame driving frequency for responsive display while having specialized elements dedicated to accurate flicker detection, separating these two functions at the pixel level.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances touch sensitivity and accuracy by preventing or reducing the impact of flicker on touch detection, maintaining optimal performance by dynamically adjusting the touch sensing module's driving mode in response to flicker occurrences.
Implementation Method 1
light-sensing pixels alternately arranged with the display pixels in the display area, a flicker detection circuit detecting the occurrence of flicker in the display area by using light-sensing signals received from the light-sensing pixels
Data Source
AI summary
A display device includes: display pixels in a display area of a display panel; light-sensing pixels alternately arranged with the display pixels in the display area; a display scan driver configured to sequentially provide display scan signals to the display pixels through display scan lines; a flicker detection circuit configured to detect an occurrence of flicker in the display area by using light-sensing signals received from the light-sensing pixels; a touch sensing circuit configured to detect a touch from a user and coordinate data of a location of the touch via touch electrodes of a touch sensor; and a main driving circuit configured to maintain or change a driving mode of the touch sensor in units of at least one frame based on a flicker detection result and a flicker degree analysis result from the flicker detection circuit.